DV Series
21
For White Rodgers Control,
depress knob slightly and rotate
clockwise to the
“OFF”
position
.
Combination Thermostat/Gas Valve Replacement
(White Rodgers Mechanical)
Step 1. Rotate
the knob of the gas valve to the “OFF” position.
Step 2. Turn off gas supply to the water heater.
Step 3. Disconnect the gas supply line from the gas valve.
Step 4. Turn off the water supply and drain the water heater
completely.
Step 5. Remove the outer jacket burner access door.
Step 6: Right side inner door removal:
a. Disconnect resettable thermal switch wire leads (leading from gas valve) and remove the
wire tie from the feedline.
b. Remove two (2) 1/4
” hex
drive screws from the right side inner door.
c. Remo
ve two (2) 1/4” hex drive screws from the flange section of the inner door.
d. Remove the right side inner door and set aside. Be careful to not damage the gasket
material on the inner door.
Step 7. Removal of gas valve:
a. Disconnect the main burner feedline, pilot tube, and thermocouple from the gas valve.
Remove the burner from the combustion chamber.
Note: Feedline nut for natural gas control uses right hand threads; L.P. control uses left
hand thread.
b. Remove piezo bracket with piezo igniter (refer to Service Procedure IV) from gas valve.
c. Remove gas valve from the water heater, rotating counter clockwise using a control body
wrench or a length of 1/2” NPT pipe threaded into the inlet of the control.
To remove or
install control,
insert only 1/2”
NPT threaded
pipe into inlet and
use to loosen or
tighten control
Service Procedure IV
Gas Control Testing and
Replacement
21
