Baxi
Инструкция Baxi Instruction Baxi 200 Combi 2 installation manual
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These instructions include the Benchmark Commissioning Checklist and should be left with the user for safe keeping.They must be read in conjunction with the Flue Installation Guide. United Kingdom en Installation and Service Manual High-efficiency wall-hung condensing gas boiler 224 Combi 2 - 228 Combi 2 224 Combi 2 LPG
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Dear Customer, Thank you very much for buying this appliance. Please read through the manual carefully before using the product, and keep it in a safe place for later reference. In order to ensure continued safe and efficient operation we recommend that the product is serviced regularly. Our service and customer service organisation can assist with this. We hope you enjoy years of problem-free operation with the product.
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Contents 1 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 1.2 General safety instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 1.3 Recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 1.5 Liabilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 1.5.1 Manufacturer's liability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 1.5.2 Installer's liability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10 1.5.3 User's liability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 2 About this manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 2.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 2.3 Symbols used . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 2.3.1 Symbols used in the manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 3 Technical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 3.1 Homologations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12 3.1.1 Safety, performance & quality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 3.1.3 Gas category . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 3.2 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13 3.2.2 Features of the temperature sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16 3.3 Dimensions and connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 3.4 Electrical diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 4 Description of the product . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 4.1 General description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19 4.2 Operating principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 4.2.1 Air-gas adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19 4.2.2 Combustion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 4.2.3 Heating and domestic hot water production . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 4.2.4 Schematic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 4.3 MAIN COMPONENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 4.4 Control panel description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 4.4.1 Description of the control panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 4.5 Contents of the package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 4.6 Accessories & options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21 5 Before installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 5.1 Installation standards and rules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 5.2 Installation requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22 5.2.1 Gas supply. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 5.2.2 Electrical supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 5.3 Flow rate/head at the plate characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Contents 3 2.4 Abbreviations/glossary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 1.1 Benchmark . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 1.1.1 Building regulations and the benchmark commissioning checklist. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 1.1.2 The benchmark scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 1.1.3 Installer notification guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 1.4 Specific safety instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 1.4.1 Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 3.1.2 Certifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 3.1.4 Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 5.2.3 Hard water area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23 5.2.4 Bypass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 5.2.5 System control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 5.2.6 Treatment of water circulating systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 5.2.7 Showers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 5.2.8 Expansion vessel (CH only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 5.2.9 Safety pressure relief valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 3.2.1 Technical information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13 2.2 Additional documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Combi 2
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6.6 Draining the installation . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 7 Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 7.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 7.2 Checklist before commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 7.3 Commissioning procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 7.4 Gas settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 7.4.1 Check the operational (working gas inlet pressure and gas rate). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 7.4.2 Combustion parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 7.4.3 Service settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 7.5 Final instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 8 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 8.1 Use of the control panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 Contents 4 6 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37 6.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 6.2 Assembly . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 6.2.1 Fitting the pressure relief discharge pipe. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 6.2.2 Connecting the condensate drain . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38 6.3 Air supply/flue gas connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 6.3.1 Connecting the flue/chimney . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 6.4 Electrical connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 6.5 Filling the installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42 6.5.1 Flushing the system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 6.5.2 Fill the installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 6.5.3 Filling the condensate trap. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 5.4 Choice of the location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 5.4.1 Location of the boiler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 5.6.1 Unpacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 5.5 Transport . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33 5.4.2 Bath and shower rooms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26 5.4.3 Ventilation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 5.4.4 Condensate drain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 5.4.5 Clearances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 5.4.6 Flue/chimney location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 5.4.7 Horizontal flue/chimney systems. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 5.4.8 Flue/chimney trim . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 5.4.9 Terminal guard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 5.4.10 Flue/chimney deflector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 5.4.11 Flue/chimney accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 5.6 Unpacking and initial preparation . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34 5.6.2 Initial preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35 6.4.1 Accessing the electrical connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40 6.4.2 Connecting the room thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40 6.4.3 Service connection (SERVICE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41 6.4.4 Connecting on wall outdoor sensor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 6.4.5 Connecting the outside sensor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41 6.4.6 Identifying label . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 7.4.4 Calibrating the gas valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 7.5.1 Handover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 8.1.1 Browsing the menus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 8.1.2 Running the automatic detection function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 8.1.3 Information menu display. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50 5.4.12 Data plate and boiler service level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 5.7.1 Filling information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 5.7 Connecting diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35 5.7.2 Domestic hot water circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36 Combi 2 8.1.4 Counter menu display. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50
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12.2 Recommissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77 13 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .78 13.1 Disposal and recycling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78 Contents 5 10 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .62 10.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62 10.2 Maintenance message . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 10.2.1 Service notification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 10.2.3 Resetting the upcoming maintenance message . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64 10.3 Periodic check and maintenance procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .65 10.3.1 Checking the water pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .66 10.3.2 Checking the expansion vessel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66 10.3.3 Checking the flue gas discharge and the air supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66 10.3.4 Checking the combustion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66 10.3.5 Checking the automatic air vent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66 10.3.6 Cleaning the siphon . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .66 10.3.7 Checking the burner and cleaning the heat exchanger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67 10.3.8 Electrode distances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68 10.3.9 Water unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68 10.3.10 Removing limescale . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .69 10.4 Specific maintenance operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 10.4.1 Detection/ignition electrode replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .70 10.4.2 Dismantling the water-water exchanger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .70 10.4.3 Replacing the 3-way valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .70 10.4.5 Replacing the expansion vessel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71 11 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72 11.1 Temporary and permanent faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72 11.2 Error codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72 12 Decommissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .77 12.1 Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77 10.4.6 Replacing the PCB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71 9 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 9.1 Accessing the settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 9.2 List of parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53 9.3 Setting the parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 9.3.1 Setting the heating curve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57 8.3 Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 8.4 Degassing function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 8.5 Frost protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 8.3.1 Switching off the heating and domestic hot water (DHW) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 9.4 Reading out measured values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 9.5 Reading meters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .61 10.2.2 Resetting the displayed maintenance message . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64 8.2 Start-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 8.2.1 Procedure for first start-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 8.2.2 Changing the heating flow temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 8.2.3 Changing the domestic hot water (DHW) temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 9.2.1 Resetting factory settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57 10.4.4 Pump motor replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71 Combi 2 9.4.1 Statuses and sub-statuses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .59
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1 Safety 1.1 Benchmark 1.1.1 Building Regulations and the Benchmark Commissioning Checklist Building Regulations (England & Wales) require notification of the installa tion of a heating appliance to the relevant Local Authority Building Control Department. This can be achieved via a Competent Persons Self Certifica tion Scheme as an option to notifying the Local Authority directly. The Health & Safety Executive operates the ’Gas Safe Register’, a selfcer tification scheme for gas heating appliances. This company is a member of the Benchmark initiative and fully supports the aims of the programme. Its aim is to improve the standards of installa tion and commissioning of central heating systems in the UK and to en courage the regular servicing of all central heating systems to ensure safe ty and efficiency. Building Regulations require that installations should comply with manu facturer’s instructions. It is therefore important that the commissioning checklist is completed by the installer. The relevant section of Building Regulations only relates to dwellings. Therefore the checklist only applies if the appliance is being installed in a dwelling or some related structure. The flowchart opposite gives guidance for installers on the process neces sary to ensure compliance with Building Regulations. 1.1.2 The Benchmark Scheme Benchmark places responsibilities on both manufacturers and installers. The purpose is to ensure that customers are provided with the correct equipment for their needs, that it is installed, commissioned and serviced in accordance with the manufacturer’s instructions by competent persons and that it meets the requirements of the appropriate Building Regulations. The Benchmark Checklist can be used to demonstrate compliance with Building Regulations and should be provided to the customer for future ref erence. Installers are required to carry out installation, commissioning and servic ing work in accordance with the Benchmark Code of Practice which is available from the Heating and Hotwater Industry Council who manage and promote the Scheme. Visit www.centralheating.co.uk for more infor mation. Fig.1 Benchmark AD-3000725-01 1 Safety 6 Combi 2
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1.1.3 Installer Notification Guidelines Fig.2 Installer Notification Guidelines AD-3000696-01 Choose Building Regulations Notification Route Contact your relevant Local Authority Building Control (LABC) who will arrange an inspection or contact a government approved inspector LABC will record the data and will issue a certificate of compliance ‘Gas Safe Register’ will issue a Building Regulations Compliance Certificate to the property owner and inform the relevant LABC You must ensure that the certificate number issued by the ‘Gas Safe Register’ is written onto the Benchmark Checklist Scheme Members only Call ‘Gas Safe Register’ on: 0800 408 5577 or log onto: www.gassaferegister.co.uk within 10 days If you notify via the ‘Gas Safe Register’, the register will issue the Building Regulations certificate on members’ behalf Complete the Benchmark Checklist Install and Commission this appliance to manufacturer's instructions Competent Person's Self Certification Scheme Building Control Complete the Benchmark Checklist Install and Commission this appliance to manufacturer's instructions 1 Safety 7 Combi 2
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1.2 General safety instructions Danger This boiler can be used by children aged 8 years and above and by persons with reduced physical, sensory or mental capabilities or lack of experience and knowledge when they have been given supervision or instruction concerning the safe use of the device and understand the resulting risks. Children must not be allowed to play with the appliance. Cleaning and user maintenance must not be carried out by children without supervision. Danger If you smell gas: 1. Do not use a naked flame, do not smoke, do not operate elec trical contacts or switches (doorbell, light, motor, lift, etc.). 2. Shut off gas supply. 3. Open the windows. 4. Trace possible leaks and seal them immediately. 5. If the gas leak is before the gas meter, contact the supplier 6. Telephone the National Gas Emergency Service on:- 0800 111 999. Danger If you smell flue gases: 1. Switch off the boiler. 2. Open the windows. 3. Trace possible leaks and seal them immediately. Warning Do not touch the flue gas pipes. Depending on the boiler settings, the temperature of the flue gas pipes may exceed 60oC. Warning Do not touch the radiators for long periods. Depending on the boil er settings, the temperature of the radiators may exceed 60oC. Warning Take precautions with the domestic hot water. Depending on the boiler settings, the domestic hot water temperature may exceed 65oC. Danger Before any work, switch off the mains supply to the boiler. Caution After maintenance or repair work, check the entire heating installa tion to ensure that there are no leaks. 1.3 Recommendations Warning Installation and maintenance of the boiler must be carried out by a qualified installer in accordance with local and national regula tions. Warning If the mains lead is damaged, it must be replaced by the original manufacturer, the manufacturer's dealer or another suitably skilled person to prevent hazardous situations from arising. Warning Always disconnect the mains supply and close the main gas tap when working on the boiler. 1 Safety 8 Combi 2
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Caution Make sure the boiler can be reached at all times. The boiler must be installed in a frost-free area. In the case of a fixed connection to the power cord, you must al ways install a main double pole switch with an opening gap of at least 3 mm (EN 60335-1). Drain the boiler and central heating system if you are not going to use your home for a long time and there is a chance of frost. The frost protection does not work if the boiler is out of opera tion. The boiler protection only protects the boiler, not the system. Check the water pressure in the system regularly. If the water pressure is lower than 0.8 bar, the system must be topped up (recommended water pressure between 1 and 2 bar). Important Keep this document near to the boiler. Important Casing panels may only be removed for maintenance and servic ing purposes. Refit all panels when maintenance work and servic ing are complete. Note Instruction and warning labels must never be removed or covered and must be clearly legible throughout the entire service life of the boiler. Replace damaged or illegible instruction and warning labels immediately. Note The boiler must not be modified in any way. 1.4 Specific safety instructions 1.4.1 Handling General The following advice should be adhered to, from when first handling the boiler to the final stages of installation, and also during maintenance. Most injuries as a result of inappropriate handling and lifting are to the back, but all other parts of the body are vulnerable, particularly should ers, arms and hands. Health & Safety is the responsibility of EVERY ONE. There is no "safe" limit for one man - each person has different capabili ties. The boiler should be handled and lifted by TWO PEOPLE. Do not handle or lift unless you feel physically able. Wear appropriate Personal Protection Equipment e.g. protective gloves, safety footwear etc. Preparation Co-ordinate movements - know where, and when, you are both going. Minimise the number of times needed to move the boiler - plan ahead. Always ensure when handling or lifting the route is clear and unobstruc ted. If possible avoid steps, wet or slippery surfaces, unlit areas etc. and take special care on ladders/into lofts. Technique When handling or lifting always use safe techniques - keep your back straight, bend your knees. Don’t twist - move your feet, avoid bending forwards and sideways and keep the load as close to your body as pos sible. Where possible transport the boiler using a sack truck or other suitable trolley. 1 Safety 9 Combi 2
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Always grip the boiler firmly, and before lifting feel where the weight is concentrated to establish the centre of gravity, repositioning yourself as necessary. See the "Installation" section of these instructions for recom mended lift points. Remember The circumstances of each installation are different. Always assess the risks associated with handling and lifting according to the individual con ditions. If at any time when installing the boiler you feel that you may have in jured yourself STOP !! DO NOT "work through" the pain - you may cause further injury. IF IN ANY DOUBT DO NO HANDLE OR LIFT THE BOILER — OBTAIN ADVICE OR ASSISTANCE BEFORE PROCEEDING ! 1.5 Liabilities 1.5.1 Manufacturers liability Our products are manufactured in compliance with the requirements of the various Directives applicable. They are therefore delivered with the marking and any documents necessary. In the interests of the quality of our products, we strive constantly to improve them. We therefore reserve the right to modify the specifications given in this document. Our liability as manufacturer may not be invoked in the following cases: Failure to abide by the instructions on installing the appliance. Failure to abide by the instructions on using the appliance. Faulty or insufficient maintenance of the appliance. 1.5.2 Installers liability The installer is responsible for the installation and initial commissioning of the appliance. The installer must observe the following instructions: Read and follow the instructions given in the manuals provided with the appliance. Install the appliance in compliance with prevailing legislation and stand ards. Carry out initial commissioning and any checks necessary. Explain the installation to the user. If maintenance is necessary, warn the user of the obligation to check the appliance and keep it in good working order. Give all the instruction manuals to the user. 1.5.3 Users liability To guarantee optimum operation of the system, you must abide by the fol lowing instructions: Read and follow the instructions given in the manuals provided with the appliance. Call on a qualified professional to carry out installation and initial com missioning. Get your installer to explain your installation to you. Have the required inspections and maintenance carried out by a quali fied installer. Keep the instruction manuals in good condition close to the appliance. 1 Safety 10 Combi 2
