Baxi Main Combi 24 HE Installation And Service Instructions Manual
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Baxi Main Combi 24 HE Installation And Service Instructions Manual

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Combi 24 HE
Installation & Service Instructions
These instructions include the Benchmark Commissioning Checklist
and should be left with the user for safe keeping.
© Baxi Heating UK Ltd 2011

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Summary of Contents for Baxi Main Combi 24 HE

  • Page 1 Combi 24 HE Installation & Service Instructions These instructions include the Benchmark Commissioning Checklist and should be left with the user for safe keeping. © Baxi Heating UK Ltd 2011...

  • Page 2: Table Of Contents

    Building Regulations. © Baxi Heating UK Ltd 2011 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 nature (including in any database), in each case whether...

  • Page 3: Installer Notification Guidelines

    Benchmark Checklist ‘Gas Safe Register’ will issue a LABC will record the data Building Regulations Compliance and will issue a Certificate to the property owner certificate of compliance and inform the relevant LABC © Baxi Heating UK Ltd 2011...

  • Page 4: Legislation

    Product/Production certified by: heating systems. Notified Body 0086. BS 7074 Expansion vessels and ancillary equipment for sealed water systems. BS 7593 Treatment of water in domestic hot water For GB/IE only. central heating systems. © Baxi Heating UK Ltd 2011...
  • Page 5 If at any time when installing the boiler you feel that you may have injured yourself STOP !! DO NOT ‘work through’ the pain - you may cause further injury. IF IN ANY DOUBT DO NOT HANDLE OR LIFT THE BOILER - OBTAIN ADVICE OR ASSISTANCE BEFORE PROCEEDING !! © Baxi Heating UK Ltd 2011...

  • Page 6: Introduction

    1.0 Introduction Description Case Front Panel 1. The Main Combi 24 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 7: General Layout

    Secondary Heat Exchanger On/Off/Reset Selector Switch Burner & Fault Indicator Neon Power Neon Flame Failure & Fault Indicator Neon Central Heating Temperature Control Hot Water Temperature Control Reset Burner On Flame Failure Power On © Baxi Heating UK Ltd 2011...

  • Page 8: Appliance Operation

    ‘0’ (Off) position the electrical supply to the boiler is isolated. The boiler will not operate and the integral timer (if fitted) will require resetting once the selector switch is turned to either the DHW or CH position. Fig. 3 © Baxi Heating UK Ltd 2011...

  • Page 9: Technical Data

    Pump - Available Head LPG Propane - G31 Burner Injector 15 x 0.77mm diameter Burner Pressure Max Rate Min Rate Propane mbar 21.8 ± 0.5 4.4 ± 0.2 Inlet Pressures mbar 1000 1200 Flow Rate (l/h) © Baxi Heating UK Ltd 2011...

  • Page 10: 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 Flow Water Outlet Inlet Inlet Valve (22mm) (15mm) (22mm) (15mm) (22mm) (15mm) © Baxi Heating UK Ltd 2011...

  • Page 11: System Details

    6.0 System Details Information 1. The Main Combi 24 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 12 4. A remote relief valve kit is available to enable the boiler to be installed in cellars or similar locations below outside ground level (kit no. 5121379). © Baxi Heating UK Ltd 2011...
  • Page 13 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 Ltd 2011...

  • Page 14: 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 Ltd 2011...
  • Page 15 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 Ltd 2011...
  • Page 16 & vent pipe ii) via an internal discharge branch (e.g. sink waste) 500mm min 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 Ltd 2011...
  • Page 17 (see Top View Rear Flue Section 9.0). Fig. 12 Property Boundary Line Air Inlet Opening Window or Door 150mm Fig. 12a MIN. Likely flue positions requiring Fig. 11 a flue terminal guard © Baxi Heating UK Ltd 2011...

