Main ECO ELITE COMBI 25 Installation & Service Manual
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Main ECO ELITE COMBI 25 Installation & Service Manual

Condensing central heating boiler
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United Kingdom
en
Installation & Service Manual
Condensing Central Heating Boiler
M M ain Eco Elite Combi
25 - 30
These instructions include the Benchmark Commissioning Checklist
and should be left with the user for safw keeping.

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Summary of Contents for Main ECO ELITE COMBI 25

  • Page 1 United Kingdom Installation & Service Manual Condensing Central Heating Boiler M M ain Eco Elite Combi 25 - 30 These instructions include the Benchmark Commissioning Checklist and should be left with the user for safw keeping.

  • Page 2: Natural Gas

    Natural Gas Building Regulations and the Benchmark Commissioning Checklist Main Eco Elite 25 Combi ErP G.C.N 47 467 12 Building Regulations (England & Wales) require notification of Main Eco Elite 30 Combi ErP the installation of a heating appliance to the relevant Local G.C.N...
  • Page 3 Installer Notification Guidelines Choose Building Regulations Notification Route Competent Person's Building Control Self Certification Scheme Install and Commission this Contact your relevant Local appliance to manufacturer's Authority Building Control instructions (LABC) who will arrange an inspection or contact a government approved inspector Complete the Benchmark Checklist...
  • Page 4 Economic Area of the following sealed water systems. BS 7593 Treatment of water in domestic hot water central heating systems. Main Eco Eliite 25 Combi ErP Main Eco Elite 30 Combi ErP In IE the following Codes of Practice apply: Standard Scope declare that the above is in conformity with the provisions of the Council Directive I.S.
  • Page 5 Safe Manual Handling General The following advice should be adhered to, from when first handling the boiler to the final stages of installation, and also during maintenance. Most injuries as a result of inappropriate handling and lifting are to the back, but all other parts of the body are vulnerable, particularly shoulders, arms and hands. Health &...

  • Page 6: Table Of Contents

    CONTENTS Section Page Introduction General Layout Appliance Operation Technical Data Dimensions and Fixings System Details Site Requirements Flue Options Installation 10.0 Commissioning 11.0 Completion 12.0 Servicing 13.0 Changing Components 14.0 Setting the Gas Valve 15.0 Electrical 16.0 Short Parts List 17.0 Fault Finding 18.0...

  • Page 7: Introduction

    1.0 Introduction Description 1. The Main Eco Elite Combi is a fully automatic gas fired wall mounted condensing combination boiler. It is room sealed and fan assisted, and will serve central heating and mains fed Case Front Panel domestic hot water.

  • Page 8: General Layout

    2.0 General Layout Layout Expansion Vessel Automatic Air Vent DHW Plate Heat Exchanger Circulation Pump Drain Off Point Pressure Relief Valve Selector Switch Central Heating System Pressure Gauge Control Box 3-Way Valve Assembly Condensate Trap Heat Exchanger Air Vent Electrode Assembly Primary Heat Exchanger Fan Assembly On/Off/Reset Selector Switch...

  • Page 9: Appliance Operation

    Central Heating Circuit 1. With a demand for heating, the pump circulates water through the primary circuit. 2. Once main burner ignites the fan speed controls the gas rate to maintain the heating temperature measured by the temperature sensor. 3. When the flow temperature exceeds the setting temperature, a 3 minute delay occurs before the burner relights automatically (anti-cycling).

  • Page 10: Technical Data

    4.0 Technical Data Main Eco Elite 25 & 30 Combi ErP Appliance Type NO x Class Inlet Pressure (Natural Gas - G20) mbar Appliance Category CAT I Central Heating Primary Circuit Pressures Injector (Natural Gas - G20) Heat Input CH Qn Hs (Gross) 6.0mm...
  • Page 11 4.0 Technical Data Technical Parameters Technical parameters for boiler combination heaters Main Eco Elite Combi ErP Condensing boiler Low-temperature boiler B1 boiler Cogeneration space heater Combination heater Rated heat output Prated Useful heat output at rated heat output 25.9 28.6...

  • Page 12: Dimensions And Fixings

    5.0 Dimensions and Fixings Dimensions A 780mm At Least 1.5 B 345mm C 450mm D 116mm Ø Min. F 145mm G 106mm 210mm (80/125) H 225mm 360° Orientation Tube Ø 100mm Tap Rail 127 mm Condensate Drain 65 mm 65 mm 65 mm 65 mm 65 mm...

