Baxi
Инструкция Baxi Instruction Baxi Platinum compact Combi installation manual
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Инструкция · Русский · Обновлено: 11 августа 2026 г.
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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 & Boiler Fiche High Efficiency Wall Hung Condensing Gas Boiler Baxi Platinum Compact Combi 25 - 30 - 36
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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 1.1 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 1.2 General safety instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 1.3 Recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 1.4 Specific safety instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 1.4.1 Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9 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 2.2 Additional documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 2.3 Symbols used . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 2.3.1 Symbols used in the manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 2.4 Abbreviations/Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 3 Technical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 3.1 Homologations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 3.1.1 Safety, Performance & Quality. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 3.1.2 Certifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 3.1.3 Gas category . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 3.1.4 Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 3.2 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13 3.2.1 Technical information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13 3.2.2 Technical parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 3.3 Dimensions and connections/clearances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 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 Central heating and domestic hot water production . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 4.2.4 Central heating mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 4.2.5 Domestic hot water mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 4.2.6 Frost protection mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 4.2.7 Pump protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21 4.3 Main components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 4.3.1 List of components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22 4.4 Control panel description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 4.4.1 Description of the control panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 4.5 Standard delivery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 4.5.1 Contents of the carton . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 4.6 Accessories and options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 4.6.1 Optional accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 5 Before installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 5.1 Installation regulations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 5.2 Installation requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25 5.2.1 Gas supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25 5.2.2 Electrical supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25 5.2.3 Hard water area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26 5.2.4 Bypass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26 5.2.5 System control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26 5.2.6 Treatment of water circulating systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 5.2.7 Showers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27 5.2.8 Expansion vessel (CH only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27 5.2.9 Safety pressure relief valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Contents 3
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5.3 Choice of the location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 5.3.1 Location of the boiler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 5.3.2 Bath and shower rooms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29 5.3.3 Ventilation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 5.3.4 Condensate drain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 5.3.5 Clearances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32 5.3.6 Flue/chimney location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 5.3.7 Horizontal flue/chimney systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 5.3.8 Flue/chimney trim . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 5.3.9 Terminal guard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37 5.3.10 Flue/chimney deflector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37 5.3.11 Flue/chimney accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 5.4 Transport . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37 5.5 Unpacking & initial preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 5.5.1 Unpacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 5.5.2 Initial preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 5.6 Connecting diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 5.6.1 Filling information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39 5.6.2 Domestic hot water circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 6 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 6.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 6.2 Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 6.2.1 Fitting the pressure relief discharge pipe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41 6.2.2 Connecting the condensate drain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 6.3 Air supply/flue gas connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 6.3.1 Connecting the flue/chimney . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 6.4 Electrical connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 6.4.1 Making the electrical connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 6.4.2 Connecting outdoor sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 6.4.3 Identifying label . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 6.4.4 Outdoor sensor graph . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 6.4.5 Setting outdoor sensor curve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47 6.5 Filling the installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48 6.5.1 Flushing the system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48 6.5.2 Fill the installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 6.5.3 Filling the condensate trap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48 7 Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 7.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 7.2 Checklist before commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. .49 7.2.1 Preliminary electrical checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 7.2.2 Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49 7.3 Commissioning procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 7.3.1 De-Aeration function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 7.4 Gas settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 7.4.1 Check the operational (working gas inlet pressure and gas rate) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 7.4.2 Checking combustion - chimney sweep mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 7.5 Configuring the system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 7.5.1 System draining . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 7.6 Final instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 7.6.1 Handover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 8 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55 8.1 Use of the control panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 8.1.1 Control panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 8.2 Start up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 8.3 Frost protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 9 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 9.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 9.2 Standard inspection and maintenance operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 9.2.1 Annual Servicing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 9.2.2 Checking the water pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .58 9.2.3 Checking the expansion vessel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 9.2.4 Checking the automatic air vent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 Contents 4
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9.2.5 Checking the burner and cleaning the heat exchanger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 9.3 Specific maintenance instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .59 9.3.1 Detection/spark ignition electrode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59 9.3.2 NTC flue sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .59 9.3.3 Flow and return sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60 9.3.4 Safety overheat thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60 9.3.5 DHW temperature sensor (NTC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60 9.3.6 Pressure Gauge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60 9.3.7 Hall effect sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61 9.3.8 DHW flow regulator and filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .61 9.3.9 Safety pressure relief valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61 9.3.10 Diverter valve motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .62 9.3.11 Expansion vessel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .62 9.3.12 Gas valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .62 9.3.13 Pump - complete . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65 10 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .66 10.1 Error codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66 10.1.1 Initial error fault finding checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66 10.1.2 Display of error codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66 10.2 Fault finding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67 10.2.1 Central heating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67 10.2.2 Domestic hot water . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68 10.2.3 Fault finding solutions sections A to E . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .69 10.2.4 Fault finding solutions sections F to H . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .70 10.2.5 Fault finding solutions sections I to M . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71 11 Decommissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72 11.1 Decommissioning procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .72 12 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .72 12.1 Disposal and recycling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72 13 Spare parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73 13.1 Short parts list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73 14 Appendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .74 14.1 Benchmark commissioning checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75 Service records . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76 Contents 5 14.2 Product fiche. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .78 14.3 Package fiche - boilers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .79 14.4 Package fiche - combination heaters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
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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
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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
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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
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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
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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 Manufacturer's liability 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 Installer's 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 User's 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 Our products are manufactured in compliance with the requirements of all applicable Directives and Regulations. 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:
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2 About this manual 2.1 General This manual is intended for the installer of a Baxi Platinum Compact Combi boiler. 2.2 Additional documentation 2.3 Symbols used 2.3.1 Symbols used in the manual This manual uses various danger levels to draw attention to special in structions. 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 in jury. Caution Risk of material damage. Important Please note: important information. See Reference to other manuals or pages in this manual. 2.4 Abbreviations/Glossary BS British Standard CH Central heating DHW Domestic hot water GB Great Britain HHIC Heating and Hotwater Industry Council Hi Lower heating value (LHV) Hs Higher heating value (HHV) IE Ireland PCU PCB for managing burner operation Pn Nominal output Pnc Condensing output SU Safety PCB 2 About this manual 11 This Installation & Service Manual 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.
