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-   -   HVAC Condenser FAN Motor hum and won;t start (http://www.diychatroom.com/f17/hvac-condenser-fan-motor-hum-won-t-start-141980/)

bcjoshi 04-29-2012 12:58 PM

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.

hvactech126 04-29-2012 01:36 PM

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

bcjoshi 04-29-2012 02:27 PM

1 Attachment(s)
Thanks, for looking in to it...uploaded file but not sure, so copy paste picture below..
Attachment 50039

bcjoshi 04-29-2012 02:29 PM

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 ?

carmon 04-29-2012 02:46 PM

Quote:

Originally Posted by bcjoshi (Post 910213)
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...:(

bcjoshi 04-29-2012 02:48 PM

Thanks a lot, I will have to return this motor and get new one which runs in opposite direction.

carmon 04-29-2012 02:49 PM

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....:thumbup:

bcjoshi 04-29-2012 02:52 PM

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 ?

carmon 04-29-2012 02:56 PM

Quote:

Originally Posted by bcjoshi (Post 910235)
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.....:thumbup:

bcjoshi 04-29-2012 03:11 PM

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.

carmon 04-29-2012 03:18 PM

it should be easy to find a motor that is reversable... :eek:

beenthere 04-29-2012 04:25 PM

Reverse the blue and brown wires from the motor that attach to the capacitor. It will run the opposite direction then.

carmon 04-29-2012 04:41 PM

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...:)

beenthere 04-29-2012 04:45 PM

Quote:

Originally Posted by carmon (Post 910298)
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.

carmon 04-29-2012 04:47 PM

Quote:

Originally Posted by beenthere (Post 910302)
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....:eek:


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