LAARS U.H.E. - Service Manual - Manual (Page 29)

U.H.E 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 photos at right)
Step 4. Disconnect silicone tubing and wire leads from
pressure switch. (see photos at right)
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
single tap located on switch
Step 10. Reinstall service panel access cover and
rubber escutcheon.
Exhaust Pressure Switch Testing and Replacement
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 instructions located in the installation
and operating instruction manual.
Exhaust Tube
pressure tap location
Rubber
escutcheon
Pressure switch
mounting screw
5/16 hex head
Silicone tubing
Wire leads
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