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This manual is intended for installers of Baxi Combi 2 boilers 2.3 Symbols used 2.3.1 Symbols used in the manual This manual uses various danger levels to draw attention to special instructions. We do this to improve user safety, to prevent problems and to guarantee correct operation of the appliance. Danger Risk of dangerous situations that may result in serious personal injury. Danger of electric shock Risk of electric shock. Warning Risk of dangerous situations that may result in minor personal injury. Caution Risk of material damage. Important Please note: important information. See Reference to other manuals or pages in this manual. 2 About this manual 2.1 General 11 2.4 Abbreviations/Glossary BS CH DHW GB British Standard Central heating Domestic hot water Great Britain HHIC Heating and Hotwater Industry Council Hi Hs IE PCU Pn Pnc SU Lower heating value (LHV) Higher heating value (HHV) Ireland PCB for managing burner operation Nominal output Condensing output Safety PCB 2 About this manual 2.2 Additional documentation These Installation & Service Instructions must be read in conjunction with the Flue Accessories Fitting Guide supplied in the Literature Pack. Various timers, external controls, etc. are available as optional extras. Full details are contained in the relevant sales literature. Combi 2
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3 Technical specifications 3.1 Homologations 3.1.2 Certifications Tab.1 Certifications CE certificate number 0085CU0338 NOx class 6 Boiler type C13, C33 3.1.3 Gas category Gas category Gas type Supply pressure (mbar) I2H G20 (H natural gas) 20 3 Technical specifications 12 3.1.4 Standards Codes of Practice — refer to the most recent version Tab.3 In GB the following Codes of Practice apply: 3.1.1 Safety, Performance & Quality This boiler has been assessed by an appropriate Notified Body and shown to meet the requirements of all Directives and Regulations as applicable. These Directives and Regulations lay down requirements for the safety and efficiency of the appliance, together with its design, construction and use of materials. They also require the production process to be covered by an approved and monitored system of quality assurance. Standard Scope BS 6891 Gas Installation. BS 5546 Installation of hot water supplies for domestic purposes. BS EN 12828 Heating systems in buildings. BS EN 12831 Heating systems in buildings — Calculation of load. BS EN 14336 Installation & commissioning of water based heating sys tems. BS 6798 Installation of gas fired hot water boilers. BS 5440 Part 1 Flues. BS 5440 Part 2 Ventilation. Tab.2 Gas category, type and supply pressure Important This appliance is suitable for G20 gas containing up to 20% hydrogen (H2). Due to variations in the percentage of H2, the percentage of O2 may vary over time. (For example: 20% of H2 in the gas may lead to a 1.5% increase of O2 in the flue gases) The gas valve may need to be adjusted more accurately. This must be adjusted using standard O2 values for the gas used. Combi 2 II2H3P L.P.G 37
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3 Technical specifications 13 Tab.4 In IE the following Code of Practice apply: Standard Scope IS 813 Domestic Gas Installations. The following standards give valuable additional information: BS 5546 Installation of hot water supplies for domestic purposes. BS EN 12828 Heating systems in buildings. BS EN 12831 Heating systems in buildings — Calculation of load. BS EN 14336 Installation & commissioning of water based heating sys tems. BS 7074 Expansion vessels and ancillary equipment for sealed wa ter systems. BS 7593 Treatment of water in domestic hot water central heating systems. Cogeneration space heater No No 3.2 Technical data Tab.5 Technical settings for combination heaters with boilers Baxi - Combi (C) 224 Combi 2 228 Combi 2 Condensing boiler Yes Yes Low-temperature boiler(1) No No B1 boiler No No 3.2.1 Technical information Important All data in these sections are nominal and subject to normal pro duction tolerances. Combination heater Yes Yes Rated heat output Prated kW 20 20 Useful heat output at rated heat output and high temperature setting (2) P4 kW 20 20 Useful heat output at 30% of rated heat out put and low temperature setting(1) P1 kW Seasonal space heating energy efficiency ƞs % Useful efficiency at rated heat output and high temperature setting(2) ƞ4 % Useful efficiency at 30% of rated heat output and low temperature setting(1) ƞ1 % 6.7 93 88.2 97.9 6.7 93 88 97.8 BS 7074 Expansion vessels and ancillary equipment for sealed wa ter systems. BS 7593 Treatment of water in domestic hot water central heating systems. BS 4814 Specification for Expansion Vessels using an internal dia phragm, for sealed hot water systems. IGE/UP/ 7/1998 Guide for gas installations in timber framed housing. Standard Scope Combi 2
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Auxiliary electricity consumption Full load elmax kW Partial load elmin kW Standby mode PSB kW Other items Heat loss on standby Pstby kW Ignition burner power consumption Pign kW Annual energy consumption QHE GJ Sound power level, indoors LWA dB Nitrogen oxide emissions NOx mg/kWh Domestic hot water parameters Declared load profile Daily electricity consumption Qelec kWh Annual electricity consumption AEC kWh Water heating energy efficiency ƞwh % Daily fuel consumption Qfuel kWh Annual fuel consumption AFC GJ (1) Low temperature means for condensing boilers 30°C, for low temperature boilers 37°C and for other heaters 50°C return temperature (at heater inlet). (2) High temperature setting means 60 °C return temperature at boiler inlet and 80 °C flow temperature at boiler outlet Tab.6 General 224 Combi 2 228 Combi 2 Rated heat input (Qn) for domestic hot water kW 24.7 28.9 Rated heat input (Qn) with domestic hot water tank kW - – Rated heat input (Qn) for heating kW 20.6 20.6 Reduced heat input (Qn) 80/60 °C kW 4.9 6.0 Rated heat output (Pn) for domestic hot water kW 24 28.0 Rated heat output (Pn) with domestic hot water tank kW - – Rated heat output (Pn) 80/60 °C for heating kW 20 20 Rated heat output (Pn) 50/30 °C for heating kW 21.8 21.8 Reduced heat output (Pn) 80/60 °C kW 4.8 5.8 Reduced heat output (Pn) 50/30 °C kW 5.2 6.3 Rated efficiency 50/30 °C (Hi) % 105.8 105.8 3 Technical specifications 14 0.004 0.037 0.014 0.04 - 62 50 23 XL 0.176 39 88 22.03 17 0.026 0.014 0.004 0.04 - 62 49 21 XL 0.185 41 85 22.72 17 Baxi - Combi (C) 224 Combi 2 228 Combi 2 Combi 2
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Tab.7 Characteristics of the heating circuit 224 Combi 2 228 Combi 2 Maximum pressure bar 2.5 2.5 Minimum pressure bar 0.5 0.5 Temperature range for heating circuit °C 25 - 80 25 - 80 Water capacity of expansion vessel l 7 7 Tab.8 Characteristics of the domestic water circuit 224 Combi 2 228 Combi 2 Minimum pressure bar 0.8 0.8 Maximum pressure bar 8.0 8.0 Minimum dynamic pressure bar 0.15 0.15 Minimum water flow l/min 2.0 2.0 Specific flow (D) l/min 11.1 13.4 Temperature range for domestic water circuit °C 35 - 60 35 - 60 Domestic water production with ΔT = 25 °C l/min 13.8 16.0 Domestic water production with ΔT = 35 °C l/min 9.8 11.4 Tab.9 Combustion characteristics 224 Combi 2 228 Combi 2 G20 gas consumption (Qmax) m3/h 2.61 3.06 G20 gas consumption (Qmax) with domestic hot water tank m3/h – – G20 gas consumption (Qmin) m3/h 0.52 0.63 Diameter of separate discharge pipes mm 80/80 80/80 Diameter of coaxial discharge pipes mm 60/100 60/100 Flue gas mass flow rate (max) kg/sec 0.011 0.013 Flue gas mass flow rate (max) with domestic hot water tank kg/sec – – Flue gas mass flow rate (min) kg/sec 0.002 0.003 Tab.10 Electrical characteristics 224 Combi 2 228 Combi 2 Power supply voltage V 230 230 Power supply frequency Hz 50 50 Rated electric power W 90 85 Rated electrical output with domestic hot water tank W – – Tab.11 Other characteristics 224 Combi 2 228 Combi 2 Humidity protection rating (EN 60529) IP X5D X5D Net weight when empty/filled with water kg 26.5/28.5 27.5/29.5 Dimensions (height/width/depth) mm 700/395/285 700/395/285 3 Technical specifications 15 Combi 2 G31 propane gas consumption (Qmax) kg/h 1.92 2.24 G31 propane gas consumption (Qmin) kg/h 0.38 0.47
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Tab.14 Flue gas temperature sensor (NTC20K Beta 3970 20kOhm@25°C) Temperature [°C] 0 10 20 25 30 40 50 60 70 80 90 100 Resistance [Ω] 66050 40030 25030 20000 16090 10610 7166 4943 3478 2492 1816 1344 — — — — —> 110 120 130 140 150 160 170 180 190 - - - — — — — —> 1009 768 592 461 364 290 233 189 155 - - - 3.3 Dimensions and connections Fig.3 Dimensions and connections 700 mm 285 mm 395 mm 2 5 4 BO-0000199-1 1 3 7 6 1 2 3 Safety valve Heating circuit flow fitting (G3/4”) Fitting for condensate discharge 4 DHW (Domestic Hot Water) outlet fitting (G1/2”) 5 Gas inlet fitting (G3/4”) 6 Domestic cold water inlet fitting (G1/2”) 7 Heating circuit return fitting (G34") 3 Technical specifications 16 3.2.2 Features of the temperature sensors Tab.12 Temperature sensor outdoor sensor (NTC1000 Beta 3419 1 kOhm @ 25 °C) Temperature [°C] -20 -15 -10 -5 0 5 10 15 20 25 30 Resistance [Ω] 7578 5861 4574 3600 2857 2284 1840 1492 1218 1000 827 Combi 2 Tab.13 Temperature flow/heating circuit return sensor (NTC10K Beta 3977 10KOhm@25êC) Temperature [êC] 0 10 20 25 30 40 50 60 70 80 90 Resistance [˖] 32505 19854 12483 9999 8060 5332 3608 2492 1754 1257 915
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Fig.4 Paper template 3 Technical specifications 17 Combi 2
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3.4 Electrical diagram Fig.5 Boiler electrical wiring diagram 3 Technical specifications 18 Tab.15 Electrical connections X1 Power supply: L: Live 230V – 50 Hz N: Neutral : Earthing connector X2 Fan supply (FAN) X3 Gas valve (GV) X4 Pump power supply X5 3-way valve motor power supply X6 Earth connections X7 Sensors: Limit thermostat (ST) Installation return temperature (SRT) Installation flow temperature (SFL) Flue gas temperature (FS) X8 Sensors: DHW flowmeter (HS) Heating circuit pressure switch (SP) Pump PWM signal (PWM PUMP) X9 CAN connection X10 Service interface X17 Open Therm room unit (OT) X17 Outside sensor (T/OUT) X17 External tank sensor - accessory (T/DHW) X15 Boiler stoppage (with open contact) RT Room thermostat contact (230 V) Tab.16 Cable colour key BK Black BN Brown BU Blue (and light blue) GNYE Green/Yellow GY Grey RD Red WH White YE Yellow Combi 2
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The purpose of this gas-fuelled condensing boiler is to heat water to a temperature that is lower than boiling point at atmospheric pressure. It must be connected to a heating installation and to a domestic hot water distribution system that is compatible with its power and performance ratings. Features of this boiler: Low pollutant emissions, High-efficiency heating, Combustion products discharged through a concentric connector, Front control panel with display, Lightweight and compact. 4.2 Operating principle 4.2.1 Air-gas adjustment The air is drawn in by the fan and gas injected directly at the height of the venturi. The fan revolution speed is regulated automatically by the electronic board based on the adjustment settings. The gas and air are mixed in the manifold. The gas/air ratio ensures that the quantity of gas and air are adjusted correctly to always obtain optimal combustion. The gas/air mixture is fed into the burner at the front of the exchanger. Here, the electric igniter triggers the mixture with a series of sparks that burn, producing thermal energy. 4.2.2 Combustion The burner heats the heating water circulating in the heat exchanger. When the temperature of the combustion gas is lower than the dew point (around 55 °C), the water vapour contained in the combustion gas condenses in the flue gas side of the heat exchanger. The heat recovered during this condensation process (the latent heat or condensing heat) is also transferred to the heating water. Once cooled, the combustion gases are discharged through the exhaust pipe. The condensed water is discharged through a siphon. 4.2.3 Heating and domestic hot water production In boilers used for heating and for producing domestic hot water, an integrated plate heat exchanger heats the domestic water. The heated water is then channelled to the heating installation or to the plate heat exchanger via a three-way valve. A flow sensor detects that a hot water tap has been turned on and communicates this to the PCB, which switches the three-way valve to the hot water position and activates the pump. The three-way valve is spring-loaded and only consumes electricity when switching from one position to another. Precedence is given to a heat request in domestic water mode. 4 Description of the product 4.1 General description 19 4 Description of the product Combi 2
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4.2.4 Schematic diagram 1 2 3 4 5 6 7 8 9 10 Heat exchanger (heating) Water unit Plate heat exchanger (DHW) Safety valve Heating flow DHW outlet (G1/2") DHW inlet (G1/2") Heating return Pump (heating circuit) Motorised three-way valve 4.3 MAIN COMPONENTS 1. Construction 2. Hooks for fastening the bracket to the wall 3. Flue gas tower 4. Expansion vessel air control/filling valve 5. Expansion vessel 6. Hydraulic circuit-expansion vessel connection pipe 7. Air-gas collector 8. Fan (air-gas assembly: Control board and mixer valve) 9. Heating return sensor 10. Gas valve 11. Heating system and pump venting valve 12. Pump 13. Cable gland 14. Control panel with boiler PCB and display 15. Domestic hot water plate heat exchanger fastening screws 16. Domestic hot water priority sensor 17. Domestic hot water plate heat exchanger 18. Siphon 19. Hydraulic safety valve (3 bar) 20. Hydraulic pressure gauge 21. 3-way valve 22. Air-gas silencer assembly 23. Heating circuit water flow sensor (°C) 24. Safety thermostat (limit) 25. Condensate drain pipe connection towards discharge 26. Detection/ignition electrode 27. Burner flange 28. Flue gas temperature sensor 29. Boiler earthing socket Fig.6 Schematic diagram 1 BO-0000144 3 6 7 2 M 5 8 9 4 10 Fig.7 Functional diagram 2 3 4 10 5 6 7 8 9 11 12 13 14 16 15 17 1 19 20 21 22 23 25 24 26 27 28 29 18 BO-7749665 4 Description of the product 20 Combi 2
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4.4 Control panel description 4.4.1 Description of the control panel Fig.9 Display screen 4.5 Contents of the package The boiler is delivered in a package comprising: a wall-hung gas boiler; a bracket for fastening the boiler to the wall; a flue gas fitting; a three-pole cable for connecting the power supply; a paper template; an installation and service manual; a user Guide; A condensate drain pipe; Dowel/screw kit for fastening the boiler to a wall. 4.6 Accessories & options Consult the sales catalogue for all available accessories and options. 4 Description of the product 21 Chimney sweep mode is enabled (forced full load or low load for CO2 measurement). The burner is on. Display of the system water pressure. DHW operation is enabled. CH operation is enabled. Information menu: read out various current values. User menu: user-level parameters can be configured. Installer menu: installer-level parameter can be configured. Error menu: errors can be read out. Counter menu: various counters can be read out. Knobs HEATING: Using this knob you can modify the flow temperature for the heating installation (heating setpoint 25-80 °C). turn the knob anti-clockwise to reduce the temperature or to the left to scroll through the menus. With an outside sensor connected it is possible to limit the setpoint value; turn the knob clockwise to increase the temperature or to the right to scroll through the menus. DOMESTIC HOT WATER: Using this knob you can modify the domestic hot water temperature (DHW setpoint 35÷60 °C) or scroll through the menus to the left and right: turn anti-clockwise to reduce the temperature. turn clockwise to increase the temperature. Fig.8 Control panel Buttons F1 Back (previous menu) F2 Manual reset F3 Menu F4 Confirms selection or value. 1 Chimney sweep mode: Press keys F1 and F2 simultaneously. Icons Combi 2
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5 Before installation 5.1 Installation standards and rules 5.2 Installation requirements 5 Before installation 22 5.2.1 Gas supply The gas installation should be in accordance with the relevant standards. In GB this is BS 6891 (NG). In IE this is the current edition of IS 813 Do mestic Gas Installations. The connection to the appliance is a 22mm copper tail located at the rear of the gas service cock. Ensure that the pipework from the meter to the appliance is of adequate size, and the demands of any other gas appliances in the property are tak en into consideration. Do not use pipes of a smaller diameter than the boil er gas connection (22mm) UNLESS the stated gas rate can be achieved with pipe of lesser diameter and with all other gas appliances operating at maximum rate. 5.2.2 Electrical supply External wiring must be correctly earthed, polarised and in accordance with relevant regulations/rules. In GB this is the current IEE Wiring Regula tions. In IE reference should be made to the current edition of ETCI rules. The mains supply is 230V ~ 50Hz fused at 3A. Important The method of connection to the electricity supply must facilitate complete electrical isolation of the appliance. Connection may be via a fused double-pole isolator with a contact separation of at least 3mm in all poles and servicing the boiler and system controls only. The boiler must be connected to the mains fused 3A 230V 50HZ supply & control system using cable of 3 core 0.75mm 3183Y multi strand flexible type. Warning Installation, repair and maintenance must only be carried out by a competent person. This document is intended for use by compe tent persons. Installation must be carried out in accordance with the prevailing regula tions, the code of practice and the recommendations in these instructions. Installation must also respect the following points: This instruction manual and any other applicable documentation Building Regulations British Standards Gas Safety Regulations Water Supply Regulations Combi 2
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5.2.3 Hard water area Important Only water that has NOT been artificially softened must be used when filling or re-pressurising the primary system. If the mains cold water to the property is fitted with an artificial softening/treat ment device the source utilised to fill or re-pressurise the system must be upstream of such a device. 5.2.4 Bypass The boiler utilises the primary side of the DHW plate heat exchanger as an automatic integral bypass. 5.2.5 System control Further external controls (e.g. room thermostat sensors) MUST be fitted to optimise the economical operation of the boiler in accordance with Part L of the Building Regulations. A range of optional controls is available. Full details are contained in the relevant Sales Literature. Any proprietary OpenTherm control MUST allow individual adjustment of CH and DHW temperature. 5.2.6 Treatment of water circulating systems All recirculatory water systems will be subject to corrosion unless an ap propriate water treatment is applied. This means that the efficiency of the system will deteriorate as corrosion sludge accumulates within the system, risking damage to pump and valves, boiler noise and circulation problems. When fitting new systems flux will be evident within the system, which can lead to damage of system components. BS 7593 gives extensive recommendations on system cleansing and wa ter treatment. All systems must be thoroughly drained and flushed out using appropriate proprietary flushing agent. A suitable inhibitor must then be added to the system. All system additives (flushing agents, cleansers, inhibitors etc.) must com ply with the requirements of BS 7593. Full instructions are supplied with the products and for further information contact the additive manufacturer directly or consult their website. 5 Before installation 23 Important Any wiring to the boiler, from either the mains or an external control, MUST be cable of the following specification:- 0.75mm 3183/4/5Y (depending on installation) multi strand flexible cable conforming to BS 50525-2-11. Cable of the above specification is sufficiently flexible to with stand normal regular opening and closing of the facia/control box as expected during routine servicing and other maintenance work. Use ONLY cable glands supplied with the boiler, or provided as spares by the manufacturer. Under no circumstances must solid core cable be used as it is not intended for applications where movement may occur. The use of solid core cable could result in situations potentially haz ardous to health. These points must be considered when initially wiring the boiler to the installation, and if replacing any wiring during the service life of the boiler. Combi 2
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5.2.7 Showers If a shower control is supplied from the appliance it should be of the ther mostatic or pressure balanced type. Thermostatic type shower valves pro vide the best comfort and guard against water at too high a temperature. Existing controls may not be suitable - refer to the shower valve manufac turer. 5.2.8 Expansion vessel (CH only) The appliance expansion vessel is pre-charged to 1.0 bar. Therefore, the minimum cold fill pressure is 1.0 bar. The vessel is suitable for correct op eration for system capacities up to 100 litres. For greater system capaci ties an additional expansion vessel must be fitted. For GB refer to BS 7074 Pt 1. For IE, the current edition of IS 813 Domes tic Gas Installations. Checking the charge pressure of the vessel - to check the charge accu rately ensure the system is cold. It is also necessary to relieve the pres sure by draining the boiler. Using a suitable gauge check the pressure at the valve on the underside of the vessel. Adjust the pressure as required and repressurise the system. 5.2.9 Safety pressure relief valve 1 2 A Discharge pipe Pressure relief valve The end of the pipe should terminate facing down and towards the wall See BS 6798 for full details. The pressure relief valve is set at 3 bar, therefore all pipework, fittings, etc. should be suitable for pressures in excess of 3 bar and temperature in ex cess of 100°C. The pressure relief discharge pipe should be not less than 15mm diame ter, run continuously downward, and discharge outside the building, pref erably over a drain. It should be routed in such a manner that no hazard occurs to occupants or causes damage to wiring or electrical components. If it is anticipated that any part of the pipe may be subject to freezing it should be suitably insulated. The end of the pipe should terminate facing down and towards the wall. The discharge must not be above a window, entrance or other public ac cess. Consideration must be given to the possibility that boiling water/ steam could discharge from the pipe. Important The relief valve must never be used to drain the system. A remote relief valve kit is available to enable the boiler to be installed in cellars or similar locations below outside ground level. Fig.10 Discharge pipe 1 A 24 A boiler discharge pump is available which will dispose of both condensate & high temperature water from the relief valve. It has a maximum head of 5 metres. Important Failure to flush and add inhibitor to the system will invalidate the appliance warranty. It is important to check the inhibitor concentration after installation, system modification and at every service in accordance with the inhibitor manufac turer. (Test kits are available from inhibitor stockists.) For information or advice regarding any of the above contact Baxi Custom er Support 0344 871 1545. 5 Before installation Combi 2
