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TSLG
New Orleans Saints Fan
Member since Mar 2014
5096 posts
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HVAC experts: shorted compressor
Do we have any hvac experts? I seem to have a shorted compressor on an older unit.

On two of the three terminals, I appear to have continuity to ground, and the system throws the breaker immediately upon turning on.

The compressor is a copeland zr45kc-pfv-135.

Also, the a-coil was updated years ago to accept the new refrigerant, so I'm guessing i can go with old or new.

What do I need to do?

***I'm not good with electrical, but I was confused about getting continuity between the two hot wires running to the compressor. The small wire going to the capacitor was fine, but the other two wires that came from the contactor showed continuity between each other.


Hamma1122
Member since Sep 2016
14389 posts

re: HVAC experts: shorted compressor
Change out condenser
This post was edited on 9/14 at 3:23 pm


Unobtanium
LSU Fan
Baton Rouge
Member since Nov 2009
1015 posts
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re: HVAC experts: shorted compressor
What you're seeing is the resistance of the motor windings OR a shorted winding, depending on the resistance value.

Check from each motor leg to ground - that should be an open circuit. If it's anything but then your motor windings are shorted to ground.


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CrawDude
LSU Fan
Baton Rouge
Member since Apr 2019
3431 posts
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re: HVAC experts: shorted compressor
No HVAC expert but this video might help you verify if you have a grounded compressor that is instantly tripping the breaker if you have the appropriate multimeter. Troubleshoot a Grounded Compressor .

If so and you have a a R-22 and R-410 compatible evaporator coil as you indicated you should be able to switch from R-22 refrigerant to R-410A with a new compressor or condensing unit. Depending on the age of the system, you might find it better to replace the entire condensing unit for a little more $ than just the compressor.

I believe this one area it’s best to have an experienced HVAC tech diagnose it for you.
This post was edited on 9/14 at 5:31 pm


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fightin tigers
Downtown Prairieville
Member since Mar 2008
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re: HVAC experts: shorted compressor
quote:

Change out condenser



Could just change out the compressor. Probably a lot cheaper.


Hamma1122
Member since Sep 2016
14389 posts

re: HVAC experts: shorted compressor
You can fix it the RIGHT way or the Cheap way


fightin tigers
Downtown Prairieville
Member since Mar 2008
60864 posts
 Online 

re: HVAC experts: shorted compressor
quote:

You can fix it the RIGHT way or the Cheap way


If nothing is wrong with the condensor then you can just replace the conpressor.

It's not cheap, it's just how it is done.

If the fan motor goes out you wouldn't change the whole condensor.
This post was edited on 9/14 at 7:48 pm


Hamma1122
Member since Sep 2016
14389 posts

re: HVAC experts: shorted compressor
Clueless!! Change compressor in a 12 year old unit probably. Do you bro


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jmkidder
LSU Fan
lafayette
Member since Sep 2005
403 posts

re: HVAC experts: shorted compressor
New condenser


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