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3 Technical specifications 3.1 Homologations 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. 3.1.2 Certifications Tab.1 Certifications CE certificate number NOx class 6 Boiler type C13, C33 3.1.3 Gas category Tab.2 Gas category, type and supply pressure Gas category Gas type Supply pressure (mbar) I2H G20 20 3.1.4 Standards Codes of Practice — refer to the most recent version Tab.3 In GB the following Codes of Practice apply: Standard Scope BS 6891 Gas Installation. BS 5546 Installation of hot water supplies for domestic purposes. BS EN 12828 Heating systems in buildings. 3 Technical specifications 12
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Standard Scope 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. 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. 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. 3.2 Technical data 3.2.1 Technical information Important All data in these sections are nominal and subject to normal production tolerances. Tab.5 General Gas council numbers 47-077-71 47-077-72 Nominal heat input domestic hot water — Maximum rate Net (Qn Hi) kW 25.8 30.9 Gross (Qn Hs) kW 28.6 34.3 3 Technical specifications 13 36.8 40.8 47-077-73 Baxi Platinum Compact Combi 25 30 36
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Nominal heat input central heating — Maxi mum rate Net (Qn Hi) kW 20.6 20.6 Gross (Qn Hs) kW 22.9 22.9 Nominal heat input — Minimum rate Net (Qn Hi) kW 6.2 6.2 Gross (Qn Hs) kW 6.9 6.9 Nominal heat output 80/60°C — domestic hot water — Maximum rate Pn kW 25 30 Nominal heat output 80/60°C — central heat ing — Maximum rate Pn kW 20 20 Nominal heat output 80/60°C — central heat ing — Factory setting Pn kW 20 20 Nominal heat output 80/60°C — Minimum rate Pn kW 6.1 6.1 Nominal heat output 50/30°C — central heat ing — Maximum rate Pnc kW 21.2 21.2 Nominal heat output 50/30°C — central heat ing — Minimum rate Pnc kW 6.7 6.7 Tab.6 Central heating circuit specifications Maximum pressure bar 3 3 Minimum pressure bar 0.5 0.5 Central heating temperature adjustment (±5°C) °C 25 / 80 25 / 80 Expansion vessel water capacity litres 7.0 7.0 Expansion vessel pre charge pressure bar 1.0 1.0 Maximum capacity of central heating system litres 100 100 Primary water content of boiler (unpressurised) litres 2.5 2.5 Tab.7 Domestic hot water circuit specifications Maximum pressure bar 8 8 Dynamic minimum pressure bar 0.5 0.5 Minimum working water flow rate (1) l/min 2.0 2.0 Specific flow rate (D) l/min 10.2 12.2 Domestic hot water temperature range adjustment ±5°C °C 35 / 60 35 / 60 Production of domestic hot water with ΔT = 30°C l/min 12 14.3 Production of domestic hot water with ΔT = 35°C l/min 10.2 12.2 (1) Where low flow taps or fittings are intended to be used in the DHW system connected to the boiler, it is strongly recommended that the DHW flow rate DOES NOT fall below 2.5 l/min. This will ensure reliable operation of the DHW function. Tab.8 Characteristics of combustion Natural gas rate (G20) Qmax m3/h 2.71 3.26 Natural gas rate (G20) Qmin m3/h 0.67 0.67 3 Technical specifications 14 25.8 28.6 6.7 7.4 36 25 25 6.7 26.4 6.7 3 0.5 25/80 7.0 1.0 100 2.5 8 0.5 2.0 15.0 35/60 16.5 15.0 3.81 0.71 Baxi Platinum Compact Combi Baxi Platinum Compact Combi Baxi Platinum Compact Combi Baxi Platinum Compact Combi 25 30 36 25 30 36 25 30 36 25 30 36
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Important Dynamic (nominal) inlet pressure (Natural gas — G20) 20mbar with a CV of 37.78 MJ/m3 Tab.9 Electrical specifications Nominal electrical power supply voltage V 230 230 Nominal electrical power supply frequency Hz 50 50 Nominal power consumption when firing W 68 80 External fuse rating Amp 3 3 Internal fuse rating Amp F2A H250V F2A H250V Important Boiler must be connected to an earth supply. Tab.10 Other specifications Degree of protection against humidity (EN 60529) IP IPX5D IPX5D Dimensions (height / width / depth) mm H 700/W 390/D 285 Tab.11 Connections Gas inlet mm 22 22 Heating flow mm 22 22 Heating return mm 22 22 Cold water inlet mm 15 15 Hot water outlet mm 15 15 Pressure relief discharge mm 15 15 Condensate discharge drain plastic waste pipe mm 21.5 21.5 Tab.12 Clearances Above casing mm 178 178 Below casing (min) mm 200 200 Front — for servicing mm 450 450 Front — for operation mm 5 5 Sides LH mm 5 5 Sides RH mm 5 5 Tab.13 Weights Packaged boiler kg 37 37 Boiler lift weight (dry) kg 30.3 30.3 Installed weight (dry) kg 31.3 31.3 3 Technical specifications 15 230 50 110 3 F2A H250V IPX5D 22 22 22 15 15 15 21.5 178 200 450 5 5 5 37.5 30.5 31.5 Baxi Platinum Compact Combi Baxi Platinum Compact Combi Baxi Platinum Compact Combi Baxi Platinum Compact Combi Baxi Platinum Compact Combi 25 30 36 25 30 36 25 30 36 25 30 36 25 30 36
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Installed weight when filled with water kg 32.5 32.5 3.2.2 Technical parameters Tab.14 Technical parameters for boiler combination heaters Condensing boiler Yes Yes Low-temperature boiler(1) No No B1 boiler No No Cogeneration space heater No No Combination heater Yes Yes Rated heat output Prated kW 20 20 Useful heat output at rated heat output and high tem perature regime(2) P4 kW 20 20 Useful heat output at 30% of rated heat output and low temperature regime P1 kW 6.7 6.7 Seasonal space heating energy efficiency ƞs % 93 93 Useful efficiency at rated heat output and high temper ature regime ƞ4 % 88.0 88.0 Useful efficiency at 30% of rated heat output and low temperature regime ƞ1 % 97.8 97.8 Auxiliary electricity consumption Full load elmax kW 0.028 0.038 Part load elmin kW 0.015 0.015 Standby mode PSB kW 0.003 0.003 Other items Standby heat loss Pstby kW 0.040 0.040 Ignition burner power consumption Pign kW 0 0 Annual energy consumption QHE GJ 62 62 Sound power level, indoors LWA dB 48 48 Emissions of nitrogen oxides NOX mg/kWh 31 31 Domestic hot water parameters Declared load profile XL XL Daily electricity consumption Qelec kWh 0.192 0.196 Annual electricity consumption AEC kWh 42 43 Water heating energy efficiency ƞwh % 90 89 Daily fuel consumption Qfuel kWh 21.174 21.465 Annual fuel consumption AFC GJ 16 17 (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 regime means 60°C return temperature at heater inlet and 80°C feed temperature at heater outlet. 3 Technical specifications 16 32.7 Yes No No No Yes 93 25 25 8.3 88.1 97.8 0.072 0.015 0.003 0.040 0 51 39 77 XL 0.195 43 89 21.559 17 Baxi Platinum Compact Combi Baxi Platinum Compact Combi 25 30 36 25 30 36
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See The back cover for contact details. 3.3 Dimensions and connections/clearances Fig.3 Dimensions and connections / clearances 1 2 3 4 5 6 7 8 9 10 Condensate trap sump Condensate drain Heating circuit water flow Hot water outlet Gas inlet Pressure relief pipe Cold water inlet Heating circuit water return Boiler drain point on flow isolation tap Cable entry points 3 Technical specifications 17 Fig. 3a Flue position
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3.4 Electrical diagram Fig.4 Electrical wiring diagram bk — black br — brown b — blue g — green r — red w — while g/y — green/ yellow Key Description Key Description A Gas valve I Spark ignition electrode B Hall effect sensor J Diverter valve motor C Flue sensor K Pump D Hydraulic pressure switch L Terminal strip E Heating return sensor M Fan F Heating flow sensor N Safety thermostat G DHW NTC sensor O Earth point on boiler chassis H M2 low voltage external control connection P Printed circuit board (PCB) 3 Technical specifications 18 y — yellow
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4 Description of the product 4.1 General description The Baxi Platinum Compact Combi range are fully automatic gas fired wall mounted condensing boilers. They are room sealed and fan assisted and will serve central heating and mains fed domestic hot water. Tab.15 The boiler is set to give a maximum output of :- 25 models 25 kW DHW 21.2 kW CH Pnc (Condensing) 30 models 36 models 30 kW DHW 21.2 kW CH Pnc (Condensing) The boiler is factory set for use on Natural Gas (G20). The boiler is suitable for use only on fully pumped sealed heating systems. Priority is given to domestic hot water. An information label giving details of the model, serial number and Gas Council number is situated on the front middle underside of the outercase and is accessed by swinging forward gently. A Information label The boiler data badge is positioned on the control box and can be seen when the outercase panel is removed. The boiler is intended to be installed in residential / domestic environments on a governed meter supply only. The boiler must be installed with one of the purpose designed flues such as one of the standard horizontal telescopic flue kits detailed in the Flue Accessories and Fitting Guide. Important All systems must be thoroughly cleansed, flushed and treated with inhibitor. Note These installation and servicing instructions must be read in con junction with the Flue Accessories and Fitting Guide supplied in the literature pack. 4.2 Operating principle 4.2.1 Air-gas adjustment The air is drawn in by the fan and gas injected directly at the top of the mixer valve. The fan rotation speed is regulated automatically by the elec tronic board based on temperature adjustment and other parameters. 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 heat exchanger. The mixture is ignited by the spark electrode. 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 con denses 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 flue exhaust. The condensed water is dis charged through a trap. Fig.5 Information label 4 Description of the product 19 36 kW DHW 26.4 kW CH Pnc (Condensing)
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4.2.3 Central heating and domestic hot water production In boilers used for heating and for producing domestic hot water, an inte grated 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 diverter valve. A flow sensor detects that a hot water tap has been turned on and communicates this to the printed circuit board (PCB), which switches the diverter valve to the hot water position and activates the pump. The diverter valve is spring-loaded but only consumes electricity when switching from one position to another. Priority is given to domestic hot water. 4.2.4 Central heating mode With a demand for heating the pump circulates water through the primary circuit. Once the main burner ignites the fan speed controls the gas rate to main tain the heating temperature measured by the temperature sensor. When the flow temperature exceeds the set temperature, a 3 minute delay occurs before the burner relights automatically (anti-cycling). The pump continues to run during this period. When the demand is satisfied the burner is extinguished and the pump continues to run for a period of 3 minutes (Pump Overrun). Key to components 1. Pump with automatic air vent 2. Boiler drain tap 3. Pressure gauge 4. Safety pressure relief valve 5. DHW flow sensor / filter / restrictor 6. DHW priority sensor 7. DHW NTC sensor 8. Hydraulic pressure switch 9. Diverter valve and motor 10. Plate heat exchanger 11. Gas valve 12. Safety thermostat 13. Heating flow sensor 14. Flue sensor 15. Flue adaptor 16. Primary heat exchanger 17. Burner / door assembly 18. Electrode 19. Air / gas collector 20. Heating return sensor 21. Fan 22. Air / gas venturi 23. Expansion vessel Key to connections A Condensate drain B Heating flow C DHW outlet D Gas inlet E Cold water inlet on/off valve and filter F Heating return 4.2.5 Domestic hot water mode Priority is given to the domestic hot water supply. A demand at a tap or shower will override any central heating requirement. The flow of water will operate the Hall Effect Sensor which requests the diverter valve to change position. This will allow the pump to circulate the primary water through the DHW plate heat exchanger. Fig.6 Operating scheme (combi) PN-0000309 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 A B C D E F 4 Description of the product 20