  • Page 13: System Details

    6.0 System Details Information 1. The Main Eco Elite Combi Condensing Combination Boiler is a ‘Water Byelaws Scheme - Approved Product’. To comply with the Water Byelaws your attention is drawn to the following installation requirements and notes (IRN). a) IRN 001 - See text of entry for installation requirements and notes.
  • Page 14 6.0 System Details System Filling and Pressurising (Fig. 4) Double 1. A filling point connection on the central heating return Stop Stop Check pipework must be provided to facilitate initial filling and Valve Valve Valve pressurising and also any subsequent water loss replacement/refilling.
  • Page 15 6.0 System Details Domestic Hot Water Circuit (Fig. 7) 1. All DHW circuits, connections, fittings, etc. should be fully in accordance with relevant standards and water supply regulations. Other Tap Outlets 2. Your attention is drawn to: for GB: Guidance G17 to G24 and recommendation R17 to Boiler Expansion R24 of the Water Regulations Guide.

  • Page 16: Site Requirements

    7.0 Site Requirements 5mm Min 450mm 5mm Min Location 1. The boiler may be fitted to any suitable wall with the flue 175mm Min passing through an outside wall or roof and discharging to (300mm Min if using 80/125mm atmosphere in a position permitting satisfactory removal of flueing system) combustion products and providing an adequate air supply.
  • Page 17 7.0 Site Requirement Gas Service Cock Ventilation of Compartments 1. Where the appliance is installed in a cupboard or compartment, no air vents are required. 2. BS 5440: Part 2 refers to room sealed appliances installed in compartments. The appliance will run sufficiently cool without ventilation.
  • Page 18 Examples are shown of the following methods of termination:- i) to an internal soil & vent pipe 7.0 Site Requirements ii) via an internal discharge branch (e.g. sink waste) downstream of the trap iii) to a drain or gully iv) to a purpose made soakaway v) pumped into an internal discharge branch (e.g.
  • Page 19 v) pumped into an internal discharge branch 7.0 Site Requirements (e.g. sink waste) downstream of the trap Pipe must terminate above Sink Condensate Drain (cont.) water level but below surrounding surface. Cut end at 45° 12. A boiler discharge pump is available, ‘MULTIFIT’ part no.
  • Page 20 Terminal Position with Minimum Distance (Fig. 14) (mm) 7.0 Site Requirements Directly below an opening, air brick, opening windows, etc. Above an opening, air brick, opening window etc. Horizontally to an opening, air brick, opening window etc. Flue (Figs. 13 & 14) Below gutters, soil pipes or drain pipes.

  • Page 21: Flue Options

    8.0 Flue Options Horizontal Flue Systems 1. The standard flue is suitable only for horizontal termination applications. 2. All fittings should be fully engaged. The approximate engagement is 40mm. Apply the lubricant supplied to the seal on each fitting to aid assembly. 3.
  • Page 22 8.0 Flue Options Flue Lengths The standard horizontal telescopic flue kit allows for lengths between 315mm and 500mm from elbow to terminal without the need for cutting (Fig. 15). Extensions of 250mm, 500mm & 1m are available. The maximum permissible equivalent flue length is: 10 metres (60/100 system - vertical &...

  • Page 23: Installation

    1.0 Introduction 9.0 Installation Unpacking & Initial Preparation The gas supply, gas type and pressure must be checked for suitability before connection (see Section 7.4). NOTE: a small amount of water may drain from the boiler in the upright position. 1.
  • Page 24 9.0 Installation Fitting The Boiler (Fig. 21) 1. Remove the sealing caps from the boiler connections. Remove Sealing Caps from NOTE: A small amount of water may drain from the boiler under the Boiler after lifting once the caps are removed. into position 2.
  • Page 25 9.0 Installation Fitting The Flue HORIZONTAL TELESCOPIC FLUE 1. There are two telescopic sections, the Terminal Terminal Assembly Assembly and the Connection Assembly, a roll of sealing tape and two self tapping screws. A 93° elbow is also supplied. Connection Assembly 2.
  • Page 26 Flue Elbow 9.0 Installation Fitting the Flue (Cont) Adaptor 10. Remove the flue elbow and insert the flue through the hole in the wall. 11. Refit the elbow to the boiler adaptor, ensuring that it is pushed fully in (Fig. 27). 12.
  • Page 27 9.0 Installation Making The Electrical Connections NOTE: Both the Live and Neutral connections are fused. Integral Timer: If required the integral timer supplied in the boiler installation kit should be fitted at this stage. Fitting instructions are included with it. To connect an external control proceed as follows:- 1.