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5.3 Flow rate/head at the plate characteristics Fig.11 Graph of flow rate/head at the plate BO-0000226 Tab.17 Description of graph of flow rate/head at the plate Q Flow volume h Dynamic head 85 % Minimum modulation value in heating mode 100% Maximum value in heating mode To prevent flow noise, you must pay attention to the hydraulic design of the heating installation. The system uses a high-head, modulating pump that is suitable for use on any type of one- or two-pipe heating system. The automatic air vent valve built into the pump body enables fast venting of the heating system. Operation of the pump in DHW mode —> 100% fixed. Operation of the pump in heating mode —> modulating by 85% to 100% . 5 Before installation 25 Combi 2
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5 Before installation 26 5.4 Choice of the location 5.4.1 Location of the boiler The boiler may be fitted to any suitable wall with the flue passing through an outside wall or roof and discharging to atmosphere in a position permit ting satisfactory removal of combustion products and providing an ade quate air supply. The boiler should be fitted within the building unless oth erwise protected by a suitable enclosure i.e. garage or outhouse. (The boiler may be fitted inside a cupboard.) Where the boiler is sited in an unheated enclosure and during periods when the heating system is to be unused it is recommended that the per manent live is left on to give BOILER frost protection. NOTE: THIS WILL NOT PROTECT THE SYSTEM ! If the boiler is fitted in a room containing a bath or shower reference must be made to the relevant requirements. In GB this is the current IEE Wiring Regulations and Building Regulations. In IE reference should be made to the current edition of IS 813 Domestic Gas Installations and the current ETCI rules. It is not necessary to protect any surface the boiler is mounted on from heat generated during normal operation unless required by local authority regulations. If the boiler is to be fitted into a building of timber frame construction then reference must be made to the current edition of Institute of Gas Engi neers Publication IGE/UP/7 (Gas Installations in Timber Framed Housing). Fig.12 Bathroom 1 and 2 PN-0000400 A B C D D 0.6m A B C D E F 0.6m 2.25m 5.4.2 Bath and shower rooms A B C Zone 0 Zone 1 Zone 2 D E F Window recess Zone 2 Ceiling Outside zones Important The boiler has a protection rating of IPX5D and if installed in a room containing a bath or shower can be within Zone 2 (but not 0 or 1). Bathroom 1 and 2 ( in GB only) shows zone dimensions for a bathtub. For other examples refer to the Current IEE Wiring Regulations). Reference must be made to the relevant requirements. In GB this is the current IEE. Wiring Regulations and Building Regulations. In IE reference should be made to the current edition of IS 813 “Domestic Gas Installations” and the current ETCI rules. Combi 2
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5 Before installation 27 5.4.3 Ventilation Where the appliance is installed in a cupboard or compartment, no air vents are required. BS 5440: Part 2 refers to room sealed appliances in stalled in compartments. The appliance will run sufficiently cool without ventilation. 5.4.4 Condensate drain It is strongly recommended to discharge internally into the household drainage system. If connecting to a rain water drain, that drain MUST dis charge into a foul drain. 1 2 3 4 5 6 7 8 9 10 11 12 Pipework. Insulation. 50mm per metre of pipe run — 2.5° minimum run. 450mm minimum is applicable to properties up to 3 storeys. For multi-storey building installations consult BS 6798. Boiler. Sink. Pipe must terminate above water level but below surrounding sur face. Cut end at 45°. Holes in the soak-away must face away from the building. 500mm mimimum. Basement or similar (heated) Condensate pump Unheated Location (e.g. Garage) Tab.18 Examples are shown of the following methods of termination Key Description A Termination to an internal soil and vent pipe. B External termination via internal discharge branch e.g. sink waste — downstream (It is NOT RECOMMENDED to connect upstream of the sink or other waste water receptacle!) C Termination to a drain or gully. D Termination to a purpose made soakaway Further specific re quirements for soakaway design are referred to in BS 6798 E Pumped into an internal discharge branch (e.g. sink waste) down stream of the trap. F Pumped into an external soil and vent pipe. G Termination to a drain or gully with extended external run and trace heating. The "Trace Heating" element must be installed in accordance with the instructions supplied. External runs and those in unheated locations still require insulation. Fig.13 Pipework and method of termination PN-0000389 A B C D 3 3 3 3 4 6 5 5 5 5 7 7 8 9 21.5mm 32mm 2 Combi 2
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5 Before installation 28 Important Failure to install the condensate discharge pipework correctly will affect the reliable operation of the boiler. Careful consideration must be given to the possibility of the pipe work being subject to freezing conditions and appropriate meas ures taken to prevent blockage. Correct installation in accordance with this section will considerably minimise the likelihood of block age and subsequent boiler lock-out. A condensate discharge pump and pipe "Trace Heating" are avail able as accessories. The condensate discharge pipe MUST NOT RISE at any point along its length. There MUST be a fall of AT LEAST 2.5° (50mm per metre) along the entire run EXCEPT when employing a suita ble condensate pump in basement and cellar or similar applica tions. The boiler condensate trap incorporates a seal of 75mm, therefore it is unnecessary to install an air break and trap in the discharge pipework. The condensate outlet will accept 21.5mm (3/4in) plastic overflow pipe. It is strongly recommended that this discharges internally into the household drainage system. Where this is not possible, discharge into an outside drain is permissible providing every possible precaution is taken to prevent freezing. Ensure the discharge of condensate complies with any national or local regulations in force. BS 6798 & Part H1 of the Building Regulations give further detailed guidance. The discharge pipe should be run in a proprietary drain pipe material e.g. PVC, PVC-U, ABS, PVC-C or PP. Metal pipework is NOT suitable for use in condensate discharge systems. The pipe should be a minimum of 21.5mm diameter and must be suppor ted using suitably spaced clips of the correct design to prevent sagging. It is advisable that the full length of condensate pipe is run internally and preferably be less than 3 metres. Internal runs greater than 3 metres or runs in cold areas should use 32mm waste pipe. External runs MUST be a MINIMUM of 32mm and fully insulated with ma terial suitable for external use. If the boiler is fitted in an unheated location the entire condensate dis charge pipe should be treated as an external run and sized and insulated accordingly. In all cases discharge pipe must be installed to aid disposal of the conden sate. To reduce the risk of condensate being trapped, as few bends and fittings as possible should be used and any burrs on cut pipe removed. When discharging condensate into a soil stack or waste pipe the effects of existing plumbing must be considered. If soil pipes or waste pipes are sub jected to internal pressure fluctuations when WC's are flushed or sinks emptied then backpressure may force water out of the boiler trap and cause appliance lockout. A boiler discharge pump is available which will dispose of both condensate & high temperature water from the relief valve. It has a maximum head of 5 metres. Follow the instructions supplied with the pump. Condensate Drain Pipe "Trace Heating" Elements are available in various lengths, 1, 2, 3 & 5 metres. Where the drain is between 3 & 5 metres a 5 metre kit can be used and "doubled back" upon itself. It is possible to fit the element externally on the condensate drain or inter nally as detailed in the instructions provided. The fitting of a "Trace Heating" Element is NOT a substitute for correct in stallation of the condensate drain. ALL requirements in this section must still be adhered to. Fig.14 Methods of termination continued PN-0000455 E 3 5 F G 3 3 5 5 7 7 10 11 11 10 12 6 Combi 2
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5 Before installation 29 5.4.5 Clearances A flat vertical area is required for the installation of the boiler and it should be capable of bearing the weight of the boiler when full of water. These dimensions include the necessary clearances around the boiler for case removal, spanner access and air movement. Additional clearances may be required for the passage of pipes around local obstructions such as joists running parallel to the front face of the boiler. In the diagram these are MINIMUM recommended dimensions. Greater clearance will aid installation and maintenance. 5.4.6 Flue/chimney location The following guidelines indicate the general requirements for siting bal anced flue terminals. For GB recommendations are given in BS 5440 Pt 1. For IE recommendations are given in the current edition of I.S. 813 Do mestic Gas Installations. Important Due to the nature of the boiler a plume of water vapour will be dis charged from the flue. This should be taken into account when sit ing the flue terminal. Fig.16 Flue outlets R T U J,K J,K A D E C I I I A A S F H H B G F I I L N M PN-0000456 1 1 Flue positions marked require a flue terminal guard. Tab.19 Terminal position with minimum distance Key Description mm Key Description mm A (1) Directly below an opening, air brick open ing window etc. 300 J From a surface or boundary line facing a terminal 600 B (1) Above an opening, air brick, opening win dow etc. 300 K From a terminal facing a terminal (Horizontal flue) 1200 From a terminal facing a terminal (Ver tical flue) 600 Fig.15 Clearances min. 250 2,5 6 1000 291 700 BO-0000227 2,5 395 Combi 2
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5 Before installation 30 Key Description mm Key Description mm C (1) Horizontally to an opening, air brick, opening window etc. 300 L From an opening in carport (e.g. door, window) into the dwelling 1200 D (2) Below gutters, soil pipes or drain pipes 25 (75) M Vertically from a terminal on the same wall 1500 E (2) Below eaves 25 (200) N Horizontally from a terminal on the same wall 300 F (2) Below balconies or car port roof 25 (200) R From adjacent wall to flue (vertical on ly) 300 G (2) From a vertical drain pipe or soil pipe 25 (150) S From an adjacent opening window (vertical only) 1000 H (2) From an internal or external corner 25 (300) T Adjacent to windows or openings on pitched and flat roofs 600 I Above ground, roof, or balcony level 300 U Below windows or openings on pitch ed roofs 2000 (1) In addition, the terminal should be no nearer than 150mm to an opening in the building fabric formed for the purpose of accommodating a built-in element such as a window frame. (2) Only ONE 25mm clearance is allowed per installation. If one of the dimension D,E,F,G or H is 25mm then the remainder MUST be as shown in brackets, in accordance with BS 5440–1. Important Under car ports we recommend the use of the plume displace ment kit. The terminal position must ensure the safe and nuisance - free dispersal of combustion products. If the terminal discharges onto a pathway or passageway, check that com bustion products will not cause a nuisance and that the terminal will not obstruct the passageway. If a terminal is less than 2 metres above a balcony, above ground or above a flat roof to which people have access, then a suitable terminal guard must be provided. 1 2 3 A Property boundary line Terminal assembly Top view rear flue 300mm minimum* *Reduction to the boundary is possible down to 25mm but the flue deflec tor must be used. Important The distance from a fanned draught appliance terminal installed parallel to a boundary may not be less than 300mm in accordance with the diagram opposite. Fig.17 Property boundary PN-0000457 3 1 2 A* Combi 2
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5 Before installation 31 1 2 3 A Opening window or door Air inlet Plume displacement kit 150mm minimum Important If fitting a Plume Displacement Flue Kit, the air inlet must be a minimum of 150mm from any opening windows or doors. Important The Plume Displacement flue gas discharge terminal and air inlet must always terminate in the same pressure zone i.e. on the same facing wall. 5.4.7 Horizontal flue/chimney systems 1 2 3 315mm to 500mm Flue trims This bend is equivalent to 1 metre Total equivalent length = A+B+C+2x90° bends Important Horizontal flue extensions should always be installed with a fall of at least 1.5° from the terminal to allow condensate to run back to the boiler. The standard telescopic flue is suitable only for horizontal termination ap plications. It allows for lengths between 315mm and 500mm from elbow to terminal without the need for cutting. Extensions of 250mm, 500mm and 1m are available. All fittings should be fully engaged. The approximate engagement is 40mm. Apply the lubricant supplied to the seal on each fitting to aid as sembly. Tab.20 Maximum permissible equivalent flue lengths are:- Horizontal concentric 60/100 Diameter 80/125 Diameter 10 metres 20 metres Any additional "in line" bends in the flue system must be taken into consid eration. Tab.21 Their equivalent lengths are:- Concentric pipes 135° bend 0.5 metres 93° bend 1.0 metres The elbow supplied with the standard horizontal telescopic flue kit is not included in any equivalent length calculations. Important Flue length is measured from point (i) to (ii) as shown. See Read this section in conjunction with the Flue Installation Guide supplied with the boiler. This document includes details of vertical flue/chimney systems and plume displacement kits. Fig.18 Plume displacement kit PN-0000458 3 1 2 A Fig.19 Horizontal flues PN-0000459 3 1 2 A 3 C B (i) (ii) Combi 2
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5 Before installation 32 Warning SUPPORT - All flue systems MUST be securely supported at a MINIMUM of once every metre & every change of direction. It is recommended that every straight piece is supported irrespective of length. Additional supports are available as accessories. VOIDS - Consideration must be given to flue systems in voids and the provision of adequate access for subsequent periodic visual inspection. 5.4.8 Flue/chimney trim The flexible flue trims supplied can be fitted on the outer and inner faces of the wall of installation. 5.4.9 Terminal guard 1 ENSURE THAT NO PART OF THE WHITE OUTER CHIMNEY DUCT IS VISIBLE. When codes of practice dictate the use of terminal guards Multifit accesso ry part no. 720627901 can be used Important This guard is not compatible with Flue Deflector referred to below. There must be a clearance of at least 50mm between any part of the ter minal and the guard. When ordering a terminal guard, quote the appliance name and model number. The flue terminal guard should be positioned centrally over the terminal and fixed as illustrated. 5.4.10 Flue/chimney deflector 1 Flue deflector Push the flue deflector over the terminal end. It may point upwards as shown, or up to 45° either way from vertical. Secure the deflector to the terminal with screws provided. 5.4.11 Flue/chimney accessories See For full details of Flue Accessories (elbows, extensions, clamps etc.) refer to the Flue Installation Guide supplied in the literature pack. Fig.20 Flexible flue trims PN-0000390 Fig.21 Terminal guard PN-0000460 1 Fig.22 Flue deflector PN-0000461 1 Combi 2
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5 Before installation 33 5.4.12 Data plate and boiler service label The data plate is located on the top part of the boiler. The data plate provides important information about the appliance (see the sample data plate shown in the figure): Tab.22 Description of the data plate "BRAND" Commercial brand. "Code" Product code. "Product name" Model name Qn Hi Nominal input (lower heating value). Pn Effective rated output (flow 80°C return 60°C). PMS Maximum heating circuit pressure (bar). PMW Maximum domestic water circuit pressure (bar). D Specific flow rate (l/min). NOx NOx class. IP Protection rating. V-Hz-W Power supply and output. Bxx/Cxx Flue gas exhaust type. I2H Gas category used (depends on the country of use). CN1/CN2 Factory parameters. s/n Serial number. Tab.23 Service label description "Code" Product code. "Product name" Model name. "s/n" Serial number. Fig.23 Position of the data plate BO-0000234 “BRAND” Qn Hi Pn 80/60°C Pn 50/30°C PMS PMW D NOx 4,9-24,7 4,8-24 kW kW kW kW kW kW 4,9-20,6 4,8-20 5,2-21,8 3 bar <95 °C 8 bar 10,9 l/min 5 3P - G31 - 37 mbar 2H - G20 - 20 mbar IT II 2H3P X 0085- C13 C33 C43 C53 C63 C83 B23 230 V~50 Hz - 84 W - IP X5D 72xxxxx.xx s/n: 143800001 CN1=1 CN2=1 72xxxxx “Product name” Fig.24 Data plate BO-0000010 Qn Hi Pn 80/60°C Pn 50/30°C PMS PMW D NOx xx - xx xx - xx kW kW kW kW kW kW xx - xx xx - xx xx - xx 3 bar <95 °C 8 bar xx l/min x 3P - G31 - 37 mbar 2H - G20 - 20 mbar XX II xxxxx X 0085 xxx V ~ xx Hz - xx W - IP xxx 7xxxxxx.xx s/n: xxxxxxxxx CN1=x CN2=x “Code” “Product name” “ BRAND ” Cxx..Cxx..Bxx..Bxx Fig.25 Service label BO-0000012 “Code” “Product name” “s/n” 5.5 Transport Transport the packaged appliance horizontally using a suitable cart. The boiler may be transported vertically using a two-wheel cart, only for short distances. Warning Moving the boiler is a job for two people. Combi 2
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5 Before installation 34 5.6 Unpacking & initial preparation 5.6.1 Unpacking Caution RISK ASSESSMENT - Before commencing the installation it is recommended that the "Five Steps to Risk Assessment" docu ment published by the HSE is consulted, and an assessment per formed as described. GAS SUPPLY - The gas supply, gas type and pressure must be checked for suitability before connection. See Handling, page 9 before unpacking or lifting the boiler. To unpack the boiler: 1. Remove the banding and the cardboard sleeve. 2. Remove the polystyrene top piece and installation kit. 3. Snap off the rear part of the polystyrene bottom piece. Important Polystyrene base should be removed completely if fitting the boiler into a space with minimum side clearances of 5 mm each side. Important If removing the polystyrene base, the sealing caps can also be re moved at this stage. Care must be taken to avoid damage from any residual water in the boiler. Fig.26 Unpacking the boiler BO-0000071 5 1 2 3 4 LIFT 10 6 7 8 9 b a LIFT Combi 2
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5.7 Connecting diagrams A B C D E Domestic hot water mains inlet Central heating return Stop valve Double check valve (Not supplied) Loop (Temporary or Permanent) A filling point connection on the central heating return pipework must be provided to facilitate initial filling and pressurising and also any subsequent water loss replacement/refilling. The filling method adopted must be in accordance with all relevant water supply regulations and use approved equipment. Your attention is drawn to: for GB: Guidance G24.2 and recommendation R24.2 of the Water Regu lations Guide. for IE: the current edition of I.S. 813 Domestic Gas Installations. A Cold mains in B Heat return The sealed primary circuits may be filled or replenished by means of a temporary connection between the circuit and a supply pipe, provided a "Listed" double check valve or some other no less effective backflow pre vention device is permanently connected at the inlet to the circuit and the temporary connection is removed after use. When the optional permanent filling link is fitted it is not necessary to re move any part of it after filling or re-pressurising. Fig.28 System filling circuit PN-0000347 A B C C D E 5 Before installation 35 5.7.1 Filling information 5.6.2 Initial preparation 1. 2. 3. 4. After considering the site requirements position the fixing template on the wall ensuring it is level both horizontally and vertically. Mark the position of the two most suitable fixing slots for the wall plate. Mark the position of the centre of the flue hole (rear exit). For side flue exit, mark as shown. If required, mark the position of the gas and water pipes. Remove the template. 5. Cut the hole for the flue (minimum diameter 116mm). 6. 7. Drill the wall as previously marked to accept the wall plugs supplied. Secure the wall plate using the fixing screws. Using a spirit level ensure that the plate is level before finally tight ening the screws. Fig.27 Template 150 mm Combi 2
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Important In instances where the mains water supply incorporates a non-re turn backflow prevention device, or any other device that includes one*, it is possible for a build-up of pressure to occur. This may re sult in damage to the boiler and other appliances. To prevent damage to the boiler it is strongly recommended that a suitable mini expansion vessel is fitted on the mains water inlet between the boiler and the non-return device. *(The manufacturer of the device should be consulted if there is any doubt regarding the presence of a non-return feature). Even in circumstances where a non-return device is not fitted any future modifications to the mains inlet (e.g. fitting of a water meter) should be considered and an expansion vessel fitted. Main cannot accept any responsibility for damage to the boiler if these recommendations are not followed. The boiler’s maximum working mains pressure is 8 bar, therefore all pipe work, connections, fittings, etc. should be suitable for pressures in excess of 8 bar. A pressure reducing valve must be fitted for pressures in excess of 8 bar. The manufacturer of any outlet fittings, such as a shower valve, may require a lower maximum pressure. The pressure reduction must take account of all fittings connected to the DHW system. 5 Before installation 36 The Water Regulations recommendations for England and Wales prohibits backflow from appliances into the wholesome water supply due to thermal expansion. However this type of instantaneous combination boiler, with less than 15 litres of stored capacity, does not require any backflow pre vention device as any thermal expansion is accommodated within the ap pliance. It is possible in certain circumstances that other cold water de mands (e.g. washing machines, flushing of WCs) may affect the DHW function of the boiler. In these instances the fitting of a backflow prevention device and expansion vessel is recommended. 5.7.2 Domestic hot water circuit A B C D E F G Boiler Expansion vessel Check valve Pressure reducer Stop tap To hot tap Other tap outlets All DHW circuits, connections, fittings, etc. should be fully in accordance with relevant standards and water supply regulations. Your attention is drawn to: for GB: Guidance G17 to G24 and recommendation R17 to R24 of the Water Regulations Guide. for IE: the current edition of IS 813 Domestic Gas Installations. Fig.29 Circuit plan PN-0000350 A B G C D E F Combi 2
