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JWulf1092 09-21-2012 02:43 PM

Replacing Ac Compressor Fan motor f48k89a01
 
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I have an AC unit with a ground floor outside compressor.
The AC is not working today, so I go to look.
60Amp breaker is not tripped. So I trip it for safe inspection of the compressor.
Fan on the compressor is not spinning. but is VERY hot, I can leave my hand on the top of the compressor unit where the fan is bolted in for about 2-3 seconds. I Pull the fan and top housing off and the motor spins freely but is VERY hot. I open up the hatch on the side and I find a small little device that is humming. I find a wire I can remove to stop the humming. (Pic attached)
I am assuming the fan is bad and needs to be replaced. Is my assumption correct, or is there something else i should be testing first?
Thanks for all who provide constructive assistance!

JWulf1092 09-21-2012 02:58 PM

UPDATE: Directly after posting this, I went out, put everything back together, turned the breaker on, and viola, the compressor started with the fan spinning. So it appears the motor is not bad, possibly the capacitor? The smaller capacitor to the lower right, has been changed multiple times in the last 4 years I have had the system.

qbert 09-21-2012 04:08 PM

i would watch it it may go out on thermal again.

JJboy 09-21-2012 06:24 PM

Check both capacitors the aluminum body

JWulf1092 09-21-2012 07:49 PM

Qbert: It has not yet, but i will keep my eye on it. When you say go out on thermal, are you thinking that the motor is overheating and going out, or what???

JJboy: I don't have a way to check the capacitors. I was told expensive meter to properly do that...???

JJboy 09-21-2012 08:09 PM

Any meter with MFD feature. :thumbsup:

JWulf1092 09-22-2012 04:13 AM

UPDATE:
This evening when i got home the motor was making a high pitched noise and not spinning and very hot again.
Pulled the breaker. At this point I am a half hour into the cool down, motor still very hot. Turned the breaker on for a moment, the compressor came on, but not the fan, immediately turned the breaker off.

JJboy: I do not have a meter with MFD feature.Should i just replace the small capacitor? That is the one on the lower right of the picture. It has been replaced multiple times in the 4 years I have had this house.

beenthere 09-22-2012 08:09 AM

Try just replacing the capacitor, if it still over heats/stops running, then you probably need a new motor.

JWulf1092 09-22-2012 11:13 AM

Beemthere: Just the little small one correct? I am calling around now to find a comparable, or better quality replacement. It is a Saturday though...

beenthere 09-22-2012 11:15 AM

Ya, the small one only.

JWulf1092 09-28-2012 11:25 PM

Ok, I replaced the capacitor. Got a used one from a client who is mgr for a large HVAC company in town. Same specs. Everything goes good for the last week, and now same issue. The but now the fan won't spin up at all. It will free spin no problem, and it looks like it wants to when I supply power as the fan moves an inch, and if I try to spin the blade while under power, it will move a half rotation or so, but then it stops. Once I kill the power the fan blade will freely spin again.
So I assume I need to replace the fan motor?


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