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Flame Sensor
- Refer to
FIGURE 28
and locate
the flame sensor. Disconnect the wire; remove the
screw and the flame sensor. Clean with an emery
cloth.
Flame Sensor
12.2.5
Fan Motor, Fan
Blades, and Guard
Remove dirt and grease from the motor, the fan guard, and blades. Use
care when cleaning the fan blades to prevent causing misalignment or
imbalance. Check that the hub of the fan blades is secure to the shaft.
Follow these instructions for replacement of the fan guard, fan motor and/
or fan blades.
1. If the heater is installed, turn off the gas and disconnect the electric
power.
2. Open the access door and disconnect the fan motor wires, capacitor
wires at the capacitor, and ground screw.
3. Remove the assembled parts (the fan guard, the motor and the fan
blade).
4. Disassemble and replace whatever parts are needed and reassemble
using whatever part(s) are being replaced and the original parts.
Be sure the fan blade is in the proper position on the shaft; refer to the
illustration and table in
FIGURE 31.
12.2 Maintenance
Procedures
(cont’d)
12.2.4. Ignition System (cont’d)
FIGURE 30 - Ignitor showing required Spark
Gap Measurement
Dimension A
Size
inches
mm
130,
180
1-5/8
67
260
2
51
310
1-7/8
48
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FIGURE 31 - Fan Blade
Position on the Shaft
Position the assembly on the heater. Attach the fan guard.
Rotate the fan blade to check for adequate clearance. If adjustment is
required, loosen the mounting screws, re-position the fan guard, and
tighten the screws. Rotate the fan blade and re-check for adequate
clearance. Repeat this procedure until the assembly is positioned
properly.
5. Reconnect the fan motor wires according to the wiring diagram and
close the access panel.
6. Restore power to the heater and turn on the gas. Light, following the
instructions on the lighting instruction plate. Check for proper operation.
12.2.6
Venter Motor and
Wheel
Remove dirt and grease from the motor casing, the venter housing, and the
venter wheel. Venter motor bearings are permanently lubricated. Follow
these instructions for replacement of the venter motor and wheel assembly.
Keep all hardware removed to be used in re-assembling and installing the
replacement parts.
12. Maintenance and
Service (cont’d)
Form I-UEAS, Page 44
