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Инструкция Baxi Instruction Baxi MainEco Combi and System Installation and Service Manual
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These instructions include the Benchmark Commissioning Checklist and should be left with the user for safe keeping. They must be read in conjunction with the Flue Installation Guide. United Kingdom en 24-28-35 / 18-24 Installation and Service Manual Wall Mounted Gas Condensing Boiler Baxi MainEco Combi and System
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Dear customer, Thank you for purchasing this appliance. Please read this manual carefully before using the product and keep it in a safe place for future reference. In order to ensure continued safe and efficient operation we recommend that the product is regularly maintained. Our Service and After Sales organization can assist with this. We hope you will receive many years of satisfactory service.
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Contents 1.1 Building Regulations and the Benchmark Commissioning Checklist ....................................6 1.2 The Benchmark Scheme ......................................6 1.3 Installer Notification Guidelines ..........................7 2 Introduction ................................................................................................8 2.1 Symbols used .......................................................8 2.2 Abbreviations ........................................................8 2.3 General ..................................................................8 2.3.1 Manufacturer’s liability .............................................8 2.3.2 Installer’s liability .....................................................9 2.3.3 User’s liability ..........................................................9 2.4 Homologations ....................................................10 2.4.1 Certifications .........................................................10 2.4.2 Additional Directives ..............................................10 3 Safety instructions and recommendations ............................................11 3.1 Safety instructions .............................................11 3.2 Recommendations ..............................................11 4 Technical description ..............................................................................13 4.1 General description ............................................13 4.2 Main parts ............................................................13 4.3 Skeleton Diagrams .............................................14 4.4 Operating principle .............................................14 4.4.1 Gas/air setting .......................................................14 4.4.2 Combustion ...........................................................15 4.4.3 Heating and domestic hot water production ..........15 4.4.4 Control system ......................................................15 4.4.5 Adjustment ............................................................15 4.4.6 Regulation of the water temperature .....................16 4.4.7 Protection against low water or no circulation ..............................................................16 4.4.8 Overheat temperature protection ..........................16 02092014 - 7619497-02 1
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4.5 Circulating pump (Available pump head) .........16 4.6 Technical specifications ....................................17 5 Installation ................................................................................................19 5.1 Regulations governing installation ...................19 5.2 Choice of the location ........................................20 5.2.1 Type plate .............................................................20 5.2.2 Location of the boiler .............................................20 5.3 Main dimensions .................................................22 5.4 Positioning the boiler .........................................23 5.5 Hydraulic connections .......................................23 5.5.1 Flushing the system ..............................................24 5.5.2 Water flow rate ......................................................24 5.5.3 Connection of the heating circuit ...........................24 5.5.4 Connection of the water circuit for domestic use ........................................................................25 5.5.5 Connecting the expansion vessel .........................25 5.5.6 Connecting the safety valve discharge pipe ..........26 5.5.7 Connecting the condensate discharge pipe ..........26 5.5.8 Automatic air bleed ...............................................28 5.6 Gas connection ...................................................29 5.7 Connections for the air and exhaust pipes ....................................................................29 5.7.1 Classification .........................................................29 5.7.2 Outlets ...................................................................30 5.7.3 Lengths of the air/flue gas pipes ...........................31 5.7.4 Additional Directives ..............................................32 5.7.5 Connection of the combustion gas exhaust pipe .......................................................................32 5.8 Electrical connections ........................................32 5.8.1 Control unit ............................................................32 5.8.2 Recommendations ................................................33 5.8.3 Access to the connector block / Boiler HMI ...........34 5.8.4 Connection options ...............................................34 5.9 Electrical diagram ...............................................38 5.10 Filling the system ...............................................38 5.10.1 Water treatment ....................................................38 5.10.2 Filling the condensate trap ....................................39 5.10.3 Filling the system ..................................................40 5.10.4 Venting the system ................................................41 Contents 02092014 - 7619497-02 2
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6 Commissioning ........................................................................................42 6.1 Control panel .......................................................42 6.2 Check points before commissioning ................43 6.2.1 Preparing the boiler for commissioning .................43 6.2.2 Hydraulic circuit .....................................................43 6.2.3 Electrical connections ...........................................43 6.3 Commissioning the boiler ..................................43 6.4 Gas settings ........................................................45 6.4.1 Gas circuit .............................................................45 6.4.2 Checking combustion ............................................45 6.4.3 Setting the air/gas ratio .........................................48 6.5 Finalizing work ....................................................49 6.6 Parameter descriptions ......................................50 7 Switching off the boiler ............................................................................52 7.1 Installation shutdown .........................................52 7.2 Antifreeze protection ..........................................52 8 Checking and maintenance .....................................................................53 8.1 General instructions ...........................................53 8.2 Standard inspection and maintenance operations ...........................................................53 8.2.1 Open the boiler ......................................................53 8.2.2 Checking the hydraulic pressure ...........................54 8.2.3 Checking the expansion vessel .............................54 8.2.4 Checking the ionization current .............................54 8.2.5 Checking the DHW transfer capacity ....................55 8.2.6 Checking the flue gas discharge and the air supply ....................................................................55 8.2.7 Checking combustion ............................................55 8.2.8 Checking the automatic air vent ............................55 8.2.9 Checking the condensate trap ..............................56 8.2.10 Checking the burner and cleaning the heat exchanger .............................................................57 8.3 Specific maintenance operations ......................58 8.3.1 Replacing the ionization/ignition electrode ............58 8.3.2 Replacing the 3-way valve ....................................59 8.3.3 Cleaning the plate heat exchanger .......................59 8.3.4 Cleaning the domestic water cartridge ..................60 8.3.5 Replacement of the expansion vessel ..................60 8.3.6 Re-assembling the boiler ......................................61 02092014 - 7619497-02 3
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9 Troubleshooting .......................................................................................63 9.1 Error codes ..........................................................63 9.2 Shutdowns and lock-outs ..................................63 9.2.1 Blocking .................................................................63 9.2.2 Lock out .................................................................65 10 Spare parts ................................................................................................70 10.1 General ................................................................70 10.2 Spare parts ..........................................................70 11 Appendix ...................................................................................................71 11.1 User instruction card ..........................................71 11.2 Gas boiler system commissioning checklist ..............................................................72 11.3 Service record .....................................................73 Contents 02092014 - 7619497-02 4
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02092014 - 7619497-02 5 EC declaration of conformity The device complies with the standard type described in the EG declaration of conformity. It was manufactured and commissioned in accordance with European directives. The original declaration of conformity is available from the manufacturer.
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1.1 Building Regulations and the Benchmark Commissioning Checklist Building Regulations (England & Wales) require notification of the installation of a heating appliance to the relevant Local Authority Building Control Department. This can be achieved via a Competent Persons Self Certification Scheme as an option to notifying the Local Authority directly. The Health & Safety Executive operates the ’Gas Safe Register’, a selfcertification 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 installation and commissioning of central heating systems in the UK and to encourage the regular servicing of all central heating systems to ensure safety and efficiency. Building Regulations require that installations should comply with manufacturer’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 necessary to ensure compliance with Building Regulations. 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 reference. Installers are required to carry out installation, commissioning and servicing 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 information. R000725-A Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 6 02092014 - 7619497-02
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1.3 Installer Notification Guidelines R000696-01 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 Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 02092014 - 7619497-02 7
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2 Introduction 2.1 Symbols used In these instructions, various danger levels are employed to draw the user’s attention to particular information. In so doing, we wish to safeguard the user’s safety, highlight hazards and guarantee correct operation of the appliance. DANGER Risk of a dangerous situation causing serious physical injury. WARNING Risk of a dangerous situation causing slight physical injury. CAUTION Risk of material damage. Signals important information. ¼Signals a referral to other instructions or other pages in the instructions. 2.2 Abbreviations 4 LTH: Low temperature heating 4 DHW: Domestic hot water 4 HRU: Heat Recovery Unit 4 PCU: Primary Control Unit - Electronic system to control burner function 4 SCU: Secondary Control Unit - Additional electronic system 2.3 General 2.3.1. Manufacturer’s liability Our products are manufactured in compliance with the requirements of the various applicable European Directives. They are therefore delivered with [ marking and all relevant documentation. 2. Introduction Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 8 02092014 - 7619497-02
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In the interest of customers, we are continuously endeavouring to make improvements in product quality. All the specifications stated in this document are therefore subject to change without notice. Our liability as the manufacturer may not be invoked in the following cases: 4 Failure to abide by the instructions on using the appliance. 4 Faulty or insufficient maintenance of the appliance. 4 Failure to abide by the instructions on installing the appliance. 2.3.2. Installer’s liability The installer is responsible for the installation and commissioning of the appliance. The installer must respect the following instructions: 4 Read and follow the instructions given in the manuals provided with the appliance. 4 Carry out installation in compliance with the prevailing legislation and standards. 4 Perform the initial start up and carry out any checks necessary. 4 Explain the installation to the user. 4 If a maintenance is necessary, warn the user of the obligation to check the appliance and maintain it in good working order. 4 Give all the instruction manuals to the user. 2.3.3. User’s liability To guarantee optimum operation of the appliance, the user must respect the following instructions: 4 Read and follow the instructions given in the manuals provided with the appliance. 4 Call on qualified professionals to carry out installation and initial start up. 4 Get your installer to explain your installation to you. 4 Ensure the Appliance is serviced in accordance with the manufacturer’s instructions by a suitable qualified person. 4 Keep the instruction manuals in good condition close to the appliance. This appliance is not intended to be used by persons (including children) whose physcial, sensory or mental capacity is impaired or persons with no experience or knowledge, unless they have the benefit, through the intermediary of a person responsible for their safety, of supervision or prior instructions regarding use of the appliance. Care should be taken to ensure that children do not play with the appliance. If the mains power lead is damaged it must be replaced by the original manufacturer, the manufacturer’s dealer or another competent person to prevent hazardous situations. Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 2. Introduction 02092014 - 7619497-02 9
