Desa Air Conditioner owner manual Service Procedures, Motor, Fan

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.

Motor and

Fan Guard

Screw

Screw

Figure 5 - Removing Motor and Fan Guard from Heater (Heater may vary from illustration)

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).

Fan Setscrew

	Motor Shaft
Figure 6 - Fan, Motor Shaft and Setscrew
	Location
Hub	Fan

Setscrew	Motor
	Shaft
Figure 7 - Fan Cross Section

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