12
PILOT ASSEMBLY
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
(See Fig. 4)
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 hex-shaped connector at the pilot orifice
inlet in place with an appropriate wrench while
using another wrench to loosen the pilot orifice.
6. Reassemble by reversing above steps.
B. Thermocouple
(See Fig. 4)
1. Pull back sharply on the thermocouple’s lead or
its body. It will then pop out of its mounting hole.
2. Loosen the lead connector nut threaded into the
power unit on the pilot safety gas control valve and
slide thermocouple through bushing on back of
heater to remove.
3. To assemble, reverse above procedure.
ATTENTION
■
The pilot orifice hole is drilled to a specific diameter to
match the fuel and gas pressure being used.
■
Do not push 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.
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.
PILOT ORIFICE
THERMOCOUPLE
BURNER
BURNER ORIFICE
ELECTRODE
Fig. 4
ELECTRODE ON CENTER
LINE OF PILOT ORIFICE
