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Baxi Combi 105 HE Installation & Servicing Instructions Manual

Gas fired wall mounted condensing combination boiler
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See also: Instructions for Installation and Servicing
Installation & Servicing Instructions
Baxi Combi 105 HE
Gas Fired Wall Mounted
Condensing Combination Boiler
These instructions include the Benchmark Commissioning Checklist and should be
left with the User for safe keeping.
© Baxi Heating UK Limited 2005

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Summary of Contents for Baxi Combi 105 HE

  • Page 1 Installation & Servicing Instructions Baxi Combi 105 HE Gas Fired Wall Mounted Condensing Combination Boiler These instructions include the Benchmark Commissioning Checklist and should be left with the User for safe keeping. © Baxi Heating UK Limited 2005...

  • Page 2: Table Of Contents

    Its aim is to improve the standards of installation and commissioning of central heating © Baxi Heating UK Limited 2005 All rights reserved. No part of this publication systems in the UK and to encourage the regular servicing of all...
  • Page 3 User’s Operating Instructions Baxi Combi 105 HE Gas Fired Wall Mounted Condensing Combination Boiler Please keep these instructions safe. Should you move house, please hand © Baxi Heating UK Limited 2005 them over to the next occupier.

  • Page 4: Natural Gas

    Service Interval Record at the back is completed at each service visit. © Baxi Heating UK Limited 2005 All rights reserved. No part of this publication The boiler meets the requirements of Statutory Instrument “ The...
  • Page 5 Legislation IMPORTANT - Installation, Commissioning, Service & Repair Baxi 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 6 Electricity Supply 1. THIS APPLIANCE MUST BE EARTHED. 2. A standard 230V ~ 50Hz supply is required. The appliance must be protected by a 3 amp fuse. Never Hang Flammable Items Over The Appliance © Baxi Heating UK Limited 2005...
  • Page 7 2.0 Introduction Introduction 1. Your Baxi Combi 105 HE is a gas fired, room sealed, powered flue condensing combination boiler, providing central heating for your home and mains fed domestic hot water to taps and shower. It is fully automatic and does not have a pilot light. Boiler frost protection and pump protection are integral features of the appliance.
  • Page 8 Position (i) or On/Off/Reset Position (ii). Selector Switch Reset Reset OFF Position Position (i) (Central Heating or Hot Water) Fig. 6 Fig. 7 Reset Position (ii) Fig. 8 (Hot Water) © Baxi Heating UK Limited 2005...
  • Page 9 Fig. 11 Safety Thermostats 1. Your Baxi Combi 105 HE is fitted with additional safety devices, which shut down the boiler in the event of the system, the boiler or the flue overheating. The...
  • Page 10 1. With the selector switch in either Position (i) or Position (ii) (Figs. 13 & 14) the pump will automatically Fig. 13 operate for 1 minute in every 24 hours to prevent sticking. Reset Fig. 14 © Baxi Heating UK Limited 2005...
  • Page 11 2. If the system temperature falls below 5°C, then the OFF Position boiler will fire until the water temperature has been raised. 3. Further frost protection can be incorporated by using a frost thermostat to protect the whole system. © Baxi Heating UK Limited 2005...
  • Page 12 Is the time clock (if fitted) calling for central heating ? i) Is the room thermostat (if fitted) set high enough ? In Operation Fig. 21 j) Are the radiator valves open ? © Baxi Heating UK Limited 2005...
  • Page 13 2. In the unlikely event of a breakdown our Contact your installer Baxi Heating UK Limited trained heating experts will quickly get your heating and hot water working again. If your boiler is out of its free 12 month warranty period, heateam can provide a competitive fixed price repair rate including parts, labour and VAT.
  • Page 14 Baxi Please complete the boxes below Heating UK Limited providing a free warranty service within 12 months of installation of your boiler. If your installer is unable to Serial Number rectify your boiler fault, by contacting one of our friendly advisors we can arrange an engineer if required.
  • Page 15 CORGI is writen onto the Benchmark Checklist CORGI will record the data and LABC will record the data will send a certificate of and will issue a compliance to the property certificate of compliance © Baxi Heating UK Limited 2005...

