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United Kingdom
en
Installation and Service Manual
High Efficiency Wall Hung Condensing Gas Boiler
Main Eco Compact Combi
25 — 30
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.
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Table of Contents
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Summary of Contents for Main Eco Compact Combi 25
- Page 1 United Kingdom Installation and Service Manual High Efficiency Wall Hung Condensing Gas Boiler Main Eco Compact Combi 25 — 30 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.
- Page 2 Dear Customer, Thank you very much for buying this appliance. Please read through the manual carefully before using the product, and keep it in a safe place for later reference. In order to ensure continued safe and efficient operation we recommend that the product is serviced regularly. Our service and customer service organisation can assist with this.
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Page 3: Table Of Contents
Main components ........ - Page 4 Contents Choice of the location ................28 5.3.1 Location of the boiler .
- Page 5 Contents 9.2.5 Checking the burner and cleaning the heat exchanger ......... 56 Specific maintenance instructions .
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Page 6: Safety
1 Safety Safety Benchmark 1.1.1 Building Regulations and the Benchmark Commissioning Checklist Building Regulations (England & Wales) require notification of the installa tion of a heating appliance to the relevant Local Authority Building Control Department. This can be achieved via a Competent Persons Self Certifica tion Scheme as an option to notifying the Local Authority directly. -
Page 7: Installer Notification Guidelines
1 Safety 1.1.3 Installer Notification Guidelines Fig.2 Installer Notification Guidelines Choose Building Regulations Notification Route Competent Person's Building Control Self Certification Scheme Contact your relevant Local Install and Commission this Authority Building Control appliance to manufacturer's (LABC) who will arrange instructions an inspection or contact a government approved... -
Page 8: General Safety Instructions
If the mains lead is damaged, it must be replaced by the original manufacturer, the manufacturer's dealer or another suitably skilled person to prevent hazardous situations from arising. Warning Always disconnect the mains supply and close the main gas tap when working on the boiler. -
Page 9: Specific Safety Instructions
The boiler must be installed in a frost-free area. In the case of a fixed connection to the power cord, you must al ways install a main double pole switch with an opening gap of at least 3 mm (EN 60335-1). -
Page 10: Liabilities
1 Safety Always grip the boiler firmly, and before lifting feel where the weight is concentrated to establish the centre of gravity, repositioning yourself as necessary. See the "Installation" section of these instructions for recom mended lift points. Remember The circumstances of each installation are different. Always assess the risks associated with handling and lifting according to the individual con... -
Page 11: About This Manual
2 About this manual About this manual General This manual is intended for the installer of a Main Eco Compact Combi boiler. Additional documentation These Installation & Service Instructions must be read in conjunction with the Flue Accessories Fitting Guide supplied in the Literature Pack. -
Page 12: Technical Specifications
3 Technical specifications Technical specifications Homologations 3.1.1 Safety, Performance & Quality This boiler has been assessed by an appropriate Notified Body and shown to meet the requirements of all Directives and Regulations as applicable. These Directives and Regulations lay down requirements for the safety and efficiency of the appliance, together with its design, construction and use of materials. -
Page 13: Technical Data
Important All data in these sections are nominal and subject to normal pro duction tolerances. Tab.5 General Main Eco Compact Combi Gas council numbers 47 467 14 47 467 15 Nominal heat input domestic hot water — Net (Qn Hi) 25.8... - Page 14 3 Technical specifications Main Eco Compact Combi Nominal heat input central heating — Maxi Net (Qn Hi) 20.6 20.6 mum rate Gross (Qn Hs) 22.9 22.9 Nominal heat input — Minimum rate Net (Qn Hi) Gross (Qn Hs) Nominal heat output 80/60°C — domestic hot water —...
- Page 15 Dynamic (nominal) inlet pressure (Natural gas — G20) 20mbar with a CV of 37.78 MJ/m Tab.9 Electrical specifications Main Eco Compact Combi Nominal electrical power supply voltage Nominal electrical power supply frequency Nominal power consumption when firing External fuse rating...
