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Old 04-29-2012, 11:58 AM   #1
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HVAC Condenser FAN Motor hum and won;t start


When I got my AC tune-up done this spring, second unit condenser fan wasn't running. Compressor was running. Little push with a wooden stick to fan made fan started but very slow speed. Tech advised me to get motor replaced as Capacitor is OK. His quote was very high so, I decided to myself. I purchased matching OEM (GE) motor and new Capacitor from Grianger. I had dual capacitor earlier 35/3 and new motor needed 5 MFD, so I replaced capacitor with 35/5 to avoid wiring hassle.
After doing all this situation is still the same. I disconnected Compressor to make sure it is not loading or shorting.
Contactor is pulling in and I cleaned rust from all the contacts.
Connection - Motor Blue - Contactor where Black is coming from Power, Black to Cpacitor - common (common is connected to contactor with red wire) and Brown to cpacitor - FAN.

Kindly advise.

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Old 04-29-2012, 12:36 PM   #2
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HVAC Condenser FAN Motor hum and won;t start


post a picture of the wiring diagram on the side of the motor on the data plate. Sounds like it is not wired properly.

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Old 04-29-2012, 01:27 PM   #3
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HVAC Condenser FAN Motor hum and won;t start


Thanks, for looking in to it...uploaded file but not sure, so copy paste picture below..
HVAC Condenser FAN Motor hum and won;t start-motor-plate.jpg
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Old 04-29-2012, 01:29 PM   #4
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HVAC Condenser FAN Motor hum and won;t start


You are right hvtech126, I swapped Blue and Black Wire. Motor is running OK but in opposite direction. How do I change direction of motor ?

Last edited by bcjoshi; 04-29-2012 at 01:43 PM.
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Old 04-29-2012, 01:46 PM   #5
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HVAC Condenser FAN Motor hum and won;t start


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Originally Posted by bcjoshi View Post
You are right hvtech126, I swapped Blue and Black Wire. Motor is running OK but in opposite direction. How do I change direction of motor ?
It appears you cant.. it is not a reversable motor... unless you flip stator around..which I would not recommend trying...
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Old 04-29-2012, 01:48 PM   #6
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HVAC Condenser FAN Motor hum and won;t start


Thanks a lot, I will have to return this motor and get new one which runs in opposite direction.
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Old 04-29-2012, 01:49 PM   #7
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HVAC Condenser FAN Motor hum and won;t start


some motors have external leads that you can switch to reverse them..it appears the motor you have is designed for the direction the arrow is pointing....
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Old 04-29-2012, 01:52 PM   #8
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HVAC Condenser FAN Motor hum and won;t start


I just saw in Grainger web site , it is Counter Clockwise. So, I need to buy a motor which runs clockwise.

What if I reverse FAN blades, it should serve the purpose. It is sucking air instead of blowing and reversing fan will change air flow direction. No ?
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Old 04-29-2012, 01:56 PM   #9
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HVAC Condenser FAN Motor hum and won;t start


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Originally Posted by bcjoshi View Post
I just saw in Grainger web site , it is Counter Clockwise. So, I need to buy a motor which runs clockwise.

What if I reverse FAN blades, it should serve the purpose. It is sucking air instead of blowing and reversing fan will change air flow direction. No ?
depends on your unit..most condensing units draw air through the condenser and then out the top.. the air has to go the way the unit was designed.....
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Old 04-29-2012, 02:11 PM   #10
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HVAC Condenser FAN Motor hum and won;t start


Yes, it is supposed to draw air thro' condenser and out from center to top. But due to it's rotation it is doing opposite.

I can't find a motor which will run clockwise. Original motor was
GE 5KCP29ECA091AS. (1/10HP,208-230V, .75A< 1080 RPM, 60HZ, NEMA 42)

What I got now is GE 5KCP29CCA341S, with same specification but running in opposite direction.
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Old 04-29-2012, 02:18 PM   #11
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it should be easy to find a motor that is reversable...
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Old 04-29-2012, 03:25 PM   #12
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HVAC Condenser FAN Motor hum and won;t start


Reverse the blue and brown wires from the motor that attach to the capacitor. It will run the opposite direction then.
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Old 04-29-2012, 03:41 PM   #13
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you could be right been... most motors I see here in Canada with a diectional arrow are not reversable... would not be the first or last time I was wrong...
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Old 04-29-2012, 03:45 PM   #14
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HVAC Condenser FAN Motor hum and won;t start


Quote:
Originally Posted by carmon View Post
you could be right been... most motors I see here in Canada with a diectional arrow are not reversable... would not be the first or last time I was wrong...
All PSC motors that are a 3 wire set up can be reversed by changing weather the aux winding or the common winding have the phase thrown off.

So just changing which 2 motor wires are where on the cap will change rotation.

If its a 4 wire PSC, then it doesn't matter whcih wires are where on the cap, rotation will be the same.
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Old 04-29-2012, 03:47 PM   #15
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HVAC Condenser FAN Motor hum and won;t start


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All PSC motors that are a 3 wire set up can be reversed by changing weather the aux winding or the common winding have the phase thrown off.
really.... I am at shop now ... gonna try it right away....

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