Bradford White TW4-75S-76B-3X - Manual (Page 26)

TTW SERVICE PROCEDURE VI
Gas Control & Thermal Well Testing
and Replacement
Gas Control & Thermal Well Removal From Water Heater
Step 1. Position gas valve power switch to the “OFF”
position and Unplug Heater from power supply.
Step 2. Drain heater to a point below the gas
control level.
Step 3. Turn off gas supply to water heater and
disconnect gas piping from gas control.
Step 4. Disconnect wire harnesses and burner assembly
from gas control.
Step 5. Remove gas control & thermal well by rotating flats of Thermal Well counter clockwise (1-5/16"wrench).
Gas Control
Thermal
Well
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Gas Control Removal From Thermal Well
Step 1. Position gas control power switch to the “OFF” position and unplug water heater from power supply.
Step 2. Turn off gas supply to water heater and disconnect gas piping from gas control.
Step 3. Disconnect wire harnesses & burner assembly from gas control.
Step 4. Using gas control service tool (239-45991-00) available from your BWC parts supplier, Insert tool into
back of gas control (see photos below)
Follow the steps below allows removal gas control from thermal well without
removing thermal well from tank.
Step 5. Pivot tool towards heater as far as possible (see photo below). Lift straight up on gas control. The
control should move about 1/8". At this point, remove tool not allowing the control to fall back. With
tool removed, lift straight up on control to remove completely from Thermal Well.
Service tool shown
inserted in to back
of control
Insert tool from
back of control
View from back of
control for clarity
With service tool inserted, pivot tool back towards
heater as far as possible. Lift straight up on control,
control will move 1/8". Remove tool and continue to lift
straight up on control to remove from Thermal Well.
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Page 26
Gas Control
Thermal
Well