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The burner will light automatically and the temperature of domestic hot wa ter is controlled by the temperature sensor. When the domestic hot water demand ceases the burner will extinguish and the diverter valve will remain in the domestic hot water mode, unless there is a demand for central heating. 4.2.6 Frost protection mode 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. When the boiler temperature falls below 5° C, the boiler will fire until a temperature of 30° C is reached. Important This will not protect the system ! Further protection can be incorporated by using a system frost thermostat. 4.2.7 Pump protection If the boiler has been inactive for a period of 24 hours the pump will auto matically operate for 1 minute to prevent sticking. 4 Description of the product 21
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4.3 Main components 4.3.1 List of components Fig.8 Hydraulic layout 4 15 12 13 20 18 19 14 PN-0000388 21 23 Tab.16 Component descriptions Key Description Key Description Key Description 1 Expansion vessel 9 Flue sensor 17 Flue adaptor 2 Expansion vessel valve 10 Spark ignition electrode 18 Heating flow sensor 3 Primary heat exchanger 11 Control box 19 Safety thermostat 4 DHW plate heat exchanger 12 Condensate trap 20 Water Pressure Switch 5 Pump with automatic air vent 13 Safety pressure relief valve 21 Condensate outlet 6 CH system pressure gauge 14 Gas valve 22 Silencer 7 Fan assembly 15 Diverter valve motor 23 Hall effect sensor 8 Burner / door assembly 16 Boiler controls Fig.7 Component descriptions 4 Description of the product 22
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4.4 Control panel description 4.4.1 Description of the control panel 1 Display 2 Reset button 3 Central heating temperature control 4 Service diagnostic port 5 DHW temperature control 6 System water pressure gauge Display description The following symbols may be seen on the display OFF (frost protection still enabled) Indicates errors that prevent the burner from starting Error — not resettable by user Water pressure too low R Indicates a resettable error Not applicable Not applicable Generic error Burner lit DHW request Heating mode Units for temperature Units for pressure 4.5 Standard delivery 4.5.1 Contents of the carton The boiler is delivered in a carton comprising: Wall hung gas boiler Easy Fill permanent filling link Adey MagnaClean magnetic system filter Wall bracket for fastening the boiler to the wall Clipping bracket for running pipes upwards Fitting kit, including taps Literature pack containing: Installation and service manual User guide Template Flue accessories fitting guide Warranty documentations ErP product and package leaflets Important These installation and service instructions MUST be read in con junction with the flue accessories fitting guide supplied in the liter ature pack. Fig.9 Control panel Fig.10 Display screen R PN-0000336 4 Description of the product 23
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4.6 Accessories and options 4.6.1 Optional accessories The table shows the accessories available for this boiler range. Tab.17 Optional accessories Part number Accessory 7212438 Baxi single channel wired programmable room thermostat 720971601 Baxi room thermostat 720648301 Multifit condensate & PRV combined pump 5121379 Multifit remote secondary PRV kit 248221 Multifit filling loop 7682790 Multifit rear pipework kit 7682545 Multifit pre-plumbing jig 720030501 RF Single Channel Room Thermostat 7212444 Single channel wired timer For flue accessories (elbows, extensions, clamps etc.) refer to the Flue Ac cessories Fitting Guide supplied in the literature pack. Any of the above MUST be fitted ONLY by a qualified competent person. Further details can be found in the relevant sales literature and at www.baxi.co.uk 4 Description of the product 24 7724181 Multifit IFOS In Flue Outdoor Sensor Kit 7775937 Baxi uSense 2 wired smart thermostat 7822453 Baxi uSense 2 Gateway & power adaptor kit 7724260 Multifit IFOS In Flue Outdoor Sensor Kit Extension 7729943 Multifit IFOS Ridge Tile In Flue Outdoor Sensor Kit 7211472 EP Series 1 single channel programmer 7689034 Multifit rigid filling link
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5 Before installation 5.1 Installation regulations 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, 5.2 Installation requirements 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 must 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. 5 Before installation 25
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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. 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. In some cases an additional bypass may be required depending upon system design. 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 is a regulatory requirement within Building Regulations, Part L. 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 26 IMPORTANT: A magnetic system filter is included with the boiler pack. To ensure continued protection of the boiler and system it (or alternative suggested filter - see table) must be fitted on the primary return pipework as close as possible to the boiler after the last radiator in accordance with the instructions supplied with it and BS7593. Failure to install the filter supplied (or alternative suggested filter) correctly will affect the boiler warranty. When the boiler is serviced the filter must be cleaned and inspected in accordance with the manufacturers instruction supplied. It is recommended that the filter lid and drain seals are replaced at each service.
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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. 5.2.7 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 120 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 Discharge pipe 2 Pressure relief valve A 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.11 Discharge pipe PN-0000604 1 1 2 A 5 Before installation 27
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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. 5.3 Choice of the location 5.3.1 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). 5 Before installation 28
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5.3.2 Bath and shower rooms A Zone 0 B Zone 1 C Zone 2 D Window recess Zone 2 E Ceiling F Outside zones Important Where an optional plug-in integral timer, RF receiver or thermostat is NOT FITTED 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). Important A boiler fitted with an optional plug-in integral timer, RF receiver or thermostat CANNOT be fitted in any zone. 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. 5.3.3 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. 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 Before installation 29
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5.3.4 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 Pipework. 2 Insulation. 3 50mm per metre of pipe run — 2.5° minimum run. 4 450mm minimum is applicable to properties up to 3 storeys. For multi-storey building installations consult BS 6798. 5 Boiler. 6 Sink. 7 Pipe must terminate above water level but below surrounding sur face. Cut end at 45°. 8 Holes in the soak-away must face away from the building. 9 500mm mimimum. 10 Basement or similar (heated) 11 Condensate pump 12 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 5 Before installation 30
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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 5 Before installation 31
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5.3.5 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. 5.3.6 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 5 Before installation 32
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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 Property boundary line 2 Terminal assembly 3 Top view rear flue A 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* 5 Before installation 33
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1 Opening window or door 2 Air inlet 3 Plume displacement kit A 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. 5.3.7 Horizontal flue/chimney systems 1 315mm to 500mm 2 Flue trims 3 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) 5 Before installation 34
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35 5 Before installation It is preferrable that only the flue terminal protrudes from the wall. However, where circumstances dictate, it is permissible for the air duct (white tube) to be visible outside the property up to a maximum distance of 100mm (Fig. 18a), providing the flue is adequately supported and conforms to the appropriate sections of B.S.5440:1, the boiler Installation Manual and flue guide. If the flue is greater than 25mm below a balcony, car port or similar the flue may protrude up to a maximum distance of 500mm ‘V’ (Fig. 18b). Where the flue will terminate beyond a balcony, car port or similar and the distance between the flue and underside of the balcony, car port or similar is only 25mm at ‘Z’ it must protrude 100mm ‘Y’ beyond the outer edge (Fig. 18c). Where the flue exits under a balcony, car port or similar in excess of 500mm, the distance between the flue and underside of the balcony, car port or similar MUST be 25mm at ‘Z’ and this can be achieved with the use of elbows (Fig. 18d). It is also a requirement that the flue must protrude 100mm ‘Y’ beyond the outer edge (Fig 18c.) The horizontal 60/100 & 80/125 flue systems, including bends and extensions, are UV stable. If any flue joint is external to the property, seal the joint with silicone sealant suitable for external use, not the tape supplied. The maximum equivalent flue lengths as stated in the appropriate boiler Installation & Service Manual must not be exceeded. The flue must always be installed with a fall of at least 1.5° from the terminal to allow condensate to run back to the boiler. NOTE: For clarity support brackets are not shown in these illustrations. Fig. 18a Fig. 18b
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36 5 Before installation NOTE: For clarity support brackets are not shown in these illustrations. Fig. 18c Fig. 18d
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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. 5.3.8 Flue/chimney trim The flexible flue trims supplied can be fitted on the outer and inner faces of the wall of installation. 5.3.9 Terminal guard 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. 5.3.10 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. 5.3.11 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. 5.4 Transport This product should be lifted and handled by two people. When lifting al ways keep your back straight and wear protective equipment where nec Fig.20 Flexible flue trims PN-0000390 Fig.21 Terminal guard PN-0000460 1 Fig.22 Flue deflector PN-0000461 1 5 Before installation 37 essary. Carrying and lifting equipment should be used as required. e.g. when install in a loft.