  • Page 16: Legislation

    Legislation IMPORTANT - Installation, Commissioning, Service & Repair Baxi 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 17: Introduction

    1.0 Introduction Description Case Front Panel 1. The Baxi Combi 105 HE 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.

  • Page 18: General Layout

    Fault on Central Heating Sensor Power On Domestic Hot Water Mode Central Heating Mode Burner On When neons 24 to 29 are constantly illuminated, they indicate the temperature of the central heating water. Reset © Baxi Heating UK Limited 2005...

  • Page 19: Appliance Operation

    1. With the selector switch (see Section 2.1) in either the central heating or central heating and domestic hot water position the pump will automatically operate for 1 minute in every 24 hours to prevent sticking. Fig. 3 © Baxi Heating UK Limited 2005...

  • Page 20: Technical Data

    Internal Fuse Rating Fuse 2A Fast Blow to BS 4265 Pump - Available Head SEDBUK Declaration For Combi 105 HE The seasonal efficiency (SEDBUK) is 87.3% (89.4% LPG) Band B This value is used in the UK Government’s Standard Assessment Procedure (SAP) for energy rating of dwellings.

  • Page 21: Dimensions And Fixings

    28mm Condensate Drain 65 mm 65 mm 65 mm 65 mm 65 mm Heating Heating Domestic Hot Cold Water Pressure Relief Return Valve Flow Water Outlet Inlet Inlet (22mm) (22mm) (15mm) (22mm) (15mm) (15mm) © Baxi Heating UK Limited 2005...

  • Page 22: System Details

    6.0 System Details Information 1. The Baxi Combi 105 HE Condensing Combination Boiler is ‘Water Byelaws Scheme - Approved Products’. 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 23 3. The discharge must not be above a window, entrance or other public access. Consideration must be given to the possibility that boiling water/steam could discharge from the pipe. © Baxi Heating UK Limited 2005...
  • Page 24 1. If the area of the installation is recognised as a HARD WATER AREA then a suitable device should be fitted to treat the mains water supply to the boiler. Contact your Water Distribution Company for advice on suitable devices. © Baxi Heating UK Limited 2005...

  • Page 25: Site Requirements

    For Servicing Purposes heat exchanger. This should be considered when siting the appliance and in the event of any subsequent alteration in the area of installation. 5mm Min In Operation Fig. 9 © Baxi Heating UK Limited 2005...
  • Page 26 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. Fig. 10 Gas Service Cock © Baxi Heating UK Limited 2005...
  • Page 27 & vent pipe ii) via an internal discharge branch (e.g. sink waste) iii) to a drain or gully iv) to a purpose made soakaway Holes in the soak-away must face away from the building © Baxi Heating UK Limited 2005...
  • Page 28 * In addition, the terminal should be no nearer than 150mm to an opening in the building fabric formed for the purpose of accommodating a built-in element such as a window frame. See BS 5440 Pt. 1. © Baxi Heating UK Limited 2005...
  • Page 29 3. When ordering a terminal guard, quote the appliance name and model number. 4. The flue terminal guard should be positioned centrally over the terminal and fixed as illustrated. Fig. 14 © Baxi Heating UK Limited 2005...

  • Page 30: Baxi Combi 105 He G.c.n

    7.0 Site Requirements 7.11 Flue Options 1. The Baxi Combi 105 HE can be fitted with flue systems as illustrated. 2. The standard flue is suitable only for horizontal applications. 3. Maximum permissible equivalent flue lengths are:- Horizontal Concentric Vertical Concentric Vertical Twin Pipe 4.

