Desa Air Conditioner - Manual (Page 8)

www.desatech.com 113893-01B 8
SERVICE PROCEDURES
WARNING: Never service
heater while it is plugged in,
connected to propane supply,
operating or hot. Severe burns
and electrical shock can occur.
MOTOR
1. With heater on its side, remove access panel.
2. Access ground screw through underside of
heater base. Remove ground screw. Disconnect
the green motor wire and the green power cord
wire from underside of shell (see Figure 5).
3. Remove two black wires from motor to ter-
minal board.
4. Carefully push motor wires through hole in
bottom of shell.
5. Remove screws holding motor mount to shell.
Use nut-driver (see Figure 5).
6. Carefully pull motor and fan out of shell.
IMPORTANT: Be careful not to damage fan.
Do not set motor and fan down with the weight
resting on fan. This could damage fan pitch.
7. Use hex wrench to loosen setscrew which
holds fan to motor shaft.
8. Remove fan. Be careful not to damage the fan
blade pitch.
9. Use nut driver to remove two nuts that attach
motor to motor mount.
10. Discard old motor.
11. Attach motor to motor mount with two nuts.
Tighten nuts firmly.
12. Replace fan on motor shaft. Make sure set
screw contacts flat surface on motor shaft.
13. Tighten set screw firmly (40-50 inch-pounds
[46.08-57.60 kilogram-centimeters]).
14. Carefully route motor wires through hole in
shell. Place motor, motor mount and fan guard
into rear of heater shell, as shown in Figure 5.
15. Insert screws through heater shell and into
motor mount. Tighten screws firmly.
16. Turn heater on its side to access opening in
bottom of base. Connect green wires from
motor, transformer and power cord to heater
shell using ground nut.
17. Attach two black wires from motor to terminal
board (see Wiring Diagram, page 10, for cor-
rect locations).
18. Replace access panel.
Figure 5 - Removing Motor and Fan
Guard from Heater (Heater may vary
from illustration)
Screw
Screw
Motor and
Fan Guard
FAN
1. Remove motor, motor mount and fan (see
Motor, steps 1 through 8).
2. Clean fan using soft cloth moistened with
kerosene or solvent.
3. Dry fan thoroughly.
4. Replace fan on motor shaft. Make sure set-
screw is touching back of flat surface on motor
shaft (see Figure 6).
5. Place setscrew on flat of shaft. Tighten set-
screw firmly (40-50 inch-pounds [46.08-57.60
kilogram-centimeters]).
6. Place motor, motor mount and fan guard
into rear of heater shell (see Motor, steps 14
through 18).
Figure 6 - Fan, Motor Shaft and Setscrew
Location
Figure 7 - Fan Cross Section
Motor Shaft
Fan
Setscrew
Fan Hub
Setscrew
Motor
Shaft