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5.5 Unpacking & initial preparation 5.5.1 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: 5.5.2 Initial preparation 1. After considering the site requirements position the fixing template on the wall ensuring it is level both horizontally and vertically. 2. Mark the position of the two most suitable fixing slots for the wall plate. 3. Mark the position of the centre of the flue hole (rear exit). For side flue exit, mark as shown. 4. 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. Drill the wall as previously marked to accept the wall plugs supplied. Secure the wall plate using the fixing screws. 7. Using a spirit level ensure that the plate is level before finally tight ening the screws. Fig.23 Unpacking the boiler Fig.24 Template 150 mm 5 Before installation 38 1. Remove the banding. 2. Open the flaps and remove the wall bracket. 3. Slide the sleeve upwards. 4. Remove the upper tray and installation kit. 5. Remove the upper packing piece. Important Care must be taken to avoid damage from any residual water in the boiler.
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5.6 Connecting diagrams 5.6.1 Filling information The Baxi Platinum Compact Combi is supplied with an "Easy-Fill" permanent filling link. The permanent filling link is a device to allow filling and repressurising of the heating system. The link has been tested and approved to be left connected after use. It is not necessary to remove any temporary loop or oth-er part of the device after filling and repressurising. Filling & repressurising is achieved by the operation of a spring loaded green lever incorporated in the cold mains inlet part of the link. Full fitting and operating instructions are included with the permanent filling link. If not using the "Easy-Fill" permanent filling link normal regulations apply. A Domestic hot water mains inlet B Central heating return C Stop valve D Double check valve (Not supplied) E 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. 5.6.2 Domestic hot water circuit A Boiler B Expansion vessel C Check valve D Pressure reducer E Stop tap F To hot tap G 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.25 "Easy-Fill" permanent filling link PN-0000633 Fig.26 System filling circuit PN-0000347 A B C C D E Fig.27 Circuit plan PN-0000350 A B G C D E F 5 Before installation 39
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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. 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. Baxi cannot accept any responsibility for damage to the boiler if these recom mendations 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 40
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6 Installation 6.1 General 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. Warning Some residual water may escape when removing the sealing caps. Take precautions to avoid damage to components ! 3. Remove the taps, elbow and sealing washers from the fitting kit. The taps and elbow accept the 15mm or 22mm copper tails supplied. 4. Using the sealing washers provided connect the appropriate tap to the heating flow and return, gas supply and mains cold inlet. Connect the elbow to the DHW flow outlet. 5. Always fit the tap with the drain point to the heating flow. 6. 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. The valve and discharge pipe are assembled to the boiler, terminat ing in a threaded male coupling. 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 15mm elbow and nut 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. Complete the discharge pipework and route it to the outside dis charge point. 5. The pipework must be clipped at suitable intervals to support it, com mencing as close to the boiler as possible. Fig.28 Mounting the boiler Fig.30 Pressure relief pipe connection PN-0000632 6 Installation 41 1. Lift the boiler and hook onto the wall bracket. 2. Remove the sealing caps from the connections under the boiler. Fig.29 Connecting the taps
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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 315mm to 500mm 2 Connection assembly 3 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. Measure the distance from the outside wall face to the elbow. This dimension will be known as " X" . 3. 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.31 Pour 300ml of water into flue spigot PN-0000602 Fig.32 Telescopic flue PN-0000462 3 1 2 Fig.33 Flue dimension X PN-0000463 X X 6 Installation 42
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5. To dimension " X" add 40mm. This dimension to be known as "Y" . 1 TOP label 2 Sealing tape 3 Securing screw 4 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. Using the clearance holes in the connection assembly secure it to the terminal assembly using the screws supplied with the telescopic flue. 8. 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 Flue elbow 2 Boiler adaptor 3 Telescopic flue 4 Flue trim 5 Securing screw A Apply the lubricant supplied for ease of assembly (do not use any other type). Ensure flue is fully engaged into elbow. B Apply the lubricant supplied for ease of assembly (do not use any other type). Ensure elbow is fully engaged into boiler adaptor. C 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.34 Flue dimension Y PN-0000464 Y 1 2 1 3 4 Fig.35 Attaching the flue PN-0000465 1 2 3 4 4 5 A B C 6 Installation 43
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6.4 Electrical connections See Electrical supply, page 25 for details of the electrical supply. Warning Check that the total nominal consumption of the accessories con nected to the appliance is less than 1 amp. If it is higher, a relay must be installed between the accessories and the electronic board. 6.4.1 Making the electrical connection Fig.36 Remove terminal cover PN-0000395 1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 G H M2 M1 Outdoor Weather Sensor Low Voltage Controls (OpenTherm) Important When fitting external controls remove the yellow link wire from the Mains Terminal Block M1. Note Consideration must be given to Health and Safety Document 635 (The Electricity at Work Regulations, 1989). 1. Remove the front panel. See Specific maintenance instructions, page 59 to remove the front panel. 2. Hinge down the control box and unclip the terminal block cover. 3. Slacken both gland nuts in the bottom of the boiler lower panel and insert the mains cable and the external control system cable through them. 4. Leave sufficient slack in the cables to allow the control box to be hinged fully open. Tighten both gland nuts. 6 Installation 44
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5. Connect the earth, permanent live and neutral wires to the terminal block. Note Both the permanent live and neutral connections are fused. Key Description Key Description A Fused Spur b Blue B Room Thermostat bk Black C External Clock br Brown D Frost Thermostat g/y Green/Yellow F Pipe Thermostat E Earth G Mains Terminal Block M1 N Neutral H Low Voltage Terminal Block M2 L Live 6. Refer to the instructions supplied with the external control(s). 7. Remove the link between terminals 1 and 2. 8. The 230V supply at terminal 2 must be connected to the thermostat. 9. The switched output from the thermostat must be connect to termi nal 1. Important The 230V switched signal for external controls (frost thermostat — room thermostat — timer) must always be taken from terminal 2 at the boiler. Live, Neutral and Earth to power these controls must be taken from the Fused Spur. 10. Reclip the terminal block cover back into position and hinge back the control box. 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. Preliminary electrical checks Prior to commissioning the boiler preliminary electrical system checks should be carried out. Fig.37 Typical electrical connections PN-0000396 b br b bk g/y 1 N L 2 N N L 230V 230V b br b bk g/y 1 N L 2 N N L E 230V E E E A B A B C D F G G 6 Installation 45
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These should be performed using a suitable meter, and include checks for Earth Continuity, Resistance to Eart, Short Circuit and Polarity. 6.4.2 Connecting 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. 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. 2. Drill & plug the two fixing holes (plugs and screws are supplied with the sensor). Also drill the hole for the sensor wiring. 3. 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. 9. Connect the wires from the sensor to positions 4 & 5 of low voltage terminal block M2. Refit the cover and front panel. 10. Reinstate the electrical supply to the boiler. 11. From the graph determine which is the most appropriate curve for the installation and the expectations of the user. For example if curve 50 is selected, at an outside temperature of 10°C the boiler flow temperature will be 65°C. In the event of the outside tempera ture falling to 0°C the boiler flow will increase to 85°C. Fig.38 Sensor position N S W E X X North West 1/2 H 2.5m Min H PN-0000626 6 Installation 46
