c. Remove the pilot orifice screen at the inlet of the
orifice prior to cleaning. Reinstall the screen after
cleaning.
d. Ensure pilot orifice holes are not plugged with dirt
or other materials. Clean the pilot orifice or
replace if necessary. The replacement orifice
ships with an orifice screen.
3. Thermocouple
a. Using appropriate wrench, loosen the
thermocouple’s attachment nut at thermocouple
holder on pilot bracket. See Fig. 7.
b. Loosen thermocouple connector nut from pilot
safety control valve.
c. Remove thermocouple from burner assembly.
4. Completion
a. To assemble, reverse these procedures.
b. Tighten all gas connections securely.
c. Open fuel supply valves to the heater.
CC.. M
MOOTTOORR AANNDD FFAANN AASSSSEEM
MBBLLYY
1. Initial Preparation
a. Close fuel supply valves to heater.
b. Disconnect heater from its electrical supply.
2. Motor and Fan Assembly Removal
a. Remove the four bolts which secure the motor to
the motor mounting bracket. See Fig 8.
b. Pull motor and fan assembly from heater.
c. Loosen set screw on hub of fan.
d. Pull fan blade from motor shaft.
e. To assemble, reverse these procedures.
FIG. 8
FIG. 9
1133
1122
BOLTS (4)
MOUNTING BRACKET
SET SCREW
MOTOR
FAN HUB FLUSH
WITH END OF
MOTOR SHAFT
AATTTTEENNTTIIOONN
■
Do not insert sharp instruments into the pilot orifice
hole.
■
Clean the orifice only with compressed air, soft brush,
or dry rag.
AATTTTEENNTTIIOONN
■
Do not use pliers when removing or tightening the
thermocouple’s attachment or connector nuts. Doing
so will round off the nuts creating service problems.
Always use the appropriate wrench.
■
Ensure the thermocouple is fully and firmly positioned
in the pilot bracket by its attachment nut.
■
Do not make sharp kinks or bends in the thermocouple
lead. Doing so may damage the thermocouple.
■
Thread the thermocouple’s connector nut into the
safety control valve fingertight. Snug it in place with
appropriate wrench.
AATTTTEENNTTIIOONN
■
Ensure set screw of fan is positioned at flat of motor
shaft before tightening.
■
Position fan before tightening set screw so its hub is
flush with end of motor shaft. See Fig 9.