Desa 100,000 Btu/Hr Owner's Manual page 16

5. Rotate fan so set screw is visible (see
Figure 19). Measure gap from side of fan
to side of housing. Make note of measure-
ment.
6. Remove 3 nuts securing motor support
to blower housing (see Figure 18). Care-
fully remove motor assembly from blower
housing.
7. Use T20 torx driver to loosen setscrew
which holds fan to motor shaft.
8. Slip fan off motor shaft.
9. Rinse fan under running water. Kerosene
may be required if there are dirt and oil
deposits on fan.
10. Dry fan thoroughly.
11. Replace fan on motor shaft.
12. Replace motor assembly and sleeve.
13. Rotate fan back to point where set screw
is visible.
14. Set gap (measured in step 5) and tighten
fan set screw on flat of motor shaft to 80
inch-lbs.
15. Replace blower assembly and reconnect
wires.
16. Replace upper shell and upper shroud.
Motor
Motor Shaft
Measure Gap
Between Fan
and Housing
(typical range:
0.26"-0.27")
Figure 19 - Fan Side View
16
SerViCe ProCedureS
Continued
Fan
Setscrew
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AIR OUTPUT, AIR INTAKE AND LINT
FILTERS
1. Remove filter end cover screws using
5/16" nut-driver (see Figure 20).
2. Remove filter end cover.
3. Replace air output and lint filters.
4. Wash or replace air intake filter (see Preven-
tative Maintenance Schedule, page 12).
5. Replace filter end cover.
IMPORTANT: Do not oil filters.
6. Proceed to Pump Pressure Adjustment.
Lint Filter
Air Output Filter
Figure 20 - Air Output, Air Intake, and
Lint Filters
PUMP PRESSURE ADJUSTMENT
1. Remove pressure gauge plug from filter
end cover (see Figure 21).
2. Install accessory pressure gauge (part
number HA1180, see page 19).
3. Start heater (see Operation, page 10).
Allow motor to reach full speed.
4. Adjust pressure. Turn relief valve to right
to increase pressure. Turn relief valve to
left to decrease pressure. See specifica-
tions correct pressure for each model (see
Figure 22, page 17).
5. Remove pressure gauge. Replace pres-
sure gauge plug in filter end cover.
Pressure
Gauge Plug
Figure 21 - Pressure Gauge Plug Removal
Air Intake Filter
Filter End
Cover
Relief Valve
118419-01E