IGNITION CONTROL
ASSEMBLY
WARNING: High voltage!
1. Unplug heater.
2. To expose the ignition control assembly,
remove the control panel side cover
screws using 5/16" nut-driver. On 160,
175 and 220 models, remove two wheel
support bolts and nuts with a Phillips
screwdriver and an adjustable wrench.
3. Remove fuse from fuse clips (see Figure 19).
4. Replace fuse with fuse of the same type
and rating (7A, 125VP). Do not substitute
a fuse with a higher current rating.
5. Replace control panel side cover.
Figure 19 - Replacing Fuse
PUMP ROTOR
(Procedure if Rotor is Binding)
1. Remove upper shell (see Upper Shell
Removal, page 13).
2. Remove filter end cover screws using
5/16" nut driver (see Figure 20).
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 (see
Figure 21).
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 0.076/0.101 mm
(0.003"/0.004") if needed (see Figure 21).
Note: Rotate rotor one full turn to ensure
the gap is 0.076/0.101 mm (0.003"/0.004")
at tightest position. Adjust if needed.
160108-01
SERVICE PROCEDURES
Continued
Fuse
Ignition
Control
Assembly
www.usaprocom.com
10. Install blades, pump plate, air filters, and
filter end cover.
11. Replace fan guard and upper shell (see
Upper Shell Removal, page 13).
12. Adjust pump pressure (see Pump Pres-
sure Adjustment, page 14).
Note: If rotor is still binding, proceed as
follows.
13. Perform steps 1 through 6.
14. Place fine grade sandpaper (600 grit) on
flat surface. Sand rotor lightly in "figure 8"
motion four times (see Figure 22).
15. Reinstall insert and rotor.
16. Perform steps 10 through 12.
Insert
Rotor
Air Output Filter
Figure 20 - Rotor Location
Gap Adjusting
Screw
Blade
Gap Adjusting Screw
Figure 21 - Gap Adjusting Screw
Locations
Sandpaper
Figure 22 - Sanding Rotor
Air
Blade
Intake
Pump
Filter
Plate
Filter
End
Cover
0.003"/0.004"
(0.076-0.101
mm) Gap
Measured With
Feeler Gauge
Rotor
17