Main Combi 25 Eco Elite Installation & Service Manual Download | Manualshive

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1.0 Introduction

© Baxi Heating UK Ltd 2015

1.1

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
domestic hot water.

2. The boiler is set to give a maximum output of :-

25 model -

25.94 kW DHW
26.95 kW CH Pnc (Condensing)

30 model -

28.63 kW DHW
30.2 kW CH Pnc (Condensing)

3. It is designed for use on Natural Gas (G20).

4. The boiler is suitable for use only on fully pumped sealed
heating systems. Priority is given to domestic hot water.

5. The boiler data badge gives details of the model, serial
number and Gas Council numbe. It is visible when the case front
panel is removed (Fig. 1).

6. The boiler model name and serial number are also shown on
the information label on the back of the facia door. This is for
user reference.

7. The boiler is intended to be installed in residential / domestic
environments on a governed meter supply only.

8. The boiler must be installed with one of the purpose
designed flues such as the standard horizontal flue kit, part no.
5118489 .

9.

All systems must be thoroughly flushed and treated with

inhibitor (see section 6.2).

1.2

Contents of Pack

1. Boiler Unit
2. Wall Plate (inc. taps)
3. Set of Pipes (inc. nuts)
4. Template
5. Literature Pack
7. Filling Loop
8. 24 hr. Electro - Mechanical Timer

Fig. 1

Control Box

Case Front Panel

Information Label

Facia Door

Data Badge

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Summary of Contents for Combi 25 Eco Elite

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

Page 2: ...ecklist 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 Baxi Heating UK Ltd 2015 All rights reserved No part of this publication may be reproduced or transmitted in any form or by any means or stored in any retrieval system of any nat...

Page 3: ...elevant 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 Instal...

Page 4: ...d treated with inhibitor see section 6 2 The boiler meets the requirements of Statutory Instrument The Boiler Efficiency Regulations 1993 No 3083 and is deemed to meet the requirements of Directive 92 42 EEC on the energy efficiency requirements for new hot water boilers fired with liquid or gaseous fuels Type test for purpose of Regulation 5 certified by Notified Body 0086 Product Production cert...

Page 5: ...s clear and unobstructed If possible avoid steps wet or slippery surfaces unlit areas etc and take special care on ladders into lofts Technique When handling or lifting always use safe techniques keep your back straight bend your knees Don t twist move your feet avoid bending forwards and sideways and keep the load as close to your body as possible Where possible transport the boiler using a sack ...

Page 6: ...ns and Fixings 12 6 0 System Details 13 7 0 Site Requirements 16 8 0 Flue Options 21 9 0 Installation 23 10 0 Commissioning 28 11 0 Completion 31 12 0 Servicing 32 13 0 Changing Components 34 14 0 Setting the Gas Valve 43 15 0 Electrical 44 16 0 Short Parts List 45 17 0 Fault Finding 46 18 0 Notes 52 Benchmark Checklist 54 Section Page ...

Page 7: ...ils of the model serial number and Gas Council numbe It is visible when the case front panel is removed Fig 1 6 The boiler model name and serial number are also shown on the information label on the back of the facia door This is for user reference 7 The boiler is intended to be installed in residential domestic environments on a governed meter supply only 8 The boiler must be installed with one o...

Page 8: ...te Trap 13 Heat Exchanger Air Vent 14 Electrode Assembly 15 Primary Heat Exchanger 16 Fan Assembly 17 On Off Reset Selector Switch 18 Central Heating Temperature Control 19 Hot Water Temperature Control 20 Water Pressure Sensor 21 Gas Air Inlet 22 Burner Mounting Panel 23 Igniter 24 Burner On Light 25 Central Heating Mode Light 26 Domestic Hot Water Mode Light 27 Display 28 Position for Integral T...

Page 9: ...ler will not operate and the integral timer will require resetting once the selector switch is set to either Position or Position 3 3 Frost Protection Mode 1 The frost protection mode is integral to the appliance and functions only with the selector switch see Section 2 1 in the domestic hot water and central heating position If the system temperature falls below 5 C then the boiler will fire on i...

Page 10: ...175 mm Min 300mm Min 80 125 Below Casing 200 mm Min Front 450 mm Min For Servicing Front 5 mm Min In Operation L H Side 5 mm Min R H Side 5 mm Min In Operation Heat Output CH Pn Non Condensing Max Min 25 model kW 25 94 7 61 30 model kW 28 63 8 56 Electrical Supply 230V 50Hz Appliance must be connected to an earthed supply Power Consumption 25 30 105W Electrical Protection IPX0D with timer IPX4D wi...

