HVAC compressor tripping breaker immediately

Reply

  #1  
Old 07-31-16, 03:04 PM
S
Member
Thread Starter
Join Date: Jul 2016
Posts: 1
Received 0 Votes on 0 Posts
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.
 
  #2  
Old 07-31-16, 03:51 PM
PJmax's Avatar
Group Moderator
Join Date: Oct 2012
Location: Northern NJ - USA
Posts: 60,824
Received 1,330 Votes on 1,229 Posts
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....
Name:  2014-02-20_161219_harwich-20131230-00070_1.jpg
Views: 247
Size:  28.0 KB
 
  #3  
Old 07-31-16, 11:08 PM
Houston204's Avatar
Forum Topic Moderator
Join Date: Oct 2009
Location: Texas
Posts: 7,425
Received 17 Votes on 14 Posts
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.

Name:  Trane TTB018.jpg
Views: 275
Size:  37.2 KB

Name:  Trane TTB024.jpg
Views: 264
Size:  28.7 KB
 

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

Thread Tools
Search this Thread
 
Ask a Question
Question Title:
Description:
Your question will be posted in: