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103908-01E 7
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)
(4.5192-5.649 N•m).
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 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 (see Figure 5, page 6).
17. Attach black and white wires to terminal board
(see Wiring Diagram, page 13, for correct
locations).
18. Replace base tray.
FAN
1 Remove motor, motor mount, and fan (see
Motor, page 6, 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 8).
5. Place setscrew on flat of shaft. Tighten set
-
screw firmly (40-50 inch-pounds) (4.5192-
5.649 N•m).
6. Place motor, motor mount, and fan guard
into rear of heater shell (see
Motor, steps 14
through 18).
Figure 7 - Replacing Motor, Motor Mount,
and Fan Guard into Heater
Hole in Shell for
Motor Wires
SERVICE PROCEDURES
Continued
Figure 9 - Fan Cross Section
Figure 8 - Fan, Motor Shaft, and
Setscrew Location
Setscrew
Motor
Shaft
Fan
Setscrew
Fan
Hub
Motor Shaft