New fan motor overheating?

Old 05-26-10, 02:27 PM
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New fan motor overheating?

First post! (this site is awesome) anyway I have a Trane unit and this past winter I noticed the fan motor wasn't working. After getting sent the wrong capacitor 3x, I just gave in and bought a fairly inexpensive motor that came with it's own cap and I intalled it. It worked fine. Now it's summer and whenever it gets over 80 degrees the fan works for bit and then turns off then starts back up a little while later. I'm figuring that it's overheating since I can move the blades freely and it'll start back up a little while later. The only thing I can see I did wrong was not trim the shaft. Could that extra weight be overworking the motor or do you think the motor is junk? I still have the old motor I can put back in if I can get the right cap but I want to make sure I'm not missing anything easy since I'm stuck in a wheelchair for the next 3 months and it'll be tough switching it out.
Old 05-26-10, 04:05 PM
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The motor you bought is probably not a rated match & therefore is overheating!

Find out what MFD the original motor calls for, you can go with 440-volt even if it calls for 370-volt.

Make sure the fan is installed in its original position.
Old 05-26-10, 06:32 PM
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I agree, your new motor is probably over amping.

If you look at the fan motor FLA on the condenser nomenclature it will be higher than the FLA rating on your motor tag. If you measure the running amperage of your new fan motor, it will be the higher amperage listed on the condenser.

I recommend using an OEM motor or, going up a size. (Though increasing motor size can lower your fan blade into the unit and increase head pressure)

Be sure to remove the drain plug on the bottom of the motorBeer 4U2

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