2
B029
Page No.
1. SERVICING INSTRUCTIONS
1.1 Replacement of Parts 3
1.2 To Gain General Access
- Removing the Front Panel 3
- Removing the Side Panels 4
- To Lower the Control Panel 4
1.3 Access to the Combustion Chamber
- Removing the Sealed Combustion Chamber 5
- Removing the Burner and Injectors 5
- Removing the Electrodes 6
- Removing the Main Heat Exchanger 7
- Removing the Air Pressure Switch 7
- Removing the Venturi Device 8
- Removing the Fan 8
1.4 Servicing and Removal of the Gas Valve
- Setting Gas Pressure 9
- Removing the Spark Ignitor 11
- Removing the Gas Valve 12
1.5 Access to the Hydraulic Circuit
- Removing the D.H.W. (Secondary) Exchanger 12
- Removing the Safety Valve 13
- Removing the Automatic Air Vent 13
- Removing the Main Flow Circuit Switch 13
- Removing the Pump 14
- Removing the Pressure Gauge 14
- Removing the Expansion Vessel 15
- Removing the Overheat Thermostat 15
- Removing the Heating Temperature Sensor (N.T.C.) 15
1.6 Access to the Control System
- Checking the Fuses 16
- Removing the Time Clock 16
- Removing the P.C.B.s 17
2. FAULT FINDING
2.1 Fault Finding Guide (Flow-chart) 18
2.2 Fault Finding Using the Total Check System 23
3. ELECTRICAL DIAGRAMS
3.1 Electrical Connection 24
3.2 Functional Flow Connection 25
4. SHORT SPARE PARTS LIST
26
TABLE OF CONTENTS
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