Main Combi 25 Eco Elite Installation & Service Instructions Manual
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Main Combi 25 Eco Elite Installation & Service Instructions Manual

Combi eco elite series
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Combi Eco Elite
Installation & Service Instructions
Range
These instructions include the Benchmark Commissioning Checklist
and should be left with the user for safe keeping.
© Baxi Heating UK Ltd 2014

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Summary of Contents for Main Combi 25 Eco Elite

  • Page 1 Combi Eco Elite Installation & Service Instructions Range These instructions include the Benchmark Commissioning Checklist and should be left with the user for safe keeping. © Baxi Heating UK Ltd 2014...
  • Page 2 Natural Gas Building Regulations and the Benchmark Commissioning Checklist Main Combi 25 Eco Elite G.C.N 47 467 08 Building Regulations (England & Wales) require notification of Main Combi 30 Eco Elite 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 Legislation IMPORTANT - Installation, Commissioning, Service & Repair This company declare that no substances harmful to health are contained in the appliance or used during appliance This appliance must be installed in accordance with the manufacturer’s instructions and manufacture. the regulations in force. Read the instructions fully before installing or using the appliance.
  • 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 Plume Displacement 10.0 Installation 11.0 Commissioning 12.0 Completion 13.0 Servicing 14.0 Changing Components 15.0 Setting the Gas Valve 16.0 Electrical 17.0 Short Parts List 18.0 Fault Finding...

  • Page 7: Introduction

    1.0 Introduction Description 1. The Main Combi Eco Elite 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 Combi 25 & 30 Eco Elite 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 (Net) 6.0mm 25 model 26.06 7.82...

  • Page 11: 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 132mm 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 12: System Details

    6.0 System Details Information 1. The Main Combi Eco Elite 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 13 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 14 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 15: 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 200mm 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 16 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 17 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 18 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 19 Terminal Position with Minimum Distance (Fig. 18) (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. 17 & 18) Below gutters, soil pipes or drain pipes.

  • Page 20: Flue Options

    8.0 Flue Options Horizontal Flue Systems 1. The standard flue is suitable only for horizontal termination applications. (ii) 2. Maximum permissible equivalent flue lengths are:- (60/100) (80/125) Horizontal Concentric 10 metres 20 metres 3. Any additional “in line” bends in the flue system must be taken into consideration.
  • Page 21 8.0 Flue Options Vertical Flues Twin & Vertical Flue Systems (ii) 1. Maximum permissible equivalent flue lengths are:- (60/100) (80/125) Vertical Concentric 10 metres 20 metres Twin Pipe 20 metres 3. Any additional “in line” bends in the flue system must be taken into consideration.
  • Page 22 8.0 Flue Options Flue Accessories Accessory Size Code No FLUE GROUP A Concentric Flue System 100mm diameter Telescopic Internal Flue Kit 315-500mm 5119654 Telescopic Flue (incl elbow) 5118069 Horizontal Flue Terminal (incl elbow) 5118489 Flue Extension 1000mm 5111074 Flue Bend 93°...
  • Page 23 8.0 Flue Options Twin Flue Duct Adaptor 1. The kit allows connection of a twin flue system to the Air Duct Connection boiler adaptor. Flue Duct Connection Twin Flue Connection 1. Engage the twin flue duct adaptor in the boiler adaptor, making sure that it is pushed down as far as possible.
  • Page 24 8.0 Flue Options For Roof Terminals 1. In the case of a pitched roof 25 - 50 degrees, position the lead Approx tile to replace/flash over existing roof tiling. Make an aperture in 1425mm the roof suitable for the lower tube of the roof terminal and ensure the integrity of the roof cover is maintained.

  • Page 25: Plume Displacement

    NOTE: Permitted positions of the plume outlet relative to doors, windows etc. are the same as for conventional concentric flues as detailed in the main Installation & Servicing Instructions and BS5440 Pt. 1. It is NOT necessary to fit a terminal guard over the air inlet or the plume outlet.
  • Page 26 60Ø Exhaust Bracket 45° Elbow Flue Length - Worked Example Main Combi Eco Elite 30 93° Elbow In Fig. 27 opposite an additional 93° elbow and pair of 45° elbows have been included in the 60Ø exhaust. 1 metre Extension Concentric 60/100 Flue Also 3 straight extension pieces have been used.
  • Page 27 9.0 Plume Displacement General Fitting Notes 1. Cut a hole in the external wall which the concentric flue assembly will pass through. The hole should allow the flue to fall back to the boiler at an angle of at least 1.5°. 2.
  • Page 28 9.0 Plume Displacement Plume Outlet Elbow General Fitting Notes (cont.) 15. For aesthetic purposes it is permissible to route the 60Ø exhaust in an enclosed box, but the air inlet and plume outlet MUST remain in free air. 16. It is also possible to separate the plume outlet from the 93°...