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6 Installation 6.1 General 37 Installation must be carried out in accordance with the prevailing regula tions, codes of practice and the recommendations in this manual. Danger If the boiler is installed in a compartment do not use it for storage purposes. Do not obstruct any purpose provided ventilation open ings. Caution Where the boiler is sited in an unheated enclosure provision must be made to protect against frost, e.g. frost thermostat, pipe ther mostat. 1. Lift the boiler by gripping "a" and "b" and hook the boiler onto the wall plate. 2. Remove the polstyrene bottom piece by slipping it off downwards. 3. Remove the sealing caps from the boiler connections under the boiler (including the condensate trap). Warning Some residual water may escape when removing the sealing caps. Take precautions to avoid damage to components ! 4. Remove the taps, elbow and sealing washers from the fitting kit. The taps and elbow accept 15mm or 22mm copper pipe as appropriate — see template. 5. Connect the appropriate tap to the heating flow and return pipework, gas supply and mains cold inlet. 6. Connect the elbow to the DHW flow outlet. 7. Using the sealing washers provided connect the taps and elbow to the boiler. 8. Ensure all joints are tight. Important Connect the pressure relief discharge pipe first before any other pipework. 6.2 Assembly 6.2.1 Fitting the pressure relief discharge pipe 1. Remove the discharge pipe from the kit. 2. Determine the routing of the discharge pipe in the vicinity of the boil er. Make up as much of the pipework as is practical, including the discharge pipe supplied. Important Make all soldered joints before connecting to the pressure relief valve. Do not adjust the position of the valve. The discharge pipe must be installed before pressurising the system. 3. The pipework must be at least 15mm diameter and run continuously downwards to a discharge point outside the building. 4. 5. Firmly engage the flange on the pipe into the pressure relief valve outlet grommet, ensuring it is pushed fully in. Complete the discharge pipework and route it to the outside dis charge point. Fig.32 Pressure relief pipe connection Fig.30 Mounting the boiler Fig.31 Connecting the taps 6 Installation Combi 2
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6 Installation 38 6. The pipework must be clipped at suitable intervals to support it, com mencing as close to the boiler as possible. 6.2.2 Connecting the condensate drain 1. Remove the blanking cap, and using the straight rubber coupling supplied, connect the condensate drain pipework to the boiler con densate trap outlet pipe. See Ensure the discharge of condensate complies with any national or local regulations in force (see HHIC recommendations). See Condensate drain, page 30. 2. The straight rubber coupling will accept 21.5mm (3/4 in) plastic over flow pipe which should generally discharge internally into the house hold drainage system. If this is not possible, discharge into an out side drain is acceptable. Important The boiler condensate trap should be primed by pouring approxi mately 300ml of water into the flue spigot. Do not allow any water to fall into the air inlet. 6.3 Air supply/flue gas connections 6.3.1 Connecting the flue/chimney HORIZONTAL TELESCOPIC FLUE (concentric 60/100) 1 2 3 315mm to 500mm Connection assembly Terminal assembly There are two telescopic sections, the terminal assembly and the connec tion assembly, a roll of sealing tape and two self tapping screws. A 93° el bow is also supplied. The two sections can be adjusted to provide a length between 315mm and 500mm when measured from the flue elbow (there is 40mm engagement into the elbow). 1. Locate the flue elbow on the adaptor at the top of the boiler. Set the elbow to the required orientation. Important The flue elbow is angled at 93° to ensure a fall back to the boiler. 2. 3. Measure the distance from the outside wall face to the elbow. This dimension will be known as " X" . If the distance from the flue elbow to the outside face of the wall is less than 250mm the connection assembly can be discarded and the terminal assembly fitted directly into the elbow. 4. In instances where the dimension " X" is between 250mm and 315mm it will be necessary to shorten the terminal assembly by careful cutting to accommodate walls of these thicknesses. Fig.33 Pour 300ml of water into flue spigot PN-0000602 Fig.34 Telescopic flue PN-0000462 3 1 2 Fig.35 Flue dimension X PN-0000463 X X Combi 2
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5. To dimension " X" add 40mm. This dimension to be known as "Y" . 1 2 3 4 TOP label Sealing tape Securing screw Peak to be uppermost 6. Adjust the two telescopic sections to dimension "Y" and seal the joint with the tape provided. Ensure that the labels marked "TOP" on the terminal and connection assemblies are uppermost. 7. 8. Using the clearance holes in the connection assembly secure it to the terminal assembly using the screws supplied with the telescopic flue. Remove the flue elbow and insert the flue through the hole in the wall. Fit the flue trims if required, and refit the elbow to the boiler adaptor, ensuring that it is pushed fully in. Secure the elbow with the screws supplied in the boiler fitting kit. 1 2 3 4 5 A B C Flue elbow Boiler adaptor Telescopic flue Flue trim Securing screw Apply the lubricant supplied for ease of assembly (do not use any other type). Ensure flue is fully engaged into elbow. Apply the lubricant supplied for ease of assembly (do not use any other type). Ensure elbow is fully engaged into boiler adaptor. Peak to be uppermost 9. Draw the flue back through the wall and engage it in the elbow. It may be necessary to lubricate to ease assembly of the elbow and flue. 10. Ensure that the terminal is positioned with the slots to the bottom. Secure to the elbow with the screws supplied with the telescopic flue. Important It is essential that the flue terminal is fitted as shown to ensure correct boiler operation and prevent water entering the flue. 11. Make good between the wall and air duct outside the building, ap propriate to the wall construction and fire rating. 12. If necessary fit a terminal guard. Fig.36 Flue dimension Y PN-0000464 Y 1 2 1 3 4 Fig.37 Attaching the flue PN-0000465 1 2 3 4 4 5 A B C 6 Installation 39 6.4 Electrical connections The electrical safety of the equipment is only ensured when it is correctly connected to an effective earthing system in accordance with the prevailing safety standards for installations. The boiler must be electrically connected to a 230 V single phase + earth mains supply using the three- wire cable provided, respecting the Line-Neutral polarity. Caution This connection must be made using a two-pole switch with contact opening of at least 3 mm. If the power supply cable must be replaced, a harmonised “HAR H05 VV- F” 3x0.75 mm2 cable with a maximum diameter of 8 mm must be used. Warning Check that the total nominal consumption of the accessories connected to the appliance is less than 1 A. If it is higher, a relay must be installed between the accessories and the electronic board. Combi 2
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6.4.1 Accessing the electrical connections Fig.38 Accessing the circuit board 6 Installation 40 To access the electrical connection board: Pull the control panel downwards (1). Lift the rear cover (2). Release the four catches to remove the cover (3) (do not use excessive force as this could break the plastic hooks). Important Do not use excessive force as this could break the plastic hooks. See Section 10.3.1 Accessing the boiler components to remove the front cover 1 2 3 To add one or more wires to the boiler wiring, proceed as follows: Undo the screw (1) on the multiple cable gland (A) located on the lower right-hand side of the boiler (the screw serves a cable gland); Determine the correct diameter for the cable gland, then cut the corresponding plug (2), as shown in the figure and feed the wire into the hole; Connect the wire then secure the cable gland in place by tightening the screw (1). The supply cable is connected to the terminal board as shown in the figure below. L: 230 V (brown wire) N: Neutral (blue cable) : Earth connection: Fig.40 Connecting wires to the PCB 6.4.2 Connecting the room thermostat Before connecting the room thermostat (RT) or Open Therm (OT) device, remove the link wire on the terminal board as shown in figure 40. Fig.41 Connecting the room thermostat RT BO-7746442-5 N L Combi 2 Important An ON/OFF room thermostat (also H.V. 230V) can be connected to the RT connector. On the OT connector it is possible to connect a low voltage or Open therm, Rbus, room thermostat. To use a H.V. thermostat remove the link between RT connector and maintain the link on the OT connector. If you want to use an OT thermostat remove the link between OT connector and maintain the link on the RT connector. Fig.39 Adding wires to the PCB
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41 6 Installation 6.4.3 Service connection (SERVICE) Connect the wireless interface to terminal X10 on the boiler PCB, as shown in the chapter entitled "Electrical diagram". 6.4.4 Connecting on wall outdoor sensor The sensor must be fixed to an external wall surface of the property it is serving. The wall must face north or west. Under no circumstance must it be fixed to a south facing wall in direct sunlight. The sensor must be positioned approximately at half the height of the liv ing space of the property, and a minimum of at least 2.5 metres above ground level. To ensure accurate operation do not position the sensor in the proximity of any heat or cooling source (e.g. a flue terminal). Siting above doors & win dows, adjacent to vents and close to eaves should be avoided. 1. 2. 3. Once the position has been determined, prise the cover off the sen sor and mark through the sensor body the two fixing holes and the larger hole for the wiring. Drill & plug the two fixing holes (plugs and screws are supplied with the sensor). Also drill the hole for the sensor wiring. Insert the sensor wiring through the hole in the wall, leaving suffi cient length outside to allow connection. Seal the hole. Note: 0.5mm 2 core cable is recommended (the sensor is a low voltage device). This wiring is NOT supplied in the kit. 4. If it is not possible to pass the wiring through the wall directly behind, remove the circular ‘knock-out’ panel in the sensor base to allow connection. 5. Using the screws provided fit the body to the wall. Insert the wires in the two-way terminal block and secure them. Replace the sensor cover. 6. Ensure the electrical supply to the boiler is isolated and remove the front panel. 7. Hinge down the control box and unclip the terminal block cover. 8. Pass the wires from the sensor through one of the gland nuts in the bottom of the boiler lower panel, leaving sufficient slack to allow the control box to be hinged fully open. Tighten the nut. Fig.42 Sensor position N S W E X X North West 1/2 H 2.5m Min H PN-0000626 6.4.6 Identifying label Important The identifying label (7221476-01) supplied with the outdoor sen sor must be signed and affixed on or adjacent to the boiler. The label must be readily accessible without removing the boiler cas ing or any other disassembly. This label is required to enable SAP and energy assessors to identify that a weather compensation de vice is installed and connected . 6.4.5 Connecting the outside sensor Important Set the type of outside sensor used by implementing setting AP056 (see table paragraph "List of installer settings"). Connect the outside sensor to the T/OUT port on the connection board. Fig.43 Connecting the outside sensor (OS) Combi 2
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6.5 Filling the installation 6.6 Draining the installation The drain cock is inside the boiler (in the lower left-hand section). To access the cock and drain it, proceed as follows: 1. Remove the front panel from the boiler and turn the control panel downwards, as shown in the adjacent figure. 2. Slowly open the cock (E) anti-clockwise to drain the boiler and the system. Do not use tools. 3. Close the cock by turning it clockwise, without using excessive force. Fig.45 Draining the installation E BO-7746442-3 6 Installation 42 6.5.1 Flushing the system Flush thoroughly and treat the system according to guidance given in BS 7593. 6.5.2 Fill the installation A filling point connection on the central heating return pipework must be provided to facilitate initial filling and pressurising and also any subsequent water loss replacement/refilling. 1. Fill the installation using approved equipment and in accordance with all relevant water supply regulations. Important Your attention is drawn to: for GB: Guidance G24.2 and recommendation R24.2 of the Wa ter Regulations Guide. for IE: the current edition of I.S. 813 "Domestic Gas Installa tions" . 2. The sealed primary circuits may be filled or replenished by means of a temporary connection between the circuit and a supply pipe, provi ded a ‘Listed’ double check valve or some other no less effective backflow prevention device is permanently connected at the inlet to the circuit and the temporary connection is removed after use. 3. Fill or replenish the sealed primary circuits by means of a temporary connection between the circuit and a supply pipe: Permanently connect a ‘Listed’ double check valve or some other no less effective backflow prevention device at the inlet to the cir cuit. Remove the temporary connection after use except if where a per manent connection is used. 6.5.3 Filling the condensate trap 1. Check that the boiler condensate trap has been primed before com missioning the boiler. Fig.44 Filling the installation BO-7742388 BO-7769517 Combi 2
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Commissioning the boiler is done for first time use, after a prolonged shut- down (more than 28 days) or after any event that would require complete re-installation of the boiler. Commissioning of the boiler allows the user to review the various settings and checks to be made to start up the boiler in complete safety. 7.2 Checklist before commissioning Perform the following checks before commissioning the boiler: 1. Check that the gas type supplied matches the data shown on the boiler's data plate. Danger Do not commission the boiler if the gas supplied does not match the gas types approved for the boiler. 2. Check the connection of the earthing cable. 3. Check the gas circuit from the non-return valve to the burner. 4. Check the hydraulic circuit from the boiler's isolation valves to the heating circuit. 5. Check that the hydraulic pressure in the heating installation is between 1.0 and 1.5 bar. 6. Check the power supply connections to the various boiler components. 7. Check the electrical connections on the thermostat and the other external components. 8. Check the ventilation in the room in which the system is installed. 9. Check the flue gas connections. 7.3 Commissioning procedure Proceed as described below to commission the boiler: Open the main gas cock. Open the gas cock on the boiler. Open the front panel as described in the chapter entitled "Accessing the boiler electrical connection board". Check the gas supply pressure at the pressure socket on the gas valve. Check the leak tightness of the gas connections in the boiler upstream of the gas valve. Check the tightness of the gas pipe, including the gas valves. The test pressure must not exceed 60 mbar (6 kPa). Degas the gas supply pipe by unscrewing the pressure socket on the gas valve. Reclose the socket once the pipe has been sufficiently bled. Check that the siphon is full of water as described in the chapter entitled "Filling the siphon". Check that there are no leaks in the hydraulic connections. Check the seal/condition of the flue gas pipes. Use the two-pole switch to supply voltage to the boiler. Important For instructions on igniting the boiler, see the following chapter entitled “Procedure for first start-up”. 7 Commissioning 7.1 General 43 7 Commissioning Combi 2
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44 7 Commissioning 7.4 Gas settings 7.4.1 Check the operational (working gas inlet pressure and gas rate) Note If the pressure drops are greater than shown in the diagram oppo site, a problem with the pipework or connections is indicated. Per missible pressure drop across system pipework ≤ 1mbar. Carry out chimney sweep. See Checking combustion - chimney sweep mode, page 49. Fig.46 Gas meter to valve EV1 EV2 P. OUT 1 2 3 4 VENT RQ ADJ. 17-21 mbar PN-0000361 19-23 mbar 18-22 mbar A 1. 2. 3. With the boiler operating in the maximum rate condition check that the operational (working) gas pressure at the inlet gas pressure test point is in accordance with BS 6798 & BS 6891. This must be AT LEAST 18mb ! Ensure that this inlet pressure can be obtained with all other gas ap pliances in the property working. The pressure should be measured at the gas test point on the gas inlet (A). Measure the gas rate — With any other appliances & pilot lights turned OFF the gas rate can be measured. The gas rate can be found in section 3. Technical specifications. Fig.47 Gas inlet test point 7.4.2 Combustion parameters The boiler has two dedicated sockets in order to measure the combustion efficiency and cleanliness of the combustion exhaust gases during operation. One socket is connected to the flue gas exhaust circuit (A) which is used to detect the cleanliness of the combustion exhaust gases and the combustion efficiency. The other is connected to the combustion air intake circuit (B) which is used to check for the possible recirculation of the combustion exhaust gases in the case of coaxial pipes. The following parameters can be measured when using the socket connected to the flue gas circuit: temperature of the combustion exhaust gases; concentration of oxygen O2 or alternatively carbon dioxide CO2; concentration of carbon monoxide CO. The temperature of the combustion air must be measured using the socket connected to the air intake circuit (B), inserting the measurement probe approx. 7 cm. In order to analyse the combustion exhaust gases, the chimney sweep function must be activated, as described below. Fig.48 Type of fittings — flue gas measuring point 7 cm A B A Combi 2
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7 Commissioning 45 Fig.49 Examples of combustion checks Caution To analyse the products of combustion, ensure adequate heat exchange in the system in heating mode or in domestic water mode (by opening one or more domestic hot water cocks) to avoid the boiler shutting down as a result of overheating. For correct boiler operation, the CO2 (O2) content in the combustion gases must be within the tolerance range indicated in the table below. Activating the chimney sweep function 1. Press the two F1 + F2 keys until the function activates. When the letter L appears on the display (followed by the flow temperature) the boiler is working at minimum power. Fig.50 Minimum power BO-0000230-1 2. Turn the knob one notch to the right. When the letter h appears on the display (followed by the flow temperature) the boiler is working at maximum power in HEATING MODE. Fig.51 Maximum power in heating mode BO-0000230-2 3. Turn the knob another notch to the right. When the letter H appears on the display (followed by the flow temperature) the boiler is working at maximum power in DOMESTIC WATER MODE. Important This function is carried out in heating mode. During this function, for LOW TEMPERATURE systems (such as underfloor heating), the flow temperature is limited by setting CP000 (maximum flow temperature). To activate the domestic water mode, configure the setting to GP082=1 Once finished, return the setting to GP082=0 To finish and exit the function press the F1 key. Caution Remember to return the setting to GP082=0 once the chimney sweep function is no longer in use. Fig.52 Maximum power in domestic water mode BO-0000230-3 Warning Ensure that both flue test point plugs are in place after checking combustion. F1 F1 F1 F2 F3 F4 F1 F1 F1 F2 F3 F4 F1 F1 F1 F2 F3 F4 Combi 2
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7.4.3 Service settings 46 7 Commissioning Tab.24 CO – CO2 – O2 values with the front panel CLOSED Important This appliance is suitable for G20 gas containing up to 20% hydrogen (H2). Due to variations in the percentage of H2, the percentage of O2 may vary over time. (For example: 20% of H2 in the gas may lead to a 1.5% increase of O2 in the flue gases) The gas valve may need to be adjusted more accurately. This must be adjusted using standard O2 values for the gas used. * When using mixes that are up to 20% hydrogen H2), for calibrating the gas valve only refer to the value of O2%. Combi 2
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7 Commissioning 47 %D[L&RPEL &2 PLQLPXP 1 to 8.6 24 Combi (C) - 28 Combi (C) Important Remove the Torx driver to stabilise the CO2 value if adjustment is required. * Values for G20 gas type only. For G20+20%H2 calibration of the gas valve refer to O2%. Combi 2 7.4.4 Calibrating the gas valve V K Gas flow rate setting screw - 4mm Allen key OFFSET setting screw - Torx 40 (T40) Calibration of the MAXIMUM heat input Check that the CO2 measured in the exhaust pipe, with the boiler operating at maximum heat input, is as indicated in the table entitled "Service settings". If incorrect: Put the boiler into chimney sweep high mode "H". Let the CO2 value stabilise. Fig.53 Gas valve Remove the boiler door to take measurements or make adjustments. %D[L&RPEL 24 Combi (C) - 28 Combi (C) &2* PD[LPXP 8.8 to 9.4 Important Remove the Allen key to stabilise the CO2 value if adjustment is required. Adjust the setting screw (V) located on the gas valve. Turn the screw clockwise to increase the content of CO2 and anti-clockwise to decrease it. Adjust the Offset setting screw located on the gas valve. Turn the screw clockwise to increase the content of CO2 and anti-clockwise to decrease it. * Values for G20 gas type only. For G20+20%H2 calibration of the gas valve refer to O2%. Calibration of the REDUCED heat input Check that the measurement in the exhaust pipe, with the boiler operating at minimum heat input, is as indicated in the table entitled "Service settings". If incorrect: Remove the Offset setting screw plug (K) using the Torx driver. The Offset setting screw is accessible after removing the Offset setting screw plug (K). Put the boiler into chimney sweep low mode. Let the CO2 value stabilise.
