Service manual

– 3 –
Structural Cross-section of Operation Unit
< WHC56, LWHC56>
Flue collar
Air inlet
Ignition electrode
PCB
Gas inlet
Flame rod
Igniter
Frost sensing switch
Drain trap
Water level electrode
(Front side:No.2)
(Back side:No.1)
Main flow control valve
Heat exchanger
thermistor
Bypass flow control valve
Fan motor
Water outlet thermistor
Transformer
Hot water outlet
Condensate drain outlet
Water filter
Water flow sensor
Water inlet thermistor
Cold water inlet
Power cord
Remote controller
terminal
Current leakage
safety device
Gas proportioning valve
Gas solenoid valve
Manifold
Thermal fuse
High-limit switch
Primary heat exchanger
Secondary heat exchanger