Manuals / Brands / Household Appliance / Boiler / Baxi Potterton / Household Appliance / Boiler

Baxi Potterton Performa 24 Eco HE 44 , 14.20 Plate Heat Exchanger (Fig. 67), 14.21 Diverter Valve Assembly (Figs. 82 & 83)

1 56

Download 56 pages, 5.64 Mb

14.0 Changing Components

44 © Baxi Heating UK Ltd 2009

14.20 Plate Heat Exchanger (Fig. 67)

1. Drain the primary circuit.

2. While supporting the heat exchanger undo the

screws securing it to the brass manifolds.

3. Withdraw the heat exchanger upwards and to the

left of the gas valve, taking care not to damage any

wires or controls.

Seals

4. There are four rubber seals between the manifolds

and heat exchanger which may need replacement.

5. Ease the seals out of the manifold. Replace carefully,

ensuring that the seal is inserted into the manifold

parallel and pushed fully in.

6. When fitting the new heat exchanger note that the

left hand location stud is offset towards the centre

more than the right hand one.

7. Reassemble in reverse order.

14.21 Diverter Valve Assembly (Figs. 82 & 83)

The diverter valve assembly comprises of a central

heating pressure differential valve and a domestic hot

water pressure differential valve. These are connected

to a manifold which is joined to the plate heat

exchanger.

DHW Pressure Differential Valve (Fig. 83)

1. Drain the primary circuit.

2. Undo the screw securing the microswitch bracket to

the valve (Fig. 82).

3. Disconnect the two sensing pipes and slacken the

grub screws securing the valve to the diverter manifold.

4. Draw the valve away from the diverter manifold. The

valve may now be replaced or split to examine the

diaphragm.

5. To examine the diaphragm hold the valve body

securely and carefully remove the six screws. The

diaphragm spring will force apart the two halves of the

valve.

6. Remove the plastic disc and pushrod assembly.

Carefully examine the diaphragm and replace it if there

is any damage.

7. Reassemble in reverse order.

Plate Heat Exchanger

Rubber Seal

DHW Pressure

Differential Valve

Microswitch

Bracket

Grub Screws

Diverter Manifold

Sensing Pipes

Plastic Disc

Pushrod

Diaphragm

Spring

Diaphragm

Fig. 81

Fig. 82

Fig. 83

Contents

Main 2 Natural Gas Building Regulations and the Benchmark Commissioning Checklist Contents ISO 9001 FM 00866 Installer Notification Guidelines Legislation Codes of Practice, most recent version should be used IMPORTANT - Installation, Commissioning, Service & Repair Safe Manual Handling 1.1 Description 1.2 Contents of Pack 1.0 Introduction 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) 4.0 Technical Data Pump - Available Head 5.0 Dimensions and Fixings Dimensions 6.1 Information 6.2 Central Heating Circuit 6.3 Bypass 1. The boiler is fitted with an automatic integral bypass. 6.4 System Control 12 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 14 7.1 Location 7.2 Clearances (Figs. 8 & 9) 7.3 Ventilation of Compartments 7.4 Gas Supply 7.5 Electrical Supply 16 7.6 Condensate Drain Termination to an internal soil and vent pipe External termination via internal discharge branch e.g sink waste - downstream External termination to a drain or gully External termination to a purpose made soak-away Page 18 Horizontal Flues This bend is equivalent to 1 metre Total equivalent length (up to 3m) = A+B+C+2x90Bends B AC This bend is equivalent to 1 metre 8.1 Horizontal Flue Systems The total equivalent length for this example is = 6.5 metres. Y B A C 20 8.3 Flue Accessories 8.4 Flue Duct Adaptor 8.5 Air duct adaptor 22 8.6 For Roof Terminals 8.7 Flue Dimensions 8.8 Flue Trim 8.9 Terminal Guard (Fig. 14) 9.1 Plume Displacement Kit (Fig. 14b) 24 X Y 9.2 Determining Permissible Lengths 50mm 30mm 9.3 General Fitting Notes 26 9.3 General Fitting Notes (cont.) 30mm 70 10.1 Initial Preparation 10.2 Flushing 10.3 Preparing The Boiler 28 10.4 Fitting The Boiler 10.5 Fitting the Safety Pressure Relief Discharge Pipe (Fig. 33) 10.6 Condensate Drain (see section 7.6) 10.7 Fitting The Flue 30 10.7 Fitting the Flue (Cont) 10.8 Making The Electrical Connections 10.9 Preliminary Electrical Checks 11.0 Commissioning the Boiler 32 11.1 Commissioning the Boiler 11.0 Commissioning the Boiler 11.2 Checking the Burner Pressure 12.0 Completion 34 12.1 Completion 13.0 Servicing the Boiler 13 .1 Annual Servicing 13.0 Servicing the Boiler 36 13.1 Annual Servicing (Cont) 14.1 Fan (Figs. 62 & 63) 14.2 Pressure Switch (Fig. 61) 38 14.3 Heat Exchanger (Fig. 64) 14.4 Burner (Fig. 65) 14.5 Injectors (Fig. 66) 14.6 Electrodes (Fig. 66) 13.8 14.7 Insulation (Fig. 67) 40 14.8 Gas Valve (Fig. 68) 14.9 Temperature Sensor (Fig. 69) 14.10 Safety Thermostat (Fig. 69) 14.11 Pump - Head Only (Fig. 71) 14.12 Pump - Complete (Fig. 73) 14.13 Automatic Air Vent (Fig. 73) 42 14.14 Pressure Gauge (Figs. 74 & 75) 14.15 Expansion Vessel (Fig. 76) 14.16 Condensate Trap (Fig. 77) 14.17 Pressure Relief Valve (Fig. 78) 14.18 P.C.B. (Fig. 80) 14.19 Selector Switch (Fig. 80) 44 14.20 Plate Heat Exchanger (Fig. 67) 14.21 Diverter Valve Assembly (Figs. 82 & 83) 14.21 Diverter Valve Assembly (Cont) 14.22 Flow Regulator (Figs. 85 & 86) 46 14.23 Secondary Heat Exchanger (Fig. 87) 14.24 Flue Overheat Thermostat (Fig. 88) 15.0 Illustrated Wiring Diagram Control PCB br - brown bk - black b - blue r - red y - yellow g/y- green / yellow w - white gr - grey Page Page Fault Finding Solutions Sections A to F A B F D C G Fault Finding Solutions Sections G to L H K I A B E C D 18.0 Short Parts List GAS BOILER SYSTEM COMMISSIONING CHECKLIST CONTROLS ALL SYSTEMS CENTRAL HEATING MODE COMBINATION BOILERS ONLY SERVICE RECORD Service Provider SERVICE 1 SERVICE 3 SERVICE 5