Baxi MainEco Combi 24 Installation And Service Manual
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Baxi MainEco Combi 24 Installation And Service Manual

Wall mounted gas condensing boiler
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United Kingdom
en
Installation and Service Manual
Wall Mounted Gas Condensing Boiler
Baxi MainEco Combi and System
24-28-35 / 18-24
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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  • Page 1 United Kingdom Installation and Service Manual Wall Mounted Gas Condensing Boiler Baxi MainEco Combi and System 24-28-35 / 18-24 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 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.

  • Page 3: Table Of Contents

    Contents Building Regulations and the Benchmark Commissioning Checklist ........6 The Benchmark Scheme ........6 Installer Notification Guidelines ......7 Introduction ....................8 Symbols used ............8 Abbreviations ............8 General ..............8 2.3.1 Manufacturer’s liability ..........8 2.3.2 Installer’s liability .............9 2.3.3 User’s liability ............9 Homologations ............10 2.4.1 Certifications ............10 2.4.2...
  • Page 4 Contents Circulating pump (Available pump head) ..16 Technical specifications ........17 Installation ....................19 Regulations governing installation ....19 Choice of the location ........20 5.2.1 Type plate .............20 5.2.2 Location of the boiler ..........20 Main dimensions ..........22 Positioning the boiler .........23 Hydraulic connections ........23 5.5.1 Flushing the system ..........24 5.5.2...
  • Page 5 Commissioning ..................42 Control panel ............42 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 Commissioning the boiler ........43 Gas settings ............45 6.4.1 Gas circuit .............45 6.4.2 Checking combustion ..........45 6.4.3 Setting the air/gas ratio .........48 Finalizing work ............49...
  • Page 6 Contents Troubleshooting ..................63 Error codes ............63 Shutdowns and lock-outs ........63 9.2.1 Blocking ..............63 9.2.2 Lock out ..............65 Spare parts ....................70 10.1 General ..............70 10.2 Spare parts ............70 Appendix ....................71 11.1 User instruction card ..........71 11.2 Gas boiler system commissioning checklist ..............72 11.3 Service record .............73 02092014 - 7619497-02...

  • Page 7: Ec Declaration Of Conformity

    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. 02092014 - 7619497-02...

  • Page 8: Building Regulations And The Benchmark Commissioning Checklist

    Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 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.

  • Page 9: Installer Notification Guidelines

    Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 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...

  • Page 10: Introduction

    2. Introduction Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 Introduction 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...

  • Page 11: Installer's Liability

    Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 2. Introduction 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.

  • Page 12: Homologations

    2. Introduction Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 Homologations 2.4.1. Certifications CE identification no PIN 0063CM3019 NOx classification 5 (Standards EN) Type of connection (Flue gas outlet) C Gas Council number MainEco Combi 24: 47–075–93 MainEco Combi 28: 47–075–94...

  • Page 13: Safety Instructions And Recommendations

    Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 3. Safety instructions and recommendations Safety instructions and recommendations Safety instructions DANGER If you smell gas: Do not use a naked flame, do not smoke, do not operate electrical contacts or switches ( doorbell, light, motor, lift, etc..).
  • Page 14 3. Safety instructions and recommendations Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 Casing components Only remove the casing for maintenance and repair operations. Put the casing back in place after maintenance and repair operations.

  • Page 15: Technical Description

    Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 4. Technical description Technical description 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.

  • Page 16: Skeleton Diagrams

    4. Technical description Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 Skeleton Diagrams Combi 24 - 28 - 35 Primary heat exchanger Hydroblock Plate heat exchanger (DHW) Safety valve Heating flow Domestic hot water outlet (DHW)

  • Page 17: Combustion

    Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 4. Technical description 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...

  • Page 18: Regulation Of The Water Temperature

    4. Technical description Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 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.

  • Page 19: Technical Specifications

    Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 4. Technical description System 18 Manometric height central heating circuit 18 kW Water flow ( ΔT=20K) 1000 1200 1400 1600 Q (l/h) R000685-A System 24 Manometric height central heating circuit 20 kW Water flow ( ΔT=20K)
  • Page 20 4. Technical description Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 Boiler type MainEco Combi 24 Combi 28 Combi 35 System 18 System 24 Flue gas temperature min - max °C 32 - 78...

  • Page 21: Installation

    Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 5. Installation Installation 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.

  • Page 22: Choice Of The Location

    5. Installation Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 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.
  • Page 23 Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 5. Installation 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.

