3a

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1. Window Fans
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. Remove the switch bag, XF4X636, disconnect all leads, and remove the switch. Remove the connector, XF4X613. Pull the strain relief, XF4X778, from the case and remove the cord set. Next remove the lead clips, XF4X769 and XF4X795. Withdraw the two motor mounting screws, XF 1X406, and remove the complete motor assembly from the case. Pull the motor cover, XF35X85, from the motor. Pierce the expansion plug off center with a sharp-pointed tool and pry off the expansion plug, XF4X213. Remove the felt wick, XF4X588, C clip, XF4X173, washers. Sand the rotor shaft lightly with crocus cloth to remove any nicks or burrs; and remove the rotor, XF29X67, from the front of the field and frame assembly. Reassembly and Repair Reverse the disassembly procedure. Always replace the expansion plug by holding it in place and expanding it with a short section of Vfc" or %" rod with a slightly rounded end. Seal with oil-seal compound. Before assembling the switch to the case, the plastic bag, XF4X636, must be placed over the switch leads and connectors and the bag twisted around the leads and secured with electrical tape. To insure proper installation of the blade, the following procedure must be used: a.  The rubber hub insert must be soaked in alcohol and then placed in the blade. b. The blade and hub insert are then immediately (before the alcohol dries) pushed onto the shaft using a rocking motion on the blade hub. This allows the rubber hub insert to contract and maintain even wall thickness between the shaft and the blade. NOTE: The blade-hub insert may be properly oriented to lock the fins of the rotor. c.  The fiber washer, wave washer, steel washer, and retaining clips are then placed on the armature shaft to hold the blade in place. Lubrication The wicks in the forward part of the motor should contain 3.7 cc of SAE 30 MOTOR OIL. The felt in the rear cavity should contain 6.3 cc of SAE 30 MOTOR OIL. When reassembling the rotor, lubricate the shaft with a light film of SAE 30 MOTOR OIL. Figure 5-4 illustrates schematically a three-speed motor with a reversing switch. Depending upon the position of the in-out switch, either the wire marked "CC" or the wire marked "CW" is given a return path from the connection of the two motor windings, through the switch, and back to the appropriate winding. Final Test Test at 1100V for 1 second while the motor is warm and the switch is on. Check the wattage with the unit plugged into 120V ac outlet. The fan should start from a horizontal position when plugged into a 103V power supply. Observe the blade while the fan is running to make sure it is true and in balance. Make certain the reversing switch is installed properly. With the switch in, the blade must turn clockwise when the operator is facing the front of the fan (blade side of the motor). Use Glyptal to hold the reversing switch knob if the fit is loose on the switch.
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