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6.4.3 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 . 6.4.4 Outdoor sensor graph Fig.39 Graph showing available curves PN-0000627 20° 30° 35° 40° 45° 50° 55° 60° 65° 70° 75° 80° 85° 90 80 70 60 50 40 30 20 10 00 15° 10° 5° 0° -5° -10° -15° -20° There are 9 available curves. It is essential that expected outdoor temper atures and the user requirements are considered before selecting the curve. Boiler flow temperature is shown on the vertical axis. The outside tempera ture is along the horizontal axis. 6.4.5 Setting outdoor sensor curve 1. Ensure that there is power to the boiler (though it is not necessary for there to be any heating demand). 2. The central heating control knob should be turned clockwise to the position which corresponds with the desired curve as shown on the graph. 3. Curve 50 is recommended as the most suitable for the normal range of conditions expected in the UK. Consider the type of dwelling and discuss with the user their requirements — one of the other curves may be more appropriate. 4. Normally the display will show the current temperature of the water in the boiler. As the knob is turned the display will show the selected curve. 5. Once the curve is set the installation and commissioning of the boil er can be completed. 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. Fig.40 Control knob and setting curve Min Max 00 10 20 30 40 50 60 70 80 90 PN-0000628 6 Installation 47
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Fig.41 Example — setting to curve 50 PN-0000629 Min Max Curve 50 6.5 Filling the installation 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 Use the Easy Fill 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. 6 Installation 48
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7 Commissioning 7.1 General Reference should be made to BS:EN 12828, 12831 & 14336 when com missioning the boiler. Ensure that the condensate drain trap has been primed. At the time of commissioning, complete all relevant sections of the Bench mark Checklist at the rear of this publication. Open the mains water supply to the boiler and all hot water taps to purge the DHW system. Ensure that the filling loop is connected and open, then open the heating flow and return valves on the boiler. Ensure that the cap on the automatic air vent on the pump body is opened. The system must be flushed in accordance with BS 7593 and the flushing agent manufacturer’s instructions. Pressurise the system to 1.5 bar then close and disconnect the temporary filling loop except where a permanent loop is fitted. Test for gas tightness, turn the gas supply on and purge according to GB BS 6891 and in IE I.S. 813 "Domestic Gas Installations" . 7.2 Checklist before commissioning 7.2.1 Preliminary electrical checks Note Consideration must be given to Health & Safety Document 635 (The Electricity at Work Regulations, 1989). Prior to commissioning the boiler preliminary electrical system checks should be carried out. These should be performed using a suitable meter, and include checks for Earth Continuity, Resistance to Earth, Short Circuit and Polarity. 7.2.2 Checks Check That the boiler has been installed in accordance with these instructions. The integrity of the flue system and the flue seals. The integrity of the boiler combustion circuit and the relevant seals. That the condensate trap has been primed. 7 Commissioning 49
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7.3 Commissioning procedure 7.3.1 De-Aeration function Before turning on the power to the boiler, rotate the CH control knob ( ) fully anticlockwise. The purpose of the function is to remove as much air as possible from the heating system. To assist this it is essential that all precautions are taken to remove air manually before enabling the function. Ensure that all radia tors are fully bled, starting on the lowest floor in properties of more than one storey. Any high points in the system should be fitted with a suitable venting device. On the boiler’s first power up de-aeration lasts approxi mately 7 minutes. The boiler will not operate during this process. 1. Turn on the power to the boiler. The display shows "000" . 2. Turn the CH control knob ( ) 1/4 turn clockwise twice in quick succes sion (within 2 seconds). 3. Display shows "312" while de-aeration is taking place (approximately 7 minutes). 4. When de-aeration has completed, the display will show the primary flow temperature and both the CH ( ) and DHW ( ) symbols. Important If during the first commissioning process the power to the boiler is interrupted the de-aeration function will re-start automatically at the point which it stopped once power is restored. Caution If the system is drained in the future (even partly, when replacing a radiator for example) the de-aeration function must be repeated. Also the inhibitor concentration must be checked and replenished if necessary. 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 52. Fig.42 Setting de-aeration Fig.43 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 7 Commissioning 50
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1. 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 ! 2. 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). 3. Measure the gas rate— With any other appliances & pilot lights turned OFF the gas rate can be measured. It should be:- Tab.22 Natural gas 25 model 2.71 m3/h 30 model 3.26 m3/h 7.4.2 Checking combustion - chimney sweep mode The case front panel must be fitted when checking combustion. Ensure the system is cold and the gas and electric supplies are turned on. Important The person carrying out a combustion measurement should have been assessed as competent in the use of a flue gas analyser and the interpretation of the results. 1 Combustion test point 2 Incoming air for combustion test point Important Allow the combustion to stabilise before inserting the Combustion Analyser Probe into the Test Point (1). This will prevent saturation of the analyser. The combustion must be measured and recorded at the Maximum and Minimum heat inputs. Fig.44 Gas inlet test point A PN-0000362 Fig.45 Flue adaptor test points PN-0000363 1 2 7 Commissioning 51 36 model 3.81 m3/h Warning Ensure that both flue test point plugs are in place after checking combustion.
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Setting maximum and minimum output 1. Turn both control knobs fully anticlockwise and leave for 10 sec onds. 2. Turn the DHW knob ( ) 1/ 4 turn twice in quick succession (within 2 seconds). 3. "304" will appear in the display. 4. Turn the CH knob ( ) fully clockwise. "100" will appear in the dis play, indicating maximum output. 5. After checking at maximum turn the CH knob ( ) fully anticlock wise. "0" will appear in the display, indicating minimum output. Measuring the combustion Turn on the domestic hot water tap. Carry out inlet working gas pressure gas rate and combustion checks. Once all relevant tests are completed, take out of chimney sweep mode by turning the DHW control knob clockwise. Boiler is now ready to use. Fig.46 Setting chimney sweep mode 7 Commissioning 52
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Fig.47 Combustion procedure Set Boiler to Maximum Rate Allow the combustion to stabilise. Do not insert probe to avoid ‘flooding’ the analyser. Perform Flue Integrity Combustion Check Insert the analyser probe into the air inlet test point, allowing the reading to stabilise. Is O2 ! 20.6% and CO2 < 0.2% ? Verify Flue Integrity Indication that products of combustion & inlet air are mixing - further investigation is required. Check all flue components are correctly assembled, fixed & supported. Check the flue & terminal are unobstructed. Is O2 ! 20.6% and CO2 < 0.2% ? TURN APPLIANCE OFF ! Call 0344 871 1545 for advice. The appliance MUST NOT be commissioned until all problems are identified and resolved. Check CO & Combustion Ratio at Maximum Rate Whilst the boiler is still operating at maximum insert the analyser probe into the flue gas test point, allowing the reading to stabilise. Is CO < 350ppm and CO/CO2 ratio < 0.004 ? Verify Integrity of Seals Check all burner seals, internal flue seals, door & case seals. Replace any seals that appear unsound. Is CO < 350ppm and CO/CO2 ratio < 0.004 ? TURN APPLIANCE OFF ! Call 0344 871 1545 for advice. The appliance MUST NOT be commissioned until all problems are identified and resolved. If commissioning cannot be fully completed the appliance must be disconnected from the gas supply in accordance with the GSIUR. Note: Check & record the CO & combustion ratio at both maximum & minimum rates before calling 0344 871 1545. Set Boiler to Minimum Rate Allow the combustion to stabilise. Do not insert probe to avoid ‘flooding’ the analyser. Yes No No Yes No Yes Check CO & Combustion Ratio at Minimum Rate Whilst the boiler is operating at minimum insert the analyser probe into the flue gas test point, allowing the reading to stabilise. Yes No Is CO < 350ppm and CO/CO2 ratio < 0.004 ? No Yes BOILER OPERATING SATISFACTORILY. NO FURTHER ACTION REQUIRED Ensure test points are capped, the boiler case front panel is correctly fitted & secured and all other commissioning procedures completed. Complete the ‘Benchmark’ Checklist, recording the CO & combustion ratio readings as required. PN-0000466 7 Commissioning 53
