Bradford White UPV Series Service Manual page 38

UPV Service Procedure XV – Resettable Thermal Switch Testing and
Replacement
Resettable Thermal Switch Replacement
Step 1. Rotate the gas control knob to the "OFF" position.
Step 2. Remove the outer jacket door.
Step 3. Disconnect the black wire leads from the resettable
thermal switch.
Step 4. Remove (2) ¼" hex drive screws from the manifold mount.
Step 5. Remove the resettable thermal switch from manifold
mount (Phillips screwdriver).
Step 6. Place new resettable thermal switch in place. Be sure
contact surface of resettable thermal switch and manifold
mount are free of any debris. Secure resettable thermal
switch into place using screws from Step 4. DO NOT
OVER TIGHTEN SCREWS.
Step 7. Reconnect the black wire leads from gas valve and thermopile to resettable thermal switch.
Note: Wire terminations are interchangeable with either resettable thermal switch
connection.
Step 8. Replace the outer jacket door.
Step 9. To resume operation, follow the instructions located on the lighting instruction label or the
lighting instruction located in the Installation and Operation Manual.
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