Page 11: ...stby kW Ignition burner power consumption Pign kW Annual energy consumption QHE kWh GJ Sound power level indoors LWA dB mg kWh Emissions of nitrogen oxides NOX Daily electricity consumption Domestic hot water parameters Declared load profile Water heating energy efficiency Qelec kWh Annual electricity consumption AEC kWh Šwh Daily fuel consumption Qfuel kWh Annual fuel consumption AFC GJ 1 Low tem...

Page 12: ... Ø Min F 145mm G 106mm 210mm 80 125 H 225mm Domestic Hot Water Outlet 15mm Cold Water Inlet 15mm Heating Return 22mm Heating Flow 22mm Pressure Relief Valve 15mm Gas Inlet 22mm 65 mm 65 mm 65 mm 65 mm 65 mm 127 mm Condensate Drain Tap Rail 360 Orientation Tube Ø 100mm D C B A G F At Least 1 5o H H ...

Page 13: ...m which can lead to damage of system components All systems must be thoroughly drained and flushed out using for example Sentinel X300 or X400 or Fernox F3 They should be used following the flushing agent manufacturer s instructions System additives corrosion inhibitors and flushing agents descalers should comply to BS7593 requirements e g Sentinel X100 and Fernox MB 1 which should be used followi...

Page 14: ...tral Heating only 1 The appliance expansion vessel is pre charged to 0 5 bar Therefore the minimum cold fill pressure is 0 5 bar The vessel is suitable for correct operation for system capacities up to 125 litres For greater system capacities an additional expansion vessel MUST be fitted For GB refer to BS 7074 Pt 1 For IE the current edition of I S 813 Domestic Gas Installations 6 7 Safety Pressu...

Page 15: ...ment device already fitted to the wholesome water supply connected to the boiler domestic hot water DHW inlet supply then a suitable expansion device may be required 5 If the hot water expansion is not provided for then high pressures can develop which may result in damage to fittings and devices on the system 6 The boiler s maximum working mains pressure is 8 bar therefore all pipework connection...

Page 16: ...vant requirements In GB this is the current I E E Wiring Regulations and Building Regulations In IE reference should be made to the current edition of I S 813 Domestic Gas Installations and the current ETCI rules 4 If the boiler is to be fitted into a building of timber frame construction then reference must be made to the current edition of Institute of Gas Engineers Publication IGE UP 7 Gas Inst...

Page 17: ...ations In IE reference should be made to the current edition of ETCI rules 2 The mains supply is 230V 50Hz fused at 3A NOTE The method of connection to the electricity supply must facilitate complete electrical isolation of the appliance Connection may be via a fused double pole isolator with a contact separation of at least 3mm in all poles and servicing the boiler and system controls only 7 6 Ba...

Page 18: ... with material suitable for external use 9 If the boiler is fitted in an unheated location the entire condensate discharge pipe should be treated as an external run and sized and insulated accordingly 10 In all cases discharge pipe must be installed to aid disposal of the condensate To reduce the risk of condensate being trapped as few bends and fittings as possible should be used and any burrs on...

Page 19: ...ce Heating Element is NOT a substitute for correct installation of the condensate drain ALL requirements in this section must still be adhered to Boiler vi pumped into an external soil vent pipe 2 5 Minimum fall 50mm per metre of pipe run Condensate Pump Unheated Location e g Garage Basement or similar heated Boiler 2 5 Minimum fall 50mm per metre of pipe run Pipe must terminate above water level ...

Page 20: ...ith the diagram below Opening Window or Door 150mm MIN IMPORTANT If fitting a Plume Displacement Flue Kit the air inlet must be a minimum of 150mm from any opening windows or doors Plume Displacement Kit Air Inlet Terminal Position with Minimum Distance Fig 14 mm A1 Directly below an opening air brick opening windows etc 300 B1 Above an opening air brick opening window etc 300 C1 Horizontally to a...

Page 21: ...missible equivalent flue lengths are 60 100 80 125 Horizontal Concentric 10 metres 20 metres 4 Any additional in line bends in the flue system must be taken into consideration Their equivalent lengths are Concentric Pipes 135 bend 0 5 metres 93 bend 1 0 metres 5 The elbow supplied with the standard horizontal telescopic flue kit is not included in any equivalent length calculations NOTE Flue lengt...