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2.4 Homologations 2.4.1. Certifications CE identification no PIN 0063CM3019 NOx classification 5 (Standards EN) Type of connection (Flue gas outlet) C13, C33, C53 Gas Council number MainEco Combi 24: 47–075–93 MainEco Combi 28: 47–075–94 MainEco Combi 35: 47–075–95 MainEco System 18: 41–470–13 MainEco System 24: 41–470–14 2.4.2. Additional Directives Apart from the legal provisions and Directives, the additional Directives described in these instructions must also be observed. For all provisions and Directives referred to in these instructions, it is agreed that all addenda or subsequent provisions will apply at the time of installation. 2. Introduction Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 10 02092014 - 7619497-02
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3 Safety instructions and recommendations 3.1 Safety instructions DANGER If you smell gas: 1. Do not use a naked flame, do not smoke, do not operate electrical contacts or switches ( doorbell, light, motor, lift, etc..). 2. Shut off the gas supply. 3. Open the windows. 4. Report any leaks immediately. 5. Trace possible leaks and seal them immediately. 6. If the gas leak is before the gas meter, contact the gas supplier. DANGER If you smell flue gases: 1. Switch the appliance off. 2. Open the windows. 3. Report any leaks immediately. 4. Trace possible leaks and seal them immediately. 3.2 Recommendations WARNING 4 Installation and maintenance of the boiler must be carried out by a qualified professional in compliance with prevailing local and national regulations. 4 When working on the boiler, always disconnect the boiler from the mains and close the main gas inlet valve. 4 After maintenance or repair work, check all installations to ensure that there are no leaks. CAUTION The boiler must be installed in a frost-free environment. Keep this document close to the place where the boiler is installed. Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 3. Safety instructions and recommendations 02092014 - 7619497-02 11
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Casing components Only remove the casing for maintenance and repair operations. Put the casing back in place after maintenance and repair operations. Instructions stickers The instructions and warnings affixed to the appliance must never be removed or covered and must remain legible during the entire lifespan of the appliance. Immediately replace damaged or illegible instructions and warning stickers. Modifications Modifications may only be made to the boiler after the written permission of BAXI to do so. 3. Safety instructions and recommendations Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 12 02092014 - 7619497-02
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4 Technical description 4.1 General description Wall-hung gas condensing boilers 4 High efficiency heating. 4 Low pollutant emissions. 4 Installation and connection facilitated by the mounting frame delivered with the appliance. 4 Flue gas discharge via a forced flue or chimney type connection. 4 Baxi MainEco Combi 24 - 28 - 35: Heating and domestic hot water production. 4 Baxi MainEco System 18 - 24: Heating only. 4.2 Main parts 1 Flue gas outlet/Air intake (Combustion air/flue gas adapter 60/100) 2 Casing/air box 3 Outlet for measuring combustion gases 4 Ignition/ionization electrode 5 Flue gas discharge pipe 6 Gas/air system with a fan, gas block and automatic burner unit 7 Air intake silencer 8 Plate heat exchanger (DHW) (Only for Combi models) 9 Connection box 10 Condensate trap 11 Circulation pump 12 3-way valve 13 Primary heat exchanger 14 Expansion vessel 15 Automatic air vent T004783-A 3 5 6 7 9 8 13 12 14 15 11 10 1 2 4 Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 4. Technical description 02092014 - 7619497-02 13
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4.3 Skeleton Diagrams Combi 24 - 28 - 35 1 Primary heat exchanger 2 Hydroblock 3 Plate heat exchanger (DHW) 4 Safety valve 5 Heating flow 6 Domestic hot water outlet (DHW) 7 Domestic cold water inlet 8 Heating return 9 Circulation pump (Central heating) 10 3-way valve System 18 - 24 1 Primary heat exchanger 2 Safety valve 3 Heating flow 4 Heating return 5 Circulation pump (Central heating) 4.4 Operating principle 4.4.1. Gas/air setting The casing fitted to the boiler is also used as an air box. Air is sucked in by the fan and gas injected into the venturi by the fan intake. The fan rotation speed is set according to the settings parameters, the thermal energy requirement and the temperatures measured by the temperature sensors. The gas and air are mixed in the venturi. The gas/air ratio ensures that the quantities of gas and air are adjusted to each other. This provides optimum combustion on the entire output range. The gas/air mixture is fed into the burner on top of the exchanger. T003393-D 5 6 7 8 1 2 3 4 10 9 T003807-A 3 4 1 2 5 4. Technical description Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 14 02092014 - 7619497-02
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4.4.2. Combustion The burner heats the heating water circulating in the heat exchanger. At a return temperature lower than around 55°C, the flue gases cool down to a temperature lower than the dew point, thus causing the condensation of the water vapour contained in the flue gases in the lower section of the heat exchanger. The heat released during this condensation process (the latent heat or condensing heat) is also transferred to the heating water. The cooled combustion gases are evacuated via the combustion gas outlet flue. The condensation water is evacuated via a condensate trap. 4.4.3. Heating and domestic hot water production On combi boilers, an integrated plate exchanger heats the domestic water. A 3-way valve determines whether the heated water is fed into the heating system or the plate exchanger. A pick-up sensor signals that a hot water tap is being opened. This signal is transmitted to the control panel, which then switches the 3-way valve to the hot water position and trips the heating pump. The 3-way valve is spring-loaded but only consumes electricity when it switches to another position. The heating water reheats the domestic water in the plate exchanger. In comfort mode, if there is no hot water draw-off, the boiler handles the periodic reheating of the plate exchanger. Any limescale particles are kept out of the plate exchanger by a self- cleaning water filter (self-cleans once every 76 hours). 4.4.4. Control system Control of the boiler ensures reliable delivery of heat. This means that the boiler treats external negative influences in a practical manner (notably when the water-flow is insufficient or there are problems with air supply). In the presence of such influences, the boiler doesn’t switch into locking mode, but first reduces his power and, depending on the nature of the circumstances, will be temporarily out of service (blocking or stop). The boiler will continue to supply heat as long as the situation does not become dangerous. 4.4.5. Adjustment The power of the boiler can be adjusted in the following ways: 4 On/Off setting The output between the minimum and maximum values varies based on the heating flow set point temperature. 4 Adjustable control The output between the minimum and maximum values varies based on the heating flow temperature determined by the modulating control system. Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 4. Technical description 02092014 - 7619497-02 15
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4.4.6. Regulation of the water temperature The boiler is fitted with an electronic temperature regulator having an outlet and return temperature probe. The flow temperature can be set between 20°C and 90°C. The boiler reduces its power when the set outlet-temperature is attained. The cutout temperature is the set heating outlet-temperature + 5 °C. 4.4.7. Protection against low water or no circulation The boiler is fitted with a safety device to prevent the shortage of water based on temperature measurements. By reducing its output when the water flow rate is in danger of becoming insufficient, the boiler continues to operate as long as possible. In case of insufficient ΔT ≥ 50°C flow or an excessive increase in flow temperature, the boiler will enter shutdown mode for 10 minutes. When there is no water in the boiler, or if the pump is not running, the system is locked (breakdown) In the event of a fault, the status signal for the B button on the connection box flashes red. ¼For more detailed information, see chapter: "Shutdowns and lock-outs", page 63. 4.4.8. Overheat temperature protection The maximum temperature protection locks the boiler if the water temperature becomes too high (110°C). In the event of a fault, the status signal for the B button on the connection box flashes red. ¼For more detailed information, see chapter: "Shutdowns and lock-outs", page 63. Anticycle function is active when heat demand is active and the flow temperature is too high with respect to the setpoint. The anticycle time can be active between 3 and 9 minutes depending on system temperatures. 4.5 Circulating pump (Available pump head) The boiler is fitted with an on/off circulation pump. 1 Combi 24 - 28 2 Combi 35 H Manometric height central heating circuit Q Water flow ( ΔT=20K) R000684-A 1200 1000 600 800 400 200 00 100 200 300 400 500 600 Q (l/h) 1600 1400 700 H (mbar) 1250 30 kW 317 1500 860 1030 20 kW 24 kW 253 127 1 2 4. Technical description Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 16 02092014 - 7619497-02
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System 18 H Manometric height central heating circuit Q Water flow ( ΔT=20K) System 24 H Manometric height central heating circuit Q Water flow ( ΔT=20K) 4.6 Technical specifications Boiler type MainEco Combi 24 Combi 28 Combi 35 System 18 System 24 General EC indentification no. PIN 0063CM3019 Input control Adjustable Modulating, Start/Stop Nominal output (Pn) Heating System (80/60 °C) min - max kW 5.5 - 19.5 5.5 - 23.4 7.7 - 29.2 5.5 - 17.7 5.5 - 23.4 Factory setting kW 19.5 19.5 29.2 17.7 23.4 Nominal output (Pn) Heating System (50/30 °C) min - max kW 6.1 - 20.9 6.1 - 24.8 8.5 - 31.0 6.1 - 18.8 6.1 - 24.8 Factory setting kW 20.9 20.7 31.0 18.8 24.8 Nominal output (Pn) DHW System min - max kW 5.5 - 23.4 5.5 - 27.5 7.7 - 33.9 - - Factory setting kW 23.4 27.5 33.9 - - Nominal input (Qn) Heating System (Hi) min - max kW 5.6 - 20.0 5.6 - 24.0 7.8 - 30.0 5.6 - 18.0 5.6 - 24.0 Factory setting kW 20.0 20.0 30.0 18.0 24.0 Nominal input (Qn) Heating System (Hs) min - max kW 6.2 - 22.2 6.2 - 26.7 8.7 - 33.3 6.2 - 20.0 6.2 - 26.7 Factory setting kW 22.2 22.2 33.3 20.0 26.7 Nominal input (Qnw) DHW System (Hi) min - max kW 5.6 - 24.0 5.6 - 28.2 7.8 - 34.9 - - Factory setting kW 24.0 28.2 34.9 - - Nominal input (Qnw) DHW System (Hs) min - max kW 6.2 - 26.7 6.2 - 31.3 8.7 - 38.8 - - Factory setting kW 26.7 31.3 38.8 - - Heating efficiency under full load (Hi) (80/60 °C) % 97.6 97.6 97.2 98.2 97.6 Heating efficiency under full load (Hi) (50/30 °C) % 104.5 103.3 103.3 104.5 103.3 Heating efficiency under partial load (Hi) (Return temperature 60°C) % 97.8 97.8 98.4 97.8 97.8 Heating efficiency under partial load (Hi) (92/42 EEG) (Return temperature 30°C) % 109.2 109.2 108.8 109.3 109.2 SEDBUK 2005 - 2009 % 90.4 - 89.4 90.3 - 89.3 90.1 - 89.1 90.4 - 89.4 90.3 - 89.3 Data on the gases and combustion gases Equipment categories - I2H Type of air/flue gas connection - C13, C33, C53 Gas inlet pressure G20 min - max mbar 17 - 23 Connecting pressure G20 mbar 20 Gas consumption G20 max m3/h 2.54 2.98 3.68 1.90 2.54 NOx annual emission (n=1) mg/kWh 53 58 52 41 58 Mass flue gas flow rate maximum kg/h 9.4 - 38.7 9.4 - 45.5 13.1 - 56.2 9.4 - 29.1 9.4 - 38.7 (1) Front panel removed R000685-A 1200 1000 600 800 400 200 00 100 200 300 400 500 600 H (mbar) Q (l/h) 1600 1400 775 18 kW 280 R000365-A 1200 1000 600 800 400 200 00 100 200 300 400 500 600 H (mbar) Q (l/h) 1600 1400 860 1030 20 kW 24 kW 253 127 Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 4. Technical description 02092014 - 7619497-02 17
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Boiler type MainEco Combi 24 Combi 28 Combi 35 System 18 System 24 Flue gas temperature min - max °C 32 - 78 32 - 84 31 - 82 32 - 65 32 - 78 Maximum counter pressure Pa 80 116 105 - 80 Characteristics of the heating circuit Water content l 1.6 1.6 1.7 1.4 1.4 Water operating pressure minimum bar 0.8 0.8 0.8 0.8 0.8 Water operating pressure (PMS) maximum bar 2.5 2.5 2.5 2.5 2.5 Water temperature maximum °C 110 110 110 110 110 Operating temperature maximum °C 90 90 90 90 90 Manometric height central heating circuit (ΔT = 20K) mbar 253 127 317 280 275 Characteristics of the domestic hot water circuit Specific hot water flow Rate 35 °C Rise l/min 9.8 11.4 14.3 - - Domestic water resistance (without flow restrictor) mbar 96 123 215 - - Flow rate threshold minimum l/min 1.2 1.2 1.2 - - Water content l 0.16 0.16 0.18 - - Operating pressure (Pmw) maximum bar 8 8 8 - - Electrical characteristics Power supply voltage VAC 230 230 230 230 230 Power consumption - Full load maximum W 105 117 145 92 103 Power consumption - Part load maximum W 82 82 101 82 82 Power consumption - Standby maximum W 3 3 3 3 3 Electrical protection index IP X4D Other characteristics Weight (empty) Total kg 26 26 28.5 25 24.5 Mounting(1) kg 24 24 27 23 23 Acoustic level at 1 metre maximum Heating System dB(A) 38 38 42 38 40 maximum DHW System dB(A) 40 42 45 - - (1) Front panel removed 4. Technical description Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 18 02092014 - 7619497-02
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5 Installation 5.1 Regulations governing installation WARNING The engineer must be Gas Safe registered and have the correct ACS qualifications. Codes of Practice - refer to the most recent version. In GB the following Codes of Practice apply: 4 BS 6891: Gas installation. 4 BS 5546: Installation of hot water supplies for domestic purposes. 4 BS EN 12828: Heating systems in buildings. 4 BS EN 14336: Installation & commissioning of water based heating systems. 4 BS 6798: Installation of gas fired hot water boilers. 4 BS 5440 Part 1: Flues. 4 BS 5440 Part 2: Ventilation. 4 BS 7074: Expansion vessels and ancillary equipment for sealed water systems. 4 BS 7593: Treatment of water in domestic hot water central heating systems. Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 5. Installation 02092014 - 7619497-02 19
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5.2 Choice of the location 5.2.1. Type plate The identification plate on top of the boiler features the boiler serial number and important boiler specifications, for example the model and unit category. The dF and dU codes are also stated on the type plate. 5.2.2. Location of the boiler (1) Clearance when operating (2) Clearance for maintenance 4 Before mounting the boiler, decide on the ideal position for mounting, bearing the Directives and the dimensions of the appliance in mind. 4 Ensure that there is sufficient space under the boiler to fit and remove the condensate trap and the connection box. 4 To ensure adequate accessibility to the appliance and facilitate maintenance, leave enough space around the boiler. 4 Mount the boiler onto a flat surface. R000697-A R000698-A 368 5 1000 (2) 364 ≥ 200 5 ≥ 250 554 5 (1) 5. Installation Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 20 02092014 - 7619497-02
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When choosing the position for mounting the boiler, bear in mind the authorised position of the combustion gas discharge outlets and the air intake opening. ¼For more information, see chapter: "Connections for the air and exhaust pipes", page 29. )For more detailed information, see: Flue Accessories & Fitting Guide. WARNING 4 Fix the appliance to a solid wall capable of bearing the weight of the appliance when full of water and fully equipped. 4 Do not place the appliance above a heat source or a cooking appliance. 4 Do not locate the boiler in direct sunlight. 4 It is forbidden to store inflammable products and materials in the boiler room or close to the boiler, even temporarily. CAUTION 4 The boiler must be installed in a frost-free environment. 4 An earthed electrical connection must be available close to the boiler. 4 A connection to the mains drainage system for the discharge of condensate must be available close to the boiler. n Safety rating Z Zones OZ Breakdown of the exterior zone B Bathtub or shower tray For safety rating IP X4D, installation in the bathroom is possible in zones 2 and 3 and in the breakdown of the exterior zone. In this case, connect the 230 V power supply as a fixed connection to a fused spur. CAUTION In the case of a fixed connection to the power cord, you must always install a main bipolar switch with an opening gap of at least 3 mm (EN 60335-1). T000756-A Z OZ 1 0 B 2 3 60 225 240 Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 5. Installation 02092014 - 7619497-02 21
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5.3 Main dimensions Boiler Connection kit i Connection of the combustion gas exhaust pipe; Ø 60 mm h Connection of the air intake pipe; Ø 100 mm ê Safety valve outlet pipe; Ø 15 mm To Ø 15 mm using supplied adapter j Condensates discharge; Ø 25 mm To Ø 21.5 mm using supplied adapter { Heating circuit flow; G¾" Pipe diameter; Ø 22 mm y Domestic hot water outlet; G½" Pipe diameter; Ø 15 mm Gas / Gaz Gas connection; G½" Pipe diameter; Ø 22 mm x Domestic cold water inlet; G½" Pipe diameter; Ø 15 mm z Heating circuit return; G¾" Pipe diameter; Ø 22 mm (1) Clearance when operating; ≥ 5 mm R000699-B 368 184 364 243 541 209 230 664 151 35 52 1 2 3 4 1 = 117 2 = 184 3 = 251 4 = 316 46 90 187 76 5 (1) 5. Installation Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 22 02092014 - 7619497-02
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5.4 Positioning the boiler The following components are supplied as standard with the boiler: 4 Mounting rail and mounting accessories for wall mounting 4 Connection kit comprising sleeves and clamping rings 4 Condensate trap with drain hose 4 PRV hose 4 Set rubber hose connectors and clips 4 Filling loop 4 Air/Exhaust adapter 4 Thermo-pressure gauge 4 Connection box Please fit these components in the order described in this manual. A suspension clamp situated at the rear of the casing enables the boiler to be directly suspended on the mounting bracket. CAUTION During mounting, cover up the connection points for the air supply and the combustion gas exhaust, to protect the boiler and its connections from dust. Only remove this protection at the time when these connections are made. 1. Determine the position of the two fixing holes. Make sure that the holes are level. Drill 2 holes with a Ø of 8 mm. 2. Insert the rawplugs with a Ø of 8 mm. Secure with Ø 6 mm bolts and corresponding washers. 3. Mount the boiler using the suspension bracket on the back of the boiler. 5.5 Hydraulic connections CAUTION When fitting pipes, remember that the condensate trap will need to be installed and removed. Maintain at least 25 cm distance from the boiler to allow for bends or taps to be installed. R000409-A 1 2 3 R000410-B ≥ 250 mm 235 mm °C bar Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 5. Installation 02092014 - 7619497-02 23
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5.5.1. Flushing the system Installing the boiler in new installations (installations less than 6 months old) 4 Clean the installation with a universal cleaner to eliminate debris from the system (copper, hemp, flux). 4 Thoroughly flush the installation until the water runs clear and shows no impurities. Installing the boiler in existing installations 4 Remove sludge from the installation. 4 Flush the installation. 4 Clean the installation with a universal cleaner to eliminate debris from the system (copper, hemp, flux). 4 Thoroughly flush the installation until the water runs clear and shows no impurities. 5.5.2. Water flow rate The boiler’s modulating control system limits the maximum difference in temperature between the heating flow and return and the maximum speed at which the flow temperature increases. In this way, the boiler does not require a minimum water flow rate. If using a heating and domestic hot water production type boiler on an installation in which the flow can be fully disconnected from the return (e.g. by using thermostatic valves), you should either fit a bypass or fit an expansion vessel to the heating flow conduit. 5.5.3. Connection of the heating circuit 1. Connect the heating water return pipe to the heating return connection z. 2. Install a filling and drainage valve on the installation for filling and draining the boiler. 3. Connect the heating water outlet pipe to the heating flow connection {. 4. Mount the supplied thermomanometer onto the central heating flow connection. Place the thermomanometer no more than 0.5 m away from the boiler. A PRV safety valve is fitted to the flow side of the boiler as standard. R000737-A 1 2 4 3 5. Installation Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 24 02092014 - 7619497-02
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CAUTION 4 The heating pipe must be mounted in accordance with prevailing provisions. 4 Carry out any soldering work required at a safe distance from the boiler or before the boiler is fitted. 4 If you are installing a service shut-off valve, place the filling and drain cock, the expansion vessel and the thermomanometer between the shut-off valve and the boiler. 4 Install a drain under the safety valve leading to the drainage system ê. 5.5.4. Connection of the water circuit for domestic use 1. Connect the cold water inlet pipe to the domestic cold water connection k. 2. Connect the domestic hot water outlet pipe to the domestic hot water connection m. CAUTION 4 The domestic water pipes must be connected in accordance with prevailing provisions. 4 Carry out any soldering work required at a safe distance from the boiler or before the boiler is fitted. 4 If using synthetic pipes, follow the manufacturer’s (connection) instructions. 5.5.5. Connecting the expansion vessel The boiler is fitted as standard with an 8-litre expansion vessel. If the water volume is greater than 100 litres or the static height of the system exceeds 5 metres, an additional expansion vessel must be fitted. Refer to the table below to determine the expansion vessel required for the installation. Conditions of validity of the table: 4 3-bar safety valve 4 Average water temperature: 70 °C Flow temperature: 80 °C Return temperature: 60 °C 4 The filling pressure in the system is lower than or equal to the initial pressure in the expansion vessel Initial pressure of the expansion vessel Volume of the expansion vessel depending on the volume of the installation (in litres) 100 125 150 175 200 250 300 > 300 0.5 bar 4.8 6.0 7.2 8.4 9.6 12.0 14.4 Volume of the installation x 0.048 1 bar 8.0(1) 10.0 12.0 14.0 16.0 20.0 24.0 Volume of the installation x 0.080 1.5 bar 13.3 16.6 20.0 23.3 26.6 33.3 39.9 Volume of the installationx 0.133 (1) Factory configuration R000738-A 1 2 Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 5. Installation 02092014 - 7619497-02 25
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5.5.6. Connecting the safety valve discharge pipe 1. Connect the safety valve pipe to the safety valve outlet ê. CAUTION 4 Any soldering must be completed before fitting the pipework to prevent damage from heat. 4 Do not fit the condensate trap until the discharge pipe has been soldered and fitted. 5.5.7. Connecting the condensate discharge pipe The condensate trap is supplied separately as standard with the boiler (Includes flexible plastic drain hose and adapter). Fit these parts underneath the boiler. To do this, proceed as follows: 1. Fill the condensate trap with water up to the mark. CAUTION Fill the condensate trap with water before starting the boiler to avoid combustion products escaping from the boiler. 2. Press the condensate trap firmly into the j opening provided for it underneath the boiler. The condensate trap must click into place. CAUTION Check whether the condensate trap is solidly fitted in the boiler. 3. Insert the flexible drain hose from the condensate trap into a drain pipe. 4. Mount a trap or a siphon in the discharge pipe. CAUTION Do not make a permanent rigid connection owing to maintenance work on the condensate trap. 4 Do not plug the condensate discharge pipe. 4 Do not drain condensation water into a roof gutter at any time. 4 Connect the condensate discharge pipe in accordance with prevailing standards. R000739-A 1 R000740-A 1 2 3 5. Installation Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 26 02092014 - 7619497-02
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Termination to an internal soil and vent pipe (1) Set the discharge pipe at a gradient of at least 50 mm per metre, maximum horizontal length 5 metres. (2) 450 mm is applicable to properties up to 3 storeys.. For multi-storey building installations consult BS 6798. External termination via internal discharge branch e.g sink waste - downstream (1) Set the discharge pipe at a gradient of at least 50 mm per metre, maximum horizontal length 5 metres. (2) Pipe must terminate above water level but below surrounding surface. Cut end at 45°. It is not recommended to connect upstream of the sink or other waste water receptacle! Termination to a drain or gully (1) Set the discharge pipe at a gradient of at least 50 mm per metre, maximum horizontal length 5 metres. (2) Pipe must terminate above water level but below surrounding surface. Cut end at 45°. Termination to a purpose made soakaway (1) Set the discharge pipe at a gradient of at least 50 mm per metre, maximum horizontal length 5 metres. (2) Holes in the soak-away must face away from the building. Further specific requirements for soakaway design are referred to in BS 6798. R000700-A ≥ 450 (2) ≥ 2.5° (1) R000701-A ≥ 2.5° (1) (2) R000702-A ≥ 2.5° (1) (2) R000703-A ≥ 2.5° (1) ≥ 500 (2) Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 5. Installation 02092014 - 7619497-02 27
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Pumped into an internal discharge branch (e.g. sink waste) downstream of the trap A Basement or similar (heated). (1) Set the discharge pipe at a gradient of at least 50 mm per metre, maximum horizontal length 5 metres. (2) Pipe must terminate above water level but below surrounding surface. Cut end at 45°. (3) Condensate pump. Pumped into an external soil & vent pipe A Basement or similar (heated). B Unheated location (e.g. garage). (1) Set the discharge pipe at a gradient of at least 50 mm per metre, maximum horizontal length 5 metres. (2) Condensate pump. To a drain or gully with extended external run & trace heating (1) Set the discharge pipe at a gradient of at least 50 mm per metre, maximum horizontal length 5 metres. (2) Pipe must terminate above water level but below surrounding surface. Cut end at 45°. The ’Trace Heating’ element must be installed in accordance with the instructions supplied. External runs & those in unheated locations still require insulation. 5.5.8. Automatic air bleed Check that the automatic bleed valve is open: This is visible on the right on top of the boiler. If necessary, the air vent can be closed off with the cap that can be found next to it. R000704-A ≥ 2.5° (1) (3) (2) A R000705-A ≥ 2.5° (1) (2) A B R000706-A ≥ 2.5° (1) (2) R000350-A 5. Installation Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 28 02092014 - 7619497-02
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5.6 Gas connection 1. Connect the gas inlet pipe GAS / GAZ. The pipe must have a diameter of at least 22 mm. WARNING 4 Close the main gas valve before starting work on the gas pipes. 4 Before mounting, check that the gas meter has sufficient capacity. To do this, you should keep in mind the consumption of all domestic appliances. 4 If the gas meter has a too low capacity, inform the energy supply company. CAUTION 4 Connect the gas pipe in accordance with prevailing standards and regulations. 4 Carry out any soldering work required at a safe distance from the boiler or before the boiler is fitted. 4 Ensure that there is no dust in the gas pipe. Blow into the pipe or shake it before mounting. 5.7 Connections for the air and exhaust pipes Only use approved flue gas discharge and air supply materials supplied by BAXI. )For more detailed information, see: Flue Accessories & Fitting Guide. 5.7.1. Classification The table specifies this classification in detail according to [. Type Execution Description C13 Room sealed 4 Vent in the outside wall. 4 The opening for the air-supply inlet is located in the same pressure zone as the vent (For example, a common passage through the outside wall). C33 Room sealed 4 Exhaust of combustion gases above the roof. 4 The opening for the air-supply inlet is located in the same pressure zone as the vent (For example, a concentric passage to the roof). C53 Room sealed 4 Closed equipment. 4 Separate channelling for the air-supply. 4 Separate channelling for the combustion gases. 4 Terminating on different pressure surfaces. R000735-A Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 5. Installation 02092014 - 7619497-02 29
