6. Replacement of Parts 121
6.1 Replacement Procedure 121
6.2 Components Replacement Instructions 121
6.2.1 PCB 121
6.2.2 Fuse 122
6.2.3 Fan Motor (Combustion Air) 122
6.2.4 Flame Rod 123
6.2.5 Ignition Transformer 124
6.2.6 APS 124
6.2.7 Main Gas Valve 125
6.2.8 Condensate Trap 126
6.2.9 Flow Sensor 127
6.2.10 Circulation Pump 127
6.2.11 3-way Valve 128
6.2.12 Water Pressure Sensor 129
6.2.13 Space Heating Strainer 129
6.2.14 Auto Feeder Valve 130
6.2.15 DHW Heat exchanger 130
7. Components Diagram and Part List 131
7.1 Case Assembly 131
7.2 Burner Assembly 132
7.3 Waterway Assembly 134
7.4 Fan (Gas) Assembly 136
8. Inspection and Maintenance Schedule 138
8.1 Annual Servicing 138
8.2 Maintenance Report 138
8.3 Maintenance Schedules 138
8.4 Inspection Report 138
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