Page 22: ...terminal and fixed as illustrated 8 5 Flue Deflector 1 Push the flue deflector over the terminal end It may point upwards as shown or up to 45 either way from vertical Secure the deflector to the terminal with screws provided 8 6 Flue Accessories Fig 16a 1 For full details of Flue Accessories elbows extensions clamps etc refer to the Flue Installation Guide supplied in the literature pack Baxi Hea...

Page 23: ...both horizontally and vertically 5 Mark the position of the two most suitable fixing slots for the wall plate and boiler lower fixing holes It is preferable to use the vertical fixing slots 6 Mark the position of the centre of the flue hole rear exit For side flue exit mark as shown Fig 19 7 If required mark the position of the gas and water pipes Remove the template 8 Cut the hole for the flue mi...

Page 24: ...ilding See section 6 7 for further details 4 Utilising one of the sealing washers connect the discharge pipe to the adaptor and tighten the nut 5 Complete the discharge pipework and route it to the outside discharge point IMPORTANT Make all soldered joints before connecting to the pressure relief valve 9 5 Condensate Drain see section 7 7 1 Connect the condensate drain to the trap outlet pipe Ensu...

Page 25: ...ow This dimension will be known as X Fig 23 5 If the distance from the flue elbow to the outside face of the wall X in Fig 23 is less than 250mm the Connection Assembly can be discarded and the Terminal Assembly fitted directly into the elbow 6 In instances where the dimension X Fig 23 is between 250mm and 315mm it will be necessary to shorten the Terminal Assembly by careful cutting to accommodat...

Page 26: ...y to lubricate to ease assembly of the elbow and flue Fig 28 15 Ensure that the terminal is positioned with the slots to the bottom Fig 29 Secure the flue to the elbow with the screws supplied Fig 28 16 Secure the elbow flue to the boiler adaptor with the screws supplied in the boiler fittings pack Fig 28 IMPORTANT It is essential that the flue terminal is fitted as shown to ensure correct boiler ...

Page 27: ...ve the cover Fig 31 4 Slacken the unused cable clamp on the LH side of the boiler chassis Fig 32 Insert the external control wiring through the clamp and route it to the terminal block 5 Refer to the instructions supplied with the control IMPORTANT The room thermostat MUST be suitable for 230V switching NOTE An external frost thermostat cannot be used in conjunction with the integral timer supplie...

Page 28: ...elevant seals Proceed to put the boiler into operation as follows 11 The Combustion Check procedure as shown by the chart in 10 2 is mandatory The method of setting the boiler to operate at maximum and minimum rates to comply with the procedure is described below 12 Ensure that all external controls are calling for heat The actual current boiler temperature is shown on the display 13 Turn both con...

Page 29: ...nal flue seals door case seals Replace any seals that appear unsound Is CO 350ppm and CO CO2 ratio 0 004 TURN APPLIANCE OFF Call 0344 871 1525 for advice The appliance MUST NOT be commissioned until all problems are identified and resolved If commissioning cannot be fully completed the appliance must be disconnected from the gas supply in accordance with the GSIUR Note Check record the CO combusti...

Page 30: ... be obtained with all other gas appliances in the property working Measure the Gas Rate 8 With any other appliances pilot lights turned OFF the gas rate can be measured It should be between 25 model 2 76 m3 h 30 model 3 17 m3 h 9 The Calibration Function is active for 20 minutes unless the maximum CH temperature is exceeded 10 The function can be disabled at any time by turning the DHW temperature...

Page 31: ...re relevant to the appliance and installation These details will be required in the event of any warranty work The publication must be handed to the user for safe keeping and each subsequent regular service visit recorded 4 For IE it is necessary to complete a Declaration of Conformity to indicate compliance with I S 813 An example of this is given in I S 813 Domestic Gas Installations This is in ...

Page 32: ... requirements of BS7927 or BS EN50379 3 and be calibrated in accordance with the analyser manufacturers requirements Competence can be demonstrated by satisfactory completion of the CPA1 ACS assessment which covers the use of electronic portable combustion gas analysers in accordance with BS 7967 Parts 1 to 4 Check the Combustion Performance CO CO2 ratio 4 Set the boiler to operate at maximum rate...

Page 33: ...ow of domestic hot water is diminished it may be necessary to clean the filter 14 Initially check the cold water inlet tap filter 15 Turn the tap off and draw off from a hot tap Undo the blanking cap and remove the threaded bush Fig 52 16 Extract the filter and rinse thoroughly in clean water Reassemble and check the flow If required clean the restricter filter as described below 17 Pull off the H...

