Service Procedures - Desa 55-F Manuel D'utilisation

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
terminal 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 dam-
age 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 ter-
minal board (see Wiring Diagram, page
10, for correct locations).
18. Replace access panel.
8
Figure 5 - Removing Motor and Fan
Guard from Heater (Heater may vary
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
setscrew is touching back of flat surface
on motor shaft (see Figure 6).
5. Place setscrew on flat of shaft. Tighten
setscrew 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
www.desatech.com
Screw
from illustration)
Fan
Motor Shaft
Location
Hub
Setscrew
Figure 7 - Fan Cross Section
Motor and
Fan Guard
Screw
Setscrew
Fan
Motor
Shaft
113893-01C