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Aafaissal 07-25-2012 11:22 PM

Hvac
 
Condenser motor runs with no call for cooling.changed 2 contactor n still having the same problem. Checked voltage, I am reading 120V on one side,
N nothing on the other side of the contactor. The condenser fan is turning slowly when I plug the disconnect.




I'll appreciate any input.

scottmcd9999 07-26-2012 04:45 AM

Does the motor run okay during a call for cooling?

You should read 120v to ground on BOTH sides of the LINE side of the contactor (the incoming voltage), and you should also read 240v across those lines. You must check both of these - don't assume that you have 240, put your meter on it and check it.

This is often caused by a shorted capacitor. You can also check that with an ohm meter - you should have no continuity to ground between any of the cap terminals.

beenthere 07-26-2012 05:12 AM

Short in the cap, fan motor or compressor.

Aafaissal 07-27-2012 07:42 PM

There's 240v from the disconnect to the contactor. What i'll like to know is why I'm I reading power across the contactor without the coil being energized.
When I call for cooling the unit works fine. Switch it off and the condenser fan keeps running. but slower this time. The unit is 4months old 410a.

McSteve 07-27-2012 07:48 PM

The contactor is only breaking one of the two incoming legs, (single pole contactor) and something is shorted to ground. Very dangerous; the metal parts of the condenser unit are probably live at 120V.

Marty S. 07-27-2012 08:00 PM

Short as stated above. Got to ask though, if the unit is only 4 months old why are you messing with it instead of calling the installers?


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