Bradford White EF Series Service Manual page 29

Exhaust Pressure Switch Replacement Procedure
Step 1. Position main power switch to "OFF" position.
Step 2. Loosen adhesive backed rubber escutcheon from service panel access cover
and slide escutcheon back along exhaust pipe to allow for removal of cover.
Step 3. Remove screws from service panel access cover
(¼" nut driver) and remove cover from heater.
(see photo 22)
Step 4. Disconnect silicone tubing and wire leads from
pressure switch. (see photo 23)
Step 5. Remove pressure switch mounting screws
(5/16" wrench) and remove pressure switch.
Step 6. Assemble new pressure switch to heater using
screws from step 5.
Step 7. Reconnect wire leads. Note: wire leads are
interchangeable with either terminal.
Step 8. Reconnect silicone tubing to pressure switch
as follows:
a) Exhaust pipe tubing connects to
negative (-) side of switch
identified by the (-) symbol
located on switch.
B) Exhaust collector tubing connects
to positive (+) side of switch
Example of switch
showing positive
identified by the (+) symbol
side identifier
located on switch.
Step 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 instruction located in the installation
and operating instruction manual.
Step 10. Reinstall service panel access cover and
rubber escutcheon.
Service Procedure EF-VI
Exhaust Pressure Switch Testing and Replacement
22
23
Wire leads
Exhaust collector
pressure tap location
Exhaust pipe
pressure tap location
Rubber
escutcheon
Pressure switch
mounting screw
5/16 hex head
Silicone tubing
Page 29
Page 29