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5.7.2. Outlets When codes of practice dictate the use of a terminal guard use a suitable guard of stainless steel construction. There must be a clearance of at least 50 mm between any part of the terminal and the guard. R000707-A N I I G F M I A A F H J,K D E H Likely flue positions requiring a flue terminal guard C R A I J,K I L S B T U Terminal position with minimum distance A(1) Directly below an opening, air brick, opening windows, etc. 300 mm B(1) Above an opening, air brick, opening window etc. 300 mm C(1) Horizontally to an opening, air brick, opening window etc. 300 mm D(2) Below gutters, soil pipes or drain pipes. 25 (75) mm E(2) Below eaves. 25 (200) mm F(2) Below balconies or car port roof. 25 (200) mm G(2) From a vertical drain pipe or soil pipe. 25 (150) mm H(2) From an internal or external corner. 25 (300) mm I Above ground, roof or balcony level. 300 mm J From a surface or boundary line facing a terminal. 600 mm K From a terminal facing a terminal (Horizontal flue). From a terminal facing a terminal (Vertical flue). 1200 mm 600 mm L From an opening in carport (e.g. door, window) into the dwelling. 1200 mm M Vertically from a terminal on the same wall. 1500 mm N Horizontally from a terminal on the same wall. 300 mm R From adjacent wall to flue (vertical only). 300 mm S From an adjacent opening window (vertical only). 1000 mm T Adjacent to windows or openings on pitched and flat roofs. 600 mm U Below windows or openings on pitched roofs. 2000 mm (1) In addition, the terminal should be no nearer than 150 mm 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 25 mm clearance is allowed per installation. If one of the dimensions D, E, F, G or H is 25 mm then the remainder MUST be as shown in brackets, in accordance with BS 5440-1 5. Installation Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 30 02092014 - 7619497-02
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5.7.3. Lengths of the air/flue gas pipes To define the maximum final length, you must deduct the pipe length in accordance with the reduction table. n Room sealed flue Concentric If using a room sealed version, both the combustion gas exhaust opening and the air supply opening must be connected (concentrically). Refer to the table to determine the maximum pipe length of the flue gas pipes in room sealed operation. Maximum chimney length for room sealed operation Diameter Combi 24 Combi 28 Combi 35 System 18 System 24 60-100 mm 9 m 9 m 5 m 9 m 9 m 80-125 mm 12 m(1) 12 m(1) 12 m(1) 12 m(1) 12 m(1) (1) With retention of the maximum chimney length it is possible to apply an extra 10 times 45° or 5 times 90° elbows Eccentric An 80/80 mm flue gas adapter (accessory) must be fitted for this connection. If using a room sealed version, it is necessary to connect both the combustion gas exhaust and the air-supply opening (parallel). The pipes must be run in parallel and terminate in the same pressure zone using the concentric vertical terminal. Maximum chimney length for room sealed operation Diameter Combi 24 Combi 28 Combi 35 System 18 System 24 80-80 mm 15 m 15 m 15 m 15 m 15 m n Reduction table Pipe reductions per element used Diameter Elbow 45° Elbow 90° Pipe reduction Pipe reduction 60-100 mm 1,0 m 2,0 m 80-125 mm 1,0 m 2,0 m 80 mm 1.2 m(1) 4.0 m(1) (1) Reduction for both air and exhaust R000415-A L = R000719-A L = Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 5. Installation 02092014 - 7619497-02 31
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5.7.4. Additional Directives 4 Please refer to the manufacturer’s instructions for the material in question when installing the flue gas discharge and air supply materials. If the flue gas discharge and air supply materials are not installed according to the instructions (e.g. they are not leakproof, not clamped in place etc.), this may cause hazardous situations and/or result in bodily injury. 4 It must be possible to inspect the flue or chimney. Please contact us for further information. 5.7.5. Connection of the combustion gas exhaust pipe S Insertion depth 30 mm Mounting Fit together the combustion gas exhaust pipes, without welding. CAUTION 4 The flue gas discharge pipe must be smooth and deburred. 4 Do not rest the pipes on the boiler. 4 Take in account the insertion depth of 30 mm when measuring the length of pipe prior to cutting. 4 The pipes must allow no leakage of flue gases and be resistant to corrosion. 4 Connect the pipes together without stress between the sections. 4 The horizontal sections need to be constructed with a gradient of 50 mm per metre: Back to the boiler. 5.8 Electrical connections 5.8.1. Control unit The boiler is not line- and neutral sensitive. The control unit is fully integrated with the fan, venturi and gas block. The boiler is fully pre- wired. The PCB has a connection to the connection box with instrument panel, via the HMI connector. The PCB has a RS232 connection for a PC/laptop via the RS232 connector. The main characteristics of the control unit are described in the table below. Power supply voltage 230 VAC/50Hz Fuse rating F1 (230 VAC) 1,6 AT R000437-A S 60/100mm 5. Installation Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 32 02092014 - 7619497-02
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The boiler is fitted with a 3-wire power supply cable (cable length 1,5 m) suitable for a 230VAC/50Hz power supply with phase/neutral/ earth system. The power supply cable is connected to the MAINS connector. A spare fuse can be found in the housing of the control system. CAUTION 4 When the power supply cable has to be replaced, it must be ordered from BAXI. The power supply cable should only be replaced by BAXI, or by an installer certified by BAXI. 4 The switch must be easily accessible 5.8.2. Recommendations WARNING 4 Only qualified professionals may carry out electrical connections, always with the power off. 4 The boiler is entirely pre-wired. Do not modify the connections inside the control panel. 4 Earth the appliance before making any electrical connections. Make the electrical connections of the boiler according to: 4 The instructions of the prevailing standards. 4 The instructions on the electrical diagrams provided with the boiler. 4 The manufacturer’s instructions. CAUTION Separate the sensor cables from the 230 V cables. Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 5. Installation 02092014 - 7619497-02 33
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5.8.3. Access to the connector block / Boiler HMI The connection box with instrument panel is supplied separately as standard with this unit. The connection box must be connected to the automatic control unit using the cable supplied. To do this, proceed as follows: Under the boiler, there is a cable with a connector for the control unit. 1. Carefully open the latch on the rear of the connection box using a screwdriver. 2. Open the cover of the connection box. 3. Disconnect a pull relief clip. Turn the pull relief clip round. 4. Insert the plug from the cable into the HMI plug on the PCB for the connection box. 5. Press the pull relief clip firmly into place. 6. Now connect the required external controllers to the remaining connectors. To do this, proceed as follows: - Disconnect a pull relief clip. - Turn the pull relief clip round. - Place the cable underneath the pull relief clip. - Press the pull relief clip firmly into place. - Connect the connection box and check that the box is sealed properly. 7. Slide the User instruction card supplied into the guides underneath the connection box. 8. Slide the connection box into the guides underneath the boiler once all the connections have been made. 9. Secure the connection box using the screw found in the guides. The connection box can also be attached to the wall using the screw holes on the back of the connection box. The connection box should be screwed to the wall using the fixing points inside the unit. The connection options for external system controls to the boiler HMI are explained in the following paragraphs. )For more detailed information, see: Connecting External Controls Sheet. 5.8.4. Connection options Various external thermostats and controllers can be connected to the control PCB. A Mains voltage B Low voltage On/off-OT connection is only suitable for: 4 24V power stealing thermostat 4 Potential free on/off thermostat 4 OT thermostat (iSense or qSense) R000411-C 8 9 7 6 4 SCU HMI OT On/of BUS BUS 5 3 2 1 R000734-A 1 2 3 4 5 6 3 4 1 2 1 2 1 2 3 On/off OT Enable + - + - CH DHW Status Nc C No Tout Tdhw BL SCU BUS BUS HMI A B 5. Installation Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 34 02092014 - 7619497-02
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Please read in conjunction with separate sheet "Connecting External Controls". n Connecting modulating controller The boiler is fitted with a OpenTherm connection as standard. As a result, modulating OpenTherm controllers can be connected without further modifications. 4 In the case of a room temperature thermostat or a programmable room thermostat, fit the thermostat in accordance with the manufacturer’s instructions. 4 Connect the two-wire cable to terminals On/off-OT of the connector. n Connect on/off thermostat The boiler is suitable for connecting a 2 wire on/off room thermostat or weather compensator. 4 In the case of a room temperature thermostat or a programmable room thermostat, fit the thermostat in accordance with the manufacturer’s instructions. 4 Connect the 2 wire 24V room thermostat to the On/off-OT terminals of the connector. 4 Connect the power stealing thermostat to the On/off-OT terminals of the connector. n Connecting the outside temperature sensor An outside sensor can be connected to the Tout terminals of the connector. In the case of an on/off thermostat, the boiler will control the temperature with the set point from the internal heating curve. CAUTION Check whether the outside sensor is suitable for this boiler. A suitable outside sensor can be obtained as an accessory. A OpenTherm controller can also use this outside sensor. The heating curve required must then be set on the controller. Heating curve setting If an outside temperature sensor is connected, it is possible to adapt the heating curve. The setting can be modified using parameters p1, p"5, p"6 and p"7. This is only possible with an iSense or qSense. R000450-A 1 2 3 4 5 6 3 4 1 2 1 2 1 2 3 On/off OT Enable + - + - CH DHW Status Nc C No Tout Tdhw BL SCU BUS BUS HMI R000450-A 1 2 3 4 5 6 3 4 1 2 1 2 1 2 3 On/off OT Enable + - + - CH DHW Status Nc C No Tout Tdhw BL SCU BUS BUS HMI R000451-A 1 2 3 4 5 6 3 4 1 2 1 2 1 2 3 On/off OT Enable + - + - CH DHW Status Nc C No Tout Tdhw BL SCU BUS BUS HMI R000038-A 0 10 20 -20 -10 10 30 70 50 90 F Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 5. Installation 02092014 - 7619497-02 35
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n Connect frost protection Frost protection in combination with on/off thermostat If an on/off thermostat is used, it is advisable to protect any rooms where there is risk of frost by using a frost thermostat. The radiator valve in a room where there is a risk of frost must be open. 4 In rooms where there is a risk of frost, a frost thermostat (Tv) should preferably be installed. 4 Connect the frost thermostat in parallel with an on/off room thermostat (Tk) to the On/off-OT terminals of the connector. When using a OpenTherm thermostat, a frost thermostat cannot be connected in parallel to the On/off-OT terminals. Implement frost protection for the central heating system in combination with an external sensor. Frost protection in combination with an outside sensor The central heating system can also be protected against frost in combination with an outside sensor. The radiator valve in a room where there is a risk of frost must be open. Connect the outside sensor to the Tout terminals of the connector. The frost protection functions as follows where an outside sensor is used: 4 At an outside temperature lower than -10°C (can be set with parameter p30): the circulation pump switches on. 4 At an outside temperature higher than -10°C (can be set with parameter p30): the circulation pump continues to run and then switches off. This is only possible with an iSense or qSense. n Operation signal and failure signal (Status) The alarm or operation signal is selected using parameter p40. 4 If the boiler is operating, the operation signal can be switched via a potential-free contact (maximum 230 VAC, 1 A) on the No and C terminals of the connector. 4 If the boiler locks out, the alarm can be transmitted via a potential- free contact (maximum 230 VAC, 1 A) on the Nc and C terminals of the connector. 4 The external 3-way valve (230 VAC, 1 A) can be used when connecting an indirectly heated calorifier via a volt-free contact. The neutral position of the three-way valve can be set using parameter p34. The three-way valve is connected as follows: - Nc = Central heating - No = Domestic hot water - C = Phase on 4 This is only possible with an iSense or qSense. 4 Status connection can be used for standalone condensate pump. R000450-A 1 2 3 4 5 6 3 4 1 2 1 2 1 2 3 On/off OT Enable + - + - CH DHW Status Nc C No Tout Tdhw BL SCU BUS BUS HMI R000451-A 1 2 3 4 5 6 3 4 1 2 1 2 1 2 3 On/off OT Enable + - + - CH DHW Status Nc C No Tout Tdhw BL SCU BUS BUS HMI R000453-A 1 2 3 4 5 6 3 4 1 2 1 2 1 2 3 On/off OT Enable + - + - CH DHW Status Nc C No Tout Tdhw BL SCU BUS BUS HMI 5. Installation Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 36 02092014 - 7619497-02
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n Connect on/off contact (Enable) A 10-230 V signal can be connected to the CH and DHW connectors to switch the production of heating water or sanitary warm water on or off. 4 + = L 4 - = N DANGER If the power to the boiler is interrupted, a voltage will still be present at connectors CH and DHW. When using the Enable-CH connection a bridge must be placed on the On/off-OT terminals of the connector. The production of heating water or domestic hot water is switched on as standard. The automatic control unit will only respond to the switch and control the heating/ domestic hot water function once a 10-230 V signal has been connected to the connectors. If the power to the boiler is interrupted, the status of the CH and DHW input will be reset to the factory setting (= enabled). Check whether this is the status required. n Connecting control panel The control panel for the boiler is connected to connector BUS HMI. ¼See chapter: "Access to the connector block / Boiler HMI", page 34 R000718-A 1 2 3 4 5 6 3 4 1 2 1 2 1 2 3 On/off OT Enable + - + - CH DHW Status Nc C No Tout Tdhw BL SCU BUS BUS HMI R000448-A 1 2 3 4 5 6 3 4 1 2 1 2 1 2 3 On/off OT Enable + - + - CH DHW Status Nc C No Tout Tdhw BL SCU BUS BUS HMI Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 5. Installation 02092014 - 7619497-02 37
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5.9 Electrical diagram R000291-A P 230V, 50Hz L N MAINS 1 3 2 BR BL GN/ YW PC RS232 1 2 1 2 1 2 2 3 1 PSU TA TR FS HL 6 7 8 9 10 11 12 13 1 2 3 5 SENSORS E IT IT HMI MAINS SENSORS PUMP PWM PUMP 3WV RS232 PUMP PUMP A 1 2 3 BK BL GN/ YW 3WV 3WV 1 2 3 BK BL BR 1 3 2 PUMP 1 2 3 4 BK BK PWM PUMP RS232 Connecting a computer PUMP A Circulation pump TR Return sensor IT Ignition transformer 3WV 3-way valve TA Flow sensor E Ignition/ionization electrode HL Safety thermostat PSU Storage parameter P Power supply FS Flow switch HMI Connection box 5.10 Filling the system 5.10.1. Water treatment WARNING Do not add chemical products to the central heating water without consulting BAXI. For example: antifreeze, water softeners and/or products to increase or reduce the pH value. These may cause faults in the boiler and damage the heat exchanger. Flush the central heating installation with at least 3x the volume of the central heating installation. Flush the DHW pipes with at least 20 times the volume of the pipes. For an optimum functioning of the boiler, the water of the installation must comply with following characteristics: 5. Installation Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 38 02092014 - 7619497-02
