1. Shut off the gas supply to heater.
2. Disconnect the heater from its electrical supply.
3. Let the heater cool down so the 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 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 the thermocouple part
number as given in the parts list for the specific model.
■
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 (optional) or connector
nut. Doing so will round off the hex nuts, making
servicing difficult later on. Always use the appropriate
size wrench.
THERMOCOUPLE
17
FIG. 13
THERMOCOUPLE TIP
PILOT ASSEMBLY
THERMOCOUPLE LEAD
OPTIONAL ATTACHMENT NUT
THERMOCOUPLE LEAD
CONNECTOR NUT
POWER UNIT CONNECTOR
CONTACT
POWER UNIT
SHIELD
BRACKET
WING SCREW
ORIFICE
TUBE W/NUTS
THERMOCOUPLE
STUD
GASKET*
SPACING RIBS*
BURNER CASTING
* NOT ON ALL HEATERS
FIG. 12