Electrical Projects Most models have at least two speeds; a few have three speeds and are electrically reversibw.

The motor is mounted on rubber for quiet operation, and is rated at 120V 60 Hz, and 3A. The troubleshooting and instructions are given for the fan shown in Fig. 5-3, but are generally applicable to fans of this type.



Troubleshooting

If the motor does not run, check the cord set, switch, field, and all connections for continuity. Then check for binding rotor. Of course, you should make certain that the fuse link is not burned out.

Noise or vibration usually points to the blade; check the blade for distortion, breakage, balance, and alignment. Next, check for a loose rotor shaft. Another possible source of noise is loose chips in the field (remove rotor and blow out chips with compressed air). Magnetic hum can be caused by an uneven air gap between the field and rotor. If the field cannot be adjusted to eliminate the hum, a new rotor or complete motor may be necessary.




Disassembly

Lift the front and rear guard assembly out of the holes in the case by flexing the guard out in the middle and in at the top. Remove the snap ring, XF4X796, with external retaining-ring pliers. Now remove the washer, XF3X241, wave washer, XF3X244, and spacer washers, XF3X242 or XF3X243. Lay the fan on its back. Lubricate the rubber hub with alcohol and pull the blade and hub insert, XF4X800, as an assembly from the rotor shaft. Pull the switch knob, XF4X793, and knob retainer, XF4X766, from the switch. Withdraw the switch mounting screw, XF 1X436, and slide the switch out of the case.




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Home > Electrical Projects > Repairs > Window Fans

October 6, 2008