  • Page 31: Installation

    2. Stand the boiler on its base by using the rear lower edge as a pivot. NOTE: A small amount of water may drain from the boiler in the upright position. Fig. 17 Central Heating Return © Baxi Heating UK Limited 2005...
  • Page 32 21.5mm ( in) plastic overflow Fig. 19 pipe which should generally discharge internally into the household drainage system. If this is not possible, discharge into an outside drain is acceptable. Discharge Pipe © Baxi Heating UK Limited 2005...
  • Page 33 This dimension will be known as ‘X’ (Fig. 22). 4. To dimension ‘X’ add 50mm. This dimension to be Wall Thickness known as ‘Y’. IMPORTANT: Check all dimensions before cutting. Flue Elbow Adaptor Fig. 21 Wall Thickness Fig. 22 © Baxi Heating UK Limited 2005...
  • Page 34 11. Fit the flue trim if required, and if necessary fit a terminal guard (see Section 7.9 & 7.10). VERTICAL FLUE 1. Only a flue approved with the Baxi Combi 105 HE can be used. 2. For information on vertical flues consult the Baxi Flue Guide brochure.
  • Page 35 - black Flame Sensing Electrode and include checks for Ground Continuity, r - red Hydraulic Differential Pressure Switch g - green Resistance to Ground, Short Circuit and Polarity. DHW Flow Priority Microswitch Fig. 30 © Baxi Heating UK Limited 2005...

  • Page 36: Commissioning The Boiler

    OFF position and then Selector Switch back to either ( ) or ( ) (Fig. 33). Pressure Gauge Fig. 32 Reset Power On Neon Central Heating Hot Water Temperature Control Temperature Control Fig. 33 © Baxi Heating UK Limited 2005...
  • Page 37 14. Once the pressure has been set turn the boiler off Fig. 37 and disconnect the pressure gauge. 15. Tighten the pressure test screw and refit the modulator to the valve. Reassemble in reverse order. © Baxi Heating UK Limited 2005...

  • Page 38: Completion

    I.S. 813 “Domestic Gas Installations”. This is in addition to the Benchmark Commissioning Checklist. 5. Hand over the Users Operating, Installation and Servicing Instructions, giving advice on the necessity of regular servicing. Facia Panel Fig. 38 © Baxi Heating UK Limited 2005...

  • Page 39: Servicing The Boiler

    10. Remove the four screws securing the combustion Sensing box door and remove the door (Fig. 40). Tubes Ease Fan Spigot Outlet Pipe Clamps Inwards Fig. 41 Fan Spigot Outlet Pipe Combustion Box Door Fig. 40 Inner Door Panel © Baxi Heating UK Limited 2005...
  • Page 40 26. Complete the relevant Service Interval Record section of the Benchmark Commissioning Checklist at the rear of this publication and then hand it back to the user. Inlet/Return Manifold © Baxi Heating UK Limited 2005...

  • Page 41: Changing Components

    3. Remove the two screws holding the pressure switch to the bracket on the combustion box top panel. 4. Fit the new pressure switch and reassemble all components in reverse order of dismantling. Fan Hood Fig. 49 Spring Washer Securing Screw © Baxi Heating UK Limited 2005...
  • Page 42 Fit the electrodes to the new burner. 5. Engage the burner location brackets over the studs on the injector manifold and reassemble in reverse order. Burner Electrodes Electrode Grommets Fig. 51 Electrode Leads © Baxi Heating UK Limited 2005...
  • Page 43 4. The combustion box door insulation piece can be Rear Insulation replaced by carefully bending up the two retaining tabs. 5. Replace all insulation pieces and reassemble in reverse order. 13.8 Side Insulation Combustion Box Door Front Insulation Fig. 53 © Baxi Heating UK Limited 2005...
  • Page 44 3. Unscrew the sensor from the plate heat exchanger Plate Heat manifold. Examine the sealing washer,replacing if Exchanger necessary. 4. Reassemble in reverse order. The plug will only fit one way. Fig. 56 DHW Temperature Sensor © Baxi Heating UK Limited 2005...
  • Page 45 Pump Setting Automatic Air 2. Examine the ‘O’ ring seal, replacing if necessary, and Vent Fig. 58 fit it to the new automatic air vent. 3. Reassemble in reverse order. Pump Wiring Cover Fig. 59 © Baxi Heating UK Limited 2005...
  • Page 46 4. From underneath the boiler remove the screws securing the trap bracket. Bracket 5. Remove the trap and bracket from the boiler. Undo the locknut securing the trap to the bracket. Fig. 63 Condensate 6. Reassemble in reverse order. Drain Pipe © Baxi Heating UK Limited 2005...
  • Page 47 4. Remove the screws securing the switch to the facia panel. 5. Fit the new switch, ensuring that it is correctly Facia positioned and reassemble in reverse order. Selector Switch Knob Fig. 66 Temperature Control Knobs © Baxi Heating UK Limited 2005...
  • Page 48 6. Remove the plastic disc and pushrod assembly. Plastic Disc Carefully examine the diaphragm and replace it if there is any damage. Pushrod 7. Reassemble in reverse order. Fig. 69 © Baxi Heating UK Limited 2005...
  • Page 49 2. Unscrew the venturi and remove the flow regulator. Flow Fig. 72 3. Check the cleanliness of the filter gauze, rinsing Regulator thoroughly in clean water as necessary. Fit the new Venturi flow regulator and reassemble in reverse order. Inlet/Return Manifold © Baxi Heating UK Limited 2005...
  • Page 50 Unscrew the thermostat from the adaptor in the outlet elbow. 3. Reassemble in reverse order of dismantling. Ease Fan Spigot Outlet Pipe Clamps Inwards Fig. 74 Fan Spigot Outlet Pipe Overheat Thermostat © Baxi Heating UK Limited 2005...

