Service manual

– 22 –
Themal Fuse Replacement
Fan Motor Replacement
B
A
C
Circuit Board Settings
Circuit Board
UP
When changing the fan motor.
When Bell-mouth(B) is installed in the old fan motor, install Bell-mouth (B) as shown in figure to maintain the proper air volume.
When you change the fan motor, please remove this part from the old fan motor, and install in the new fan motor.
After changing the fan motor, please follow the procedure "Circuit Board Settings ".
The water heater will not operate properly unless you carry out this step.
A : Fan motor
B : Bell-mouth
C : tapping screw ◊ 3
"UP" and "DOWN" buttons for adjusting
the manifold pressure settings
DOWN
1. Check that there is no water flow.
2. Within the first ten minutes of connecting electrical power, before turning it on,
press and hold both the "UP" and "DOWN" buttons on the Circuit Board as illustrated.
3. In about 10 seconds after the above mentioned setting 2.,the fan motor rotation as well as the gas solenoid valve
opening/closing continues simultaneously . Please release the "UP" and "DOWN" buttons after confiming it.
This operation continues for about 3 minutes after the release of buttons until it ceases automatically.
Note .
Termination operation will stop in about 3 minutes.
If the fan motor does not operate, repeat Procedures 1 - 3 again.
The switches on the board will not respond while the fan is operating.
Rigth side Left side
Beginning of winding
How to install a thermal fuse
Front
Back
Thermal fuse
Fastener
Thermal fuse
Fastener
Thermal fuse
Fastener
Thermal fuse
Fastener
Install a thermal fuse according to the following procedures.
1.Start winding the thermal fuse from the front left fastener.
2.Wind the thermal fuse according to the order shown in illustration.
In this case, be sure to attach the thermal fuse to the fastener on each surface so that it does not loosen.
Caution is also necessary on sections where the thermal fuse is passed through.
Caution
1.Thermal fuse may become broken if it is bent suddenly or twisted with strong force.
Make sure that the bending remains smaller than 30mm in radius.
2.Be sure to keep the thermal fuse from coming in direct contact with the freezing prevention heater.