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7.5 Configuring the system 7.5.1 System draining If at any time after installation it is necessary to drain and refill the central heating system (e.g. when replacing a radiator) the De-Aeration function must be activated to avoid air being trapped in the system. See De-Aeration function, page 50. Once De-Aeration is complete recommission the boiler and check that the inhibitor concentration is sufficient. 7.6 Final instructions 7.6.1 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. Complete the Package Fiche in the User Guide. 4. Hand over the User Quick Start Guide and Installation and Servicing Instruc-tions, giving advice on the necessity of regular servicing. 5. 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. 6. 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. 7. Instruct the user in the operation of the boiler controls. 8. 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. 9. Show the user the location of the system control isolation switch, and demonstrate its operation. 10. 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.48 People PN-0000333 7 Commissioning 54
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8 Operation 8.1 Use of the control panel 8.1.1 Control panel The controls are operated by the control knobs and a reset button. 1 Display screen 2 Reset button 3 CH temperature control knob 4 Service diagnostic port 5 DHW temperature control knob 6 System water pressure gauge 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. 8.2 Start up If there is no power to the boiler, switch on at the fused spur unit and en sure that the time control is in the on position and any other controls (e.g. room thermostat) are calling for heat. The boiler will begin its start se quence. This procedure performs a series of tests, after which the installa tion is purged (this takes approximately five minutes). 8.3 Frost protection Where possible, draining the system should be avoided. If the system is to be unused during winter months several precautions must be taken: Any parts of the system that are in unheated areas of the dwelling should be fitted with a device such as a pipe thermostat or frost thermo stat. Power must remain supplied to the boiler and controls. Gas must remain supplied to the boiler. The boiler pump will operate if the system temperature drops below 7°C. If the temperature falls to 4°C the burner will ignite and remain lit until the temperature reaches 10°C. At this temperature the burner will extinguish but the pump will continue to operate for 15 minutes. This feature will pro tect the boiler and to some extent adjacent parts of the system but addi tional devices must be incorporated to guarantee frost protection. Fig.49 Control panel 8 Operation 55
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9 Maintenance 9.1 General 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 52 for details. 9 Maintenance 56
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Remove the plug from the combustion test point, insert the analyser probe and obtain the CO/CO2 ratio. This must be less than 0.004. If the combus tion reading (CO/CO2 ratio) is greater than this, and the integrity of the complete flue system and combustion circuit seals has been verified, and the inlet gas pressure and gas rate are satisfactory either:- Perform the "Standard Inspection and Maintenance" . Perform "Setting the Gas Valve" . Replace and set the gas valve. 1 Combustion test point 2 Incoming air for combustion test point Warning Ensure that both flue test point plugs are in place after checking combustion. 9.2 Standard inspection and maintenance operations 9.2.1 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. See Specific maintenance instructions, page 59 3. Disconnect the pipe from the top of the condensate trap and the drain pipe from the condensate drain pipe connection. Undo the screw securing the bracket and trap to the boiler lower panel. 4. Remove the trap. Take care not to spill any residual condensate on the controls and P.C.B. Thoroughly rinse the trap and examine the gasket on the trap base, replacing if necessary. 5. Remove the clip securing the gas feed pipe to the air/gas venturi on the fan. Disconnect the pipe. Do not break the joint between the pipe and gas valve unless necessary. 6. Disconnect the electrode lead and the fan electrical plug. 7. Undo the four nuts retaining the burner / door assembly to the heat exchanger. 8. Carefully draw the burner / door assembly forward and remove. See Checking the burner and cleaning the heat exchanger, page 58 9. Clean any debris from the heat exchanger and check that the gaps between the tubes are clear. 10. Inspect the burner, insulation and position and condition of the elec- trode, cleaning or replacing if necessary. Clean any dirt or dust from the airbox. Fig.50 Flue adaptor test points PN-0000363 1 2 Fig.51 Remove the condensate trap 9 Maintenance 57
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11. 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. 12. Reassemble in reverse order. 13. 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. 9.2.2 Checking the water pressure In order for the boiler to operate correctly, the pressure of the water in the heating circuit must be between 1.0 and 1.5 bar. Restore the water pres sure if necessary. 9.2.3 Checking the expansion vessel Check the expansion vessel and recharge or replace it if necessary. Check its pre-charge every year and restore the pressure to 1 bar if nec essary. 9.2.4 Checking the automatic air vent Check that the boiler pump venting valve is working. In the event of a leak, replace the valve. 9.2.5 Checking the burner and cleaning the heat exchanger 1. Isolate the boiler from the gas & electrical supplies. 2. Remove the front panel. 3. Remove the silencer. 4. Disconnect the spark electrode lead and earth wire from the detec tion / spark electrode. 5. Remove the clip securing the gas feed pipe to the fan. Disconnect the pipe. 6. Completely remove the combustion chamber / burner door assembly by unscrewing the four M6 nuts and drawing it forwards to disen gage it from the heat exchanger.. 7. Check that the detection/spark electrode is not worn. Replace the electrode if necessary. 8. Check the condition of the burner, the gasket and the insulation board. 9. Any loose deposits in the heat exchanger should be removed using a vacuum cleaner. 10. A brush with plastic bristles can be used to dislodge any stubborn deposits, which should then also be removed by vacuum. 11. Do not use any chemicals to clean the heat exchanger. 12. The burner does not require any maintenance as it is self-cleaning. Check that there are no cracks and/or other damage on the surface of the burner. If the burner is damaged, replace it. 13. Reassemble in reverse order. Fig.52 Restore water pressure PN-0000382 Fig.53 Remove burner / door assembly PN-0000394 9 Maintenance 58
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9.3 Specific maintenance instructions 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 font panel MUST seal effectively against the boiler side panels. To remove the case front panel proceed as follows: Unscrew the two screws located on the bottom of the front panel. Slide the bottom of the front panel forward and lift upwards to disengage the panel. Hinge down the control panel. 9.3.1 Detection/spark ignition electrode 1. Disconnect the electrode lead and earthing cable. 2. Using a T15 Torx key, remove the retaining screws securing the electrode to the combustion chamber door and remove the elec trode, noting its orientation. 3. Fit the new electrode with the sealing gasket. 4. Reassemble in reverse order. 9.3.2 NTC flue sensor 1. Turn the sensor 90° anticlockwise to remove — it is a bayonet con nection. 2. Ease the retaining tab on the sensor away and disconnect the elec trical plug. 3. Fit new sensor and reassemble in reverse order. Fig.54 Panel removal Fig.55 Remove detection/spark ignition electrode PN-0000331 Fig.56 Remove NTC flue sensor PN-0000332 9 Maintenance 59 %RWKIOXHWHVWSRLQWSOXJVDUHLQSODFH 7KHIURQWFRYHULVFRUUHFWO\ILWWHG WKHVHFXULQJVFUHZVDUH IXOO\WLJKWHQHG Warning After servicing or performing any maintenance on the boiler ensure that
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9.3.3 Flow and return sensors There is one sensor on the flow (red wires) and one sensor on the return (blue wires). 1. After noting the position of each sensors, prise the sensor clip off the pipe and disconnect the plug. 2. Connect the plug to the new sensor and ease the clip onto the pipe in its original position. 9.3.4 Safety overheat thermostat 9.3.5 DHW temperature sensor (NTC) 1. Turn off the mains cold water supply tap and draw off the residual domestic hot water. 2. Ease the retaining tab on the sensor away and disconnect the elec trical plug. 3. Unscrew the sensor from the plate heat exchanger manifold. Exam ine the sealing washer, replacing if necessary. 4. Reassemble in reverse order with the new sensor. The plug will only fit one way. 9.3.6 Pressure Gauge 1. Drain the primary circuit and undo the nut on the pressure gauge ca pillary. 2. Ease the two retaining tabs holding the pressure gauge bracket away and remove the bracket. 3. Remove the gauge assembly. 4. Examine the sealing washer on the pressure gauge capillary, re place if necessary. 5. Reassemble in reverse order with the new pressure gauge. Fig.57 Remove flow and return sensors Fig.58 Removing safety overheat thermo stat Fig.59 Remove DHW temperature sensor 9 Maintenance 60 1. Pull the two spade connections off the safety overheat thermostat. 2. Prise the clip off the pipe and remove the thermostat. 3. Fit the new thermostat in the new position. 4. Connect the two spade connections to the new thermostat ensuring that they are pushed fully on.