  • Page 24: Main Dimensions

    5. Installation Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 Main dimensions = 117 = 184 = 251 = 316 R000699-B Boiler Connection kit Connection of the combustion gas exhaust pipe; Ø 60 mm Connection of the air intake pipe;...

  • Page 25: Positioning The Boiler

    Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 5. Installation 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...

  • Page 26: Flushing The System

    5. Installation Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 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).

  • Page 27: Connection Of The Water Circuit For Domestic Use

    Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 5. Installation CAUTION The heating pipe must be mounted in accordance with prevailing provisions. Carry out any soldering work required at a safe distance from the boiler or before the boiler is fitted.

  • Page 28: Connecting The Safety Valve Discharge Pipe

    5. Installation Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 5.5.6. Connecting the safety valve discharge pipe 1. Connect the safety valve pipe to the safety valve outlet ê . CAUTION Any soldering must be completed before fitting the pipework to prevent damage from heat.
  • Page 29 Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 5. Installation Termination to an internal soil and vent pipe Set the discharge pipe at a gradient of at least 50 mm per metre, maximum horizontal length 5 metres.

  • Page 30: Automatic Air Bleed

    5. Installation Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 Pumped into an internal discharge branch (e.g. sink waste) ≥ 2.5° downstream of the trap Basement or similar (heated). Set the discharge pipe at a gradient of at least 50 mm per metre, maximum horizontal length 5 metres.

  • Page 31: Gas Connection

    Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 5. Installation Gas connection 1. Connect the gas inlet pipe GAS / GAZ. The pipe must have a diameter of at least 22 mm. WARNING Close the main gas valve before starting work on the gas pipes.

  • Page 32: Outlets

    5. Installation Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 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.

  • Page 33: Room Sealed Flue

    Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 5. Installation 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.

  • Page 34: Additional Directives

    5. Installation Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 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.

  • Page 35: Recommendations

    Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 5. Installation 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.

  • Page 36: Access To The Connector Block / Boiler Hmi

    5. Installation Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 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.

  • Page 37: Connecting The Outside Temperature Sensor

    Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 5. Installation Please read in conjunction with separate sheet "Connecting External Controls". n Connecting modulating controller The boiler is fitted with a OpenTherm connection as standard.

  • Page 38: Connect Frost Protection

    5. Installation Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 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.
  • Page 39 Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 5. Installation 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.

  • Page 40: Electrical Diagram

    5. Installation Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 Electrical diagram RS232 MAINS PUMP PUMP SENSORS 1 2 3 1 2 3 1 2 3 4 2 3 5 9 10 11 12 13...

  • Page 41: Filling The Condensate Trap

    Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 5. Installation Total installed heat output (kW) ≤ 70 70 - 200 200 - 550 > 550 Degree of acidity (water 7 - 9 7 - 9...

  • Page 42: Filling The System

    5. Installation Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 5.10.3. Filling the system CAUTION Before filling, open the valves on every radiator in the installation. Ensure that the boiler is switched off. T000181-B 1.

  • Page 43: Venting The System

    Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 5. Installation 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.

  • Page 44: Commissioning

    6. Commissioning Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 Commissioning Control panel MainEco Combi 24 - 28 - 35 Domestic hot water temperature rotary knob Heating water temperature rotary knob Sweep key B and Status signals...

  • Page 45: Check Points Before Commissioning

    Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 6. Commissioning 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.
  • Page 46 6. Commissioning Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 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.

  • Page 47: Gas Settings

    Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 6. Commissioning 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.
  • Page 48 6. Commissioning Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 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;...
  • Page 49 Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 6. Commissioning Set Boiler to Maximum Rate Allow the combustion to stabilise. Do not insert probe to avoid ‘flooding’ the analyser. Perform Flue Integrity Combustion Check Insert the analyser probe into the air inlet test point, allowing the reading to stabilise.

  • Page 50: Setting The Air/Gas Ratio

    6. Commissioning Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 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.

  • Page 51: Finalizing Work

    Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 6. Commissioning 2. Set the percentage CO for the gas type being used inside the highest and the lowest setting limit, as determined after the full load setting.

  • Page 52: Parameter Descriptions

    6. Commissioning Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 Parameter descriptions Factory setting Parameter Description Adjustment range Combi System Flow temperature: T 20 to 90 °C Domestic hot water temperature: 40 to 65 °C...
  • Page 53 Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 6. Commissioning Factory setting Parameter Description Adjustment range Combi System 1 = Shutdown without frost-protection Shutdown input function 2 = Shutdown with frost protection 3 = Lock-out with frost protection (Pump only)

  • Page 54: Switching Off The Boiler

    7. Switching off the boiler Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 Switching off the boiler Installation shutdown If the central heating system is not used for a long period, we recommend switching the boiler off.

  • Page 55: Checking And Maintenance

    Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 8. Checking and maintenance Checking and maintenance General instructions WARNING Maintenance operations must be done by a qualified engineer. An annual inspection is compulsory. Only original spare parts must be used.

  • Page 56: Checking The Hydraulic Pressure

    8. Checking and maintenance Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 2. Remove the front panel. R000405-A 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).

  • Page 57: Checking The Dhw Transfer Capacity

    Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 8. Checking and maintenance 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.

  • Page 58: Checking The Condensate Trap

    8. Checking and maintenance Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 8.2.9. Checking the condensate trap CAUTION First remove the front housing of the boiler so that you can disconnect the condensate trap.

  • Page 59: Checking The Burner And Cleaning The Heat Exchanger

    Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 8. Checking and maintenance 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.

  • Page 60: Specific Maintenance Operations

    8. Checking and maintenance Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 Specific maintenance operations WARNING Ensure that the boiler is switched off. Electrical isolation can be checked at the electrical test point. CAUTION Always examine any seals or gaskets, replacing where necessary.

  • Page 61: Replacing The 3-Way Valve

    Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 8. Checking and maintenance 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.

  • Page 62: Cleaning The Domestic Water Cartridge

    8. Checking and maintenance Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 If descaling of the plate exchanger is necessary, proceed as follows: 1. Ensure that the boiler is switched off. Gas/Gaz 2. Close the gas valve of the boiler.

  • Page 63: Re-Assembling The Boiler

    Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 8. Checking and maintenance 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.
  • Page 64 8. Checking and maintenance Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 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.

  • Page 65: Troubleshooting

    Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 9. Troubleshooting Troubleshooting Error codes MainEco Combi 24 - 28 - 35 Domestic hot water temperature rotary knob Heating water temperature rotary knob Sweep key B and Status signals...
  • Page 66 9. Troubleshooting Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 Status signals Description Code Shutdown code 1 Temperature protection 5v[1 / 5v[2 / 5v[7 (1 times green signal) Shutdown code 2 5v[10 / 5v[11...

  • Page 67: Lock Out

    Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 9. Troubleshooting Shutdown Description Probable causes Checking / solution code Bad connection with BUS Check the wiring Communication error with 5v[13 SCU PCB missing from the SCU PCB...
  • Page 68 9. Troubleshooting Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 Status signals Description Code Error code 4 Fan fault e[34 (4 times red signal) Error code 5 e[00 / e[01 Parameter error (5 times red signal)
  • Page 69 Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 9. Troubleshooting Lock out (Status signals) Status Description Probable causes Checking / solution signals External draught over the Error code 4 Check for adequate draw on the chimney connection...
  • Page 70 9. Troubleshooting Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 Lock out (Error code - e[KK) Error Description Probable causes Checking / solution code Vent the air in the heating system Check the water pressure...
  • Page 71 Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 9. Troubleshooting Lock out (Error code - e[KK) Error Description Probable causes Checking / solution code Bad connection Replace the sensor if necessary Sensor fault Check the circulation (direction, pump, valves)

  • Page 72: 10 Spare Parts

    10. Spare parts Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 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.

  • Page 73: 11 Appendix

    Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 11. Appendix 11 Appendix 11.1 User instruction card R000392-A Group Signal Meaning Boiler in service Central heating heat (Intermittent green signal) Hot tap water Code A...

  • Page 74: 11.2 Gas Boiler System Commissioning Checklist

    11. Appendix Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 11.2 Gas boiler system commissioning checklist 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 75: 11.3 Service Record

    Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 11. 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...
  • Page 76 11. Appendix Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 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.
  • Page 77 Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 11. Appendix 02092014 - 7619497-02...
  • Page 78 11. Appendix Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24 02092014 - 7619497-02...
  • 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 For Baxi Customer Support and Technical Advice, contact us at 0844 871 1525 Please note calls may be monitored or recorded www.baxi.co.uk Open Monday - Friday, 8am - 6pm Weekends & Bank Holidays, 8.30am - 2pm We are closed on Christmas Day and New Year’s Day.

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