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Fig.54 Combustion procedure 7 Commissioning 48 Combi 2
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7.5 Final instructions 7.5.1 Handover 1. Carefully read and complete all sections of the Benchmark Commis sioning Checklist at the rear of this publication that are relevant to the boiler and installation. These details will be required in the event of any warranty work. Important The warranty will be invalidated if the Benchmark section is in complete. 2. The publication must be handed to the user for safe keeping and each subsequent regular service visit recorded. 3. Hand over the User’s Operating, Installation and Servicing Instruc tions, giving advice on the necessity of regular servicing. 4. For IE, it is necessary to complete a "Declaration of Conformity" to indicate compliance with I.S. 813. An example of this is given in I.S. 813 "Domestic Gas Installations" . This is in addition to the Bench mark Commissioning Checklist. 5. Set the central heating and hot water temperatures to the require ments of the user. Instruct the user in the operation of the boiler and system. 6. Instruct the user in the operation of the boiler controls. 7. Demonstrate to the user the action required if a gas leak occurs or is suspected. Show them how to turn off the gas supply at the meter control, and advise them not to operate electric light or power switched, and to ventilate the property. 8. Show the user the location of the system control isolation switch, and demonstrate its operation. 9. Advise the user that they may observe a plume of vapour from the flue terminal, and that it is part of the normal operation of the boiler. Fig.55 People PN-0000333 7 Commissioning 49 Combi 2
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8 Operation 8.1 Use of the control panel 8 Operation 50 8.1.1 Browsing the menus 1. To activate the control unit, press any button. 2. To access the settings available from the menu, press the F3 key. Tab.25 Available menu options Information menu User menu Installer menu Error menu Counter menu 3. Turn the knob to select the menu or to scroll through the settings. 4. Press the F4 key to confirm selection of the required menu. 5. Turn the knob to scroll through the list of settings. Press the F4 key to confirm selection of the setting. 6. Turn the knob to modify the setting. Press the F4 key to confirm the setting has been changed. 7. Press the F1 key to return to the home screen. Important The display shows the home screen if no keys are pressed for two minutes. If this happens, the procedure needs to be repeated. Fig.56 Accessing the menu BO-0000230-14 F1 F1 F2 F1 Fig.57 Scrolling through the menus and/or settings BO-0000230-4 8.1.2 Running the automatic detection function After removing or replacing a PCB accessory board (not main PCB), an auto-detect must be carried out. 1. Select the installer menu and type in the password to enter 2. Turn the knob until AD is displayed 3. Press the F4 button and -AD- appears on the display 4. Press the F4 knob again to activate the function 8.1.3 Information menu display . 1. Navigate to the Information menu 2. Press the F4 key to open the menu. 3. Turn the knob to scroll through the values. 4. Press the F1 key several times to go back to the home screen. Fig.58 Scrolling through the values BO-0000230-4 Counter menu display 1. Navigate to the Counter menu. 2. Press the F4 key to open the menu. 3. Turn the knob to scroll through the values. 4. Press the F1 key several times to go back to the home screen. Fig.59 Scrolling through the values BO-0000230-14 F1 F1 F1 F2 8.1.4 F1 F1 F1 F2 F3 F4 F1 F1 F1 F2 F3 F4 F4 F4 Combi 2
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8 Operation 51 8.2 Start-up 8.2.1 Procedure for first start-up The following information appears on the display when the boiler is electrically powered: 1. The message "INIT"" appears, indicating that the "Initialisation" phase is active (a few seconds); 2. The software version "Vxx.xx." appears (two seconds); 3. The software version for boiler settings "Pxx.xx." appears (two seconds); 4. The boiler and heating installation venting phase has started. During operation, the display shows in alternate mode "– – – – – – – –", the word “DEAIR” and the pressure value for the heating circuit. This phase lasts 6 minutes and 20 seconds, at the end the boiler is ready for operation; 5. The symbol and the "x.x" installation water pressure value appear. In the event of a power outage the procedure will be repeated from the beginning. To activate a heating request, the room thermostat must be set to a temperature above the current temperature (or open a domestic water tap.) 8.2.2 Changing the heating flow temperature 1. Use the knob to adjust the flow temperature in heating mode. Turn the knob anti-clockwise to reduce the temperature value. Turn the knob clockwise to increase the temperature value. Important With an outside sensor connected it is possible to lower the setpoint value. 2. Press the F4 key to confirm the value or wait a few seconds until the value is automatically saved. Important The flow temperature is matched automatically when using a: Weather-dependent regulator. OpenTherm regulator. Fig.60 Scrolling through the menus and/or settings BO-7763705-1 8.2.3 Changing the domestic hot water (DHW) temperature 1. Use the knob to adjust the domestic hot water temperature. Turn the knob anti-clockwise to reduce the temperature value. Turn the knob clockwise to increase the temperature value. 2. Press the F4 key to confirm the value or wait a few seconds until the value is automatically saved. Fig.61 Scrolling through the menus and/or settings BO-7763705-2 F1 F1 F1 F2 F3 F4 F1 F1 F1 F2 F3 F4 Combi 2
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8.3 Shutdown 8.4 Degassing function The purpose of this function is to degas the heating installation. After installing the boiler, the function activates immediately when the boiler is first started up. The function automatically activates each time the boiler power supply is turned off and then on again. To start the function manually: 52 8 Operation 8.3.1 Switching off the heating and domestic hot water (DHW) Heating mode can also be disabled by turning the until the word OFF appears on the display. Important When heating mode is re-enabled check, by turning the knob, that the comfort temperature is that requested. Important Heating is disabled but the frost protection function remains activated. knob anti-clockwise until the word OFF appears on the display. Domestic hot water mode can also be disabled by turning the To switch the boiler off completely, switch off the power supply to the appliance and close the gas cock. Important In this condition, the boiler and the heating installation are not protected against frost. knob anti-clockwise Access the installer menu and enter the password. Turn the knob until “DEAIR” is displayed. Press the F4 knob and -AIR- appears on the display Press the F4 knob again to activate the function. 8.5 Frost protection It is a good idea to prevent the heating installation from draining completely, as changing the water can result in unnecessary and damaging limescale deposits from forming inside the boiler and heating elements. If the thermal installation is not intended to be used during the winter months and there is a risk of frost, we recommend mixing suitable antifreeze solutions designed for a specific purpose (e.g. propylene glycol, which contains limescale and corrosion inhibitors) into the water in the installation. The boiler's electronic control system is equipped with an "antifreeze" function for the heating system. This function activates the boiler pump when the heating system flow temperature falls below 7 °C. If the water temperature reaches 4 °C, the burner is switched on, bringing the system water to a temperature of 10 °C. When this value is reached the burner switches off and the pump continues to operate for another 3 minutes. Important The frost protection function will not work if there is no power being supplied to the boiler or if the gas supply cock is closed. Combi 2
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9 Settings 9.1 Accessing the settings 53 To display/change the list of SERVICE settings, proceed as follows: press the F3 key, the symbol on the menu bar starts to flash; turn the knob until you reach the symbol to access user settings, symbol to access installer settings, then knob to enter code 0012 turn until you reach the press the F4 key to confirm; if accessing the installer menu, use the and confirm by pressing the F4 key turn the knob until you reach the desired setting, then press the F4 key to confirm; knob; modify the value of the setting using the press F4 to confirm; press F1 to exit. To view/modify the list of settings, it is also possible to connect the Bluetooth interface to the boiler via the connector X10. Then interface the handset (SERVICE) to the boiler using the SERVICE TOOL software. Danger FOR LOW TEMPERATURE HEATING INSTALLATIONS MODIFY SETTING CP000 ACCORDING TO THE MAXIMUM FLOW TEMPERATURE. Important The factory settings for certain settings may differ based on the market the product is destined for. Fig.62 Step 2 BO-0000230-14 F2 F1 F1 F1 BO-0000230-9 9.2 List of parameters Tab.26 Table of parameters Name Description Factory value Minimum Maximum Level AP001 Operation of contact X15 (also see setting AP098) 1: Contact open —> Heating, domestic hot water and antifreeze disabled (error code H02.10) 2: Contact open —> Heating, domestic hot water dis abled (error code H02.09) 3: Contact open —> Heating, domestic hot water and antifreeze disabled (error code E02.13 with reset re quest) 2 – – Installer AP002 Manual heating request enabled based on implemen tation of setting AP026 0: Disabled 1: Enabled 0 – – Installer AP006 Notification of low pressure in the heating installation [bar] 0.8 0.6 3.0 Installer AP009 Hours of burner ignition before the maintenance noti fication with AP010=1 3000 0 51,000 Installer AP010 Enables/disables maintenance notifications: 0: No notification 1: Customised notification (depending on settings AP009 and AP011) 0 – – Installer 9 Settings Fig.63 Step 3 F1 F1 F1 F2 F3 F4 F4 Combi 2
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9 Settings 54 Name Description Factory value Minimum Maximum Level AP011 Hours of electric boiler ignition before the mainte nance notification with AP010=1 17500 0 51,000 Installer AP016 CH operation 0: Off 1: On 1 – – User AP017 Domestic hot water (DHW) 0: Off 1: On 1 – – User AP026 Flow temperature setpoint [°C] for manual heat re quest with AP002=1 40 10 90 Installer AP056 Outside sensor 0: No outside sensor 1: AF60 2: QAC34 2 – – Installer AP063 Maximum temperature setpoint [°C] in heating and domestic water mode 80 25 90 Installer AP073 Average external temperature [°C] when switching from summer/winter mode (with outside sensor) 22 10 30 User AP074 Force summer mode (with outdoor sensor). Sanitary (DHW) enabled and heating disabled. 0: Auto according to AP073 1: Summer 0 – – User AP079 Building insulation level (with outside sensor) 0: Poorly insulated building 15: Well insulated building 3 0 15 Installer AP080 External temperature [°C] below that at which anti- frost protection is activated -10 -30 +25 Installer AP082 Not used 0 – – Installer AP091 Type of outdoor sensor used: 0: Auto 1: Wired sensor 2: Wireless sensor 3: Internet measured 4: None 0 – – Installer AP098 Configuration of boiler blocking input contact X15 (al so see setting AP001) 0: Normally open 1: Normally closed 1 0 1 Installer AP101 Type of degassing 0: Disabled 1: Auto (every time the power supply is restored) 2: Enabled (during the first commissioning only) 1 – – Installer CP000 Max. settable heating setpoint temperature [°C] 80 25 80 Installer CP020 Zone function 0: Disabled 1: Enabled 1 – – Installer CP210 Comfort mode heating curve offset (with outside sen sor) 15 15 90 Installer CP230 Heating curve slope (with outside sensor) 1.5 0 4 Installer CP470 Number of days required for the screed drying pro gram 0 0 30 Installer CP480 Screed drying starting temperature [°C] 20 20 50 Installer CP490 Screed drying stop temperature [°C] 20 20 50 Installer CP780 Zone control strategy selection 0: Automatic 1: Room Temp. based 2: Outdoor Temp. based 3: Outdoor & room based 0 – – Installer Combi 2
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9 Settings 55 Name Description Factory value Minimum Maximum Level DP003 Maximum fan speed in domestic hot water mode [rpm] See chapter "Service Set tings" – – Installer DP004 Anti-legionella function 0: Disabled 1: Weekly 2: Daily (only available with Room Unit) 0 – – User DP005 Difference between the flow temperature and the temperature requested by the calorifier tank [°C] 15 0 25 Installer DP006 Difference between the temperature detected by the calorifier tank sensor and the desired DHW tempera ture that enables a heat request [°C] 4 2 15 Installer DP007 Position of three-way valve in standby 0: CH operation 1: DHW (Domestic Hot Water) 1 – – Installer DP034 Corrects in a negative sense the value measured by the calorifier tank sensor [°C] 0 0 10 Installer DP070 Domestic hot water temperature setpoint. In the case of operation with a calorifier tank and pro gramming via room unit corresponding to the comfort setpoint [°C] * Depends on the marke (55/60) * 35 (60/65) * User DP150 Enabling the calorifier tank sensor/thermostat 0: DHW (Domestic Hot Water) sensor 1: DHW (Domestic Hot Water) thermostat 1 – – Installer DP160 Temperature setpoint of the anti-legionella function [°C] 65 60 90 Installer DP200 DHW mode: 0: Domestic hot water programming (only available with Room Unit) 1: Manual (boiler with calorifier tank) – Preheating ac tive (instantaneous boiler) 2: Antifreeze (boiler with calorifier tank) – No preheat ing (instantaneous boiler) 2 – – User DP410 Duration of the DHW anti-legionella program [mi nutes] 3 0 600 Installer DP420 Maximum anti-legionella duration time [minutes] 15 0 360 Installer DP430 Day to start the DHW anti-legionella program [day] 1: Monday 2: Tuesday 3: Wednesday 4: Thursday 5: Friday 6: Saturday 7: Sunday 1 1 7 Installer DP440 Starting time for the DHW anti-legionella program [minutes] 30 0 143 Installer GP007 Maximum fan speed in heating mode [rpm] See chapter "Service Set tings" – – Installer GP008 Minimum fan speed [rpm] See chapter "Service Set tings" – – Installer GP009 Fan starting speed [rpm] 4300 2500 6000 Installer GP082 Enabling domestic water circuit during chimney sweep function 0 0 1 Installer PP015 Pump post circulation run time after heating mode re quest [min] 3 0 99 Installer PP016 Maximum pump speed in heating mode [%] 100 80 100 Installer Combi 2
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Name Description Factory value Minimum Maximum Level PP018 Minimum pump speed in heating mode [%] 85 80 100 Installer DEAIR Manual degassing function – – – Installer CNF Configuration CN1 and CN2 - - – – Installer AD Searching for devices connected to the boiler PCB - - – – Installer Tab.27 Settings table with eMO Life Name Description Factory value Minimum Maximum Level CP060 Required ambient temperature (°C) in the zone in the holiday/antifreeze period 6 5 20 User CP070 Maximum ambient setpoint temperature (°C) in re duced mode that enables switching to comfort mode with climate control (with outside sensor) 16 5 30 User CP080 Temperature (°C) set by SLEEP activity in the zone 16 5 30 User CP081 Temperature (°C) set by HOME activity in the zone 20 5 30 User CP082 Temperature (°C) set by AWAY activity in the zone 6 5 30 User CP083 Temperature (°C) set by MORNING activity in the zone 21 5 30 User CP084 Temperature (°C) set by EVENING activity in the zone 22 5 30 User CP085 Temperature (°C) set by CUSTOM activity in the zone 20 5 30 User CP200 Required ambient temperature (°C) for the zone in manual mode 20 5 30 User CP220 Reduced mode heating curve offset (with outside sensor). 15 15 90 Installer CP240 Adjust the effect of the room unit compared to the outside sensor 3 0 10 Installer CP250 Correct the temperature measured by the room unit 0 -5 +5 User CP320 Zone operating mode 0: Scheduling 1: Manual 2: Off 0 – – User CP510 Temporary room setpoint per zone 20 5 30 User CP550 Fireplace mode 0: Disabled 1: Enabled 0 – – User CP570 Timer programme selected by User 0: Program 1 1: Program 2 2: Program 3 0 – – User CP730 Boost when starting zone heating: Modify the heat ing curve to speed up or slow down reaching of the required comfort environment 0: Extremely slowly 1: More slowly 2: Slowly 3: Normal 4: Quickly 5: Extremely quickly 3 – – Installer CP740 Building cooling speed when the heating is turned off 0: Extremely slowly 1: Slowly 2: Normal 3: Quickly 4: Extremely quickly 2 – – Installer 9 Settings 56 Combi 2
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9 Settings 57 Name Description Factory value Minimum Maximum Level CP750 Maximum preheating time [min] to reach the next programmed comfort setpoint (with outside sensor and programming via room unit) 0 0 240 Installer DP060 Timer programme selected for DHW 0: Program 1 1: Program 2 2: Program 3 0 – – User DP080 Reduced temperature setpoint for the domestic hot water tank [°C] 35 10 60 User DP337 Domestic hot water temperature setpoint for the holiday period [°C] 10 10 60 User Danger For low temperature heating installations, modify the CP000 parameter according to the maximum flow temperature. The factory settings for certain settings may differ based on the market the product is destined for. 9.2.1 Resetting factory settings 9.3 Setting the parameters Remove the jumpers. Connect the outside sensor to the T/OUT port on the connection board. Connect the "On/Off" type room thermostat or the "Open Therm" type room unit to the O/T port on the connection board. Important If the heat curve is set via an OpenTherm room unit, do not set the heat curve with these parameters. To set the curve, change the following settings: CP000: Heating flow maximum temperature set point. CP200: room temperature setpoint for zones 5.0 to 30. CP210: comfort mode climatic curve offset from 15 to 90 (with external probe). Do not change the slope of the curve. CP230: setting of the slope of the climatic curve from 0.0 to 4.0. To reset the factory settings, modify the CN1 and CN2 settings with the data on the boiler data plate. 9.3.1 Setting the heating curve Fig.64 Outside sensor connection See 9.1 Accessing the settings to access the heating curve setting. Important Set the type of outside sensor model used via the AP056 setting Combi 2 Caution Please note that resetting the CN1 and CN2 settings with data on the data plate deletes any previous setting. In case of gas change, for example, remember to set the correct calibration of the gas valve and the fan speed. Important An ON/OFF room thermostat (also H.V. 230V) can be connected to the RT connector. On the OT connector it is possible to connect a low voltage or Open therm, Rbus, room thermostat. To use a H.V. thermostat remove the link between RT connector and maintain the link on the OT connector. If you want to use an OT thermostat remove the link between OT connector and maintain the link on the RT connector.