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Page 16: Technical Parameters
3 Technical specifications Main Eco Compact Combi Installed weight when filled with water 32.5 32.5 3.2.2 Technical parameters Tab.14 Technical parameters for boiler combination heaters Main Eco Compact Combi Condensing boiler Low-temperature boiler B1 boiler Cogeneration space heater Combination heater... -
Page 17: Dimensions And Connections/Clearances
3 Technical specifications The back cover for contact details. Dimensions and connections/clearances Fig.3 Dimensions and connections / clearances PN-0000338 Condensate trap sump Condensate drain Heating circuit water flow Hot water outlet Gas inlet Pressure relief pipe Cold water inlet Heating circuit water return Pump drain point Boiler drain point on flow isolation tap Cable entry points... -
Page 18: Electrical Diagram
3 Technical specifications Electrical diagram Fig.4 Electrical wiring diagram br bk PN-0000341 bk — black br — brown b — blue g — green r — red w — while g/y — green/ yellow Description Description Gas valve Spark ignition electrode Hall effect sensor Diverter valve motor Flue sensor... -
Page 19: Description Of The Product
4 Description of the product Description of the product General description The Main Eco Compact Combi range are fully automatic gas fired wall mounted condensing boilers. They are room sealed and fan assisted and will serve central heating and mains fed domestic hot water. -
Page 20: Central Heating And Domestic Hot Water Production
With a demand for heating the pump circulates water through the primary circuit. Once the main burner ignites the fan speed controls the gas rate to main tain the heating temperature measured by the temperature sensor. When the flow temperature exceeds the set temperature, a 3 minute delay occurs before the burner relights automatically (anti-cycling). -
Page 21: Frost Protection Mode
4 Description of the product The burner will light automatically and the temperature of domestic hot wa ter is controlled by the temperature sensor. When the domestic hot water demand ceases the burner will extinguish and the diverter valve will remain in the domestic hot water mode, unless there is a demand for central heating. -
Page 22: Main Components
4 Description of the product Main components 4.3.1 List of components Fig.7 Component descriptions PN-0000262 Fig.8 Hydraulic layout PN-0000388 Tab.16 Component descriptions Description Description Description Expansion vessel Flue sensor Flue adaptor Expansion vessel valve Spark ignition electrode Heating flow sensor... -
Page 23: Control Panel Description
4 Description of the product Control panel description 4.4.1 Description of the control panel Fig.9 Control panel Display Reset button Central heating temperature control Service diagnostic port DHW temperature control System water pressure gauge Reset PN-0000334 Fig.10 Display screen Display description The following symbols may be seen on the display OFF (frost protection still enabled) Indicates errors that prevent the burner from starting... -
Page 24: Accessories And Options
720971401 Multifit wall mounted 24 hour timeclock 7715535 Main Eco Compact boiler stand off 720030701 Main RF digital 7 day programmable room thermostat 7683084 Baxi IFOS In Flue outdoor sensor Baxi uSense wired smart thermostat 7649277 Baxi single channel wired programmer 7212444 For flue accessories (elbows, extensions, clamps etc.) refer to the Flue Ac... -
Page 25: Before Installation
5 Before installation Before installation Installation regulations Warning Installation, repair and maintenance must only be carried out by a competent person. This document is intended for use by compe tent persons. Installation must be carried out in accordance with the prevailing regula tions, the code of practice and the recommendations in these instructions. -
Page 26: Hard Water Area
5 Before installation Important Any wiring to the boiler, from either the mains or an external control, MUST be cable of the following specification:- 0.75mm 3183/4/5Y (depending on installation) multi strand flexible cable conforming to BS 50525-2-11. Cable of the above specification is sufficiently flexible to with stand normal regular opening and closing of the facia/control box as expected during routine servicing and other maintenance work. -
Page 27: Showers
