HVAC compressor tripping breaker immediately

Old 07-31-16, 03:04 PM
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HVAC compressor tripping breaker immediately

I have a Trane XB1000. Handles the 2nd floor studio.

Runs on two single pole 15Amp Square D breakers.

Thermostat is sending 24 volt signal to the contractor. Contractor contacts look burnt but it is closing.

Compressor Ohm values are:

Common to run = 1.8
Common to start = 4.7
Run + Start = 6.4

All leads to ground are infinite/OL.

Capacitor just replaced. Old one Read good on meter. But had small bulge beginning. So replaced it

Compressor Fan seemed to be running slow befor I started digging deep into this.

Thermal cut off in compressor ? It's been very hot here --

I'm not a professional but pretty well versed in electrical items.

Any help is most welcome.
Old 07-31-16, 03:51 PM
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Welcome to the forums.

It should technically be on a two pole breaker..... not two singles.
15A is kind of low for a compressor unit.
Your ohms values for the compressor look ok.

There will be a tag on the condensor with system parameters on it like volts, amps, minimum circuit, maximum protection, etc.

Can you post a picture of it ? http://www.doityourself.com/forum/el...-pictures.html

Tag will look something like....
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Old 07-31-16, 11:08 PM
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I have seen the crank case heater short out and trip the breaker on old Trane units.

If it has a crank case heater you might see if the breaker trip if you unplug the 2 wires feeding the crank case heater. I don't see one factory installed in the manual that I downloaded.


15 amps is small if this is more than 18,000 btu.

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Last edited by Houston204; 07-31-16 at 11:35 PM.

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