  • Page 28: Commissioning

    Heat Exchanger 10.0 Commissioning Automatic Air Vent Fig. 34 10.1 Commissioning the Boiler 1. Reference should be made to BS:EN 12828 & 14336 when commissioning the boiler. 2. At the time of commissioning, complete all relevant sections of the Benchmark Checklist at the rear of this publications. 3.
  • Page 29 Set Boiler to Maximum Rate 10.0 Commissioning (see 10.1.11) Allow the combustion to stabilise. Do not insert probe to 10.2 Checking Combustion avoid ‘flooding’ the analyser. 1. Follow the flow chart opposite. Perform Flue Integrity Combustion Check Insert the analyser probe into the air inlet test point, allowing the reading to stabilise.
  • Page 30 10.0 Commissioning 10.3 Check the Operational (Working) Gas Inlet Pressure 1. Ensure that all controls are calling for heat, and the selector switch is in the central heating and hot water position ( The current boiler temperature is shown on the display. Central Heating Domestic Hot Water Temperature Control...

  • Page 31: Completion

    11.0 Completion 11.1 Completion Case Front Panel 1. Instruct the user in the operation of the boiler and system including the integral timer, explaining the operational sequence. 2. Set the central heating and hot water temperature control knobs to the requirements of the user. 3.

  • Page 32: Servicing

    12.0 Servicing 12 .1 Annual Servicing 1. For reasons of safety and economy, it is recommended that Case Front Panel the boiler is serviced annually. Servicing must be performed by a competent person in accordance with B.S. 7967-4. 2. After servicing, complete the relevant Service Interval Record section of the Benchmark Commissioning Checklist at the rear of this publication.
  • Page 33 Injector 12.0 Servicing Gas/Air Inlet 12.2 Annual Servicing - Inspection (Cont) 6. Undo the nut on the gas pipe at the gas/air inlet (Fig. 49) and the gas valve. Remove the pipe, taking care not to lose the sealing washers. Also remove the injector. Gas Pipe 7.

  • Page 34: Changing Components

    13.0 Changing Components IMPORTANT: When changing components ensure that both the gas and electrical supplies to the boiler are isolated before any work is started. When the component has been changed turn the selector switch fully anticlockwise against the spring pressure to the Igniter reset position and hold for 5 seconds to reset the boiler before recommissioning.
  • Page 35 13.0 Changing Components Injector Gas/Air Inlet 13.3 1. Undo the nut on the gas pipe at the gas/air inlet (Fig. 56) and the gas valve. Remove the pipe, taking care not to lose the sealing washers. Also remove the injector. Gas Pipe 2.
  • Page 36 13.0 Changing Components 13.5 Burner (Fig. 59) 1. Undo the nut on the gas pipe at the gas/air inlet and the gas valve. Remove the pipe, taking care not to lose the sealing washers. Also remove the injector. 2. Disconnect the electrode lead caps, remove the strain relief clip from the sensing lead and disconnect the lead.
  • Page 37 13.0 Changing Components 13.7 Safety Thermostat (Fig. 60) 1. Pull the plug off the thermostat. 2. Remove the screws securing the thermostat to the mounting plate on the flow pipe. Safety Thermostat 3. Reassemble in reverse order, ensuring that the plug is pushed fully on.
  • Page 38 13.0 Changing Components Heat Exchanger Air Vent 13.11 Heat Exchanger Automatic Air Vent (Fig. 63 ) 1. Drain the boiler primary circuit and unscrew the automatic air vent from the pump body. 2. Examine the ‘O’ ring seal, replacing if necessary, and fit it to the new automatic air vent.
  • Page 39 13.0 Changing Components 13.15 Pressure Gauge (Figs. 66 & 67) Gauge Retaining Bracket 1. Drain the boiler primary circuit and undo the nut on the pressure gauge capillary. 2. Undo the screws securing the gauge retaining bracket. 3. Remove the bracket and gauge assembly. Depress the barbs on the side of the gauge and remove the retaining bracket.
  • Page 40 13.0 Changing Components 13.18 Plate Heat Exchanger (Fig. 70) 1. Drain the boiler primary circuit and remove the gas valve Plate Heat Exchanger as described in section 13.23. 2. While supporting the heat exchanger undo the screws securing it to the brass manifolds. 3.
  • Page 41 13.0 Changing Components 13.20 P.C.B. (Figs. 72 & 73) 1. Note the settings of the temperature control knobs, rotate them fully anticlockwise and carefully pull them off the drive pins. 2. Completely undo the screws securing the control box cover and release the cover retaining barbs from their slots. 3.

  • Page 42: Changing Gas Valve / Expansion Vessel

    Venturi Inlet 13.0 Changing Components Pipe 13.23 Gas Valve (Fig. 74) Gas Valve IMPORTANT: After replacing the valve the CO must be checked and adjusted as detailed in Section 14.0 Setting Sensing Pipe the Gas Valve. Only change the valve if a suitable calibrated combustion analyser is available, operated by a competent - see section 12.1.

  • Page 43: Setting The Gas Valve

    14.0 Setting the Gas Valve 14.1 Setting the Gas Valve (CO check) IMPORTANT: The CO must be only be checked and adjusted to set the valve if a suitable calibrated combustion analyser is available, operated by a competent Central Heating person - see Section 13.1 Domestic Hot Water Temperature Control...

  • Page 44: Electrical

    15.0 Electrical 15.1 Illustrated Wiring Diagram Central Heating NTC Sensor gr gr NTC Sensor Overheat Stat Hall Effect Sensor Water Pressure Switch X400 X401 9 8 7 6 5 4 3 2 1 8 7 6 5 4 3 2 1 Integral Timer (where fitted) Control PCB X501...

  • Page 45: Short Parts List

    16.0 Short Parts List Short Parts List G.C. Description Manufacturers Part No. 5121447 Motor 3 Way Valve 5132452 Electrode Assembly 5130293 Gas Valve 720301001 Hall Effect Sensor 5114767 Burner 5130292 Water Pressure Switch 5114748 Plate Heat Exchanger 248048 Pump 7222703 NTC Sensor DHW 5114725 Overheat Thermostat...

  • Page 46: Fault Finding

    17.0 Fault Finding 17.1 Initial Fault Finding Checks NOTE: When instructed to turn the 1. Check that gas, water and electrical supplies are available selector to the reset position turn the at the boiler. selector switch fully anticlockwise against the spring pressure to the reset position 2.
  • Page 47 17.0 Fault Finding Refer to Section 16.0 “Illustrated Wiring Diagram” for position of terminals and components Central Heating - Follow operational sequence (do Turn selector switch to Go to section ‘A’ The display illuminates Error 110 flashing If the error 110 is still flashing. Turn the selector switch to Error 130 flashing reset position for 5 seconds...
  • Page 48 17.0 Fault Finding Domestic Hot Water - Follow operational sequence Turn selector switch to Go to section ‘A’ The display illuminates Error 110 flashing Turn the selector switch to If the error 110 is still flashing. Error 133 flashing Go to section ‘J’ reset position for 5 seconds Error 20, 28 or 50 flashing Go to section ‘E’...
  • Page 49 17.0 Fault Finding Fault Finding Solutions Sections Is there 230V at: Main terminals L and N Check electrical supply Main terminal fuse Replace fuse Display Replace PCB illuminated Check wiring PCB - X1 connector terminals 1,2 Is there 230V at:...
  • Page 50 17.0 Fault Finding E20 or E50 - Temperature sensors faulty. Cold resistance approximately 10kê @ 25° C (DHW and CH sensors) Replace sensor or PCB (E28) 20kê @ 25° C (Flue sensor) (resistance reduces with increase in temp.) E28 - Incorrect PCB fitted Check and correct the connection of the tube between the venturi and gas valve Gas at burner...
  • Page 51 17.0 Fault Finding Check supply pressure at the gas valve:- Minimum 17 mbar Check and correct if necessary 1. The mechanical set of the gas valve (CO2 values - see instruction) 2. Flame sensing electrode and lead connections 3. Flame sensing electrode position Replace PCB Flame current should be more than 0.5 ¡...

  • Page 52: Notes

    18.0 Notes © Baxi Heating UK Ltd 2015...
  • Page 53 18.0 Notes © Baxi Heating UK Ltd 2015...

  • Page 54: Benchmark Checklist

    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. Failure to install and commission according to the manufacturer’s instructions and complete this Benchmark Commissioning Checklist will invalidate the warranty.

  • Page 55: Service Record

    SERVICE RECORD 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. SERVICE 01 SERVICE 02 Date:...

  • Page 56: Description

    Baxi Customer Support 0344 871 1525 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 with Baxi The boiler has an annual service...

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