HVAC Condenser FAN Motor hum and won;t start

bcjoshi

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

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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bcjoshi

Thanks, for looking in to it...uploaded file but not sure, so copy paste picture below..

bcjoshi

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

It appears you cant.. it is not a reversable motor... unless you flip stator around..which I would not recommend trying...

bcjoshi

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

carmon

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....

bcjoshi

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

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.....

bcjoshi

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

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

beenthere

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

carmon

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

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

really.... I am at shop now ... gonna try it right away....