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Total installed heat output (kW) ≤ 70 70 - 200 200 - 550 > 550 Degree of acidity (water non-treated) pH 7 - 9 7 - 9 7 - 9 7 - 9 Degree of acidity (water treated) pH 7 - 8.5 7 - 8.5 7 - 8.5 7 - 8.5 Conductivity at 25°C µS/cm ≤ 800 ≤ 800 ≤ 800 ≤ 800 Chlorides mg/l ≤ 150 ≤ 150 ≤ 150 ≤ 150 Other components mg/l < 1 < 1 < 1 < 1 Total water hardness(1) °f 1 - 35 1 - 20 1 - 15 1 - 5 °dH 0.5 - 20.0 0.5 - 11.2 0.5 - 8.4 0.5 - 2.8 mmol/l 0.1 - 3.5 0.1 - 2.0 0.1 - 1.5 0.1 - 0.5 (1) For installations that are heated at constant high temperatures with a total installed heat output; up to 200 kW a maximum total water hardness of 8.4 °dH (1.5 mmol/l, 15 °f) applies and for above 200 kW a maximum total water hardness of 2.8 °dH (0.5 mmol/l, 5 °f) applies Failure to flush and add inhibitor to the system will invalidate the appliance warranty. Reputable manufacturers and their products include: 4 Fernox 4 Sentinel Performance Solution Ltd 5.10.2. Filling the condensate trap Check whether the condensate trap is filled up to the mark. If the condensate trap has to be topped up, proceed as follows: CAUTION First remove the front housing of the boiler so that you can disconnect the condensate trap. ¼See paragraph: "Open the boiler", page 53 1. Move the lever underneath the hydroblock to the right to disconnect the condensate trap. 2. Remove the condensate trap and clean it. 3. Replace the seal ring for the condensate trap. 4. Fill the condensate trap with water up to the mark. 5. Press the condensate trap firmly into the j opening provided for it underneath the boiler. The condensate trap must click into place. 6. Check whether the condensate trap is solidly fitted in the boiler. CAUTION Fill the condensate trap with water before starting the boiler to avoid combustion products escaping from the boiler. R000431-B 6 5 2 4 3 1 Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 5. Installation 02092014 - 7619497-02 39
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5.10.3. Filling the system CAUTION 4 Before filling, open the valves on every radiator in the installation. 4 Ensure that the boiler is switched off. 1. Fill the system with clean tap water (advised water pressure is between 1 and 2 bar). 2. Check the tightness of the water connections. 3. Turn the boiler on. After the power is switched on, the boiler always runs through an automatic venting programme lasting approx. 4 minutes (During filling, air can escape from the system via the automatic air vent). If necessary, top up the water level in the heating system (recommended hydraulic pressure between 1 and 2 bar). CAUTION When venting, ensure that no water enters or makes contact with the casing and electrical parts of the boiler. 1 2 3 4 T000181-B R000733-A 4 20 120 50 100 °C bar 0 3 1 2 5. Installation Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 40 02092014 - 7619497-02
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5.10.4. Venting the system It is essential that you bleed any air in the calorifier, the conduits or the taps to prevent the annoying noises likely to be produced during heating or when tapping water. To do this, proceed as follows: 1. Open the valves on all radiators connected to the heating system. 2. Set the room thermostat as high as possible. 3. Wait until the radiators are hot. 4. Ensure that the boiler is switched off. 5. Wait around 10 minutes until the radiators are cold. 6. Bleed the radiators. Start with the lower floors. 7. Open the bleed connection using the bleed key provided whilst keeping a rag pressed against the bleed connection. CAUTION The water may still be hot. 8. Wait until water comes out of the bleed valve and then close the bleed connection. 9. Turn the boiler on. A vent cycle of a duration of around 4 minutes is carried out automatically. 10.After venting, check whether the pressure in the installation is still sufficient. If the water pressure is lower than 0.8 bar, more water should be added. If necessary, top up the water level in the heating system (recommended hydraulic pressure between 1 and 2 bar). ¼See chapter: "Filling the system", page 40 11.Set the room thermostat or the regulator. R000712-A 8 7 A C B 6 5 4 3 2 1 2 3 4 1 11 Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 5. Installation 02092014 - 7619497-02 41
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6 Commissioning 6.1 Control panel MainEco Combi 24 - 28 - 35 1 Domestic hot water temperature rotary knob 2 Heating water temperature rotary knob 3 Sweep key B and Status signals 4 RESET-button and on/off signal MainEco System 18 - 24 1 No function 2 Heating water temperature rotary knob 3 Sweep key B and Status signals 4 RESET-button and on/off signal The instrument panel for the connection box has 2 push buttons with signals. The signals provide information about the operating condition of the boiler. The RESET button lights up green when the boiler is connected to the mains. The status signal for the B button can flash in a range of colours and at different frequencies. The meaning of these signals can be found in the User instruction card supplied with the boiler. ¼See also: "User instruction card", page 71 CAUTION The instruction card must be slid underneath the connection box after the boiler installation or use of the card. The instrument panel for the connection box also has 2 rotary knobs. The N rotary knob can be used to set the temperature of the domestic hot water. The D rotary knob can be used to set the maximum flow temperature of the heating water. The heating/ domestic hot water function can be switched off by turning the rotary knob to position off. T002247-D 3 2 1 4 R000714-A 3 2 1 4 6. Commissioning Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 42 02092014 - 7619497-02
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6.2 Check points before commissioning 6.2.1. Preparing the boiler for commissioning WARNING Do not put the boiler into operation if the supplied gas is not in accordance with the approved gas types. Preparatory procedure for boiler commissioning: 4 Check that the gas type supplied matches the data shown on the boiler’s data plate. 4 Check the hydraulic circuit. 4 Check the water pressure in the heating system. 4 Check the electrical connections to the thermostat and the other external controls. 4 Check the other connections. 6.2.2. Hydraulic circuit 4 Use the pressure gauge to check the water pressure in the heating system. The hydraulic pressure must reach a minimum of 0.8 bar. If necessary, top up the water level in the heating system (recommended hydraulic pressure between 1 and 2 bar). 4 Check the condensate discharge trap; it must be filled with clean water up to the mark. 4 Check that there are no leaks on the hydraulic connections. 6.2.3. Electrical connections 4 Check the electrical connections, particularly the earth. 4 Check the electrical connections to the thermostat and the other external controls. 6.3 Commissioning the boiler WARNING Initial commissioning must be done by a qualified professional. Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 6. Commissioning 02092014 - 7619497-02 43
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CAUTION On first firing the boiler, an odour may be present for a short period. 1. Open the main gas supply. 2. Open the gas valve on the boiler. 3. Turn the boiler on. 4. Set the controls (thermostats, control system) so that they request heat. 5. The boiler will begin an automatic venting-programme (which lasts approx. 4 minutes) and will do this every time the power supply is isolated. Both push buttons on the instrument panel light up green during the venting cycle. The boiler will begin an automatic venting-programme (which lasts approx. 4 minutes) and will do this every time the power supply is isolated. 6. Check the boiler pump venting. Remove the middle screw if necessary before venting the pump (Central heating pump). 7. Check the gas connections into and out of the gas block in the boiler for tightness. The current operating condition of the boiler is shown by the status signal on the instrument panel. The status signal for the B button can flash in a range of colours and at different frequencies. The meaning of these signals can be found in the User instruction card supplied with the boiler. See also: ¼ "User instruction card", page 71 ¼ "Error codes", page 63 Error during the start-up procedure: 4 Both buttons on the instrument panel are in the out position: - Check the mains supply voltage - Check the main fuses - Check the connection cable to the connection box. - Check the fuses on the control panel: (F1 = 1,6 AT 230VAC) - Check the connection between the mains lead and the MAINS connector for the automatic control unit. 4 In the event of a fault, the status signal for the B button flashes red. Press the J button for 5 seconds to restart the boiler. 6. Commissioning Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 44 02092014 - 7619497-02
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6.4 Gas settings The boiler is preset in the factory to operate on natural gas G20. 6.4.1. Gas circuit WARNING Ensure that the boiler is switched off. 1. Remove the front panel. ¼See paragraph: "Open the boiler", page 53 2. Check that the boiler is properly set for the type of gas used (See the identification plate on top of the boiler ). WARNING ¼To ascertain the gas types permitted, see chapter: "Technical specifications", page 17 3. Open the main gas supply. 4. Open the gas valve on the boiler. 5. Check the gas supply pressure at the pressure test point C on the gas inlet pipe. The pressure must be the same as the one shown on the rating plate. See the diagram for the position of measuring point C for the inlet gas pressure. 6. Purge the gas supply pipe by unscrewing the screw from the measure point C. Tighten the measurement point when the pipe has been sufficiently purged. 7. Check the leak tightness of the gas pipe, including the gas block. 6.4.2. Checking combustion 1. Unscrew the plug of the flue gas measurement point. 2. Insert the probe for the flue gas analyser into the measurement opening. WARNING Ensure that the opening around the sensor is completely sealed when taking measurements. CAUTION The flue gas analyser must have a minimum accuracy of ±0.25% CO2. R000736-A C T003127-B Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 6. Commissioning 02092014 - 7619497-02 45
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n Set the boiler to full load 1. Continue pressing for around 3 seconds on the B key. The status signal for the B button is orange and always flashes green briefly; Part load is set. 2. Press the B button again 2 times. The status signal for the B button is orange and always goes off briefly 2 times; Full load is set. The full load status can only be reached via the part load status. 3. Measure the percentage CO2 in the flue gases (Front panel removed). Full load CO2 must be between 9.15 and 9.50 %. n Set the boiler to part load 1. Continue pressing for around 3 seconds on the B key. The status signal for the B button is orange and always flashes green briefly; Part load is set. 2. Measure the percentage CO2 in the flue gases (Front panel removed). Part load CO2 must be between 8.70 and 9.05 %. WARNING There MUST remain a "gap" between the full load and part load values. The full load value must be 0.4% higher than the part load value. 3. Briefly press the RESET button to return the boiler to normal operating status. 6. Commissioning Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 46 02092014 - 7619497-02
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R000715-A TURN APPLIANCE OFF ! Call 0844 871 1555 for advice. The appliance MUST NOT be commissioned until all problems are identified and resolved. If commissioning cannot befully 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 0844 871 1555. Yes Is CO < 350ppm and CO/CO2 ratio < 0.004 ? No 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. Is CO < 350ppm and CO/CO2 ratio < 0.004 ? 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. Set Boiler to Minimum Rate Allow the combustion to stabilise. Do not insert probe to avoid ‘flooding’ the analyser. 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 ? Yes No 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. TURN APPLIANCE OFF ! Call 0844 871 1555 for advice. The appliance MUST NOT be commissioned until all problems are identified and resolved. No Yes 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% ? Yes No Perform Flue Integrity Combustion Check Insert the analyser probe into the air inlet test point, allowing the reading to stabilise. Set Boiler to Maximum Rate Allow the combustion to stabilise. Do not insert probe to avoid ‘flooding’ the analyser. Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 6. Commissioning 02092014 - 7619497-02 47
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6.4.3. Setting the air/gas ratio 1. Unscrew the plug of the flue gas measurement point. 2. Insert the probe for the flue gas analyser into the measurement opening. WARNING Ensure that the opening around the sensor is completely sealed when taking measurements. CAUTION The flue gas analyser must have a minimum accuracy of ±0.25% CO2. n Set the boiler to full load 1. Continue pressing for around 3 seconds on the B key. The status signal for the B button is orange and always flashes green briefly; Part load is set. 2. Press the B button again 2 times. The status signal for the B button is orange and always goes off briefly 2 times; Full load is set. 4 The full load status can only be reached via the part load status. 4 See drawing for the position of control screw A for full load. 3. Set the percentage CO2 for the gas type being used to the nominal value. This should always be inside the highest and lowest setting limit. 4 If the percentage CO2 is too low, turn the screw A anticlockwise for a higher percentage. 4 If the percentage CO2 is too high, turn the screw A clockwise for a lower percentage. Full load CO2 must be between 9.15 and 9.50 %. n Set the boiler to part load 1. Continue pressing for around 3 seconds on the B key. The status signal for the B button is orange and always flashes green briefly; The low speed mode is parameterised. See drawing for the position of control screw B for part load. T003127-B R000592-B A B R000591-B A B B 6. Commissioning Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 48 02092014 - 7619497-02