  • Page 51: Illustrated Wiring Diagram

    Electrode Mains Input Link Fuse Overheat Stat Flue Stat Gas Valve Condensate Trap - brown - black - blue Reset Selector Switch Optional Timers - red - green - green / yellow - white © Baxi Heating UK Limited 2005...

  • Page 52: Fault Finding

    Burner extinguishes neon flashing after 10 seconds Go to sections ‘I’ & ’L’ Burner output Go to section ‘G’ modulates until set temperature is reached Operation sequence correct Burner goes out Fan stops Pump stops © Baxi Heating UK Limited 2005...
  • Page 53 Close DHW tap ‘G’ DHW flow valve senses no flow. Diverter valve spindle Primary water diverted to assembly faulty CH system. DHW flow switch released off Burner goes out Fan stops Pump stops Operation sequence correct © Baxi Heating UK Limited 2005...
  • Page 54 Cold resistance approx. 11K ohms (resistance reduces with increase in temp.) Fan connections correct at fan. PCB - A2 connector, is 230V Fan jammed or faulty winding Replace fan across terminals 5 & 7 Replace PCB © Baxi Heating UK Limited 2005...
  • Page 55 230V at Main PCB - A1 1. Ignition electrode and lead connector across terminals 2. Electrode connection Replace gas valve 3 & 4. Check wiring 3. Spark gap and position electrical plug & igniter assembly © Baxi Heating UK Limited 2005...
  • Page 56 Press the reset button on the flue overheat thermostat. If the boiler does not relight or repeatedly cuts out. Check the operation of the flue system or replace the flue overheat thermostat © Baxi Heating UK Limited 2005...

  • Page 57: Short Parts List

    248042 E66 432 3-Way Valve Assy. 248061 342 571 Temperature Sensor 247394 E66 439 Safety Thermostat 248079 Gas Valve 5107339 5112380 E66 453 Pressure Gauge 248090 Igniter/Gas Valve Cable 5112385 Flue Overheat Thermostat 5112395 © Baxi Heating UK Limited 2005...

  • Page 58: Benchmark Checklist

    CO/CO RATIO THE OPERATION OF THE APPLIANCE AND SYSTEM CONTROLS HAVE BEEN DEMONSTRATED TO THE CUSTOMER THE MANUFACTURER’S LITERATURE HAS BEEN LEFT WITH THE CUSTOMER COMMISSIONING ENG’S NAME PRINT CORGI ID No. SIGN DATE © Baxi Heating UK Limited 2005...

  • Page 59: Service Interval Record

    SIGNATURE SIGNATURE SERVICE 9 SERVICE 10 DATE DATE ENGINEER NAME ENGINEER NAME COMPANY NAME COMPANY NAME TEL No. TEL No. CORGI ID CARD SERIAL No. CORGI ID CARD SERIAL No. COMMENTS COMMENTS SIGNATURE SIGNATURE © Baxi Heating UK Limited 2005...
  • Page 60 B axi H e ati ng UK Li m it e d Brownedge Road Bamber Bridge Preston Lancashire PR5 6UP After Sales Service 08706 096 096 Technical Enquiries 08706 049 049 Website www.baxi.co.uk ompany Comp N 5111809 - Iss 3 - 01/06 © Baxi Heating UK Limited 2005...

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