Page 34: ...54 1 Disconnect the igniter feed plug and the electrode leads noting their positions 2 Undo the nuts and screws securing the igniter to the boiler top panel Remove the igniter 3 Fit the new igniter and reassemble in reverse order 13 2 Electrode Assembly Fig 55 1 Disconnect the electrode lead caps remove the strain relief clip from the sensing lead and disconnect the lead 2 Undo the screws securing...

Page 35: ...n Examine and replace the gasket if necessary 6 Remove the four nuts and separate the fan from the gas air inlet Note the position of the orifice plate and examine the gasket replacing if necessary Fig 58 7 Fit the new fan ensuring that the orifice plate is correctly fitted and that the gasket is in position 8 Examine the insulation around the burner and the heat exchanger gasket and replace if ne...

Page 36: ...t the new burner and gasket examine the insulation and heat exchanger gasket replacing if necessary 7 Reassemble in reverse order 13 6 Insulation 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...

Page 37: ...nsor Fig 62 1 Drain the boiler primary circuit 2 Disconnect the plug from the sensor 3 Unscrew the sensor from the hydraulic outlet assembly examine the sealing washer and replace if necessary 4 Reassemble in reverse order ensuring that the plug is pushed fully onto the new sensor 13 10 DHW Temperature Sensor NTC Fig 62 1 Turn off the mains cold water supply tap and draw off the residual domestic ...

Page 38: ...raw the head away 3 Reassemble in reverse order 13 13 Pump Complete Fig 65 1 Drain the boiler primary circuit and disconnect the electrical plug from the pump motor 2 Undo the two screws securing the body to the pipe and manifold and draw the pump forwards 3 Unscrew the automatic air vent from the pump body 4 Examine the O ring seals on the return pipe and manifold replacing if necessary 6 Fit the...

Page 39: ...he 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 14 17 Pressure Relief Valve Fig 69 1 Drain the boiler primary circuit 2 Disconnect the discharge pipe from the valve Using a suitable hexagon key undo the grub screw sufficiently to release the valve 3 Note the orientation of the valve rotate it a...

Page 40: ...t hand location stud is offset towards the centre more than the right hand one 7 Reassemble in reverse order 13 19 Diverter Valve Motor Unit Assembly Fig 71 1 To replace the motor unit disconnect the multi pin plug 2 Pull off the retaining clip and remove the motor unit 3 The motor unit can now be replaced or the valve assembly removed 4 Drain the primary circuit and draw off any hot water once th...

Page 41: ...e order ensuring that the temperature controllers are reset to their previous positions 13 21 Pump P C B Figs 72 73 1 Completely undo the screws securing the control box cover and release the cover retaining barbs from their slots 2 Note the position of all plugs and wires on the P C B and disconnect them Undo the securing screws and remove the P C B 3 Reassemble in reverse order 13 22 Selector Sw...

Page 42: ... prior to final setting use a suitable hexagon key to wind out the Throttle Adjustment Screw until it is flush with the valve body then turn the screw 4 full turns clockwise Fig 75 If the boiler will not light or the correct CO2 cannot be achieved contact the heateam technical helpline 12 24 Expansion Vessel Fig 76 1 Drain the boiler primary circuit and undo the nut on the vessel connection pipe 2...

Page 43: ... the correct reading is obtained Fig 84 Turning clockwise will reduce the CO2 Anticlockwise will increase the CO2 9 The CO2 must then be checked at minimum rate Turn the CH temperature knob fully anticlockwise As the knob is turned the display will change indicating the fan speed When the display reads 0 the boiler runs at minimum rate The CO2 should be 8 4 0 0 0 4 10 With the boiler on minimum th...

Page 44: ...er Pressure Switch Spark Generator Ignition Electrode 9 8 7 6 5 4 3 2 1 9 10 8 7 6 5 4 3 2 1 Hall Effect Sensor r w b IntegralTimer where fitted 1 2 3 4 1 2 3 4 bk br bk b N L br br 1 4 2 5 3 1 2 a b bk bk bk grey gr gr gr X3 1 2 3 4 5 6 7 8 9 X1 1 2 GasValve Pump b br b br br b b br br b b br r bk r bk w r bk bk r w DiverterValve a b Link bk b g y br Mains Input Cable br b b br Pump PCB X1 X2 X3 ...