5 Before installation Important Failure to flush and add inhibitor to the system will invalidate the appliance warranty. It is important to check the inhibitor concentration after installation, system modification and at every service in accordance with the inhibitor manufac turer. -
Page 28: Choice Of The Location
5 Before installation A boiler discharge pump is available which will dispose of both condensate & high temperature water from the relief valve. It has a maximum head of 5 metres. Choice of the location 5.3.1 Location of the boiler The boiler may be fitted to any suitable wall with the flue passing through an outside wall or roof and discharging to atmosphere in a position permit... -
Page 29: Bath And Shower Rooms
5 Before installation 5.3.2 Bath and shower rooms Fig.12 Bathroom 1 and 2 Zone 0 Zone 1 Zone 2 Window recess Zone 2 Ceiling Outside zones Important The boiler has a protection rating of IPX5D and if installed in a room containing a bath or shower can be within Zone 2 (but not 0 or 1). -
Page 30: Condensate Drain
5 Before installation 5.3.4 Condensate drain Fig.13 Pipework and method of termination It is strongly recommended to discharge internally into the household drainage system. If connecting to a rain water drain, that drain MUST dis charge into a foul drain. 32mm 21.5mm Pipework. - Page 31 5 Before installation Fig.14 Methods of termination continued Important Failure to install the condensate discharge pipework correctly will affect the reliable operation of the boiler. Careful consideration must be given to the possibility of the pipe work being subject to freezing conditions and appropriate meas ures taken to prevent blockage.
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Page 32: Clearances
5 Before installation 5.3.5 Clearances Fig.15 Clearances A flat vertical area is required for the installation of the boiler and it should be capable of bearing the weight of the boiler when full of water. These dimensions include the necessary clearances around the boiler for case removal, spanner access and air movement. - Page 33 5 Before installation Description Description Horizontally to an opening, air brick, From an opening in carport (e.g. door, 1200 opening window etc. window) into the dwelling Below gutters, soil pipes or drain pipes 25 (75) Vertically from a terminal on the same 1500 wall Below eaves...
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Page 34: Horizontal Flue/Chimney Systems
5 Before installation Fig.18 Plume displacement kit Opening window or door Air inlet Plume displacement kit 150mm minimum Important If fitting a Plume Displacement Flue Kit, the air inlet must be a minimum of 150mm from any opening windows or doors. Important The Plume Displacement flue gas discharge terminal and air inlet must always terminate in the same pressure zone i.e. -
Page 35: Flue/Chimney Trim
5 Before installation Warning SUPPORT - All flue systems MUST be securely supported at a MINIMUM of once every metre & every change of direction. It is recommended that every straight piece is supported irrespective of length. Additional supports are available as accessories. VOIDS - Consideration must be given to flue systems in voids and the provision of adequate access for subsequent periodic visual inspection. -
Page 36: Unpacking & Initial Preparation
5 Before installation essary. Carrying and lifting equipment should be used as required. e.g. when installing in a loft. Unpacking & initial preparation 5.5.1 Unpacking Fig.23 Unpacking the boiler Caution RISK ASSESSMENT - Before commencing the installation it is recommended that the "Five Steps to Risk Assessment" docu ment published by the HSE is consulted, and an assessment per... -
Page 37: Connecting Diagrams
5 Before installation Connecting diagrams 5.6.1 Filling information Fig.25 System filling circuit Domestic hot water mains inlet Central heating return Stop valve Double check valve (Not supplied) Loop (Temporary or Permanent) A filling point connection on the central heating return pipework must be provided to facilitate initial filling and pressurising and also any subsequent water loss replacement/refilling. - Page 38 Even in circumstances where a non-return device is not fitted any future modifications to the mains inlet (e.g. fitting of a water meter) should be considered and an expansion vessel fitted. Main cannot accept any responsibility for damage to the boiler if these recommendations are not followed.
