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Baxi Potterton Condensing Combination Boiler 14.6 Burner (Fig. 81) , 14.7 Insulation (Fig. 82)

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14.0 Changing Components

© Baxi Heating UK Ltd 2012

Fig. 81

Cover

Burner

Gasket

Extension Piece

(not on 33 models)

Collector

Venturi

Heat

Exchanger

Rear

Insulation

Cover

Insulation

Seal

Collector

Spark

Electrode

Sensing

Electrode

Electrode

Leads

Venturi

Fig. 82

14.6 Burner (Fig. 81)

1. Undo the screws securing the collector to the cover and

venturi. On 24/28 models there is an extension piece fitted

to the cover - remove this also.

2. Withdraw the burner from the cover and replace with

the new one.

3. Examine the gasket, replacing if necessary.

4. Reassemble in reverse order.

14.7 Insulation (Fig. 82)

1. Remove the electrode leads, noting their positions. Also

remove the electrodes as described in section 14.2.

2. Undo the screws securing the collector to the venturi and

the nuts holding the cover to the heat exchanger. Draw the

collector and cover assembly away.

3. Remove the cover insulation piece.

4. Fit the new insulation carefully over the burner and align

it with the slots for the electrodes.

5. The rear insulation is retained by a screw and large

washer, remove these and draw the insulation out of the

heat exchanger.

6. Examine the cover seal and replace if necessary.

Contents

Main 2 Natural Gas ISO 9001 FM 00866 Building Regulations and the Benchmark Commissioning Checklist Installer Notification Guidelines Legislation Codes of Practice - refer to the most recent version IMPORTANT - Installation, Commissioning, Service & Repair Safe Manual Handling CONTENTS 1.0 Introduction 1.1 Description 1.2 Optional Extras 1.3 Contents of Pack 2.0 General Layout 2.1 Layout 3.0 Appliance Operation 3.1 Central Heating Mode (Fig. 2) 3.2 Domestic Hot Water Mode (Fig. 3) 3.3 Frost Protection Mode 3.4 Pump Protection 4.0 Technical Data 4.1 Heatmax Combi 24, 28 & 33 Pump - Available Head SAP 2005 Seasonal Efficiency for all models is 91.1% SEDBUKDeclaration 5.0 Dimensions and Fixings Dimensions 6.1 Information 6.2 Central Heating Circuit 6.3 Bypass 6.4 System Control 6.5 System Filling and Pressurising 6.6 Expansion Vessel (Central Heating only) 6.7 Safety Pressure Relief Valve (Fig. 6) 6.8 Domestic Hot Water Circuit (Fig. 7) 6.9 Showers 6.10 Hard Water Areas 7.1 Location 7.2 Clearances (Figs. 8 & 9) 7.0 Site Requirement 7.3 Ventilation of Compartments 7.4 Gas Supply 7.5 Electrical Supply 7.6 Bath & Shower Rooms 7.7 Condensate Drain 7.7 Condensate Drain (cont.) 50mm per metre of pipe run 2.5 Minimum fall Page Page Horizontal Flues This bend is equivalent to 1 metre Total equivalent length = A+B+C+2x90Bends B AC This bend is equivalent to 1 metre 8.1 Horizontal Flue Systems Y C A X B 8.3 Flue Accessories 24 8.6 For Roof Terminals 8.7 Flue Dimensions 8.8 Flue Trim 8.9 Terminal Guard (Fig. 21) 9 .1 Plume Displacement Kit (Fig. 23) X Y 28/33 28/33 9.2 Determining Permissible Lengths 50mm 30mm 9.3 General Fitting Notes 9.3 General Fitting Notes (cont.) 30mm 70 10.1 Unpacking & Initial Preparation 10.2 Flushing 10.3 Fitting The Boiler 10.4 Fitting the Safety Pressure Relief Discharge Pipe (Fig. 44) 10.5 Condensate Drain (see section 7.7) 10.6 Fitting The Flue 10.6 Fitting the Flue (Cont) 10.7 Making The Electrical Connections 10.8 Preliminary Electrical Checks 11.0 Commissioning 11.1 Commissioning the Boiler x 2 Pressure 12.0 Completion 12.1 Completion 13.0 Servicing 13 .1 Annual Servicing 13.2 Annual Servicing - Inspection 13.0 Servicing 13.2 Annual Servicing - Inspection (Cont) 14.1 Igniter (Fig. 76) 14.2 Spark and Sensing Electrodes (Fig. 77) 14.3 Fan (Fig. 79) 14.4 Venturi (Fig. 78) 14.5 Injector (Fig. 78) 14.6 Burner (Fig. 81) 14.7 Insulation (Fig. 82) 14.8 Flue/Heat Exchanger Thermostat Sensor (Fig. 83) 14.9 Water Pressure Sensor (Fig. 85) 14.10 Central Heating Temperature Sensor (NTC) (Fig. 84) 14.11 Safety Thermostat (Fig. 85) 14.12 DHW Temperature Sensor (NTC) (Fig. 85) 14.14 Pump - Head Only (Fig. 87) 14.15 Pump - Complete (Fig. 88) 14.16 Automatic Air Vent (Fig. 89) 14.17 Pressure Gauge (Figs. 90 & 91) 14.18 Hall Effect Sensor (Fig. 92) 14.19 Safety Pressure Relief Valve (Fig. 93) 14.20 Plate Heat Exchanger (Fig. 94) 14.21 Diverter Valve - Motor Unit & Assembly (Fig. 95) 14.22 P.C.B. (Fig. 98) 14.23 Selector Switch (Fig. 98) 14.24 Gas Valve (Fig. 99) 14.25 Expansion Vessel (Fig. 101) 48 x 2 15.0 Setting the Gas Valve 15.1 Setting the Gas Valve (CO2check) 16.0 Electrical Baxi Heating UK Ltd 2012 16.1 Illustrated Wiring Diagram Mains Input Cable Link 17.0 Short Parts List 18.1 Initial Fault Finding Checks 18.2 Error Codes Page Page Fault Finding Solutions Sections A B D C E F H G I K J L M Page GAS BOILER SYSTEM COMMISSIONING CHECKLIST DOMESTIC HOT WATER MODE * CONTROLS ALL SYSTEMS CENTRAL HEATING MODE Service Record Service Provider Service 1 Service 2 Service 3 Service 4 Service 5 Service 6