Bradford White TW4-75S-76B-3X - Manual (Page 28)

TTW SERVICE PROCEDURE VI
Gas Control & Thermal Well Testing
and Replacement
Gas Control & Thermal Well Removal From Water Heater
(For
water heaters with serial numbers that begin with “J” or sooner.)
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 (For water heaters with
serial numbers that begin with “J” or sooner.)
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". Hold control in position and remove tool. 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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