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Page 39: Installation
6 Installation Installation General Fig.27 Mounting the boiler Installation must be carried out in accordance with the prevailing regula tions, codes of practice and the recommendations in this manual. Danger If the boiler is installed in a compartment do not use it for storage purposes. -
Page 40: Connecting The Condensate Drain
6 Installation 6. The pipework must be clipped at suitable intervals to support it, com mencing as close to the boiler as possible. 6.2.2 Connecting the condensate drain Fig.30 Pour 300ml of water into flue spigot 1. Remove the blanking cap, and using the straight rubber coupling supplied, connect the condensate drain pipework to the boiler con... - Page 41 6 Installation Fig.33 Flue dimension Y 5. To dimension " X" add 40mm. This dimension to be known as "Y" . TOP label Sealing tape Securing screw Peak to be uppermost 6. Adjust the two telescopic sections to dimension "Y" and seal the joint with the tape provided.
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Page 42: Electrical Connections
6 Installation Electrical connections Electrical supply, page 25 for details of the electrical supply. Warning Check that the total nominal consumption of the accessories con nected to the appliance is less than 1 amp. If it is higher, a relay must be installed between the accessories and the electronic board. - Page 43 6 Installation Fig.36 Typical electrical connections 230V 230V 230V PN-0000396 5. Connect the earth, permanent live and neutral wires to the terminal block. Note Both the permanent live and neutral connections are fused. Description Description Fused Spur Blue Room Thermostat Black External Clock Brown...
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Page 44: Connecting Outdoor Sensor
6 Installation These should be performed using a suitable meter, and include checks for Earth Continuity, Resistance to Eart, Short Circuit and Polarity. 6.4.2 Connecting on wall outdoor sensor Fig.37 Sensor position The sensor must be fixed to an external wall surface of the property it is serving. -
Page 45: Identifying Label
6 Installation 6.4.3 Identifying label Important The identifying label (7221476-01) supplied with the outdoor sen sor must be signed and affixed on or adjacent to the boiler. The label must be readily accessible without removing the boiler cas ing or any other disassembly. This label is required to enable SAP and energy assessors to identify that a weather compensation de... -
Page 46: Filling The Installation
6 Installation Fig.40 Example — setting to curve 50 Curve 50 PN-0000629 Filling the installation 6.5.1 Flushing the system Flush thoroughly and treat the system according to guidance given in BS 7593. 6.5.2 Fill the installation A filling point connection on the central heating return pipework must be provided to facilitate initial filling and pressurising and also any subsequent water loss replacement/refilling. -
Page 47: Commissioning
7 Commissioning Commissioning General Reference should be made to BS:EN 12828, 12831 & 14336 when com missioning the boiler. Ensure that the condensate drain trap has been primed. At the time of commissioning, complete all relevant sections of the Bench mark Checklist at the rear of this publication. -
Page 48: Commissioning Procedure
7 Commissioning Commissioning procedure 7.3.1 De-Aeration function Fig.41 Setting de-aeration Before turning on the power to the boiler, rotate the CH control knob ( fully anticlockwise. The purpose of the function is to remove as much air as possible from the heating system. -
Page 49: Checking Combustion - Chimney Sweep Mode
7 Commissioning Fig.43 Gas inlet test point 1. With the boiler operating in the maximum rate condition check that the operational (working) gas pressure at the inlet gas pressure test point is in accordance with BS 6798 & BS 6891. This must be AT LEAST 18mb ! 2. - Page 50 7 Commissioning Warning Ensure that both flue test point plugs are in place after checking combustion. Fig.45 Setting chimney sweep mode Setting maximum and minimum output 1. Turn both control knobs fully anticlockwise and leave for 10 sec onds. 2. Turn the DHW knob ( turn twice in quick succession (within 2 seconds).
- Page 51 7 Commissioning Fig.46 Combustion procedure Set Boiler to Maximum Rate Allow the combustion to stabilise. Do not insert probe to avoid ‘flooding’ the analyser. Perform Flue Integrity Combustion Check Insert the analyser probe into Verify Flue Integrity the air inlet test point, allowing Indication that products of Check CO &...
