1. Shut off the gas supply to heater.
2. Disconnect the heater from its electrical supply.
3. Let the appliance cool down so pilot assembly is cool
to touch.
4. Loosen wing screw at pilot assembly by turning
counterclockwise. It is not necessary to remove the
screw entirely from the pilot assembly. You need to
loosen it just enough to allow you to remove the pilot
shield.
5. When loosened, pull up on the pilot shield, thereby
exposing the pilot bracket, pilot orifice, and
thermocouple.
6. To remove the thermocouple, loosen the attachment
nut (turn counterclockwise) until the nut is entirely
out of the pilot bracket. Remove the thermocouple
from the pilot bracket.
7. Remove the lead connector nut threaded into the
power unit on the gas control valve.
8. To assemble, reverse above procedure.
IMPORTANT
■
The thermocouple is an important safety device which
works directly with the pilot safety control valve. It
should only be replaced with L.B. White part number
120-21196.
■
When threading the thermocouple’s connector nut back
into the power unit on the gas control valve, thread the
nut in “finger tight” and “snug it” in place with a wrench.
DO NOT OVERTIGHTEN OR USE UNNECESSARY FORCE
ON THE NUT WHEN TIGHTENING. Doing so will destroy
the power unit in the gas control valve.
■
Do not use a pliers when removing or replacing
thermocouple attachment nut or connector nut. Doing
so will round off the hex nuts, making servicing difficult
later on. Always use the appropriate size wrench.
THERMOCOUPLE
15
THERMOCOUPLE TIP
PILOT ASSEMBLY
THERMOCOUPLE LEAD
OPTIONAL ATTACHMENT NUT
THERMOCOUPLE LEAD
CONNECTOR NUT
POWER UNIT CONNECTOR
CONTACT
POWER UNIT
FIG. 10