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9.3.7 Hall effect sensor 1. Ease the sensor upwards off the hydraulic inlet manifold assembly. 2. Disconnect the electrical plug from the sensor. 3. Connect the plug to the new sensor. Carefully fit the new sensor to the hydraulic assembly, ensuring it is fully down. 9.3.8 DHW flow regulator and filter 1. Close the cold mains inlet and draw off any residual DHW. 2. Pull off the hall effect sensor. 3. Unscrew the filter assembly from the inlet / return manifold. 9.3.9 Safety pressure relief valve 1 Safety pressure relief valve 2 "O" ring seal 3 Sealing grommet 4 Discharge pipe 5 Grub screw 1. Drain the primary circuit. 2. Disconnect the discharge pipe from the valve and remove the seal ing grommet. 3. Using a suitable hexagon key undo the grub screw sufficiently to re lease the valve. 4. Note the orientation of the valve, rotate it and withdraw it from the manifold. 5. Fit the new valve and ‘O’ ring seal and set to the previously noted orientation. Tighten the grub screw. 6. Reconnect the discharge pipe ensuring the sealing grommet is in place to maintain the integrity of the case seal. Fig.60 Remove hall effect sensor Fig.61 Remove flow regulator and filter Fig.62 Remove safety pressure relief valve 9 Maintenance 61
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9.3.10 Diverter valve motor 1. Disconnect the multi-pin plug from the diverter valve motor. 2. Hold the motor in place against the spring pressure of the valve as sembly, remove the securing clip. 3. Remove the motor. 4. When fitting the new motor it will be necessary to hold the unit firmly while depressing the valve assembly spring to refit the securing clip. 5. Reconnect the multi-pin plug. 9.3.11 Expansion vessel Warning Take precautions to protect other components from water damage when removing the expansion vessel. 1. Close the flow and return isolation taps and drain the boiler primary circuit. 2. Relieve the pressure from the expansion vessel. 3. Remove the silencer. 4. Prise off the securing clips and disconnect the braided hose from the vessel and hydraulic inlet assembly, taking care as water may still be in the vessel. 5. Ensure that the braided hose is free of restriction, as a boiler with a blocked hose will exhibit symptoms similar to one with a failed ves sel. Important Where the hose is found to be blocked, it must be cleared or re placed and the vessel recharged to 1 bar. 6. If the hose is clear support the vessel, undo the locknut and ma noeuvre the vessel out of the boiler. 7. Replace the expansion vessel with the new one and reassemble in reverse order and recharge to 1 bar. 9.3.12 Gas valve Tab.23 Characteristics of combustion CO2 % (maximum) 9.0 + 0.3 – 0.2 9.0 + 0.3 – 0.2 % (minimum) 8.5 + 0.1 – 0.4 8.5 + 0.1 – 0.4 Diameter of coaxial discharge pipes mm 60/100 & 80/125 60/100 & 80/125 Fig.63 Remove diverter valve Fig.64 Remove expansion vessel PN-0000378 9 Maintenance 62 9.0 + 0.3 – 0.2 8.5 + 0.1 – 0.4 60/100 & 80/125 Baxi Platinum Compact Combi 25 30 36
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Important After replacing the gas valve the CO2 must be checked and adjus ted. Only change the valve if a suitable calibrated combustion an alyer is available, operated by a competent person. 1. Undo the screw and disconnect the electrical plug. 2. Turn the gas cock off and undo the nut on the gas valve inlet under neath the boiler. 3. Undo the nut on the gas valve outlet. Ease the pipe aside. Important The gas nozzle injector is inserted in the gas valve outlet. 4. Remove the screws securing the gas valve to the boiler bottom pan el. Remove the valve. 5. Transfer the gas nozzle injector to the new valve, ensuring it sits in the valve outlet. Examine the sealing washers, replacing if necessa ry. 6. Reassemble in reverse order. Important Check gas tightness and combustion. Fig.65 Removing the gas valve PN-0000308 9 Maintenance 63
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Setting the gas valve (CO2) Important The CO2 must be only checked and adjusted to set the valve if a suitable calibrated combustion analyser is available, operated by a competent person. See Annual Servicing, page 57 1. The combustion (CO2) may be checked after running the boiler for several minutes. To do this it is necessary to set the boiler to "Calibra tion Mode" . 2. Ensure that all external controls are calling for heat. The actual current boiler temperature is shown on the display. 3. Turn both control knobs fully anticlockwise, then quickly turn the right hand knob 1/4 clockwise twice and back in quick succession (within 2 seconds). "304" will appear in the display screen. 4. Turn the left hand knob fully clockwise. "100" will appear in the display screen, indicating maximum output. 1 Combustion test point 2 Incoming air for combustion test point A Throttle Adjustment Screw B Offset Adjustment Screw 5. Remove the plug from the flue sampling test point. Insert the analyser probe and allow sufficient time for the reading to settle. CO2 % (maximum) 9.0 + 0.3 – 0.2 6. It is possible to alter the CO2 by adjustment of the gas valve. Remove the plastic cover from the Throttle Adjustment Screw. At maximum rate the throttle adjustment screw should be turned, using a suitable hexagon key, until the correct reading is obtained. Turning clockwise will reduce the CO2. Turning anticlockwise will increase the CO2. 7. The CO2 must then be checked at minimum rate. Turn the left hand knob fully anticlockwise. As the knob is turned the display will change, indicating the fan speed. When the display reads "0" the boiler runs at minimum rate. CO2 % (minimum) 8.5 + 0.1 — 0.4 8. With the boiler on minimum, the Offset Adjustment Screw must be al tered, using a suitable hexagon key, after removing the cap. Turning clockwise will increase the CO2. Turning anticlockwise will reduce the CO2. 9. The calibration function is maintained for 20 minutes unless the maxi mum central heating temperature is exceeded. The function can be disabled at any time by turning the right hand knob. 10. Check the combustion performance (CO/CO2 ratio). This must be less than 0.004. Fig.66 Setting the gas valve 9 Maintenance 64 Baxi Platinum Compact Combi 25-30-36 25-30-36 Baxi Platinum Compact Combi Warning Ensure that both flue test point plugs are in place after checking combustion.
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9.3.13 Pump 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. 3. Disconnect the electrical plugs from the pump motor. 4. Prise off the securing clip that is holding the pump return pipe in po sition. Pull away the pipe. 5. Pull out the securing clip that is holding the pump body to the hy draulic inlet assembly. 6. Prise off the securing clip and disconnect the braided hose from the pump body, taking care as water may still be in the hose. 7. Remove the screws securing the pump to the boiler bottom panel. 8. The pump should now be able to be remove. 9. Pull out the securing clip and remove the automatic air vent, trans fering it to the new pump body. 10. Examine all ‘O’ ring seals, replace if necessary and reassemble in reverse order. 9 Maintenance 65
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10 Troubleshooting 10.1 Error codes 10.1.1 Initial error fault finding checks Check that gas, water and electrical supplies are available at the boiler. Electrical supply = 230V ~ 50 Hz. The minimum gas pressure at the meter is 19mb. Carry out electrical system checks, i.e. Earth Continuity, Resistance to Earth, Short Circuit and Polarity with a suitable meter. Ensure all external controls are calling for heat and check all external and internal fuses. Important These checks must be repeated after any servicing or fault find ing. 10.1.2 Display of error codes If a fault occurs on the boiler an error code may be shown by the display screen. The codes are a flashing number, either two or three digit, preceded by the symbol :- followed by 20, 28, 40, 160 or 321 indicates possible faulty compo nents. 110 indicates overheat of the primary system water. 118 is displayed when the primary water pressure is less than 0.5 bar. 133, 134 and 135 indicates that the gas supply has been interrup ted, ignition has failed or the flame has not been detected. 128 is displayed if there has been a flame failure during normal op eration. 125 is displayed in either of two situations:- If between 15 and 30 seconds of the burner lighting, the primary water temperature has not changed by 1° C. If within 10 minutes of the burner lighting, the primary water tem perature actual temperature twice exceeds the selected temper ature by 30°. In these instances poor primary circulation is indi cated. By pressing the Reset button for 1 to 3 seconds when 09, 15, 110, 125, 128, 133, 134, 135, 384 are displayed it is possible to relight the boiler. If this does not have any effect, or the codes are displayed regularly fur ther investigation is required. Fig.69 Display of error codes (UURUFRGH 'HVFULSWLRQRIIDXOW *DVYDOYHFRQQHFWLRQFDEOH *DVYDOYHIDXOW &HQWUDOKHDWLQJ17&IDXOW )OXH17&IDXOW &HQWUDOKHDWLQJUHWXUQ17&IDXOW &RPPXQLFDWLRQHUURU 3UHFLUFXODWLRQIDXOW 6DIHW\WKHUPRVWDWRSHUDWHG 3ULPDU\V\VWHPZDWHUSUHVVXUHWRRORZ &LUFXODWLRQIDXOW SULPDU\ )ODPHIDLOXUH )OXH17&RSHUDWHG ,QWHUUXSWLRQRIJDVVXSSO\RUIODPHIDLOXUH ,QWHUUXSWLRQRIJDVVXSSO\ LQWHUQDOHUURU )ORZUHWXUQVHQVRUWHPSHUDWXUHWHVW )DQRUIDQZLULQJIDXOW &LUFXODWLRQIDXOW 'U\ILUH +RWZDWHU17&IDXOW )DOVHIODPH PN-0000377 10 Troubleshooting 66