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Page 52: Configuring The System
7 Commissioning Configuring the system 7.5.1 System draining If at any time after installation it is necessary to drain and refill the central heating system (e.g. when replacing a radiator) the De-Aeration function must be activated to avoid air being trapped in the system. De-Aeration function, page 48. -
Page 53: Operation
8 Operation Operation Use of the control panel 8.1.1 Control panel The controls are operated by the control knobs and a reset button. Fig.48 Control panel Display screen Reset button CH temperature control knob Service diagnostic port DHW temperature control knob System water pressure gauge Important Reset... -
Page 54: Maintenance
9 Maintenance Maintenance General Warning When changing components ensure that both the gas and electri cal supplies to the boiler are isolated before any work is started. When the component has been changed recommission the boiler. Always examine any seals or gaskets, replacing where necessary. The case front panel MUST seal effectively against the boiler side panels. -
Page 55: Standard Inspection And Maintenance Operations
9 Maintenance Fig.49 Flue adaptor test points Remove the plug from the combustion test point, insert the analyser probe and obtain the CO/CO ratio. This must be less than 0.004. If the combus tion reading (CO/CO ratio) is greater than this, and the integrity of the complete flue system and combustion circuit seals has been verified, and the inlet gas pressure and gas rate are satisfactory either:- Perform the "Standard Inspection and Maintenance"... -
Page 56: Checking The Water Pressure
9 Maintenance 11. Carefully examine all seals and gaskets, replacing if necessary. Look for any evidence of leaks or corrosion and if found determine and rectify the cause. 12. Reassemble in reverse order. 13. Complete the relevant Service Interval Record section of the Bench mark Commissioning Checklist at the rear of this publication and then hand it back to the user. -
Page 57: Specific Maintenance Instructions
9 Maintenance Specific maintenance instructions Fig.53 Panel removal Warning When changing components ensure that both the gas and electri cal supplies to the boiler are isolated before any work is started. When the component has been changed recommission the boiler. Always examine any seals or gaskets, replacing where necessary. -
Page 58: Flow And Return Sensors
9 Maintenance 9.3.3 Flow and return sensors Fig.56 Remove flow and return sensors There is one sensor on the flow (red wires) and one sensor on the return (blue wires). 1. After noting the position of each sensors, prise the sensor clip off the pipe and disconnect the plug. -
Page 59: Hall Effect Sensor
9 Maintenance 9.3.7 Hall effect sensor Fig.59 Remove hall effect sensor 1. Ease the sensor upwards off the hydraulic inlet manifold assembly. 2. Disconnect the electrical plug from the sensor. 3. Connect the plug to the new sensor. Carefully fit the new sensor to the hydraulic assembly, ensuring it is fully down. -
Page 60: Diverter Valve Motor
1 bar. 9.3.12 Gas valve Tab.23 Characteristics of combustion Main Eco Compact Combi % (maximum) 9.0 + 0.3 – 0.2 9.0 + 0.3 – 0.2 % (minimum) 8.5 + 0.1 – 0.4 8.5 + 0.1 – 0.4 Diameter of coaxial discharge pipes 60/100 &... - Page 61 9 Maintenance Fig.64 Removing the gas valve Important After replacing the gas valve the CO must be checked and adjus ted. Only change the valve if a suitable calibrated combustion an alyer is available, operated by a competent person. 1. Undo the screw and disconnect the electrical plug. 2.
- Page 62 Throttle Adjustment Screw Offset Adjustment Screw 5. Remove the plug from the flue sampling test point. Insert the analyser probe and allow sufficient time for the reading to settle. Main Eco 25 - 30 Compact % (maximum) 9.0 + 0.3 – 0.2 6.