  • Page 18: Flue Options

    NOTE: Horizontal flue pipes should always be installed with a 1.5° fall from the terminal to allow condensate to run back to the boiler. This bend is equivalent to 1 metre This bend is equivalent to 1 metre Total equivalent length (up to 3m) = A+B+C+2x90°Bends © Baxi Heating UK Ltd 2011...
  • Page 19 This bend is equivalent to 1 metre Equivalent Length Air Duct = 6.5m FLUE DUCT Equivalent Sub total Length Value fittings/pipes 1m extension 5.0m 45°bend 0.25m 0.5m 91.5°bend 1.0m 0.5m Equivalent Length Flue Duct = 6.5m © Baxi Heating UK Ltd 2011...
  • Page 20 80mm 5111081 FLUE GROUP A, N, G Vertical Flue Kits Vertical Flue Terminal 5111078 (use with 5111070) Vertical Flue Terminal 5118576 Pitched Roof Flashing 25°/50° 5122151 Roof Cover Plate 246143 Flat Roof Flashing 246144 © Baxi Heating UK Ltd 2011...
  • Page 21 5. Using the screws previously removed secure the inlet adaptor to the top panel. 6. Continue to fit the twin flue system. Position of Restrictor Air Duct Adaptor Gasket Restrictor Gasket © Baxi Heating UK Ltd 2011...
  • Page 22 1. If required a flue deflector is available from your Main stockist. 2. Push the flue deflector over the terminal end and rotate to the Fig. 14 optimum angle for deflecting plume. Secure the deflector to the terminal with screws provided. © Baxi Heating UK Ltd 2011...

  • Page 23: Plume Displacement

    Installation & Servicing Instructions and BS5440 Pt. 1. It is NOT necessary to fit a terminal guard over the air inlet or the plume outlet. © Baxi Heating UK Ltd 2011...
  • Page 24 0.5 Additional Accessories metres long. A - 93° Elbow 5121369 B - 45° Elbow (Pair) 5121370 Fig. 18 C - 1 metre 60Ø Extension 5121368 © Baxi Heating UK Ltd 2011...
  • Page 25 14. Fit the 93° elbow/plume outlet and secure with the two remaining screws supplied. Ensure the plume outlet is at least 45° to the wall and that the ‘peak’ is uppermost Fig. 24 (Fig. 24). © Baxi Heating UK Ltd 2011...
  • Page 26 25. All other minimum & maximum dimensions must be adhered to, and the air inlet positioned such that it will not be subject to rain entry. Fig. 28 70° Concentric Flue Length (shown end-on) Outlet Spigot Fig. 29 © Baxi Heating UK Ltd 2011...

  • Page 27: 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. 31 Central Heating Return © Baxi Heating UK Ltd 2011...
  • Page 28 5. Complete the discharge pipework and route it to the outside discharge point. IMPORTANT: Make all soldered joints before connecting to the safety pressure relief valve. Pressure Relief Valve Fig. 33 Discharge Pipe © Baxi Heating UK Ltd 2011...
  • Page 29 This dimension will be known as ‘X’ (Fig. 36). 4. To dimension ‘X’ add 50mm. This dimension to be known as ‘Y’. IMPORTANT: Check all dimensions before cutting. Fig. 35 Wall Thickness Fig. 36 © Baxi Heating UK Ltd 2011...
  • Page 30 Fig. 38 11. Fit the flue trim if required, and if necessary fit a terminal guard (see Section 8.8 & 8.9). VERTICAL FLUE 1. Only a flue approved with the Main Combi 24 HE can be used. Flue Elbow Fig. 39...
  • Page 31 - black Flame Sensing Electrode and include checks for Ground Continuity, r - red g - green Resistance to Ground, Short Circuit and Polarity. Hydraulic Differential Pressure Switch DHW Flow Priority Microswitch Fig. 44 © Baxi Heating UK Ltd 2011...

  • Page 32: Commissioning The Boiler

    Power On period, turn the selector to the OFF position and then back to either ( ) or ( ) (Fig. 47). Power On Neon Hot Water Central Heating Temperature Control Temperature Control Fig. 47 © Baxi Heating UK Ltd 2011...
  • Page 33 Fig. 51 14. Once the pressure has been set turn the boiler off 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 Ltd 2011...

  • Page 34: 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. 52 © Baxi Heating UK Ltd 2011...

  • Page 35: Servicing The Boiler

    9. Remove the four screws securing the combustion box door and remove the door (Fig. 54). Sensing Tube Ease Outlet Pipe Clamp To The Left Fig. 55 Combustion Box Door Fig. 54 Inner Door Panel © Baxi Heating UK Ltd 2011...
  • Page 36 25. 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 Ltd 2011...

  • Page 37: 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. 63 Spring Washer Securing Screw © Baxi Heating UK Ltd 2011...
  • Page 38 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. 65 Electrode Leads © Baxi Heating UK Ltd 2011...
  • Page 39 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. 67 © Baxi Heating UK Ltd 2011...
  • Page 40 2. Remove the screws securing the thermostat to the mounting plate on the flow pipe. Temperature 3. Reassemble in reverse order. The thermostat is not Sensor polarised - either wire can fit either terminal on the thermostat. Fig. 69 © Baxi Heating UK Ltd 2011...
  • Page 41 Pump Setting Automatic Air 2. Examine the ‘O’ ring seal, replacing if necessary, and Vent Fig. 72 fit it to the new automatic air vent. 3. Reassemble in reverse order. Pump Wiring Cover Fig. 73 © Baxi Heating UK Ltd 2011...
  • Page 42 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. 77 Condensate 6. Reassemble in reverse order. Drain Pipe © Baxi Heating UK Ltd 2011...
  • Page 43 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. Fig. 80 Selector Switch Knob Temperature Control Knobs © Baxi Heating UK Ltd 2011...

  • Page 44: Diverter Valve Assembly

    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. 83 © Baxi Heating UK Ltd 2011...

  • Page 45: Flow Regulator

    2. Unscrew the venturi and remove the flow regulator. Flow Fig. 86 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 Ltd 2011...
  • Page 46 2. Pull the two wires off the terminals on the flue overheat thermostat. Unscrew the thermostat from the adaptor in the outlet elbow. 3. Reassemble in reverse order of dismantling. Fig. 88 Flue Overheat Thermostat © Baxi Heating UK Ltd 2011...

  • Page 47: Illustrated Wiring Diagram

    3-Way Valve Microswitch Switch Flame Sensing Electrode Condensate Trap br - brown bk - black b - blue - red y - yellow g/y - green / yellow w - white gr - grey © Baxi Heating UK Ltd 2011...

  • Page 48: Fault Finding

    Go to section ‘F’ illuminated Burner extinguishes Go to section ‘I’ after 10 seconds 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 Ltd 2011...
  • Page 49 Close DHW tap DHW flow valve senses no flow. Diverter valve spindle Primary water diverted to assembly faulty CH system. DHW flow switch released off Operation sequence correct Burner goes out Fan stops Pump stops © Baxi Heating UK Ltd 2011...

  • Page 50: Fault Finding Solutions

    Gas at burner Ensure gas is on and purged PCB - M4 connector is approx 230V AC, terminals Replace gas valve 36 & 38 Turn selector switch to neon illuminated ‘Reset’ position Replace PCB © Baxi Heating UK Ltd 2011...
  • Page 51 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. If the flue overheat thermostat has not been activated see section ‘D’ © Baxi Heating UK Ltd 2011...

  • Page 52: Fault Indication Display

    2 seconds. If the boiler does not relight after resetting, blockage of the Flame Failure condensate drain or trap has occurred. Power On Burner On Flame Failure Power On © Baxi Heating UK Ltd 2011...

  • Page 53: Short Parts List

    Valve - 3 Way Assy. 248062 343 619 Pressure Differential Assy. 248063 Temperature Sensor 5108265 E66 697 Safety Limit Thermostat 248078 Gas Valve 5107339 5112657 E66 453 Pressure Gauge 248090 Igniter/Gas Valve Cable 5112385 Flue Overheat Thermostat 5112395 © Baxi Heating UK Ltd 2011...

  • Page 54: Benchmark Checklist

    Failure to install and commission according to the manufacturer’s instructions and complete this Benchmark Commissioning Checklist will invalidate the warranty. This does not affect the customer’s statutory rights. If yes, and if required by the manufacturer, has a water scale reducer been fitted? CONDENSING BOILERS ONLY The condensate drain has been installed in accordance with the manufacturer’s instructions and/or BS5546/BS6798 If the condensate pipe terminates externally has the pipe diameter been increased and weatherproof insulation fitted?

  • 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.
  • Page 56 A T r a d i n g D i vi s i o n of Bax i H e at in g UK L td ( 38 79 15 6) Brooks House, Coventry Road, Warwick. CV34 4LL After Sales Service 0844 871 1570 Technical Enquiries 0844 871 1555 Website www.mainheating.co.uk e&oe Comp N 5115809 - Iss 11 - 2/11 © Baxi Heating UK Ltd 2011...

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