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2. Set the percentage CO2 for the gas type being used inside the highest and the lowest setting limit, as determined after the full load setting. (Front panel removed). 4 If the percentage CO2 is too high, turn the screw B anticlockwise for a lower percentage. 4 If the percentage CO2 is too low, turn the screw B clockwise for a higher percentage. Part load CO2 must be between 8.70 and 9.05 %. WARNING There MUST remain a "gap" between the full load and part load values. The full load value must be 0.4% higher than the part load value. 3. Briefly press the RESET button to return the boiler to normal operating status. 6.5 Finalizing work 1. Remove the measuring equipment. 2. Put the flue gas sampling plug back in place. 3. Refit the front panel. 4. Raise the temperature in the heating system to approximately 70°C. 5. Shut down the boiler. 6. After about 10 minutes, vent the air in the heating system. 7. Switch on the boiler. 8. Check the tightness of the flue gases evacuation and air inlet connections. 9. Checking the hydraulic pressure. If necessary, top up the water level in the heating system (recommended hydraulic pressure between 1 and 2 bar). 10.Tick the gas category used on the data plate. 11.Explain the operation of the installation, the boiler and the regulator to the users. 12.Slide the User instruction card supplied into the guides underneath the connection box. 13.Fill in Commissioning sheet, can be found in the appendix. 14.Give all the instruction manuals to the user. T001522-A Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 6. Commissioning 02092014 - 7619497-02 49
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6.6 Parameter descriptions Parameter Description Adjustment range Factory setting Combi System 24 28 35 18 24 p1 Flow temperature: TSET 20 to 90 °C 80 80 80 80 80 p2 Domestic hot water temperature: TSET 40 to 65 °C 55 55 55 55 55 p3 Heating / DHW mode 0 = Heating deactivated / DHW deactivated 1 = Heating activated / DHW activated 2 = Heating activated / DHW deactivated 3 = Heating deactivated / DHW activated 1 1 1 1 1 p4 ECO mode 0 = Comfort 1 = Energy-saving mode 2 = Management using a programmable thermostat 2 2 2 2 2 p5 Post-circulation of the pump 1 to 98 minutes 99 minutes = continuous 2 2 2 2 2 p17 Maximum fan volume flow (Heating) G20 (x100) 39 39 60 36 47 p18 Maximum fan volume flow (DHW) G20 (x100) 47 56 70 36 47 p19 Minimum fan volume flow (Heating +DHW) G20 (x100) 11 11 15 11 11 p20 Minimum fan volume flow (offset) G20 80 80 60 80 80 p21 Starting volume flow Do not modify (x100) 23 23 30 23 23 p23 Maximum flow temperature of system 20 to 90 °C 90 90 90 90 90 p24 Time factor of average flow calculation Do not modify (x10 seconds) 35 35 35 35 35 p25 Heat curve set point (Maximum outside temperature) 0 to 30 °C (Only with an outside temperature sensor) 20 20 20 20 20 p26 Heat curve set point (Flow temperature) 0 to 90 °C (Only with an outside temperature sensor) 20 20 20 20 20 p27 Heat curve set point (Minimum outside temperature) -30 to 0 °C (Only with an outside temperature sensor) -15 -15 -15 -15 -15 p28 Minimum pump speed for central heating operation (Setting the pump speed) 2 - 10 (x 10 %) 2 2 2 2 2 p29 Maximum pump speed for central heating operation (Setting the pump speed) 2 - 10 (x 10 %) 7 7 10 10 10 p30 Antifreeze temperature from - 30 to 0°C -10 -10 -10 -10 -10 p31 Legionella protection 0 = Stop 1 = Start(1) 2 = Management using a programmable thermostat 1 1 1 1 1 p32 Set point increase for calorifier 0 to 25 °C 15 15 15 15 15 p33 DHW cut-in temperature DHW sensor from 2 to 15°C 4 4 4 4 4 p34 Control of external 3-way valve 0 = Normal 1 = Reverse 0 0 0 0 0 p35 Boiler type 0 = Heating and instant domestic hot water 1 = Heating only 0 0 0 1 1 (1) After commissioning, the boiler will operate once a week at 65°C for DHW. 6. Commissioning Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 50 02092014 - 7619497-02
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Parameter Description Adjustment range Factory setting Combi System 24 28 35 18 24 p36 Shutdown input function 1 = Shutdown without frost-protection 2 = Shutdown with frost protection 3 = Lock-out with frost protection (Pump only) 1 1 1 1 1 p37 Minimum gas pressure switch (GpS) 0 = Not connected 1 = Connected 0 0 0 0 0 p38 Heat recovery unit (HRU) 0 = Not connected 1 = Connected 0 0 0 0 0 p39 Flue gas damper running time 0 to 255 seconds 0 0 0 0 0 p40 Fault relay function 0 = Operation signal 1 = Alarm signal 2 = External 3-way valve 2 2 2 2 2 p41 Maintenance message Do not modify 0 0 0 0 0 p42 Service operating hours Do not modify 175 175 175 175 175 p43 Service burning hours Do not modify 30 30 30 30 30 p44 Venting cycle 0 = Stop 1 = Multiple speed pump 2 = Modulating pump 1 1 1 1 1 (1) After commissioning, the boiler will operate once a week at 65°C for DHW. Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 6. Commissioning 02092014 - 7619497-02 51
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7 Switching off the boiler 7.1 Installation shutdown If the central heating system is not used for a long period, we recommend switching the boiler off. 4 Switch off the boiler electrical power supply. 4 Shut off the gas supply. 4 Ensure that the boiler and system are protected against frost damage. 7.2 Antifreeze protection CAUTION Drain the boiler and central heating system if you are not going to use your home or the building for a long time and there is a chance of frost. Set the temperature control low, for example at 10°C. To prevent radiators and the system from freezing in rooms where there is a risk of frost (e.g. a garage or storage room), a frost thermostat or outside sensor can be connected to the boiler. ¼See also: "Connection options", page 34. CAUTION 4 The antifreeze protection does not function if the boiler is switched off. 4 The integrated protection system only protects the boiler, not the installation. 4 Open the valves on all radiators connected to the heating system 4 If the boiler has been placed in a room at risk of frost, the condensate drain and condensate trap should preferably be protected against freezing with a frost protection cable. When the heating water temperature in the boiler falls by too much, the integrated protection system in the boiler starts up. This protection functions as follows: 4 If the water temperature is lower than 7°C, the heating pump starts up. 4 If the water temperature is lower than 4°C, the boiler starts up. 4 If the water temperature is higher than 10°C, the boiler shuts down and the circulation pump continues to run for a short time. 7. Switching off the boiler Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 52 02092014 - 7619497-02
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8 Checking and maintenance 8.1 General instructions WARNING 4 Maintenance operations must be done by a qualified engineer. 4 An annual inspection is compulsory. 4 Only original spare parts must be used. 4 Carry out the inspection and standard maintenance operations once a year. 4 Carry out specific maintenance operations if necessary. 8.2 Standard inspection and maintenance operations WARNING Ensure that the boiler is switched off. Electrical isolation can be checked at the electrical test point. CAUTION 4 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. 4 Use only original spare parts that are intended for use with this type of boiler. 8.2.1. Open the boiler 1. Unscrew the 2 screws, located on the front panel. R000695-B R000346-A 1 1 Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 8. Checking and maintenance 02092014 - 7619497-02 53
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2. Remove the front panel. 8.2.2. Checking the hydraulic pressure The hydraulic pressure must reach a minimum of 0.8 bar. If necessary, top up the water level in the heating system (recommended hydraulic pressure between 1 and 2 bar). CAUTION 4 Before filling, open the valves on every radiator in the installation. 4 Ensure that the boiler is switched off. 1. Fill the system with clean tap water (advised water pressure is between 1 and 2 bar). 2. Check the tightness of the water connections. 3. Turn the boiler on. 8.2.3. Checking the expansion vessel Check the expansion vessel and replace it if necessary. Initial pressure of the expansion vessel is 1.0 bar (± 0.2). 8.2.4. Checking the ionization current Check the ionization current at full load and low load. The value is stable after 1 minute. If the value lies below 3 µA, replace the ignition electrode. ¼See chapter: "Replacing the ionization/ignition electrode", page 58. R000405-A 2 2 3 R000733-A 4 20 120 50 100 °C bar 0 3 1 2 8. Checking and maintenance Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 54 02092014 - 7619497-02
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8.2.5. Checking the DHW transfer capacity If tap capacity falls significantly (due to insufficient temperature and/ or flow rate), clean the plate heat exchanger (hot water side) and the tap water cartridge: ¼See chapter: "Cleaning the plate heat exchanger", page 59. 8.2.6. Checking the flue gas discharge and the air supply Check the tightness of the flue gases evacuation and air inlet connections. 8.2.7. Checking combustion Measure the percentage CO2 in the flue gases. To do this, proceed as follows: 1. Heat the water in the boiler to a temperature of approx. 70 °C. Allow the combustion to stabilise before inserting the combustion analyser probe into the measurement opening. This will prevent saturation of the analyser. 2. Unscrew the plug of the flue gas measurement point. 3. Insert the probe for the flue gas analyser into the measurement opening. 4. Measure the percentage CO2 in the flue gases. Perform measurements at full capacity and low capacity. Compare this with the control value. ¼For further information: See chapter: "Checking combustion", page 45 8.2.8. Checking the automatic air vent 1. Check that the automatic bleed is working (This is visible on the right on top of the boiler). 2. The air vent can be closed off with the cap that can be found next to it. 3. If any leaks are detected, replace the air vent. R000406-A T003127-B R000350-A Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 8. Checking and maintenance 02092014 - 7619497-02 55
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8.2.9. Checking the condensate trap CAUTION First remove the front housing of the boiler so that you can disconnect the condensate trap. 1. Move the lever underneath the hydroblock to the right to disconnect the condensate trap. 2. Remove the condensate trap and clean it. 3. Replace the seal ring for the condensate trap. 4. Fill the condensate trap with water up to the mark. 5. Press the condensate trap firmly into the j opening provided for it underneath the boiler. The condensate trap must click into place. 6. Check whether the condensate trap is solidly fitted in the boiler. R000431-B 6 5 2 4 3 1 8. Checking and maintenance Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 56 02092014 - 7619497-02
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8.2.10. Checking the burner and cleaning the heat exchanger 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. 1. Ensure that the boiler is switched off. Close the gas valve of the boiler. Remove the front panel. 2. Take the bracket off the flue gas discharge pipe. Remove the flue gas discharge pipe. 3. Remove the air inlet flue on the venturi. 4. Unscrew the gland underneath the gas block. 5. Open the protective cover for the fan on the top and remove all the plugs from the PCB. 6. Close the fan’s protective cover. 7. Disassemble the ignition electrode. Check the ignition electrode for wear. Replace if necessary. ¼See also: "Replacing the ionization/ignition electrode", page 58 8. Unclip the 2 locking clips that attach the gas/air unit to the heat exchanger. 9. Remove the gas/air unit by moving the gas/air unit upwards and then forwards. 10.Tilt the burner and remove it, along with the heat exchanger gasket. 11.Use a vacuum cleaner fitted with a special endpiece (accessory) to clean the top part of the heat exchanger (combustion chamber). 12.Thoroughly clean with the vacuum cleaner again without the top cleaning brush on the endpiece. 13.Check (using a mirror, for example) whether any dust can still be seen. If so, hoover it up. 14.The burner does not require any maintenance, it is self-cleaning. Check that there are no cracks and/or other tears on the surface of the dismantled burner. If this is not the case, replace the burner. 15.Install the ignition electrode. 16.To re-assemble, perform the above actions in reverse order. CAUTION 4 Remember to replace the plugs on the PCB for the gas/air unit. 4 Check that the gasket is correctly positioned between the mixing elbow and the heat exchanger. (Completely flat in the appropriate groove means it is leak proof). 17.Open the gas inlet valves and switch on the mains supply to the boiler. T004777-B 5 2 10 7 11 12 13 14 15 16 17 4 2 5 9 8 3 6 Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 8. Checking and maintenance 02092014 - 7619497-02 57
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8.3 Specific maintenance operations WARNING Ensure that the boiler is switched off. Electrical isolation can be checked at the electrical test point. CAUTION 4 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. 4 Use only original spare parts that are intended for use with this type of boiler. If the standard inspection and maintenance operations have revealed the necessity to carry out additional maintenance work, proceed as follows, depending on the nature of the work: 8.3.1. Replacing the ionization/ignition electrode Replace the ionization/ignition electrode in the following cases: 4 Ionization current <3 µA. 4 Electrode worn. 1. Open the protective cover for the fan at the top. 2. Remove the ignition electrode plugs from the PCB. 3. Unscrew the 2 screws on the ignition electrode. Remove the unit. 4. Fit the new ionisation/ignition electrode. 5. To re-assemble, perform the above actions in reverse order. R000695-B R000433-A 2 2 1 3 8. Checking and maintenance Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 58 02092014 - 7619497-02
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8.3.2. Replacing the 3-way valve If it becomes necessary to replace the 3-way valve, proceed as follows: 1. Close the main water valve. 2. Drain the boiler: - Open a domestic hot water tap to release the pressure and drain any water from the circuit. - Connect the filling loop to the heating return connection. - Open the isolation tap and drain the circuit into a suitable receptacle. - When the water has stopped flowing, close all the isolation taps. 3. Open the protective cover for the fan at the top. 4. Disconnect the three-way valve cable from the automatic control unit. 5. Unclip the locking clip that holds the 3-way valve. 6. Dismantle the 3-way valve by rotating a screwdriver. 7. Remove the 3-way valve. 8. To re-assemble, perform the above actions in reverse order. CAUTION Be careful of the positioning cams on the 3-way valve. 8.3.3. Cleaning the plate heat exchanger Depending on the water quality and the operating mode, limescale deposits may form in the plate exchanger. As a general rule, a periodic inspection, along with cleaning, if necessary, is sufficient. The following factors may affect the periodicity: 4 Water hardness. 4 Composition of the limescale. 4 Number of hours’ operation of the boiler. 4 Draw-off rate. 4 Domestic hot water set point temperature. R000400-A 4 3 6 5 7 2 1 Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 8. Checking and maintenance 02092014 - 7619497-02 59