  • Page 29: Installation

    10.0 Installation 10.1 Unpacking & Initial Preparation The gas supply, gas type and pressure must be checked for suitability before connection (see Section 7.4). 1. Remove staples, open flaps and remove cardboard sheet. Remove the polystyrene side pieces and literature. Two people can then lift out the boiler (Fig.
  • Page 30 10.0 Installation 10.3 Fitting The Boiler 1. Lift the boiler using the Lifting Points as shown by the shaded areas (Fig. 43) The boiler should be lifted by TWO PEOPLE. Engage the slots at the top rear of the boiler on the wall plate (Fig.
  • Page 31 10.0 Installation 10.6 Fitting The Flue HORIZONTAL FLUE 1. The standard flue is suitable for lengths between 100mm Fig. 45 minimum and 685mm maximum, as measured from the edge of the flue elbow outlet to the joint between the terminal and air duct (Fig. 45). 2.
  • Page 32 10.0 Installation Inner Flue Support Bracket 10.6 Fitting the Flue (Cont) 6. The inner flue duct support bracket may be in the waste portion of the flue. In this case retrieve the bracket before discarding the waste. 7. Take the inner flue support bracket (if not already fitted) Fig.
  • Page 33 10.0 Installation 10.7 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 34: Commissioning

    Heat Exchanger 11.0 Commissioning Automatic Air Vent Fig. 58 11.1 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 35 Set Boiler to Maximum Rate 11.0 Commissioning (see 11.1.11) Allow the combustion to stabilise. Do not insert probe to 11.2 Checking Combustion avoid ‘flooding’ the analyser. 1. This procedure is mandatory in GB from April 2014. It is strongly recommended to perform the procedure before that Perform Flue Integrity date.
  • Page 36 11.0 Commissioning 11.3 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 37: Completion

    12.0 Completion 12.1 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 38: Servicing

    13.0 Servicing 13 .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 39 Injector 13.0 Servicing Gas/Air Inlet 13.2 Annual Servicing - Inspection (Cont) 6. Undo the nut on the gas pipe at the gas/air inlet (Fig. 72) and the gas valve. Remove the pipe, taking care not to lose the sealing washers. Also remove the injector. Gas Pipe 7.

  • Page 40: Changing Components

    14.0 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 41 14.0 Changing Components Injector Gas/Air Inlet 14.3 1. Undo the nut on the gas pipe at the gas/air inlet (Fig. 79) and the gas valve. Remove the pipe, taking care not to lose the sealing washers. Also remove the injector. 2.
  • Page 42 14.0 Changing Components 14.5 Burner (Fig. 82) 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 43 14.0 Changing Components 14.7 Safety Thermostat (Fig. 65) 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 44 14.0 Changing Components Heat Exchanger Air Vent 14.11 Heat Exchanger Automatic Air Vent (Fig. 86 ) 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 45 14.0 Changing Components 14.15 Pressure Gauge (Figs. 90 & 91) 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 46 14.0 Changing Components 14.18 Plate Heat Exchanger (Fig. 94) 1. Drain the boiler primary circuit and remove the gas valve Plate Heat Exchanger as described in section 14.22. 2. While supporting the heat exchanger undo the screws securing it to the brass manifolds. 3.
  • Page 47 14.0 Changing Components 14.20 P.C.B. (Figs. 97 & 98) 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. Disengage the rear of the cover from the control box hinge pin.
  • Page 48 Venturi Inlet 14.0 Changing Components Pipe 14.22 Gas Valve (Fig. 99) Gas Valve IMPORTANT: After replacing the valve the CO must be checked and adjusted as detailed in Section 15.0 Setting Sensing Pipe the Gas Valve. Only change the valve if a suitable calibrated combustion analyser is available, operated by a competent - see section 13.1.

  • Page 49: Setting The Gas Valve

    15.0 Setting the Gas Valve 15.1 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 50: Electrical

    16.0 Electrical 16.1 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 51: Short Parts List

    17.0 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 248042 NTC Sensor DHW 5114725 Overheat Thermostat...

  • Page 52: Error Codes

    18.0 Fault Finding 18.1 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 53 18.0 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 54 18.0 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 55 18.0 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 56 18.0 Fault Finding E20 or E50 - Temperature sensors faulty. Cold resistance approximately 10kΩ @ 25° C (DHW and CH sensors) Replace sensor or PCB (E28) 20kΩ @ 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 57 18.0 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 μ...

  • Page 58: 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 59: 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 60: Description

    All descriptions and illustrations provided in this leaflet 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.

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