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Turn the electricity to the air conditioning unit off at the service disconnect box. Follow the wires from the AC unit to the disconnect box, usually located next to the unit. Open the disconnect box and, depending on the type, either pull the buss-bar or flip the disconnect switch.
Open the air handler\'s access panels with the correct size of nut driver, usually 5/16- or 1/4-inch. Save the screws.
Remove the control panel\'s cover, if equipped, with a nut driver. Some models have a flat metal cover over the electronic controls, and some control panels butt up to the unit\'s access cover. Save the screws and access cover.
Follow the wires from the blower motor. Two wires will go to a capacitor located on the blower\'s housing. The rest of the wires will go to the control panel.
Cut the wires leading into the control panel with wire cutters. Leave the cut wires connected inside of the control panel.
Remove the retaining bolts with either a nut driver, usually 3/8-inch, or an adjustable wrench. The retaining bolts, found on the mounting brackets that the blower\'s housing slides on, keep the blower\'s housing locked into position. Save the bolts.
Slide the blower motor\'s housing out of the AC unit. The housing will slide straight out along the mounting brackets.
Disconnect the two wires going to the capacitor. They will pull straight off the capacitor\'s terminals.
Unscrew the squirrel cage\'s locking-screw with an adjustable wrench. The squirrel cage, the bladed wheel, connects to the blower motor\'s shaft inside of the housing. The locking screw holds the squirrel cage to the shaft.
Unscrew the blower motor\'s mounting screws with either a nut driver, usually 3/8-inch, or an adjustable wrench. These screws hold the motor to the housing and are found on the opposite side of the squirrel cage, the same side that the wires leave the motor.
Pull the motor from the housing. A drop of oil on the shaft will aid in removal. If the squirrel cage sticks to the shaft, then hold the shaft still with an adjustable wrench while spinning the squirrel cage on the shaft.
Slide the new blower motor into the housing. The blower motor\'s shaft will slide into the squirrel cage\'s hole.
Tighten the blower motor\'s mounting screws.
Spin the blower motor\'s shaft until the flat part of the shaft lines up with the squirrel cage\'s locking screw. Move the squirrel cage in or out until it does not touch the housing or the blower motor. Tighten the locking screw.
Connect the blower motor\'s capacitor wires, usually brown or brown with white stripes, to the capacitor. Direct replacement motors use the same color-coded wires as the original.
Slide the blower motor\'s housing into the AC unit along the mounting brackets. Install the mounting bracket\'s retaining bolts.
Connect the new blower motor\'s wires in the control panel one at a time. Disconnect one old wire in the control panel. Determine its color and connect the new wire, of the same color, to its place. Do this for all wires.
Replace the control panel\'s cover, if equipped, and the unit\'s access cover. Turn on the power to the unit at the disconnect box and test the blower motor.
You may have to remove the complete blower assembly, remove any dead squirrels, and take it around to various appliance parts suppliers to obtain a suitable replacement. You may need only a replacement motor if the squirrel cage is intact
Hello, air conditioners will freeze either due to low airflow.....such as dirty filter, dirty evaporator coil, weak or not running blower motor. Also, a low refrigerant charge can cause the unit to freeze up.
If you are planning to replace the shaft;
if your able to loosen the 2 square headed bolts( which must be done to allow for shaft movement) do so, then after bearings and pulley are off emerycloth (smooth no burrs or rust) the shafts 2 ends and get grinder and cut thru the shaft on the inside of squirrel cage area as close to the edge of cage as possible drive the shortened pieces of the shaft inward( oil this pieces to help ease movement thru blower wheel) until they are removed replace shaft with new shaft and re-install parts and or replace as needed bearings and blower wheel. I am getting ready to do this very job myself ( take measurements of shaft on each side to ensure your back where you started when done)
Hello, I had the same problem and replaced the Centrifugal motor which still did not fix the problem. It turned out to be the squirrel cage that the Centrifugal motor turns. It was sticking on the rubber gasket between the motor and the squirrel cage/housing assembly. I loosened the set screw that holds the cage on the shaft and moved the cage up 1/8th of an inch and it solved the problem.
Absolutely should be positively "locked" to the motor shaft. There should be a set screw in the collar of the squirrel cage mount. Either it is missing of has loosened. Please tighten (or replace) this set screw. Also, it is very IMPORTANT to make sure that if there is a flat machined surface on the motor shaft, that you align the squirrel cage (and set screw) so that the set screw will seat firmly and squarely against this flat surface. This design ensures that once properly aligned and set, that the squirrel cage will follow the motor shaft faithfully. Also, it is recommmended to apply some thread sealant (Locktite) to the threads of the set screw so this will not happen in the future. Vibration can be the cause of this.
sounds as if fan isnt attached to motor shaft. There is a set screw on the fan cage that if it loosens the shaft will turn inside of the fan not turning the fan( also known as a squirrel cage) You need to get access to the fan motor and see first if its shaft is rotating, if it is see if the squirrel cage is turning if not the set screw located on the inner collar of the squirrel cage needs to be tightened. Thie set screw is more than likly an allen set screw.