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9.4 Reading out measured values 9 Settings Fig.65 Heating curve graph 58 C 5 CP P21 1 5 CP2 21 1 0 0 0 / / C C P220 = = = 2 30 CP210 / C P2 P22 20 0 40 CP210 / / C C P2 P2 2 2 0 0 = = 50 CP200 = 20 CP230 = 1.5 PreheatSetpoint = 0 CP000 SP_CH (°C) Tout (°C) CP000 Tout (°C) CP200 = 20 CP210 = 15 PreheatSetpoint = 0 SP_CH (°C) CP230 = 4 CP230 = 3 CP230 = 2 CP230 = 1.5 CP230 = 1.0 Tout (°C) CP000 CP230 = 1.5 CP210 = 15 PreheatSetpoint = 0 CP200 = 30 CP200 = 25 CP200 = 20 CP200 = 16 SP_CH (°C) BO-0000232 Tout: temperature detected by the outside sensor (° C) SP_CH: Heating flow temperature setpoint (°C) Proceed as described below to access the info menu: Press the F3 key; The symbol flashes on the display; Press the F4 key to access the INFO menu; Turn the knob to view the settings; Press the F1 key to exit. Setting (read only) Description Value AM001 DHW (Domestic Hot Water) mode enabled (0: Disabled, 1: Enabled) 0/1 AM010 Pump speed (0 ÷ 100%) % AM011 Service required (0: Disabled, 1: Enabled) 0/1 AM012 Status of appliance List of statuses AM014 Sub Status of appliance List of sub-statuses AM015 Pump operation (0: Disabled, 1: Enabled) 0/1 Fig.66 INFO menu access BO-0000230-14 Tab.28 Read-only parameter list (not editable) F1 F1 F1 F2 F4 Combi 2 Note Explain to the user how to select a different temperature curve and how the outdoor sensor regulates the boiler flow temperature. Important When an OpenTherm controller is connected adjustment of the boiler, e.g. heating temperature, is made using the OpenTherm controller rather than the boiler controls. The boiler controls are overridden by the OpenTherm control. Please check the function ality with the manufacturer of the OpenTherm controller.
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9 Settings 59 Setting (read only) Description Value AM016 Flow temperature °C AM018 Return temperature °C AM019 Actual water pressure in central heating system bar AM024 Current output of the boiler 0/100% AM027 Outside temperature °C AM036 Flue gas temperature °C AM037 Status of the 3-way valve (0: Heating, 1: DHW) 0/1 AM040 Outgoing DHW temperature check °C AM091 Season mode (0: winter, 3: summer) 0/3 AM101 Internal set point °C BM000 DHW temperature °C CM030 Current room temperature for zone °C CM120 Current operating mode in the zone (0: Disabled, 1: Enabled) 0/1 CM190 Zone ambient set point °C CM210 Outside temperature in the zone °C CM280 Zone calculated set point °C DM001 Temperature of the DHW tank °C DM002 Outgoing DHW flow speed l/min DM005 Solar system DHW temperature °C DM009 Primary operating mode (0: Programming, 1: Manual, 2: Antifreeze/Holiday) 0/1/2 DM019 DHW mode active (1: Comfort, 2: Low, 3: Holiday, 4: Antifreeze 1/2/3/4 DM029 DHW temperature set point °C GM001 Actual fan RPM rpm GM002 Actual fan RPM setpoint rpm GM003 Flame detected (0: Not detected, 1: Detected) 0/1 GM004 Gas valve (0: Open, 1: Closed, 2: Off) 0/1/2 GM007 Start-up (0: Off, 1: On) 0/1 GM008 Actual flame current measured μA GM012 Contact release signal X16 (0: No; 1: Yes) 0/1 GM013 Boiler shutdown signal input (0: Open, 1: Closed) 0/1 GM044 Reason for shutdown checked (0: None) 1. Heating Stoppage 2. DHW Stoppage 3. Awaiting burner ignition 4. Heating flow temperature above maximum value 5. Heating flow temperature above the starting value 6. Heat exchanger temperature above the starting value 7. Average heating flow temperature value above the starting value 8. Heating flow temperature above the setpoint value 9. Temperature difference between flow and return too great 10. Heating flow temperature above the shutdown value 11. Heat request before the minimum wait time between two consecutive requests 12. Shutdown caused by flame value being too low 13. Solar temperature above the shutdown value 0/13 9.4.1 Statuses and sub-statuses The STATUS is the operating phase of the boiler at the moment of display. To view the status, select the parameter AM012. The SUB-STATUS is the instantaneous operation the boiler is performing at the moment of display. To view the sub-status, select the parameter AM014. Combi 2
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60 9 Settings Tab.29 List of statuses STATUS Standby 0 Heat request 1 Burner ignition 2 Operation in heating mode 3 Operation in domestic water mode 4 Burner off 5 Pump post circulation 6 Burner shutdown to reach the temperature setpoint 8 Temporary fault 9 Permanent fault (fault to be reset manually) 10 Chimney sweep function at minimum output 11 Chimney sweep function at maximum output in heating mode 12 Chimney sweep function at maximum output in domestic water mode 13 Manual heat request 15 Frost protection function active 16 Venting function active 17 Boiler reset in progress 19 Tab.30 List of sub-statuses SUB-STATUS Standby 0 Wait time until next ignition in heating mode 1 Pre-ventilation 13 Burner ignition signal sent to safety core 15 Burner pre-ignition 17 Burner ignition 18 Flame check 19 Fan operation during ignition attempts 20 Operation at set temperature setpoint 30 Operation at limited temperature setpoint 31 Operation at required output 32 Level 1 gradient detected 33 Level 2 gradient detected 34 Level 3 gradient detected 35 Flame protection active 36 Stabilisation time 37 Boiler start at minimum output 38 Operation in heating mode has been interrupted by a domestic hot water request. Restart from power output in which it was interrupted. 39 Post ventilation 41 Fan off 44 Output reduction due to high flue gas temperature 45 Pump post circulation 60 Combi 2
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9 Settings 61 9.5 Reading meters Proceed as described below to access the Meter menu: Press the F3 key; The symbol flashes on the display; Turn the knob until the symbol appears, then press the F4 key to confirm; Turn the knob until you reach the required meter, then press the F4 knob until you key to confirm; To access the meters at the installer level, turn the reach the SVC symbol then press the F4 key to confirm; Use the knob to enter code 0012 and confirm by pressing the F4 key Turn the knob until you reach the required meter, then press the F4 key to confirm; press F1 to exit. Tab.31 List of meters (read only) Meters Level Description AC001 User Number of boiler power supply hours AC016 Installer Filling counter, counts the amount of filling cycles AC002 Installer Number of boiler operating hours after last maintenance operation AC003 Installer Number of boiler power supply hours after last maintenance operation AC004 Installer Failed start-up attempts after last maintenance operation AC005 User Indicative energy consumption [kW/h] in heating mode AC006 User Indicative energy consumption [kW/h] in domestic hot water (DHW) mode AC026 Installer Number of pump operating hours AC027 Installer Number of pump start-ups CLR Installer Resetting of all meters (to be confirmed by pressing the F4 key) NOTE: This parameter is only displayed if AP010 ≠ 0 DC001 Installer Total energy consumption used by domestic hot water (DHW) DC002 Installer Number of domestic hot water cycles (three-way valve switching) DC003 Installer Number of hours in domestic hot water mode (three-way valve switching) DC004 Installer Number of burner start-ups for domestic hot water mode DC005 Installer Number of burner start-up hours for domestic hot water mode GC007 User Failed start-up attempts PC001 Installer Indicative electrical energy consumption [kW/h] in heating mode PC002 Installer Number of burner start-ups for heating and domestic hot water mode PC003 Installer Number of burner start-up hours for heating and domestic hot water mode PC004 Installer Burner flame leaks Fig.67 Accessing the METER menu BO-0000230-14 F1 F1 F2 F1 F4 Combi 2
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10 Maintenance 10.1 General 10 Maintenance 62 Warning When changing components ensure that both the gas and electri cal supplies to the boiler are isolated before any work is started. When the component has been changed recommission the boiler. Always examine any seals or gaskets, replacing where necessary. The case front panel MUST seal effectively against the boiler side panels. Warning After servicing or performing any maintenance on the boiler en sure that Both flue test point plugs are in place The front cover is correctly fitted The front cover securing screws are fully tightened For reasons of safety and economy, it is recommended that the boiler is serviced annually. Servicing must be performed by a competent person in accordance with BS 7967-4. After servicing, complete the relevant Service Interval Record section of the Benchmark Commissioning Checklist at the rear of this publication. Important During routine servicing, and after any maintenance or change of part of the combustion circuit, the following must be checked:- The integrity of the complete flue system and the flue seals by checking air inlet sample to eliminate the possibility of recirculation. O2 ≥ 20.6% & CO2< 0.2% The integrity of the boiler combustion circuit and relevant seals. The operational gas inlet pressure and the gas rate. The combustion performance as described in "Check the Combustion Performance" below. Competence to carry out checking combustion performance BS 6798 "Specification for Installation & Maintenance of Gas Fired Boilers not ex ceeding 70kWh" advises that:- The person carrying out a combustion measurement should have been assessed as competent in the use of a flue gas analyser and the inter pretation of the results. The flue gas analyser used should be one meeting the requirements of BS 7927 or BS-EN50379-3 and be calibrated in accordance with the an alyser manufacturers’ requirements. Competence can be demonstrated by satisfactory completion of the CPA1 ACS assessment, which covers the use of electronic portable combustion gas analysers in accordance with BS 7967, Parts 1 to 4. Check the Combustion Performance (CO/CO2 ratio) Set the boiler to operate at maximum rate. See Checking combustion - chimney sweep mode, page 49 for details. Combi 2
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10.2 Maintenance message The purpose of this function is to warn the user that the boiler requires maintenance. flashes, When the letters SVC appear on the screen and the symbol the boiler requires maintenance. Contact your installer. The boiler is delivered with this function disabled. Proceed as follows to enable notifications on the display: 1. Go to the settings menu; 2. 3. Enable setting AP010. Apply the AP011 setting by entering the number of hours the boiler has been in operation (from the moment the boiler was first supplied with electric power irrespective of the number of times the burner has been switched on and off). 4. Enter the number of burner start-up hours using the AP009 parameter. BO-7763705-7 10.2.1 Service notification When the boiler needs to be serviced, a request message appears on the display. Use the automatic assistance notification for preventative maintenance to reduce interruptions to a minimum. Important Maintenance must be carried out within two months of notification. Important If the modulating thermostat is connected to the boiler, this thermostat can also display the message SERVICE. Consult the thermostat manual. Important Reset SERVICE notification after maintenance is complete. Fig.69 Maintenance message F1 F1 F1 F2 F3 F4 1. Remove the plug from the combustion test point. 2. Insert the analyser probe. 3. Follow the combustion procedure on page 48 (figure 46). Warning Ensure that both flue test point plugs are in place after checking combustion. Fig.68 Flue adaptor test points PN-0000363 1 2 63 10 Maintenance Combi 2
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F1 F1 F1 F2 F3 F4 F1 F1 F1 F2 F3 F4 10 Maintenance 10.2.2 Resetting the displayed maintenance message 10.2.3 Resetting the upcoming maintenance message Reset the displayed maintenance message once the stated maintenance service has been carried out, as described below: 1. Press the F1 key. 2. Turn the knob until the code 0012 is displayed. 3. Press the F4 key to confirm and reset the maintenance message. Important The maintenance message is only active if parameter AP010 ≠ 0. BO-7763705-9 Reset an upcoming maintenance message once the intermediate maintenance service has been carried out. 1. Navigate to the Counter menu. 2. Press the F4 key to open the menu. 3. Turn the knob until the code SVC is displayed. 4. Press the F4 key to access the maintenance message. 5. Turn the knob until the code 0012 is displayed. 6. Press the F4 key to confirm.. 7. Turn the knob until the code CLR is displayed. 8. Press the F4 key for around 3 seconds, to confirm and reset the maintenance message. The display shows DONE. The maintenance message is reset. 9. Press the F1 key several times to return to the main screen. BO-0000230-15 Fig.70 Resetting displayed message Fig.71 Resetting upcoming message 64 Combi 2
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10 Maintenance 65 Combi 2 10.3 Standard inspection and maintenance operations 10.3.1 Annual Servicing Warning Ensure that the boiler is cool. Ensure that both the gas and electri cal supplies to the boiler are isolated. Caution Always examine any seals or gaskets, replacing where necessary. Where a seal or gasket is supplied with a spare part it should be used, irrespective of the condition of the original. Use only original spare parts that are intended for use with this type of boiler. Important When performing any inspection or maintenance, personal protec tive equipment must be used where appropriate. 1. Ensure that both the gas and electrical supplies to the boiler are iso lated and that the boiler is cool. 2. Remove the case front panel and hinge down the control panel. 3. Carefully examine all seals and gaskets, replacing if necessary. Look for any evidence of leaks or corrosion and if found determine and rectify the cause. 4. Complete the relevant Service Interval Record section of the Bench mark Commissioning Checklist at the rear of this publication and then hand it back to the user.