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Page 63: Pump - Head Only
9 Maintenance Warning Ensure that both flue test point plugs are in place after checking combustion. 9.3.13 Pump - head only Fig.66 Remove pump head only To remove the pump head only. 1. Drain the boiler primary circuit and disconnect the electrical plug from the pump 2. -
Page 64: 10 Troubleshooting
10 Troubleshooting 10 Troubleshooting 10.1 Error codes 10.1.1 Initial error fault finding checks Check that gas, water and electrical supplies are available at the boiler. Electrical supply = 230V ~ 50 Hz. The minimum gas pressure at the meter is 19mb. Carry out electrical system checks, i.e. -
Page 65: Fault Finding
10 Troubleshooting 10.2 Fault finding 10.2.1 Central heating Fig.69 Central heating — Follow operational sequence Turn on mains power 09, 15, 110 or 384 is flashing or re-occurs Go to section ‘A’ The display illuminates regularly, check all PCB connections. If this has no effect replace the PCB. -
Page 66: Domestic Hot Water
10 Troubleshooting 10.2.2 Domestic hot water Fig.70 Domestic hot water — Follow operational sequence 09, 15, 110 or 384 is flashing or re-occurs Turn on mains power Go to section ‘A’ regularly, check all PCB connections. If this The display illuminates has no effect replace the PCB. -
Page 67: Fault Finding Solutions Sections A To E
10 Troubleshooting 10.2.3 Fault finding solutions sections A to E Fig.71 Solutions sections A to E Is there 230V at: Main terminals L and N Check electrical supply Connection OK at X41 Main terminal fuse Replace fuse Check wiring PCB - X10 connector... -
Page 68: Fault Finding Solutions Sections F To H
10 Troubleshooting 10.2.4 Fault finding solutions sections F to H Fig.72 Solutions sections F to H Check and correct if necessary 1. Ignition electrode and lead Check wiring - see Electrical Replace PCB 2. Electrode connection Wiring Diagram page 18 3. -
Page 69: Fault Finding Solutions Sections I To M
10 Troubleshooting 10.2.5 Fault finding solutions sections I to M Fig.73 Solutions sections I to M CH system pressure less than Restore system pressure 0.5 bar Check wiring and PCB - X22 Replace hydraulic pressure switch connector for approx. 5V DC between green &... -
Page 70: 11 Decommissioning
11 Decommissioning 11 Decommissioning 11.1 Decommissioning procedure Disconnect the gas & electric supplies and isolate them. Drain the primary circuit and disconnect the filling device. Dismantle the chimney system and remove the boiler from the wall mount ing frame. -
Page 71: 12 Disposal
12 Disposal 12 Disposal 12.1 Disposal and recycling Caution Removal and disposal of the boiler must be carried out by a quali fied person in accordance with local and national regulations. -
Page 72: 13 Spare Parts
13 Spare parts 13 Spare parts 13.1 Short parts list The following spares are available: Fig.74 Spare parts Tab.24 Part number and description of spare parts Key No. Description Manufacturer’s Spare Part No. Safety thermostat 7207653 Detection / spark ignition electrode 7686344 Flow sensor and return sensor 7207471... -
Page 73: 14 Appendix
14 Appendix 14 Appendix 14.1 Benchmark commissioning checklist Warning After servicing or performing any maintenance on the boiler ensure that 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. -
Page 74: Service Records
14 Appendix ALL INSTALLATIONS At max. rate: ppm AND CO/CO ² Ratio Record the following: At min. rate: (where possible) ppm AND CO/CO ² Ratio The heating and hot water system complies with the appropriate Building Regul The boiler and associated products have been installed and commissioned in accordance with the manufacturer’s The operation of the boiler and system controls have been demonstrated to and understood by the The manufacturer’s literature, including Benchmark Checklist and Service Record, has been explained and left with the Commissioning Engineer’s Signature... - Page 75 14 Appendix SERVICE 07 SERVICE 08 Date: Date: Engineer name: Engineer name: Company name: Company name: Telephone No: Telephone No: Gas safe register No: Gas safe register No: At max. rate: ppm AND CO ² % At max. rate: ppm AND CO ²...
- Page 77 14 Appendix...
- Page 78 14 Appendix...
- Page 79 © 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.
- Page 80 Baxi Customer Support 0344 871 1545 Opening hours Monday - Friday, 8.00am-6.00pm Weekends and Bank Holidays, 8.30am-2.00pm Please note calls may be recorded for training and monitoring purposes baxi.co.uk Register now to activate your warranty: www.baxi.co.uk/registration For the warranty to be maintained, please make sure... Benchmark checklist is completed Warranty is registered within 30 days The boiler has an annual service...
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