Page 45: ...30293 422 Gas Valve 720301001 404 Hall Effect Sensor 5114767 313 Burner 5130292 419 Water Pressure Switch 5114748 400 Plate Heat Exchanger 248048 415 Pump 7222703 421 NTC Sensor DHW 5114725 420 Overheat Thermostat 5114729 304 NTC Sensor CH 5130291 504 Pressure Gauge 248090 503 PCB 25 5131264 PCB 30 5131265 505 Pump PCB 7222704 313 426 326 422 404 419 400 415 503 504 320 304 421 420 505 ...

Page 46: ...preceded by the letter E For example code E133 will be displayed by E1 alternating with 33 E50 is shown as E then 50 E20 E28 E50 indicate faulty or incorrect components E110 shows overheat of the primary water E119 is displayed when the primary water pressure is less than 0 5 bar E133 indicates that the gas supply has been interrupted ignition has failed or the flame has not been detected E125 is ...

Page 47: ...ng Go to section D Error 133 flashing Burner does not stay alights after 5 seconds Error 133 flashing Go to section I Operation sequence successful If the error 110 is still flashing Go to section J Fan runs at correct speed YES YES NO NO NO YES YES YES YES YES YES YES YES NO YES YES YES YES NO NO NO NO NO Burner output modulates to maintain the temperature set Burner goes out Go to section C Ensu...

Page 48: ...hts after 5 seconds Error 133 flashing Go to section I Operation sequence successful Turn the selector switch to reset position for 5 seconds If the error 110 is still flashing Go to section J Fan runs at correct speed YES YES NO NO NO YES YES YES YES YES YES YES YES NO YES YES YES YES NO NO NO NO NO Burner output modulates to maintain the temperature set DHW flow sensor senses no flow Burner goes...

Page 49: ...t is opened Open the automatic air vent 2 NO C 1 NO YES Fan connections correct at fan PCB X2 connector is 230V AC across terminals 5 7 Fan jammed or faulty winding Replace PCB Replace fan YES D NO Replace water pressure switch Check connection water pressure switch terminal COM NO and PCB connector X400 terminals 3 4 YES Is there 230V at X3 Connection Pump PCB 1 NO YES B Check incoming wiring X2 ...

Page 50: ...Check and correct if necessary 1 Ignition electrode and lead 2 Electrode connection 3 Spark gap and position voltage at PCB X2 connector is 110V AC across terminals 2 5 Note from multimeter connect common to 2 volts to 5 Check wiring YES NO Replace igniter YES H YES 1 Ensure that the Hall Effect Sensor is in position Check the connection between the PCB X400 connector terminals 3 6 7 and the elect...

Page 51: ...inals Allow to cool Continuity across thermostat terminals more than 1 5 ohm J L M Is there 230V at Motor 3 way valve Replace motor 3 way valve 1 YES PCB X3 connector terminals 5 6 central heating mode 5 7 domestic hot water mode Replace PCB 2 NO Change pump supply cable YES Fan connections correct at fan PCB X401 connector terminals 5 6 7 8 1 YES Replace fan Temperature sensors faulty Cold resist...

Page 52: ...52 Baxi Heating UK Ltd 2015 18 0 Notes ...

Page 53: ...53 Baxi Heating UK Ltd 2015 18 0 Notes ...

Page 54: ...equired Thermostatic radiator valves Fitted Not required Automatic bypass to system Fitted Not required Boiler interlock Provided ALL SYSTEMS s instructions Yes What system cleaner was used What inhibitor was used Quantity litres Yes No CENTRAL HEATING MODE measure and record Gas rate m hr OR ft hr Burner operating pressure if applicable mbar OR Gas inlet pressure mbar C Central heating return tem...

Page 55: ...e Company name Telephone No Gas safe register No Record At max rate CO ppm AND CO At min rate Where Possible CO ppm AND CO Comments Signature SERVICE 06 Date Engineer name Company name Telephone No Gas safe register No Record At max rate CO ppm AND CO At min rate Where Possible CO ppm AND CO Comments Signature SERVICE 07 Date Engineer name Company name Telephone No Gas safe register No Record At m...

Page 56: ...erms and conditions visit www baxi co uk terms Failure to adhere to terms and conditions will void your manufacturer s warranty Baxi Brooks House Coventry Road Warwick CV34 4LL Please ensure the boiler is installed in accordance with these installation instructions and that you adhere to the Building Regulations e oe All descriptions and illustrations provided in this document have been carefully ...

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