Pump Rotor - Desa 150,000Btu/Hr Ower's Manual

70,000 110,000 150,000 AND 165,000 BTU/HR
PORTABLE FORCED AIR HEATER
SERVICE
PROCEDURES
Continued
NOZZLE
1. Remove upper shell (see page 8).
2. Remove fan (see page 8).
3. Remove fuel and air line hoses from
burner head.
4. Remove spark plug wire from spark plug.
5. Remove spark plug from burner head
using 13/16" open-end wrench.
6. Remove three screws using 5/16" nut-
driver and remove burner head from
combustion chamber.
7. Place burner head into vise and lightly
tighten.
8. Carefully remove nozzle from burner
head using 5/8" socket wrench (see Fig-
ure 13).
9. Blow compressed air through face of
nozzle. This will free any dirt in
nozzle area.
10. Inspect nozzle seal for damage.
11. Replace nozzle into burner head and
tighten firmly (80-110 inch-pounds).
12. Attach burner head to combustion
chamber.
13. Install spark plug in burner head.
14. Attach spark plug wire to spark plug.
15. Attach fuel and airline hoses to burner
head.
16. Replace fan (see page 8).
17. Replace fan guard and upper shell.
Combustion
Chamber
Screw
Fuel Line Hose
Air Line Hose
Figure 12 - Removing Burner Head
Nozzle Face
Nozzle
Burner Head
Figure 13 - Removing Nozzle

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 .003"/
.004" if needed (see Figure 15).
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 9).
Note: If rotor is still binding, proceed
Burner Head
as follows.
13. Perform steps 1 through 6 above.
Spark Plug
14. Place fine grade sandpaper (600 grit)
Wire
on flat surface. Sand rotor lightly in
"figure 8" motion four times (see Fig-
ure 16).
Spark
15. Reinstall insert and rotor.
Plug
16. Perform steps 10 through 12 above.
Nozzle
Seal
Fuel Line
Fitting
Air Line Fitting
10
Pump Plate
Blade
Insert
Rotor
Air Output
Filter
50 ROTOR-Domestic
PFA/P 056B
Fan Guard
70,000 Btu/Hr Model
Pump Plate
Blade
Insert
Rotor
100 ROTOR-Domestic PFA/P 059A
Air Output
Filter
Fan Guard
110,000 150,000 and 165,000 Btu/Hr
Models
Figure 14 - Rotor Location
Gap Adjusting Screw
Rotor
Blade
ROTOR GAP ADJUST
PFA/OV 007
Gap Adjusting Screw
Figure 15 - Gap Adjusting Screw
Locations
Sandpaper
ROTOR ON SANDPAPER
Figure 16 - Sanding Rotor
Air Intake Filter
Filter End
Cover
Air Intake Filter
Filter End
Cover
.003"/.004"
Gap
Measured
With Feeler
Gauge
PFA/OV 008
103301