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Measure the content of O2/CO2 in the flue gas using the measuring equipment. Compare this with the control value. 10.3.6 Checking the automatic air vent Check that the boiler pump venting valve is working. In the event of a leak, replace the valve. 10.3.7 Cleaning the siphon Measure the O2/CO2 contents and the temperature of the flue gases at the flue gas measuring point. To do this, proceed as follows: Heat the water in the boiler to a temperature of approx. 70°C. Unscrew the plug of the flue gas measurement point (exhaust system adaptor). The front panel must be removed to extract the siphon (A). Proceed as described below: Lower the panel (1); Remove the clip (2); Unfasten the pipe from the heat exchanger (3); Remove the siphon (4) and clean it; Replace, if necessary, all the gaskets present; Fill the siphon with water and reposition it in its seat (5). BO-0000208 Fig.72 Dismantling the siphon A 2 4 1 5 10.3.2 Checking the water pressure In order for the boiler to operate correctly, the pressure of the water in the heating circuit, shown on the display, must be between 1.0 and 1.5 bar. If necessary, restore the water pressure as described in the chapter entitled "Filling the installation". 10.3.3 Checking the expansion vessel Check the expansion vessel and replace it if necessary. Check its pre-charge every year and restore the pressure to 1 bar if necessary. 10.3.4 Checking the flue gas discharge and the air supply Check the entire line of flue gas pipes, in particular the tightness of the flue gas evacuation and combustion air intake connections. 10.3.5 Checking the combustion 10 Maintenance 66 Combi 2 3
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13. 14. The burner does not require any maintenance, it is self-cleaning. Check that there are no cracks and/or other damage on the surface of the dismantled burner. If the burner is damaged, replace it. Replacing the burner flange gasket. Check the front insulation panel for cracks, damage, moisture, ageing and deformation. Replace the insulation panel if in doubt. To clean the upper part of the heat exchanger (combustion chamber), use a vacuum cleaner and a brush with plastic bristles. Thoroughly clean with the vacuum cleaner again without the end piece (brush). Make sure (using a mirror, for example) that there is no visible dust residue. Vacuum up any residue. It is forbidden to clean the combustion chamber with any unauthorised chemical products and, in particular, ammonia, hydrochloric acid, sodium hydroxide (caustic soda) etc. Generously wet the surfaces to be cleaned using a manual sprayer containing a solution of water and vinegar. Do not use it on excessively hot surfaces (max. 40 °C). Wait approx. 7-8 minutes then brush the surface without rinsing it. Repeat the process. Wait another 8 minutes and then brush again. If the result is not satisfactory, repeat the operation. Rinse with water. The water will flow out of the heat exchanger through the condensate drain siphon. Wait another 20 minutes and use a powerful water jet to wash away the dirt particles. Do not aim the water jet directly at the insulating surface on the rear of the heat exchanger. To re-assemble, perform the above actions in reverse order. Caution The maximum tightening torque of the four M6 nuts (D) fastening the flange is 5 Nm ( +/- 0.5). 10. 11. 12. 15. 16. 17. 18. 19. 20. 10.3.8 Checking the burner and cleaning the heat exchanger Proceed as described below for cleaning: 1. Isolate the unit from the power supply (disconnect the boiler from the main power supply). 2. Cut off the gas supply to the boiler. 3. Close the hydraulic cocks. 4. Remove the front panel. 5. Remove the entire air-gas unit, unscrew the screw (A) and the clip (B) located between the fan and the gas valve. 6. Remove the silencer (C). 7. Unscrew the 4 M6 locknuts (D) on the burner door. 8. Check the condition of the detection/ignition electrode. Replace the electrode if necessary. 9. Check the condition of the burner, the gasket and the insulation panel. Fig.73 Removing the air-gas system A B C BO-7696477-01 D Warning Dust released from the front insulation panel and the rear insulation panel can harm your health. Clean the heat exchanger with only a soft brush and water. Avoid contact with the rear and front plate Do not use steel brushes or compressed air. Danger In the case of maintenance/disassembly of the boiler combustion circuit installed on a collective flue in positive pressure, take the necessary precautions to prevent the fumes from other boilers installed on the collective flue from entering the room where the boiler is installed. 10 Maintenance 67 Combi 2
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1. Disconnect the power supply to the boiler; 2. Close the domestic water inlet cock; 3. Empty the water from the domestic water circuit by opening a user cock; 4. Remove the clip (1-B) as shown in the figure and remove the cartridge (2-B) containing the filter, taking care not to apply excessive force; 5. Remove any impurities and deposits from the filter; 6. Fit the filter back inside the cartridge and reinsert it into its seat, securing it with its clip; Notice If the O-rings in the water unit need to be replaced and/or cleaned, do not use oil or grease as a lubricant, but only Molykote 111. Caution Do not use tools to remove components from inside the water unit (e.g. filter). For certain user areas, where domestic water hardness values exceed 20 °F (200 mg of calcium carbonate per litre of water) it is recommended to install a polyphosphate batcher or equivalent system complying with the prevailing standards. CLEANING THE DOMESTIC WATER FILTER The domestic water filter is housed inside a suitable removable cartridge positioned on the cold water inlet (B). Proceed as follows to clean: 10.3.10 Water unit Fig.74 Electrode distance BO-7696477-2 8.0 1 ± 4.5 0.5 ± Verify the distances between the electrode and the burner and between 10.3.9 Electrode distances 10 Maintenance 68 Combi 2
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10.3.11 Removing limescale The domestic water circuit can be cleaned after removing the water-water heat exchanger from its seat, by unscrewing the two front screws (A). For the cleaning operations, you must: Disconnect the power supply to the boiler. Cut off the gas supply to the boiler. Close the heating system return and flow cocks. Empty the water contained in the heating circuit by opening the cock (E). Close the domestic water inlet cock. Empty the water from the domestic water circuit by opening a user cock. Remove the exchanger by unscrewing the two screws (A). Clean the plate heat exchanger with a descaling product (e.g. formic or citric acid with a pH value of around 3). After cleaning, rinse thoroughly under running water. To re-assemble, perform the above actions in reverse order. Caution The maximum tightening torque for the two fastening screws (A) for the plate heat exchanger is 4 Nm. For more information, see Water treatment, page 19 Fig.75 Water unit parts 10 Maintenance 69 Combi 2
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10.4.3 Replacing the 3-way valve To replace the diverter valve, proceed as follows: 1. Disconnect the power supply to the boiler; 2. Close the gas cock; 3. Cut off the gas supply to the boiler. 4. Close the heating system return and flow cocks. 5. Drain the system, if possible only the boiler, using the specific drain cock. 6. Empty the water from the domestic water circuit by opening a user cock. 7. Disconnect any piping connections. 8. Remove the clip (1). 9. Remove the pressure sensor (2). 10. Remove the fixing spring (3). 11. Remove the safety valve (4). 12. Remove the motor fixing spring (5). 13. Remove the motor (6). 14. To re-assemble, perform the above actions in reverse order. Fig.77 Remove pump 10.4.1 Detection/ignition electrode replacement Replace the detection//ignition electrode in the following cases: 1. Ionisation current <4 μA. To do this, activate the "chimney sweep function" (chapter "Combustion settings") and set the boiler to the minimum power. The ionisation value is visible with setting GM008 (chapter "Reading out measured values"). 2. Electrode worn. 3. Distances out of range (chapter “Electrode distance”). To remove the electrode: Disconnect the power supply to the boiler. Cut off the gas supply to the boiler. Remove the front panel on the boiler (case) and remove the electrode pin and the earthing cable. Unscrew the 2 screws on the ignition electrode and remove it. Fit the new electrode with the gasket. To re-assemble, perform the above actions in reverse order. 10.4 Specific maintenance operations 1. Disconnect the power supply to the boiler; 2. Close the gas cock; 3. Close the heating system return and flow cocks. 4. Drain the system, if possible only the boiler, using the specific drain cock (E); 5. Empty the water contained in the domestic water circuit by opening a user cock; 6. Remove the silencer, then loosen the two Allen screws Ø 6 mm (A) securing the heat exchanger and remove it from its seat; 7. Use a natural product (e.g. vinegar) to clean the water-water heat exchanger; 8. To re-assemble, perform the above actions in reverse order. 10.4.2 Dismantling the water-water exchanger The stainless steel plate water-water heat exchanger can be easily removed, as described below: Fig.76 Remove detection/spark ignition electrode PN-0000331 70 10 Maintenance Combi 2
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F1 F1 F1 F2 F3 F4 10.4.5 Replacing the expansion vessel Before replacing the expansion vessel, proceed as detailed below: 1. Disconnect the power supply to the boiler. 2. Close the gas cock. 3. Close the main domestic water tap. 4. Close the heating system return and flow cocks. 5. Open the boiler drain cock. The expansion vessel is inside the boiler on the side, to the right. 10.4.6 Replacing the PCB After replacing the main board, power up the boiler electrically. Parameters CN1 and CN2 will automatically appear on the display. Modify the parameters with the data shown on the serial number plate: Turn knob to modify the parameters; Press the F4 key to store the set value. Parameters CN1 and CN2 can also be accessed from the main menu to carry out the replacement. Press the two external buttons on the control panel simultaneously for about 40 seconds. Caution Please note that resetting the CN1 and CN2 settings with data on the data plate deletes any previous setting. If changing the gas, for example, remember to set the correct calibration for the gas valve. BO-7763705-8 Fig.79 Accessing the parameters 10.4.4 Pump - replacement 10 Maintenance 71 Combi 2 Warning Take precautions to protect other components from water damage when removing the pump and auto air vent. 1. Hinge the control box down. 2. Close the flow and return isolation taps and drain the boiler primary circuit. Disconnect the electrical plugs from the pump motor. 3. Undo the screws securing the body to the pipe and manifold and draw the pump forward to remove. 4. Examine the ‘O’ ring seals on the return pipe and manifold, replacing if necessary. 5. Reassemble in reverse order. Fig.78 Removing the pump PN-0000238
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11 Troubleshooting 11.1 Temporary and permanent faults The codes on the display indicate two types of fault: volatile and permanent. The first item shown on the display is a letter followed by a two-digit number. The letter indicates the type of fault: temporary (H) or permanent (E). The number indicates the group in which the fault that has occurred is classified according to its impact on safe and reliable operation. The second item shown flashes alternately with the first and consists of a two-digit number that indicates the type of fault which has occurred (see the following fault tables). TEMPORARY FAULT (A/H.x.x.) A temporary fault is shown on the display by the letter “A” or “H” followed by a number (group). A temporary fault is a type of fault that does not cause a permanent stoppage of the boiler. It has the following characteristics: A: The appliance continues to operate. It disappears as soon as the cause has been resolved. H: Disappears when the error condition is removed, in some cases even after 10 minutes. PERMANENT FAULT (E.x.x) A permanent fault is shown on the display by the letter "E" followed by a number (group). Press the RESET button for one second. If faults are shown frequently, contact our authorised technical assistance centre. E: Stoppage, reset required.. 11.2 Error codes 11 Troubleshooting 72 Combi 2 Tab.32 List of temporary faults DISPLAY DESCRIPTION OF TEMPORARY FAULTS CAUSE – Check/Solution An installer is required for most checks and solu tions. Group code Specific code H.00 .42 Pressure sensor open/faulty SENSOR/CONNECTION PROBLEM Check the operation of the pressure sensor Check the sensor/PCB connection H.01 .00 Temporary communication failure in the PCB The error is resolved automatically H.01 .05 Maximum temperature difference value between flow and return reached. INSUFFICIENT CIRCULATION Check the boiler/installation circulation Activate a manual venting cycle Check the installation pressure OTHER CAUSES Check the cleanliness of the exchanger Check the operation of the temperature sensors Check the temperature sensor connection H.01 .08 Flow temperature increase in heating mode too quick. INSUFFICIENT CIRCULATION Check the boiler/installation circulation Activate a manual venting cycle Check the installation pressure Check the operation of the pump OTHER CAUSES Check the cleanliness of the exchanger Check the operation of the temperature sensors Check the temperature sensor connection H.01 .14 Maximum flow or return temperature value reached. INSUFFICIENT CIRCULATION Check the boiler/installation circulation Activate a manual venting cycle
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11 Troubleshooting 73 Combi 2 H.01 .18 No water circulation (temporary). INSUFFICIENT CIRCULATION Check the installation pressure Activate a manual venting cycle Check the operation of the pump Check the boiler/installation circulation TEMPERATURE SENSOR ERROR Check the operation of the temperature sensors Check the temperature sensor connection H.01 .21 Flow temperature increase during domestic hot water operation too fast. INSUFFICIENT CIRCULATION Check the installation pressure Activate a manual venting cycle Check the operation of the pump Check the boiler/installation circulation TEMPERATURE SENSOR ERROR Check the operation of the temperature sensors Check the connection of the temperature sensors H.02 .00 Reset in progress. It resolves itself H.02 .02 Waiting for configuration settings to be entered (CN1,CN2). CN1/CN2 CONFIGURATION MISSING Configure CN1/CN2 H.02 .03 Configuration settings (CN1,CN2) not entered correc tly. Check configuration CN1/CN2 Configure CN1/CN2 correctly DISPLAY DESCRIPTION OF TEMPORARY FAULTS CAUSE – Check/Solution An installer is required for most checks and solu tions. Group code Specific code H.02 .04 PCB settings cannot be read. MAIN PCB ERROR Configure CN1/CN2 Replace the main PCB H.02 .05 Setting memory not compatible with the boiler PCB ty pe. Contact the Service Network H.02 .07 Low pressure in heating circuit (water filling required). Check the installation pressure and restore Check the expansion vessel pressure Check for boiler/installation leaks H.02 .09 Partial stoppage of the boiler (antifreeze function acti ve) SIGNAL INDICATING BLOCKING INPUT Contact X15 open, check connected devices Parameter configuration error: Check AP001 H.02 .10 Total stoppage of the boiler (antifreeze function not active) SIGNAL INDICATING BLOCKING INPUT Contact X15 open, check connected devices Parameter configuration error: Check AP001 H.02 .70 External unit heat recovery test failed PCB accessory error SCB-09 Check the device connected to contact X9 H.03 .00 No identification data for boiler safety device. MAIN PCB ERROR Contact the Service Network H.03 .02 Temporary flame loss ELECTRODE PROBLEM Check the electrode connection and wiring Check the condition of the electrode GAS SUPPLY Check the gas supply pressure Check the gas valve calibration FLUE GAS PIPES Check the pipes and the terminal H.03 .05 Power supply voltage too low Check the mains voltage H.03 .54 Temporary flame loss Shutdown due to the power supply voltage being too low ELECTRODE PROBLEM Check the electrode electrical connections Check the condition of the electrode GAS SUPPLY Check the gas inlet pressure Check the gas valve calibration FLUE GAS EXHAUST PIPE Check the air intake and flue gas exhaust termi nal Check the power supply voltage
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11 Troubleshooting 74 Combi 2 Tab.33 List of permanent faults (boiler stoppage, reset required) DISPLAY DESCRIPTION OF PERMANENT FAULTS (RESET) CAUSE – Check/Solution An installer is required for most checks and solu tions. Group code Specific code E.00 .04 Return temperature sensor disconnected SENSOR/CONNECTION PROBLEM Check the operation of the temperature sensor Check the sensor/PCB connection E.00 .05 Return temperature sensor short circuited SENSOR/CONNECTION PROBLEM Check the operation of the sensor Check the sensor/PCB connection E.00 .16 DHW tank temperature sensor not connected SENSOR OPEN Check the operation of the sensor Check the sensor/PCB connection When removing a domestic hot water tank, set parameter DP150=1 E.00 .17 DHW tank temperature sensor short-circuited SENSOR CLOSED Check the operation of the sensor Check the sensor/PCB connection E.00 .20 The flue gas temperature sensor is not connected or measured a temperature below the range SENSOR OPEN Check the operation of the sensor Check the sensor/PCB connection E.00 .21 The flue gas temperature sensor has short-circuited or measured a temperature above the range SENSOR CLOSED Check the operation of the sensor Check the sensor/PCB connection E.01 .04 Flame loss detected five times in 24 hours GAS SUPPLY Check the gas supply pressure Check the gas valve calibration ELECTRODE PROBLEM Check the electrode connection and wiring Check the condition of the electrode FLUE GAS PIPES Check the air intake and flue gas exhaust pipes EXCHANGER ON FLUE GAS SIDE BLOCKED Check the cleanliness of the exchanger MAINS VOLTAGE Check the power supply voltage E.01 .12 Temperature measured by return sensor greater than flow temperature SENSOR/CONNECTION PROBLEM Check that the sensors are positioned the correct way around Check that the flow sensor is in the correct posi tion Check the return temperature in the boiler Check the operation of the sensors E.01 .17 No water circulation (permanent) INSUFFICIENT CIRCULATION Check the installation pressure Activate a manual venting cycle Check the operation of the pump Check the boiler/installation circulation SENSOR ERROR Check the operation of the temperature sensors Check the temperature sensor connection E.01 .20 Maximum flue gas temperature reached EXCHANGER ON FLUE GAS SIDE BLOCKED Check the cleanliness of the exchanger E.02 .13 Total stoppage of the boiler (antifreeze function not active) SIGNAL INDICATING BLOCKING INPUT Contact X15 open, check connected devices Parameter configuration error: Check setting AP001 E.02 .17 Permanent communication failure in the PCB MAIN PCB ERROR Check for any electromagnetic interference Contact the Service Network
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11 Troubleshooting 75 Combi 2 DISPLAY DESCRIPTION OF PERMANENT FAULTS (RESET) CAUSE – Check/Solution An installer is required for most checks and solu tions. Group code Specific code E.04 .03 Maximum flow temperature exceeded or flow tempe rature sensor short circuited INSUFFICIENT CIRCULATION Check the boiler/installation circulation Activate a manual venting cycle Check the operation of the sensors E.04 .08 Maximum safe temperature value reached INSUFFICIENT CIRCULATION Check the pressure in the installation Switch on the manual degassing function Check that the pump is working Check the circulation in the boiler/installation OTHER POSSIBLE CAUSES Check the safety thermostat connection Check that the safety thermostat is working cor rectly E.04 .10 Burner failed to ignite after 4 attempts GAS SUPPLY Check the gas supply pressure Check the gas valve electrical connection Check the gas valve calibration Check the operation of the gas valve ELECTRODE PROBLEM Check the electrode electrical connections Check the electrode condition OTHER CAUSES Check the operation of the fan Check the condition of the flue gas exhaust (bloc kages) E.04 .12 Ignition failure for monitoring parasitic flame Check the ground circuit Check the power supply voltage Check the electrode conditions E.04 .13 Fan blade blocked or maximum rpm exceeded FAN/PCB PROBLEM Check the PCB-fan connection Check the fan operation E.04 .17 Fault in gas valve control circuit MAIN PCB ERROR Check the electrical connections for the gas valve E.04 .18 The flow temperature is below the minimum tempera ture or the flow temperature sensor is not connected SENSOR/CONNECTION PROBLEM Check the sensor/PCB connection Check the operation of the sensor E.04 .23 Communication internal stoppage Switch the power supply off and on again and then RESET E.04 .29 Communication internal stoppage Switch the power supply off and on again and then RESET E.04 .254 Fault in gas valve control circuit MAIN PCB ERROR Check the electrical connections E.02 .35 Critical safety device disconnected COMMUNICATION FAULT Start the auto-detect function (parameter AD) Check the devices connected to contact X9 E.02 .39 Minimum pressure not reached after 6 minutes of au tomatic filling AUTOMATIC FILLING ERROR Check automatic filling is working E.02 .47 Connection to external device unsuccessful ELECTRICAL CONNECTION ERROR Start the auto-detect function (parameter AD)) Check the electrical connections of external devi ces. E.04 .01 Flow temperature sensor short circuited SENSOR/CONNECTION PROBLEM Check the sensor/PCB connection Check the operation of the sensor E.04 .02 Flow temperature sensor disconnected SENSOR/CONNECTION PROBLEM Check the sensor/PCB connection Check the operation of the sensor
