Bradford White U-100T-88R-3N - Manual (Page 15)

Gas Control Replacement
Step 1. Rotate knob of the gas control
to the “OFF” position.
Step 2. Turn off gas supply to water heater.
Step 3. Disconnect gas supply line from gas control.
Step 4. Turn off water supply and drain water heater completely.
Step 5. Remove the wire clip from the feedline.
Step 6. Disconnect main burner feedline, pilot tube, white thermopile wire and igniter wire from gas control and bend
the main burner feedline and pilot tube out of the way. Also disconnect the red wire leading from the thermopile
from the red wire leading from the gas control.
Step 7. Remove the gas control from the water heater by rotating counter-clockwise. It may be necessary to use a length
of ½” NPT pipe threaded into the inlet of the gas control.
Step 8. Install new gas control into the water heater.
a) Install gas control into water heater by rotating clockwise. DO NOT use a wrench on the gas control
body or damage to the gas control may occur. If necessary, use a length of ½” NPT pipe threaded into
gas inlet of gas control.
b) Position the main burner feedline and pilot tube back to the gas control and attach to the gas control.
Connect the igniter wire and the white thermopile wire to the gas control. Connect the red wire from
the gas control to the resettable thermal switch and connect the red wire from the thermopile to the
resettable thermal switch.
c) Gather the igniter wire, white thermopile wire and red thermopile wire near the side of the feedline.
Use the clip that was removed in Step 5 to secure the wires to the feedline.
d) Connect gas supply to inlet of gas control.
Step 9. Resume the water supply to the water heater. Be sure that the tank is full before operation is resumed.
Step 10. Check the main burner feedline and pilot feedline for gas leaks.
Step 10. To resume operation follow the instructions located on the lighting instruction label or the lighting
instructions located in the installation and operation manual.
Igniter wire
Pilot tube
White thermopile
wire
Main burner
feedline
Page 15
ECO-MAGNUM
75/100-Gallon Atmospheric
SERVICE PROCEDURE V
Gas Control Testing and Replacement
Red Wire Leads
Gas Control shown in the “OFF” position
15