Bradford White EF120T4003NA3 Service Manual page 37

Blocked Vent Pressure Switch Testing and Replacement
Exhaust Pressure Switch Replacement Procedure
1. Position main power switch to OFF position.
2. Loosen adhesive backed rubber escutcheon from service panel access cover and slide escutcheon back along
exhaust pipe to allow for removal of cover.
3. Remove screws from service panel access cover (1/4" nut driver) and remove cover from heater (see images
below).
4. Disconnect silicone tubing and wire leads from pressure switch (see images below).
5. Remove pressure switch mounting screws (5/16" nut driver) and remove pressure switch (common screwdriver).
6. Assemble new pressure switch to heater using screws from Step 5.
7. Reconnect red wire leads.
Note: Wire leads are interchangeable with either terminal.
8. Reconnect silicone tubing to pressure switch. The exhaust pipe tubing connects to single tap located on switch.
9. Restore 120 volt power supply to water heater and confirm proper operation following the lighting instructions on
the lighting instruction label, or the lighting instructions located in the Installation and Operating Manual.
10. Reinstall service panel access cover and rubber escutcheon.
Pressure switch
bracket sits
behind jacket
Red wire leads
Service Procedure VI:
Silicone tubing
37
Pressure switch cover
37