www.desatech.com
113170-01E
14
Temp
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Tem
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Ther
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Term
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HI
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5
6
4
3
2
1
11293
5-01
Fuse
Fuse Holder
Figure 26- Replacing Fuse
PUMP ROTOR
(Procedure if Rotor is Binding)
1. Remove upper shell (see
Upper Shell Re-
moval
, page 10).
2. Remove fan guard.
3. Remove filter end cover screws using 5/16"
nut driver (see Figure 23).
4. Remove filter end cover and air filters.
5. Remove pump plate screws using 5/16" nut-
driver.
6. Remove pump plate.
7. Remove rotor, insert and blades (see
Figure 23).
8. Check for debris in pump. If debris is found,
blow out with compressed air.
9. Install insert and rotor.
10. Check gap on rotor. Adjust to .076/.101 mm
(.003"/.004") if needed (see Figure 24).
Note:
Rotate rotor one full turn to ensure the
gap is .076/.101 mm (.003"/.004") at tightest
position. Adjust if needed.
11. Install blades, pump plate, air filters and filter
end cover.
12. Replace fan guard and upper shell (see
Upper
Shell Removal
, page 10).
13. Adjust pump pressure (see
Pump Pressure
Adjustment
, page 10).
Note:
If rotor is still binding, proceed as follows.
14. Perform steps 1 through 6.
15. Place fine grade sandpaper (600 grit) on flat
surface. Sand rotor lightly in “figure 8” motion
four times (see Figure 25).
16. Reinstall insert and rotor.
17. Perform steps 10 through 12.
Sandpaper
Figure 25 - Sanding Rotor
SERVICE PROCEDURES
Continued
Note:
Route hoses as shown in Figure 17, page
12 or Figure 20 according to model. Hoses are
not to touch photocell bracket.
6. Replace control cover.
7. Replace upper shell (see
Upper Shell Removal
,
page 10).
Figure 23 - Rotor Location
Insert
Blade
Rotor
Pump Plate
Air
Intake
Filter
Air Output Filter
Filter End
Cover
Gap Adjusting Screw
Rotor
Blade
.003"/.004"
(.076-.101 mm)
Gap Measured
With Feeler
Gauge
Gap Adjusting Screw
Figure 24 - Gap Adjusting Screw
Locations
Barb
Fitting
Pump End
Cover
Air Hose
Figure 22 - Air Hose to Barb Fitting
IGNITION CONTROL ASSEMBLY
WARNING: High voltage!
1. Unplug heater.
2. Remove control cover screws (2) using phil-
lips screwdriver to expose ignition control
assembly (see Figure 11, page 10).
3. Remove fuse from fuse holder.
4. Replace with new fuse (DESA Heating Prod-
ucts part number 113752-01). Do not substitute
a fuse with a higher current rating. Use an
equivalent 6.3 amp time lag, 5 x 20 mm fuse.
5. Replace control cover (see Figure 11,
page 10).
