Bradford White U-TW4-75S-76R-3N - Manual (Page 30)

Resettable Thermal Switch Replacement
Step 1. Position gas control power switch to
the “OFF” position.
Step 2. Remove outer jacket door.
Step 3. Disconnect red wire leads from resettable thermal switch.
Step 4. Remove (2) ¼” hex drive screws from the manifold
cover and slid to the right to remove from burner
assembly.
Step 6. Remove resettable thermal switch from manifold
cover (Phillips screw driver).
Step 7. Place new resettable thermal switch in place. Be sure contact surface of resettable thermal switch and
manifold cover are free of any debris. Secure resettable thermal switch into place using screws from step 6.
DO NOT OVER TIGHTEN SCREWS.
Step 8. Place manifold cover back in position and secure using the screws from step 4.
Step 9. Reconnect wire leads from gas control and thermopile to resettable thermal switch.
Note: Wire termination is interchangeable with either resettable thermal switch connection.
Step 10. Replace outer jacket door.
Step 11. To resume operation follow the instructions located on the lighting instructions label or the lighting
instructions located in the installation and operation manual.
Manifold Cover
¼” Hex Drive Manifold
Cover Screws
Phillips Screws
Red Wire Leads
U TTW SERVICE PROCEDURE IX
Resettable Thermal Switch Testing
and Replacement
Page 30
Gas Control shown in the “OFF” Position
R
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