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If descaling of the plate exchanger is necessary, proceed as follows: 1. Ensure that the boiler is switched off. 2. Close the gas valve of the boiler. 3. Close the main water valve. 4. Drain the boiler: - Open a domestic hot water tap to release the pressure and drain any water from the circuit. - Connect the filling loop to the heating return connection. - Open the isolation tap and drain the circuit into a suitable receptacle. - When the water has stopped flowing, close all the isolation taps. 5. Unscrew the screw on the left-hand side of the heat exchanger. 6. Remove the plate heat exchanger by moving the left-hand side forwards and tipping the right-hand side out of the bracket. 7. Clean the plate heat exchanger with a descaling product (citric acid pH 3). To do this, a specific cleaning appliance is available as an accessory. After cleaning, rinse thoroughly under running water. 8.3.4. Cleaning the domestic water cartridge The plate heat exchanger should be removed in order to clean the tap water cartridge. Then proceed as follows: 1. Dismantle the domestic water cartridge by rotating a screwdriver. 2. Remove the domestic water cartridge. 3. Clean or replace the domestic water cartridge if required. 4. Re-assemble all of the components. 8.3.5. Replacement of the expansion vessel The following procedures have to be carried out before the expansion vessel can be replaced: 4 Close the gas valve of the boiler. 4 Close the main water valve. 4 Close the flow central heating pipe and the return central heating pipe. 4 Drain the boiler. R000741-A 6 5 4 3 Gas/Gaz 2 1 R000401-A 3 2 a b 1 8. Checking and maintenance Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 60 02092014 - 7619497-02
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The expansion vessel is inside the boiler at the rear. To replace the expansion vessel, the front section of the boiler should be removed first. n Removing the front section of the boiler 1. Disconnect the flue gas discharge and air flow pipes from the boiler. 2. Remove the connection box. 3. Disconnect all incoming and outgoing pipes from the underside of the boiler. 4. Disconnect the gas supply pipe GAS / GAZ from the boiler. 5. Remove the condensate trap and drain hose. To check how to remove the condensate trap, see: ¼ "Checking the condensate trap", page 56. 6. Disconnect the expansion vessel hose from the underside of the boiler. 7. Press down the mounting clip on top of the boiler and remove the front of the boiler. n Remove the expansion vessel 1. Bring the tab above the expansion vessel forwards and hold onto it while disconnecting the expansion vessel. 2. Move the expansion vessel slightly upwards and lift the vessel from the mounting bracket. 3. Tip the expansion vessel forwards and allow it drop slightly. 4. Carefully lift the expansion vessel out of the boiler. 5. Replace the defective expansion vessel. 6. To re-assemble, perform the above actions in reverse order. CAUTION 4 Replace all removed gaskets. 4 Fill the system with clean tap water (advised water pressure is between 1 and 2 bar). ¼ "Water treatment", page 38 8.3.6. Re-assembling the boiler 1. Follow the procedure in reverse to re-assemble all of the components. 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. 2. Fill the condensate trap with water up to the mark. 3. Put the condensate trap back in place. T005059-A 1 2 R000351-A 4 3 2 1 Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 8. Checking and maintenance 02092014 - 7619497-02 61
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4. Carefully open the main water valve, fill the installation, vent it and, if need be, top it up with water. The hydraulic pressure must be a minimum of 0,8 bars. Check for any water leaks. 5. Check the seals on the gas and water connections. 6. Switch the boiler back on. 7. Check the setting of the gas/air ratio and, if necessary, correct it. ¼See chapter: "Checking combustion", page 45 ¼See chapter: "Setting the air/gas ratio", page 48 8. Checking and maintenance Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 62 02092014 - 7619497-02
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9 Troubleshooting 9.1 Error codes MainEco Combi 24 - 28 - 35 1 Domestic hot water temperature rotary knob 2 Heating water temperature rotary knob 3 Sweep key B and Status signals 4 RESET-button and on/off signal MainEco System 18 - 24 1 No function 2 Heating water temperature rotary knob 3 Sweep key B and Status signals 4 RESET-button and on/off signal The status signal for the B button can flash in a range of colours and at different frequencies. The meaning of these signals can be found in the User instruction card supplied with the boiler. ¼See also: "User instruction card", page 71. CAUTION The instruction card must be slid underneath the connection box after the boiler installation or use of the card. 9.2 Shutdowns and lock-outs 9.2.1. Blocking A (temporary) blocking mode is a boiler operating function caused by an unusual situation. The boiler control will try to re-start several times. The boiler will start up again after the blocking conditions have been eliminated. In the event of a shutdown, the status signal for the B button flashes green. The meaning of the shutdown codes can be found in the shutdown table. T002247-D 3 2 1 4 R000714-A 3 2 1 4 Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 9. Troubleshooting 02092014 - 7619497-02 63
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Status signals Description Code Shutdown code 1 (1 times green signal) Temperature protection 5v[1 / 5v[2 / 5v[7 Shutdown code 2 (2 times green signal) Shutdown input 5v[10 / 5v[11 Shutdown code 3 (3 times green signal) Flame loss 5v[22 Shutdown code 4 (4 times green signal) Communication fault 5v[12 / 5v[13 / 5v[21 Shutdown code 5 (5 times green signal) Parameter or identification fault 5v[0 / 5v[16 / 5v[17 / 5v[18 / 5v[19 Shutdown code 6 (6 times green signal) Miscellaneous 5v[15 / 5v[25 The boiler starts up again automatically when the reason for the blocking has been removed. The shutdown codes from the status signals are related to the shutdown codes that can be read by the Recom software or a suitable controller. The meaning of the shutdown codes can be found in the shutdown table: Shutdown code Description Probable causes Checking / solution 5v[0 Parameter error 4 Parameters faulty 4 Reset df and dV 4 Restore parameters with Recom 5v[1 Maximum flow temperature exceeded 4 Non-existent or insufficient circulation 4 Check the circulation (direction, pump, valves) 4 Reasons for the heat demand 5v[2 Maximum increase of the flow temperature has been exceeded 4 Non-existent or insufficient circulation 4 Sensor error 4 Check the circulation (direction, pump, valves) 4 Check the water pressure 4 Check that the sensors are operating correctly 4 Check that the sensor has been correctly fitted 4 Check the cleanliness of the heat exchanger 5v[7 Maximum difference between the flow and return temperature exceeded 4 Non-existent or insufficient circulation 4 Sensor error 4 Check the circulation (direction, pump, valves) 4 Check the water pressure 4 Check that the sensors are operating correctly 4 Check that the sensor has been correctly fitted 4 Check the cleanliness of the heat exchanger 5v[10 Shutdown input is open 4 External cause 4 Parameter error 4 Bad connection 4 Suppress the external cause 4 Check the parameters 4 Check the wiring 5v[11 Shutdown input active or frost protection active 4 External cause 4 Parameter error 4 Bad connection 4 Suppress the external cause 4 Check the parameters 4 Check the wiring 5v[12 Communication error with the HMI PCB 4 Connection box not connected 4 Check the wiring (1) These lock-outs are not stored in the fault memory 9. Troubleshooting Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 64 02092014 - 7619497-02
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Shutdown code Description Probable causes Checking / solution 5v[13 Communication error with the SCU PCB 4 Bad connection with BUS 4 SCU PCB missing from connection box 4 Check the wiring 4 Carry out automatic detection 5v[15 Gas pressure too low 4 Non-existent or insufficient circulation 4 Incorrect gas switch Gps adjustment (connected to PCB SCU) 4 Check that the gas valve is fully opened 4 Check the supply pressure 4 Check whether the Gps gas pressure control system has been correctly fitted 4 Replace the Gps gas pressure control system if need be 5v[16(1) Configuration error 4 Internal fault in gas/air unit 4 Replace the gas/air unit 5v[17(1) Configuration fault or default parameter table incorrect 4 Parameter fault in gas/air unit4 Replace the gas/air unit 5v[18(1) Configuration error (Boiler/ PSU not recognised) 4 Incorrect PSU for this boiler 4 Replace the PSU 5v[19(1) Configuration fault or parameters df-dV unknown 4 Reset df and dV 4 Reset df and dV 5v[20(1) Configuration procedure active 4 Active for a short time after switching on the boiler 4 No action required (Normal behaviour) 5v[21 Communication fault 4 Internal fault in gas/air unit 4 Replace the gas/air unit 5v[22 No flame during operation 4 No ionization current 4 Purge the gas supply to remove air 4 Check that the gas valve is fully opened 4 Check the supply pressure 4 Check the operation and setting of the gas valve unit 4 Check that the air inlet and flue gas discharge flues are not blocked 4 Check that there is no recirculation of flue gases 5v[25 Internal fault in gas/air unit 4 Replace the gas/air unit (1) These lock-outs are not stored in the fault memory 9.2.2. Lock out If the blocking conditions still exist after several start up attempts, the boiler will switch into locking mode (fault). The boiler can only start operating again once the causes of the lock-out have been rectified and after pressing the J key. In the event of a fault, the status signal for the B button flashes red. The meaning of the error codes is given in the error table: Status signals Description Code Error code 1 (1 times red signal) Sensor error e[02 / e[03 / e[04 / e[05 / e[06 / e[07 / e[08 / e[09 / e[10 / e[11 / e[35 Error code 2 (2 times red signal) Overheat temperature protection e[12 / e[41 Error code 3 (3 times red signal) Ignition fault e[14 / e[16 / e[36 Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 9. Troubleshooting 02092014 - 7619497-02 65
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Status signals Description Code Error code 4 (4 times red signal) Fan fault e[34 Error code 5 (5 times red signal) Parameter error e[00 / e[01 Error code 6 (6 times red signal) Miscellaneous The fault codes can be read with the Recom service software, a suitable controller or a service tool. Press the J key for 5 seconds: The status signals will flash red quickly and the boiler will start its reset procedure. The boiler will also start an automatic venting cycle lasting around 4 minutes. If the error code continues to display, search for the cause in the error table and apply the solution. The fault codes from the status signals are related to the fault codes that can be read by the Recom software or a suitable controller. The meaning of the error codes is given in the error table: Lock out (Status signals) Status signals Description Probable causes Checking / solution Error code 1 (1 times red signal) Sensor fault, temperature fault or flow fault 4 Sensor not or badly connected 4 Bad connection 4 Non-existent or insufficient circulation 4 Water circulation direction reversed 4 Sensor fault 4 Check the wiring 4 Check that the sensors are operating correctly 4 Check that the sensor has been correctly fitted 4 Vent the air in the heating system 4 Check the water pressure 4 Check the cleanliness of the heat exchanger 4 Check the circulation (direction, pump, valves) 4 Replace the sensor if necessary Error code 2 (2 times red signal) Maximum temperature of heat exchanger or control unit exceeded 4 Non-existent or insufficient circulation 4 Sensor not or badly connected 4 Bad connection 4 Sensor fault 4 No air supply or insufficient air supply 4 No flue gas flow or insufficient flue gas flow 4 Circulation 4 Vent the air in the heating system 4 Check the water pressure 4 Check the cleanliness of the heat exchanger 4 Check the circulation (direction, pump, valves) 4 Check the wiring 4 Check that the sensors are operating correctly 4 Check that the sensor has been correctly fitted 4 Replace the sensor if necessary 4 Check air supply 4 Check flue gas flow 4 Replace seals Error code 3 (3 times red signal) Ignition fault: 4 5 burner start- up failures 4 False flame signal 4 5x Flame loss 4 No ignition 4 Ignition arc, but no flame formation 4 Presence of the flame but insufficient ionization (<1 µA) 4 Check the wiring 4 Check breakdown to earth 4 Check the condition of the burner set 4 Check the earthing 4 Check that the gas valve is fully opened 4 Check the supply pressure 4 Purge the gas supply to remove air 4 Check the operation and setting of the gas valve unit 4 Check that the air inlet and flue gas discharge flues are not blocked 4 Replace the ionization/ignition electrode 9. Troubleshooting Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 66 02092014 - 7619497-02
