Service Procedures - Desa PROPANE CONSTRUCTION HEATERS Owner's Manual

SERVICE
PROCEDURES
WARNING: Never service
heater while it is plugged in, con-
nected to propane supply, oper-
ating, or hot. Severe burns and
electrical shock can occur.
MOTOR
1. While on heaters side Remove base
tray.
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 black and white motor wires
from terminal board (see Figure 5).
4. Carefully push motor wires through
hole in bottom of shell.
5. Remove screws holding motor mount
to shell. Use nut-driver (see Figure 6).
Ground
Screw
Motor
Green
Lead
Figure 5 - Location of Ground Screw
Motor
Mount
Screw
Hole in
Shell
for Wires
Figure 6 - Removing Motor, Motor Mount,
and Fan Guard from Heater
102370-01H
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).
14. Carefully route motor wires through
hole in shell (see Figure 7). Place motor,
motor mount, and fan guard into rear
of heater shell.
15. Insert screws through heater shell and
into motor mount. Tighten screws
Transformer
Green Lead firmly.
16. Turn heater on its side to access
opening in bottom of base. Connect
Power
Cord green wires from motor, transformer,
Green
and power cord to heater shell using
Lead
ground nut (see Figure 5).
17. Attach black and white wires to
terminal board (see Wiring Diagram,
page 9, for correct locations) .
Terminal
18. Replace base tray.
Board
Fan
Guard
Hole in
Motor
Shell
Mount
Figure 7 - Replacing Motor, Motor Mount,
and Fan Guard into Heater
OWNER'S MANUAL
FAN
1
2.
3.
4.
5.
6.
Figure 8 - Fan, Motor Shaft, and
Setscrew Location
Figure 9 - Fan Cross Section
7
Remove motor, motor mount, and fan
(see Motor, steps 1 through 8) .
Clean fan using soft cloth moistened
with kerosene or solvent.
Dry fan thoroughly.
Replace fan on motor shaft. Make sure
setscrew is touching back of flat
surface on motor shaft (see Figure 8).
Place setscrew on flat of shaft. Tighten
setscrew firmly (40-50 inch-pounds).
Place motor, motor mount, and fan
guard into rear of heater shell (see
Motor, steps 14 through 18).
Fan
Setscrew
Motor shaft
Fan
Hub
Motor
Shaft
Setscrew
Continued