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Important When connecting a Room Unit/Control Unit to the boiler, the code “254” is always shown in the event of a fault.. Read the fault code shown on the boiler display. 11 Troubleshooting 76 Combi 2 A.02 .06 Low pressure in heating circuit Check the installation pressure and restore Check the expansion vessel pressure Check for boiler/installation leaks A.02 .36 Functional device disconnected COMMUNICATION FAULT Start the auto-detect function (parameter AD) Check the devices connected to contact X9 A.02 .37 Passive functional device disconnected COMMUNICATION FAULT Start the auto-detect function (parameter AD) Check the devices connected to contact X9 A.02 .45 Connection error COMMUNICATION FAULT Start the auto-detect function (parameter AD)) A.02 .46 Device priority error COMMUNICATION FAULT Start the auto-detect function (parameter AD)) A.02 .48 Unit function configuration error ELECTRICAL CONNECTION ERROR Start the auto-detect function (parameter AD)) Check electrical connections of external devices A.02 .49 Failed node initialisation ELECTRICAL CONNECTION ERROR Start the auto-detect function (parameter AD)) Check electrical connections of external devices A.02 .54 Open Therm bus power supply error Check the devices connected to contact X17 - Terminal board M2 (7-8) A.02 .55 Incorrect or missing serial number Contact the Service Network A.02 .76 Internal memory reserved for full customisation of set tings. No further changes can be made Contact the Service Network Tab.34 List of warnings DISPLAY DESCRIPTION OF WARNINGS BEFORE A FAULT IS DETECTED CAUSE – Check/Solution Group code Specific code A.00 .28 Solar temperature sensor is either removed or measures a temperature below range Check the solar temperature sensor wiring. Re place the sensor if necessary. In case of removal of the solar tank, set the parameter DP150=1. A.00 .29 Solar temperature sensor is either shorted or measures a temperature above range Check the solar temperature sensor wiring. Re place the sensor if necessary. A.00 .34 Outdoor temperature sensor expected but not detec ted OUTDOOR SENSOR NOT DETECTED Enter the correct value of the parameter AP091 Connect the outdoor sensor Outdoor sensor is not connected correctly
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Warning Only qualified professionals are authorised to work on the boiler and the heating system. Proceed as follows to disassemble the boiler: 1. Switch off the boiler. 2. Disconnect the power supply to the boiler. 3. Close the gas valve to the boiler. 4. Close the inlet cock for domestic cold water in the boiler. 5. Tap domestic water by opening a cock to relieve pressure from the domestic water circuit. 6. Drain the heating installation. Warning If the boiler was in operation, wait for the water contained in the heating installation to cool down. 7. Remove the pipe connecting the boiler to the chimney and close the connection with a plug. 8. Unscrew the hydraulic and gas connections in the lower part of the boiler. Warning Moving the boiler is a job for two people. 12.2 Recommissioning Warning Only qualified professionals are authorised to work on the boiler and the heating system. Should you need to recommission the boiler, follow the instructions for disassembly in the reverse order. 12 Decommissioning 12.1 Disassembly 77 12 Decommissioning Combi 2
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13 Disposal 13.1 Disposal and recycling The appliance is composed of multiple components made from various different materials, such as steel, copper, plastic, fibreglass, aluminium, rubber, etc.. These materials may be highly pollutant. This means that the boiler must be disposed of correctly by contacting staff at the nominated disposal facility or by taking it to a centre that is authorised to dispose of bulky waste (domestic appliances). Warning Removal and disposal of the boiler must be carried out by a qualified installer in accordance with local and national regulations. Fig.80 Recycling MW-3000179-03 Fig.81 Cutting the power supply MW-0000149-1 13 Disposal 78 Combi 2
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www.centralheating.co.uk www.hhic.co.uk Benchmark Commissioning & Warranty Validation Service Record It is a requirement that the boiler is installed and commissioned to the manufacturers’ instructions and the data fields on the commissioning checklist completed in full. To instigate the boiler warranty the boiler needs to be registered with the manufacturer within one month of the installation. The warranty rests with the end-user (consumer), and they should be made aware it is ultimately their responsibility to register with the manufacturer, within the allotted time period. It is essential that the boiler is serviced in line with the manufacturers’ recommendations, at least annually. This must be carried out by a competent Gas Safe registered engineer. The service details should be recorded on the Benchmark Service and Interim Boiler Work Record and left with the householder. Failure to comply with the manufacturers’ servicing instructions and requirements will invalidate the warranty. This Commissioning Checklist is to be completed in full by the competent person who commissioned the boiler as a means of demonstrating compliance with the appropriate Building Regulations and then handed to the customer to keep for future reference. Failure to install and commission according to the manufacturers’ instructions and complete this Benchmark Commissioning Checklist will invalidate the warranty. This does not affect the customer’s statutory rights. © Heating and Hotwater Industry Council (HHIC)
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© Heating and Hotwater Industry Council (HHIC) www.centralheating.co.uk GAS BOILER SYSTEM COMMISSIONING CHECKLIST & WARRANTY VALIDATION RECORD Address: Boiler make and model: Boiler serial number: Commissioned by (PRINT NAME): Gas Safe registration number: Company name: Telephone number: Company email: Company address: Commissioning date: Heating and hot water system complies with the appropriate Building Regulations? Yes Boiler Plus requirements (tick the appropriate box(s)) Boiler Plus option chosen for combination boiler in ENGLAND Weather compensation Smart thermostat with automisation and optimisation Load compensation Flue Gas Heat Recovery Time and temperature control to hot water Cylinder thermostat and programmer/timer Combination boiler Zone valves pre-existing Fitted Not required Thermostatic radiator valves pre-existing Fitted Not required Automatic bypass to system pre-existing Fitted Not required pre-existing Fitted Not required Water quality instructions Yes What system cleaner was used? Brand: Product: What inhibitor was used? Brand: Product: pre-existing Fitted Not required CENTRAL HEATING MODE measure and record (as appropriate) Gas rate (for combination boilers complete DHW mode gas rate) m3/hr or ft3/hr Central heating output left at factory settings? Yes No If no, what is the maximum central heating output selected? kW Dynamic gas inlet pressure mbar °C Central heating return temperature °C System correctly balanced/rebalanced? Yes COMBINATION BOILERS ONLY Is the installation in a hard water area (above 200ppm)? Yes No Water scale reducer/softener pre-existing Fitted Not required Brand: Product: Yes No If yes- DHW expansion vessel pre-existing Fitted Not required Pressure reducing valve pre-existing Fitted Not required DOMESTIC HOT WATER MODE Measure and record Gas rate m3/hr or ft3/hr Dynamic gas inlet pressure at maximum rate mbar Cold water inlet temperature °C Hot water has been checked at all outlets Yes Temperature °C CONDENSATE DISPOSAL The condensate drain has been installed in accordance with the manufacturers’ instructions and/or BS5546/BS6798 Yes Point of termination Internal External (only where internal termination impractical) Method of disposal Gravity Pumped ALL INSTALLATIONS Record the following At max rate: CO ppm CO2 % CO/CO2 Ratio At min rate (where possible) CO ppm CO2 % CO/CO2 Ratio instructions, and readings are correct? Yes The operation of the boiler and system controls have been demonstrated to and understood by the customer Yes The manufacturers’ literature, including Benchmark Checklist and Service Record, has been explained and left with the customer Yes Commissioning Engineer’s signature Customer’s signature Time, temperature control and boiler interlock provided for central heating and hot water Yes
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© Heating and Hotwater Industry Council (HHIC) www.centralheating.co.uk SERVICE & INTERIM BOILER WORK RECORD It is recommended that your boiler and heating system are regularly serviced and maintained, in line with manufacturers’ instructions, and that the appropriate service / interim work record is completed. Service provider When completing a service record (as below), please ensure you have carried out the service as described in the manufacturers’ instructions. Always use the SERVICE/INTERIM WORK ON BOILER delete as appropriate Date: Engineer name: Company name: Telephone No: Gas Safe registration No: Max rate CO ppm CO² % CO/CO² Min rate CO ppm CO² % CO/CO² undertaken in accordance with manufacturers’ instructions, and readings are correct?” yes Gas rate: m3/h OR ft3/h delete as appropriate Yes No System inhibitor concentration has been checked and appropriate action taken, in accordance with BS 7593 and boiler manufacturers’ instructions. * yes n/a Comments: Signature: instructions and BS 7593. It is only acceptable to not have undertaken this if the service engineers attendance visit was in between annual services to attend a non-water facing component. instructions and BS 7593. It is only acceptable to not have undertaken this if the service engineers attendance visit was in between annual services to attend a non-water facing component. instructions and BS 7593. It is only acceptable to not have undertaken this if the service engineers attendance visit was in between annual services to attend a non-water facing component. instructions and BS 7593. It is only acceptable to not have undertaken this if the service engineers attendance visit was in between annual services to attend a non-water facing component. instructions and BS 7593. It is only acceptable to not have undertaken this if the service engineers attendance visit was in between annual services to attend a non-water facing component. instructions and BS 7593. It is only acceptable to not have undertaken this if the service engineers attendance visit was in between annual services to attend a non-water facing component. SERVICE/INTERIM WORK ON BOILER delete as appropriate Date: Engineer name: Company name: Telephone No: Gas Safe registration No: Max rate CO ppm CO² % CO/CO² Min rate CO ppm CO² % CO/CO² undertaken in accordance with manufacturers’ instructions, and readings are correct?” yes Gas rate: m3/h OR ft3/h delete as appropriate Yes No System inhibitor concentration has been checked and appropriate action taken, in accordance with BS 7593 and boiler manufacturers’ instructions. * yes n/a Comments: Signature: SERVICE/INTERIM WORK ON BOILER delete as appropriate Date: Engineer name: Company name: Telephone No: Gas Safe registration No: Max rate CO ppm CO² % CO/CO² Min rate CO ppm CO² % CO/CO² undertaken in accordance with manufacturers’ instructions, and readings are correct?” yes Gas rate: m3/h OR ft3/h delete as appropriate Yes No System inhibitor concentration has been checked and appropriate action taken, in accordance with BS 7593 and boiler manufacturers’ instructions. * yes n/a Comments: Signature: SERVICE/INTERIM WORK ON BOILER delete as appropriate Date: Engineer name: Company name: Telephone No: Gas Safe registration No: Max rate CO ppm CO² % CO/CO² Min rate CO ppm CO² % CO/CO² undertaken in accordance with manufacturers’ instructions, and readings are correct?” yes Gas rate: m3/h OR ft3/h delete as appropriate Yes No System inhibitor concentration has been checked and appropriate action taken, in accordance with BS 7593 and boiler manufacturers’ instructions. * yes n/a Comments: Signature: SERVICE/INTERIM WORK ON BOILER delete as appropriate Date: Engineer name: Company name: Telephone No: Gas Safe registration No: Max rate CO ppm CO² % CO/CO² Min rate CO ppm CO² % CO/CO² undertaken in accordance with manufacturers’ instructions, and readings are correct?” yes Gas rate: m3/h OR ft3/h delete as appropriate Yes No System inhibitor concentration has been checked and appropriate action taken, in accordance with BS 7593 and boiler manufacturers’ instructions. * yes n/a Comments: Signature: SERVICE/INTERIM WORK ON BOILER delete as appropriate Date: Engineer name: Company name: Telephone No: Gas Safe registration No: Max rate CO ppm CO² % CO/CO² Min rate CO ppm CO² % CO/CO² undertaken in accordance with manufacturers’ instructions, and readings are correct?” yes Gas rate: m3/h OR ft3/h delete as appropriate Yes No System inhibitor concentration has been checked and appropriate action taken, in accordance with BS 7593 and boiler manufacturers’ instructions. * yes n/a Comments: Signature:
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© Heating and Hotwater Industry Council (HHIC) www.centralheating.co.uk SERVICE & INTERIM BOILER WORK RECORD It is recommended that your boiler and heating system are regularly serviced and maintained, in line with manufacturers’ instructions, and that the appropriate service / interim work record is completed. Service provider When completing a service record (as below), please ensure you have carried out the service as described in the manufacturers’ instructions. Always use the SERVICE/INTERIM WORK ON BOILER delete as appropriate Date: Engineer name: Company name: Telephone No: Gas Safe registration No: Max rate CO ppm CO² % CO/CO² Min rate CO ppm CO² % CO/CO² undertaken in accordance with manufacturers’ instructions, and readings are correct?” yes Gas rate: m3/h OR ft3/h delete as appropriate Yes No System inhibitor concentration has been checked and appropriate action taken, in accordance with BS 7593 and boiler manufacturers’ instructions. * yes n/a Comments: Signature: instructions and BS 7593. It is only acceptable to not have undertaken this if the service engineers attendance visit was in between annual services to attend a non-water facing component. instructions and BS 7593. It is only acceptable to not have undertaken this if the service engineers attendance visit was in between annual services to attend a non-water facing component. instructions and BS 7593. It is only acceptable to not have undertaken this if the service engineers attendance visit was in between annual services to attend a non-water facing component. instructions and BS 7593. It is only acceptable to not have undertaken this if the service engineers attendance visit was in between annual services to attend a non-water facing component. instructions and BS 7593. It is only acceptable to not have undertaken this if the service engineers attendance visit was in between annual services to attend a non-water facing component. instructions and BS 7593. It is only acceptable to not have undertaken this if the service engineers attendance visit was in between annual services to attend a non-water facing component. SERVICE/INTERIM WORK ON BOILER delete as appropriate Date: Engineer name: Company name: Telephone No: Gas Safe registration No: Max rate CO ppm CO² % CO/CO² Min rate CO ppm CO² % CO/CO² undertaken in accordance with manufacturers’ instructions, and readings are correct?” yes Gas rate: m3/h OR ft3/h delete as appropriate Yes No System inhibitor concentration has been checked and appropriate action taken, in accordance with BS 7593 and boiler manufacturers’ instructions. * yes n/a Comments: Signature: SERVICE/INTERIM WORK ON BOILER delete as appropriate Date: Engineer name: Company name: Telephone No: Gas Safe registration No: Max rate CO ppm CO² % CO/CO² Min rate CO ppm CO² % CO/CO² undertaken in accordance with manufacturers’ instructions, and readings are correct?” yes Gas rate: m3/h OR ft3/h delete as appropriate Yes No System inhibitor concentration has been checked and appropriate action taken, in accordance with BS 7593 and boiler manufacturers’ instructions. * yes n/a Comments: Signature: SERVICE/INTERIM WORK ON BOILER delete as appropriate Date: Engineer name: Company name: Telephone No: Gas Safe registration No: Max rate CO ppm CO² % CO/CO² Min rate CO ppm CO² % CO/CO² undertaken in accordance with manufacturers’ instructions, and readings are correct?” yes Gas rate: m3/h OR ft3/h delete as appropriate Yes No System inhibitor concentration has been checked and appropriate action taken, in accordance with BS 7593 and boiler manufacturers’ instructions. * yes n/a Comments: Signature: SERVICE/INTERIM WORK ON BOILER delete as appropriate Date: Engineer name: Company name: Telephone No: Gas Safe registration No: Max rate CO ppm CO² % CO/CO² Min rate CO ppm CO² % CO/CO² undertaken in accordance with manufacturers’ instructions, and readings are correct?” yes Gas rate: m3/h OR ft3/h delete as appropriate Yes No System inhibitor concentration has been checked and appropriate action taken, in accordance with BS 7593 and boiler manufacturers’ instructions. * yes n/a Comments: Signature: SERVICE/INTERIM WORK ON BOILER delete as appropriate Date: Engineer name: Company name: Telephone No: Gas Safe registration No: Max rate CO ppm CO² % CO/CO² Min rate CO ppm CO² % CO/CO² undertaken in accordance with manufacturers’ instructions, and readings are correct?” yes Gas rate: m3/h OR ft3/h delete as appropriate Yes No System inhibitor concentration has been checked and appropriate action taken, in accordance with BS 7593 and boiler manufacturers’ instructions. * yes n/a Comments: Signature:
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© Copyright All technical and technological information contained in these technical instructions, as well as any drawings and technical descriptions supplied, remain our property and shall not be multiplied without our prior consent in writing. Subject to alterations.
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Baxi Customer Support 0344 871 1545 Opening hours Monday - Friday, 8.00am-6.00pm Weekends and Bank Holidays, 8.30am-2.00pm Please note calls may be recorded for training and monitoring purposes baxi.co.uk Register now to activate your warranty: www.baxi.co.uk/registration For the warranty to be maintained, please make sure... Benchmark checklist is completed Warranty is registered within 30 days The boiler has an annual service 1 2 3 For full terms and conditions, visit www.baxi.co.uk/terms. Failure to adhere to terms and conditions will void your manufacturer’s warranty. Baxi Brooks House, Coventry Road, Warwick, CV34 4LL Please ensure the boiler is installed in accordance with these installation instructions and that you adhere to the Building Regulations. e&oe All descriptions and illustrations provided in this document have been carefully prepared but we reserve the right to make changes and improvements in our products which may affect the accuracy of the information contained in this leaflet. All goods are sold subject to our standard Conditions of Sale which are available on request. 7791868 - 02 - 03122021
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