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Lock out (Status signals) Status signals Description Probable causes Checking / solution Error code 4 (4 times red signal) Fan fault 4 External draught over the boiler 4 Defective gas/air unit 4 Check for adequate draw on the chimney connection 4 Replace the gas/air unit Error code 5 (5 times red signal) Parameter error 4 Bad connection 4 Safety parameters not found 4 Check the wiring 4 ResetdF/dU code with Recom software, controller or service tool Error code 6 (6 times red signal) Miscellaneous 4 Several possible causes 4 The fault codes can be read with the Recom service software, a suitable controller or a service tool Lock out (Error code - e[KK) Error code Description Probable causes Checking / solution e[00 Storage unit PSU parameter not found 4 Bad connection 4 Check the wiring e[01 The safety parameters are incorrect 4 Bad connection 4 PSU defective 4 Check the wiring 4 Replace PSU e[02 Flow temperature sensor short circuited 4 Sensor not or badly connected 4 Bad connection 4 Sensor fault 4 Check the wiring 4 Check that the sensors are operating correctly 4 Check that the sensor has been correctly fitted 4 Replace the sensor if necessary e[03 Flow temperature sensor open circuit 4 Sensor not or badly connected 4 Bad connection 4 Sensor fault 4 Check the wiring 4 Check that the sensors are operating correctly 4 Check that the sensor has been correctly fitted 4 Replace the sensor if necessary e[04 e[05 Flow temperature too low Flow temperature too high 4 No circulation 4 Bad connection 4 Sensor not or badly connected 4 Sensor fault 4 Vent the air in the heating system 4 Check the water pressure 4 Check the wiring 4 Check the circulation (direction, pump, valves) 4 Check the cleanliness of the heat exchanger 4 Check that the sensors are operating correctly 4 Check that the sensor has been correctly fitted 4 Replace the sensor if necessary e[06 Return temperature sensor short circuited 4 Sensor not or badly connected 4 Bad connection 4 Sensor fault 4 Check that the sensor has been correctly fitted 4 Check the wiring 4 Check that the sensors are operating correctly e[07 Return temperature sensor open circuit 4 Sensor not or badly connected 4 Bad connection 4 Sensor fault 4 Check that the sensor has been correctly fitted 4 Check the wiring 4 Check that the sensors are operating correctly e[08 e[09 Return temperature too low Return temperature too high 4 No circulation 4 Bad connection 4 Sensor not or badly connected 4 Sensor fault 4 Vent the air in the heating system 4 Check the water pressure 4 Check the wiring 4 Check the circulation (direction, pump, valves) 4 Check the cleanliness of the heat exchanger 4 Check that the sensors are operating correctly 4 Check that the sensor has been correctly fitted 4 Replace the sensor if necessary Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 9. Troubleshooting 02092014 - 7619497-02 67
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Lock out (Error code - e[KK) Error code Description Probable causes Checking / solution e[10 e[11 Difference between the flow and return temperatures too great 4 No circulation 4 Sensor not or badly connected 4 Sensor fault 4 Vent the air in the heating system 4 Check the water pressure 4 Check the wiring 4 Check the circulation (direction, pump, valves) 4 Check the cleanliness of the heat exchanger 4 Check that the sensors are operating correctly 4 Check that the sensor has been correctly fitted 4 Replace the sensor if necessary e[12 Temperature of heat exchanger above normal range (high-limit thermostat STB) 4 No circulation 4 Bad connection 4 Sensor not or badly connected 4 Sensor fault 4 Vent the air in the heating system 4 Check the water pressure 4 Check the wiring 4 Check the circulation (direction, pump, valves) 4 Check the cleanliness of the heat exchanger 4 Check that the sensors are operating correctly 4 Check that the sensor has been correctly fitted 4 Replace the sensor if necessary e[14 5 burner start-up failures 4 No ignition 4 Check cabling of ignition transformer 4 Replace the ionization/ignition electrode 4 Check breakdown to earth 4 Check the condition of the burner set 4 Check the earthing 4 Defective gas/air unit 4 Ignition arc, but no flame formation 4 Check that the gas valve is fully opened 4 Check the supply pressure 4 Purge the gas supply to remove air 4 Check the operation and setting of the gas valve unit 4 Check that the air inlet and flue gas discharge flues are not blocked 4 Check the wiring on the gas valve unit 4 Defective gas/air unit 4 Presence of the flame but insufficient ionization (<1 µA) 4 Check that the gas valve is fully opened 4 Check the supply pressure 4 Replace the ionization/ignition electrode 4 Check the earthing 4 Check the wiring on the ionization/ignition electrode e[16 False flame signal 4 Short-term fluctuations of the mains 4 Ionization current present even though there is no flame 4 The burner remains very hot: CO2 too high 4 Defective gas/air unit 4 Press the J key for 5 seconds 4 Replace the ionization/ignition electrode 4 Set the CO2 4 Check the gas/air unit and replace it if necessary e[17 Problem on the gas valve 4 Defective gas/air unit 4 Replace the gas/air unit e[34 Fan fault 4 External draught over the boiler 4 Defective gas/air unit 4 Check for adequate draw on the chimney connection 4 Check the gas/air unit and replace it if necessary 9. Troubleshooting Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 68 02092014 - 7619497-02
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Lock out (Error code - e[KK) Error code Description Probable causes Checking / solution e[35 Flow and return reversed 4 Bad connection 4 Sensor fault 4 Sensor not or badly connected 4 Water circulation direction reversed 4 Replace the sensor if necessary 4 Check the circulation (direction, pump, valves) 4 Check that the sensors are operating correctly 4 Check that the sensor has been correctly fitted e[36 5x Flame loss 4 No ionization current 4 Purge the gas supply to remove air 4 Check that the gas valve is fully opened 4 Check the supply pressure 4 Check the operation and setting of the gas valve unit 4 Check that the air inlet and flue gas discharge flues are not blocked 4 Check that there is no recirculation of flue gases e[37 Communication fault 4 Internal fault in gas/air unit 4 Replace the gas/air unit e[38 Communication error with the SCU PCB 4 Bad connection 4 Defective SCU PCB 4 Check the wiring 4 Replace SCU PCB e[39 Shutdown input in locked-out mode 4 External cause 4 Bad connection 4 Parameter incorrectly set 4 Suppress the external cause 4 Check the wiring 4 Check the parameters e[40 HRU/URC unit test error 4 HRU/URC unit test error 4 External cause 4 Bad connection 4 Parameter incorrectly set 4 Check the HRU/WTW unit 4 Suppress the external cause 4 Check the wiring 4 Check the parameters e[41 Maximum control unit temperature exceeded 4 No air supply or insufficient air supply 4 No flue gas flow or insufficient flue gas flow 4 Recirculation 4 Check air supply 4 Check flue gas flow 4 Replace seals Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 9. Troubleshooting 02092014 - 7619497-02 69
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10 Spare parts 10.1 General When it is observed subsequent to inspection or maintenance work that a component in the boiler needs to be replaced, use only original spare parts or recommended spare parts and equipment. To order a spare part, give the reference number shown on the list. 10.2 Spare parts Code no. Description __________________________________________________________________________ 7616301 Sensor Kit 7216300 Airvent inc Clip 7216299 Electrode Set Inc Screw & Gasket 7216613 Pressure Gauge 7216292 Combustion Control Unit 7618106 Control & Fan Assy 7618108 Gas Valve & Outlet Assy 7216603 Pump inc Seal - 24 - 28 kW Combi - 18 - 24 kW System 7216604 Pump inc Seal - 35 kW Combi 7216602 User Interaction Controller Combi 7622585 User Interaction Controller System 7601283 Hydraulic Group 24 Kw Combi 7601060 Hydraulic Group 28 kW Combi 7601214 Hydraulic Group 35 kW Combi 7216624 Hydraulic Group 12 - 24 kW System 10. Spare parts Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 70 02092014 - 7619497-02
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11 Appendix 11.1 User instruction card R000392-A Group Signal Meaning Boiler in service (Intermittent green signal) Central heating heat Hot tap water Maintenance message(1) (Flashing orange signal) Code A Code B Code C Blockage (Flashing green signal) Temperature protection Shutdown input Flame loss Communication fault Parameter error Miscellaneous Repair (Flashing red signal) Sensor error Overheat temperature protection Ignition fault Fan fault Parameter error Miscellaneous Reinitialisation Resetting... Chimney-sweeping position (Intermittent orange signal) Part load Full load Central heating heat Full load Hot tap water PC programming mode _________________________________ _________________________________ (1) This function is not applicable to every type Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 11. Appendix 02092014 - 7619497-02 71
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11.2 Gas boiler system commissioning checklist CONDENSING BOILERS ONLY The condensate drain has been installed in accordance with the manufacturer’s instructions and/or s e Y 8 9 7 6 S B / 6 4 5 5 S B COMBINATION BOILERS ONLY Is the installation in a hard water area (above 200ppm)? Yes No Yes No DOMESTIC HOT WATER MODE Measure and Record: Gas rate m³/hr OR ft³/hr Burner operating pressure (at maximum r a b m ) e t a r OR Gas inlet pressure at maximum r a b m e t a r Cold water inlet temperature °C Hot water has been checked at all outlets Yes Temperature °C I/min CENTRAL HEATING MODE measure and record: Gas rate m³/hr OR ft³/hr Burner operating pressure (if applicabl r a b m ) e OR Gas inlet r a b m e r u s s e r p °C Central heating return temperature °C ALL SYSTEMS ’s s e Y s n oitc u rts ni What system cleaner was used? What inhibitor was used? Quantity litres Yes No CONTROLS (tick the appropriate boxes) Time and temperature control to heating Room thermostat and b a m m a r g o r P r e m it/r e m m a r g o r p le room thermostat Load/weather m u m it p O n oit a s n e p m o c start control Time and temperature control to hot water Cylinder thermostat and n oit a nib m o C r e m it/r e m m a r g o r p Boiler Heating zone valves t o N d e tti F required Hot water zone valves t o N d e tti F required Thermostatic radiator val t o N d e tti F s e v required Automatic bypass to t o N d e tti F m e ts y s required Boiler interlock Provided Customer e T : e m a n lephone number: Address: Boiler make and model: Boiler serial number: Commissioned by (PRINT s a G :) E M A N Safe register number: Company e T : e m a n lephone number: Company address: Commissioning date: This Commissioning Checklist is to be completed in full by the competent person who commissioned the boiler as a means of demonstrating compliance with the appropriate Building Regulations and then handed to the customer to keep for future reference. Failure to install and commission according to the manufacturer’s instructions and complete this Benchmark Commissioning Checklist will invalidate the warranty. This does not affect the customer’s statutory rights. 11. Appendix Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 72 02092014 - 7619497-02
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www.centralheating.co.uk www.centralheating.co.uk *All installations in England and Wales must be to Local Authority Building Control (LABC) either directly or through a Competent Persons Scheme. A Building Regulations Compliance will then be issued to the customer. © Heating and Hotwater Industry Council (HHIC) Commissioning Engineer’s Signature Customer’s Signature ALL INSTALLATIONS Record the following: At max. rate: CO ppm AND CO/CO² Ratio At min. rate: (where possible) CO ppm AND CO/CO² Ratio The heating and hot water system complies with the appropriate Building Regul s e Y s n oit a The boiler and associated products have been installed and commissioned in accordance with the manufacturer’s s e Y s n oitc u rts ni The operation of the boiler and system controls have been demonstrated to and understood by the s e Y r e m o ts u c The manufacturer’s literature, including Benchmark Checklist and Service Record, has been explained and left with the s e Y r e m o ts u c 11.3 Service record SERVICE 01 Date: Engineer name: Company name: Telephone No: Gas safe register No: Record: At max. rate: CO ppm AND CO² % At min. rate: (Where Possible) CO ppm AND CO² % Comments: Signature SERVICE 02 Date: Engineer name: Company name: Telephone No: Gas safe register No: Record: At max. rate: CO ppm AND CO² % At min. rate: (Where Possible) CO ppm AND CO² % Comments: Signature SERVICE 03 Date: Engineer name: Company name: Telephone No: Gas safe register No: Record: At max. rate: CO ppm AND CO² % At min. rate: (Where Possible) CO ppm AND CO² % Comments: Signature SERVICE 04 Date: Engineer name: Company name: Telephone No: Gas safe register No: Record: At max. rate: CO ppm AND CO² % At min. rate: (Where Possible) CO ppm AND CO² % Comments: Signature SERVICE 05 Date: Engineer name: Company name: Telephone No: Gas safe register No: Record: At max. rate: CO ppm AND CO² % At min. rate: (Where Possible) CO ppm AND CO² % Comments: Signature SERVICE 06 Date: Engineer name: Company name: Telephone No: Gas safe register No: Record: At max. rate: CO ppm AND CO² % At min. rate: (Where Possible) CO ppm AND CO² % Comments: Signature It is recommended that your heating system is serviced regularly and that the appropriate Service Interval Record is completed. Service Provider Before completing the appropriate Service Record below, please ensure you have carried out the service as described in the manufacturer’s instructions. Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 11. Appendix 02092014 - 7619497-02 73
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www.centralheating.co.uk *All installations in England and Wales must be to Local Authority Building Control (LABC) either directly or through a Competent Persons Scheme. A Building Regulations Compliance will then be issued to the customer. © Heating and Hotwater Industry Council (HHIC) SERVICE 07 Date: Engineer name: Company name: Telephone No: Gas safe register No: Record: At max. rate: CO ppm AND CO² % At min. rate: (Where Possible) CO ppm AND CO² % Comments: Signature SERVICE 08 Date: Engineer name: Company name: Telephone No: Gas safe register No: Record: At max. rate: CO ppm AND CO² % At min. rate: (Where Possible) CO ppm AND CO² % Comments: Signature SERVICE 09 Date: Engineer name: Company name: Telephone No: Gas safe register No: Record: At max. rate: CO ppm AND CO² % At min. rate: (Where Possible) CO ppm AND CO² % Comments: Signature SERVICE 10 Date: Engineer name: Company name: Telephone No: Gas safe register No: Record: At max. rate: CO ppm AND CO² % At min. rate: (Where Possible) CO ppm AND CO² % Comments: Signature 11. Appendix Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 74 02092014 - 7619497-02
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Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 11. Appendix 02092014 - 7619497-02 75
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11. Appendix Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 76 02092014 - 7619497-02
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© Copyright All technical and technological information contained in these technical instructions, as well as any drawings and technical de scriptions supplied, remain our property and shall not be multiplied without our prior consent in writing. Subject to alterations.
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Open Monday - Friday, 8am - 6pm Weekends & Bank Holidays, 8.30am - 2pm We are closed on Christmas Day and New Year’s Day. Please note calls may be monitored or recorded. Baxi, Brooks House Coventry Road, Warwick, CV34 4LL. Please ensure the boiler is installed in accordance with these installation instructions and regulations adhered too. 0844 871 1525 Please note calls may be monitored or recorded For Baxi Customer Support and Technical Advice, contact us at www.baxi.co.uk 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. 7619497 - v.02 - 02092014 7619497
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