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10.2 Fault finding 10.2.1 Central heating Fig.70 Central heating — Follow operational sequence Turn on mains power The display illuminates 20, 28, 40 or 321 flashing 118 flashing 09, 15, 110, 125, 133, 134, 135 or 384 flashing Set Central Heating temperature to Maximum. symbol flashing, pump runs Go to section ‘A’ Go to section ‘D’ Ensure all controls and programmers are calling for heat Go to section ‘B’ If 110 is still flashing go to section ‘H’ YES NO NO NO NO NO NO NO Go to section ‘I’ Ensure controls are set to demand and verify the contacts are closed NO Press the reset button for 1 to 3 seconds YES Fan runs after up to 3 minutes 160 flashing Go to section ‘C’ NO If 09, 15, 110 or 384 is flashing or re-occurs regularly, check all PCB connections. If this has no effect replace the PCB. Fan runs at correct speed 160 flashing Go to section ‘C’ Spark at ignition electrodes up to 5 seconds & for 3 attempts Go to section ‘F’. Press the reset button for 1 to 3 seconds Burner lights Go to section ‘E’ Burner goes out after 5 seconds 128 flashing Go to section ‘G’ NO 109 flashing 125 flashing after 1 min Go to section ‘J’ 110 flashing NO Go to section ‘H’ NO Diverter valve open to Central Heating circuit NO Go to section ‘K’ Burner modulates to maintain set temperature Check Heating flow sensor. Go to section ‘D’ NO 130 flashing NO Go to section ‘M’ Burner goes out NO Fan stops after 10 seconds Boiler operation correct 133 flashing YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES PN-0000315 See Electrical diagram, page 18 for position of terminals and compo nents. 10 Troubleshooting 67
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10.2.2 Domestic hot water Fig.71 Domestic hot water — Follow operational sequence Turn on mains power The display illuminates 20, 28, 40 or 321 flashing 118 flashing 09, 15, 110, 125, 133, 134, 135 or 384 flashing Set Hot Water temperature to Maximum & fully open hot tap symbol flashing, pump runs. Go to section ‘A’ Go to section ‘D’ DHW flow rate greater than 2litres/min Burner lights 133 flashing If 110 is still flashing go to section ‘H’ YES YES NO NO NO YES YES YES NO YES YES YES NO NO NO Go to section ‘I’ NO Press the reset button for 1 to 3 seconds YES Fan runs after up to 3 minutes 160 flashing Go to section ‘C’ NO Fan runs at correct speed 160 flashing Go to section ‘C’ Spark at ignition electrodes up to 5 seconds & for 3 attempts Go to section ‘F’. Press the reset button for 1 to 3 seconds YES Burner lights Go to section ‘E ’ Burner goes out after 5 seconds 128 flashing Go to section ‘G’ YES YES NO 109 flashing 125 flashing after 1 min Go to section ‘J’ YES YES 110 flashing NO Go to section ‘H’ YES NO Diverter Valve open to Domestic Hot Water circuit NO Go to section ‘K’ YES Burner modulates to maintain set temperature Check CH NTC sensor. Go to section ‘D’ NO 130 flashing NO Go to section ‘M’ YES Burner goes out NO Fan stops after 10 seconds YES Boiler operation correct YES Go to section ‘L’ NO Go to section ‘L’ Go to section ‘B’ YES If 09, 15, 110 or 384 is flashing or re-occurs regularly, check all PCB connections. If this has no effect replace the PCB. PN-0000316 10 Troubleshooting 68
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10.2.3 Fault finding solutions sections A to E Fig.72 Solutions sections A to E Is there 230V at: Main terminals L and N Check electrical supply 1. NO Main terminal fuse Replace fuse Display illuminated 2. NO PCB - X10 connector Main terminals L and N Check wiring 3. NO NO A B C NO Fan connections correct at fan & PCB X11 and X23 connectors - see Wiring Diagram Make connections Fan jammed or faulty wiring Connection OK at X41 Display or Main PCB fault Switch to DHW mode maximum flow and press reset. During next 3 minutes check:- 230V at PCB - X13 connector (between black & white - see Wiring Diagram) NO Replace PCB YES 230V between PCB - X13 connector and PCB - X11 connector - see Wiring Diagram NO Replace PCB YES 230V at pump YES Replace pump NO Check wiring YES NO Replace PCB Replace fan or wire YES YES Temperature sensor faulty. Check correct location and wiring. NO D Replace sensor Cold resistance approximately 10kΩ @ 25° C (DHW and CH sensors) (resistance reduces with increase in temp.) YES Gas at burner Ensure gas is on and purged Replace PCB Replace gas valve Check wiring and PCB - X36 connector see Wiring Diagram YES NO NO E 230V at PCB - X11 connector (between blue & brown - see Wiring Diagram) PN-0000317 10 Troubleshooting 69
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10.2.4 Fault finding solutions sections F to H Fig.73 Solutions sections F to H Replace PCB Check and correct if necessary 1. Ignition electrode and lead 2. Electrode connection 3. Spark gap and position Check wiring - see Electrical Wiring Diagram page 18 YES NO F 4 ±0.5 10±1 Check and correct if necessary 1. The set of the gas valve (CO2 values - see instruction) 2. Flame sensing electrode and lead connections 3. Flame sensing electrode position 1. 2. G Replace flame sensing electrode or PCB Replace PCB YES Replace safety thermostat YES YES Safety thermostat operated or faulty Check for and correct any system faults H Allow to cool. Continuity across thermostat terminals more than 1.5 ohm NO Check Flow & Return Sensors - see section ‘D’ NO Is 110 still flashing ? YES Check supply pressure at the gas valve:- Natural Gas - Minimum 17 mbar PN-0000318 10 Troubleshooting 70
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10.2.5 Fault finding solutions sections I to M Fig.74 Solutions sections I to M I M Temperature sensors faulty. Cold resistance approximately 10k Ω @ 25° C (CH sensor) 20k Ω @ 25° C (Flue sensor) (resistance reduces with increase in temp.) NO Replace sensor YES If pump is running the heat exchanger could be obstructed Replace heat exchanger 1. 2. Replace hydraulic pressure switch YES Restore system pressure YES NO CH system pressure less than 0.5 bar Check wiring and PCB - X22 connector for approx. 5V DC between green wires from pressure switch - see Wiring Diagram Replace PCB NO J Replace sensor NO System fault - correct NO YES Ensure that the boiler and system are fully vented Check flow temperature sensor connections and position. Cold resistance approximately 10k Ω @ 25° C (CH sensors) (resistance reduces with increase in temp.) YES Go to section ‘B’ K Is there 230V at: Diverter valve motor Replace motor 1. YES PCB - X13 connector terminals between:- Black & Red (central heating mode) Black & White (domestic hot water mode) see Wiring Diagram Replace PCB 2. NO Check diverter valve cable YES L YES NO Replace PCB Replace Hall Effect Sensor Is mains water filter & assembly clean, and rotor moving freely ? Clean or replace NO Check wiring and PCB - X22 connector for approx. 5V DC between red & blue from Hall Effect sensor - see Wiring Diagram YES PN-0000319 10 Troubleshooting 71
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11 Decommissioning 11.1 Decommissioning procedure Disconnect the gas & electric supplies and isolate them. Drain the primary circuit and disconnect the filling device. Dismantle the chimney system and remove the boiler from the wall mount ing frame. 11 Decommissioning 72 12 Disposal 12.1 Disposal and recycling Caution Removal and disposal of the boiler must be carried out by a quali fied person in accordance with local and national regulations. 12 Disposal
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73 13 Spare parts 13 Spare parts 13.1 Short parts list The following spares are available: Tab.24 Part number and description of spare parts Key No. Description Manufacturer’s Spare Part No. A Safety thermostat 7778624 B Detection / spark ignition electrode 7686344 C Flow sensor and return sensor 720747101 D NTC flue sensor 7207892 E Diverter valve motor 7216534 G Burner / door assembly 7686323 H Insulation rear 7661741 J Insulation front 7661745 K Pump assembly 7842891 L Expansion vessel 7683801 M Plate heat exchanger (25 & 30) 7683965 N Hall effect sensor 720788001 O Hydraulic pressure switch 5114748 P Gas valve 7683968 Q Fan (25 & 30) 7683926 Fig.75 Spare parts D A K H J E M C B G N O L P Q M Plate heat exchanger (36) Q Fan (36) 7715760 7715779 Please visit the Baxi Parts Arena website for the complete current parts list.
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74 $SSHQGL[ %HQFKPDUNFRPPLVVLRQLQJFKHFNOLVW Warning After servicing or performing any maintenance on the boiler ensure that %RWKIOXHWHVWSRLQWSOXJVDUHLQSODFH 7KHIURQWFRYHULVFRUUHFWO\ILWWHG WKHVHFXULQJVFUHZVDUHIXOO\WLJKWHQHG $SSHQGL[ Use this code to download the Benchmark app
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78 14.2 Product fiche - Combination boilers
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79 14.3 Package fiche - boilers
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81 14.4 Package fiche - Combination heaters (boilers or heat pumps)
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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. 7846425-01
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