Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > HVAC

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Search this Thread Display Modes
Old 01-06-2013, 02:03 AM   #1
Member
 
Join Date: Jun 2009
Posts: 199
Share |
Default

marine unit popping breaker


hey I have a one and a half ton, Marine unit, water cooled - tripping the breaker. as soon as I cut on the t start the breaker popped. I checked the start capacitor and the run capacitor all was well. I even took out the potential relay and was going to break the start capacitor by hand,but it still tripped the breaker. I check the amperage of the compressor common and got close to 50 amps. so I am assuming the compressor is bad, right? Well that's what I thought too, I replace the compressor, and I'm getting basically the same thing. Before the breaker would pop as soon as the call for heat was there, now I can hear the compressor try to start, and can even see my gauges move a little in the right direction- then it pops the breaker. I ran a wire straight to the common to power and bypass the high pressure switch and low pressure switch, same problem. I'm running out of things to check.

Any clues what this could be or what to check?

wetbar is offline   Reply With Quote
Old 01-06-2013, 06:36 AM   #2
Member
 
Join Date: Jun 2012
Location: Augusta, GA
Posts: 369
Default

marine unit popping breaker


What's the amp draw when it trips?

Could be a stuck/clogged TXV, causing the compressor to be unable to start. Or it could be a bad compressor out of the box - I've had that happen more than once.

scottmcd9999 is offline   Reply With Quote
Old 01-06-2013, 08:15 AM   #3
An old Tradesmen
 
Join Date: Oct 2008
Location: PA
Posts: 24,729
Default

marine unit popping breaker


Always look at the LRA of the compressor before you condemn it as bad because of what looks like high amp draw.

Disconnect wires at compressor and make them safe. Then turn power back on and turn thermostat so unit attempts to run, and see if breaker trips again. Its vbery possible that another component is what is tripping the breaker.
beenthere is offline   Reply With Quote
Old 01-06-2013, 08:58 AM   #4
Member
 
Join Date: Jun 2009
Posts: 199
Default

marine unit popping breaker


it is 50 amps when the breaker pops. when I disconnect the common of the compressor the breaker will not pop then.
wetbar is offline   Reply With Quote
Old 01-06-2013, 09:08 AM   #5
An old Tradesmen
 
Join Date: Oct 2008
Location: PA
Posts: 24,729
Default

marine unit popping breaker


Potential relay could have a short in its coil.
beenthere is offline   Reply With Quote
Old 01-06-2013, 09:09 AM   #6
Member
 
Join Date: Mar 2007
Location: Eighty Four, Pa.15330
Posts: 1,236
Default

marine unit popping breaker


Then it might be a compressor problem.
bobelectric is offline   Reply With Quote
Old 01-06-2013, 09:22 AM   #7
Member
 
Join Date: Jun 2009
Posts: 199
Default

marine unit popping breaker


I even took the potential relay out of the circuit. I checked the amps again because I could not remember if the 50 was this compressor or the other one, it is popping the breaker at 42 amps
wetbar is offline   Reply With Quote
Old 01-06-2013, 09:26 AM   #8
An old Tradesmen
 
Join Date: Oct 2008
Location: PA
Posts: 24,729
Default

marine unit popping breaker


Whats the amp rating of the breaker.

Removing the potential from the circuit doesn't tell you much, since the unit is not operating under normal conditions when you do that, and will draw high amps.
beenthere is offline   Reply With Quote
Old 01-06-2013, 09:31 AM   #9
Member
 
Join Date: Jun 2009
Posts: 199
Default

marine unit popping breaker


the breaker is 30 amps.according to the manual the rla is 14 amps
wetbar is offline   Reply With Quote
Old 01-06-2013, 09:36 AM   #10
An old Tradesmen
 
Join Date: Oct 2008
Location: PA
Posts: 24,729
Default

marine unit popping breaker


Ok. And what is the LRA.
beenthere is offline   Reply With Quote
Old 01-06-2013, 09:39 AM   #11
Member
 
Join Date: Jun 2009
Posts: 199
Default

marine unit popping breaker


it says 75 on the compressor.
wetbar is offline   Reply With Quote
Old 01-06-2013, 09:47 AM   #12
An old Tradesmen
 
Join Date: Oct 2008
Location: PA
Posts: 24,729
Default

marine unit popping breaker


Ok. I would put my leads across the stat cap and see what voltage your getting across it.

Your suppose to hange out the start cap, relay and run cap when you change out a compressor.
beenthere is offline   Reply With Quote
Old 01-06-2013, 10:03 AM   #13
Member
 
Join Date: Jun 2009
Posts: 199
Default

marine unit popping breaker


I did change out the run cap but I was out of the start cap. I did check it and it is 40uf. I will get back to you on the voltage across the capacitor when I can get someone to flip the breaker while I'm down there measuring the car after
wetbar is offline   Reply With Quote
Old 01-06-2013, 10:17 AM   #14
Member
 
Join Date: Jun 2009
Posts: 199
Default

marine unit popping breaker


I am getting .529 volt across the capacitor
wetbar is offline   Reply With Quote
Old 01-06-2013, 11:13 AM   #15
Member
 
Join Date: Jun 2009
Posts: 199
Default

marine unit popping breaker


GOT IT! The freaking wire coming from the run cap had I little bad spot.

wetbar is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
small breaker on ac unit at point where thermostat wiring comes in ovdowg HVAC 2 08-01-2012 07:35 AM
Circuit breaker for an A/C unit hitchh Electrical 12 07-25-2012 05:58 PM
my central a/c heat unit trips my 40 amp breaker after running heat for 5 minutes. buttons1 Electrical 2 12-27-2010 09:23 AM
Breaker keeps popping rickv2009 Electrical 13 01-04-2010 08:54 AM




Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.