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THERMOCOUPLE PROBE MOTOR HEAT EXCHANGER BURNER FUSE
THERMOSTAT PRV PCB IGNITOR DIAPHRAGM GAS VALVE
TRANSFORMER PUMP PILOT INJECTOR ELECTRODE GAUGE
VALVE RELAY POTENTIOMETER KNOB EXPANSION VESSEL GOVERNOR
WASHER RESISTOR PRESSURE GAUGE LEAD FAN LAMP
LIGHT

 SENSOR

 PRESSURE SWITCH

 MICROSWITCH

 FLOW SWITCH

 FLOW REGULATER