Desa H.S.I. Series Owner's Manual page 10

• SERVICE PROCEDURES
SERVICE
PROCEDURES
Continued
PUMP ROTOR
(Procedure if Rotor is Binding)
1. Remove upper shell (see page 7).
2. Remove filter end cover screws using
5/16" nut-driver.
3. Remove filter end cover and air filters
(see Figure 16).
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 .003"/
.004" if needed (see Figure 17).
Note: Rotate rotor one full turn to in-
sure the gap is .003"/.004" at tightest
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 7).
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 18).
15. Reinstall insert and rotor.
16. Perform steps 10 through 12 above.
For more information, visit www.desatech.com
Blade
Pump
Air
Plate
Intake
Filter
Insert
Rotor
Air Output
Filter
Fan Guard
Figure 16 - Rotor Location
Gap Adjusting Screw
Blade
Gap Adjusting Screw
Figure 17 - Gap Adjusting Screw
Locations
Sandpaper
Figure 18 - Sanding Rotor
10
IGNITION CONTROL
ASSEMBLY
(Procedure for Replacing Fuse)
Filter
End
Cover
WARNING: High Voltage!
1. Unplug heater
2. Remove side cover screws (4) using
5/16" nut-driver to expose ignition con-
trol assembly.
3. Remove fuse cover (see Figure 19).
4. Remove fuse from fuse clips.
5. Replace fuse with fuse of the same type
and rating (GMA-10). Do not substi-
tute a fuse with a higher current rating.
6. Replace fuse cover.
7. Replace side cover.
.003"/.004"
Gap
Measured
With
Feeler
Gauge
Rotor
Figure 19 - Replacing Fuse
Fuse
Fuse
Clips
Cover
Fuse
107325