HVAC compressor tripping breaker immediately
#1
07-31-16, 02:04 PM
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.
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.
#2
07-31-16, 02:51 PM
Group Moderator
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....
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....
#3
07-31-16, 10:08 PM
Forum Topic Moderator
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.
https://www.google.com/url?sa=t&rct=...28617741,d.eWE
15 amps is small if this is more than 18,000 btu.
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.
https://www.google.com/url?sa=t&rct=...28617741,d.eWE
15 amps is small if this is more than 18,000 btu.
Last edited by Houston204; 07-31-16 at 10:35 PM.
