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104468
PORTABLE FORCED AIR HEATERS
R
Pump Rotor
(Procedure if rotor is binding)
1. Remove upper shell (see page 8).
2. Remove filter end cover screws using
5/16" nut-driver.
3. Remove filter end cover and air filters.
4. Remove pump plate screws using 5/16"
nut-driver.
5. Remove pump plate.
6. Remove rotor, insert, and blades.
7. Check for debris in pump. If debris is
found, blow out with compressed air.
8. Install insert and rotor.
9. Check gap on rotor. Adjust to .076/.101
mm (.003"/.004") if needed (see Fig-
ure 27).
Note:
Rotate rotor one full turn to insure the
gap is .076/.101 mm (.003"/.004") at tight-
est position. Adjust if needed.
10. Install blades, pump plate, air filters,
and filter end cover.
11. Replace fan guard and upper shell.
12. Adjust pump pressure (see page 10).
Note:
If rotor is still binding, proceed as
follows.
13. Perform steps 1 through 6 above.
14. Place fine grade sandpaper (600 grit)
on flat surface. Sand rotor lightly in
“figure 8” motion four times (see Fig-
ure 28).
15. Reinstall insert and rotor.
16. Perform steps 10 through 12 above.
Figure 25 - Rotor Location, 35/70,000 Btu/Hr Models
Sandpaper
Gap Adjusting
Screw
Gap Adjusting
Screw
Blade
Figure 26 - Rotor Location, 100/150,000 Btu/Hr Models
Insert
Blade
Rotor
Pump
Plate
Air Intake
Filter
Air Output
Filter
Pump
Plate
Insert
Rotor
Blade
Filter End
Cover
Air
Intake
Filter
Air Output
Filter
Fan Guard
.076/.101 mm (.003"/.004") Gap
Measured With Feeler Gauge
Rotor
Fan Guard
Filter End
Cover
Figure 28 - Sanding Rotor
Figure 27 - Gap Adjusting Screw
Locations
SERVICE
PROCEDURES
Continued