L.B. White 100 Workman - NG Low Pressure - Manual (Page 12)

THERMOCOUPLE
ELECTRODE
BRACKET
PILOT ORIFICE
PILOT HEAD
12
PILOT ASSEMBLY
THERMOCOUPLE
ELECTRODE ON CENTER
LINE OF PILOT ORIFICE
1. Shut off gas supply to heater.
2. Let the heater cool down.
3. Remove screws that secure barrel assembly to base
of heater.
4. Remove barrel assembly from base, exposing burner
and pilot assembly.
5. The pilot orifice and thermocouple are located at the
burner. Refer to the following to remove these
components for servicing.
A. Pilot O Orifice
1. Remove thermocouple from bracket.
2. Remove wire from igniter.
3. Remove screws that hold burner head to base of
heater.
4. Slide burner head off of base to expose pilot
orifice.
5. Hold the pilot head in place with an appropriate
wrench while using another wrench to loosen the
pilot orifice. See Fig. 3
FIG. 3
ATTENTION
■ The pilot orifice hole is drilled to a specific diameter to
match the fuel and gas pressure being used.
■ Do not insert sharp instruments into the orifice holes.
■ Clean the orifice only with compressed air, a soft brush
or dry rag. If necessary, replace the pilot orifice.
■ Do not use a pliers to remove the pilot orifice from its
gas supply line.
■ Doing so may round off the hex sides of the orifice,
making for difficult servicing later on. Always use a
wrench.
6. Reassemble by reversing above steps.
B. Thermocouple
1. Pull back sharply on the thermocouple’s lead or
its body. It will then pop out of its mounting hole.
See Fig. 3.
2. Loosen the lead connector nut threaded into the
power unit on the pilot safety gas control valve
and slide thermocouple through hole on back of
heater to remove.
3. To assemble, reverse above procedure.
ATTENTION
■ The thermocouple has a push-in mounting clip. Make
sure on reassembly that the thermocouple is completely
pushed into its bracket. Failure to do so may cause
pilot outage problems.
■ 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 the
connector nut.
■ Doing so will round off the hex, making servicing
difficult later on. Always use the appropriate size
wrench.