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  1. #1
    Join Date
    Dec 2009
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    B.C.
    Posts
    26

    2 Door Display Cooler Tripping Breaker!

    Hello,
    Had a service call today, a 2 Door Display Cooler had been tripping the breaker. I took an amp reading and found it to be drawing 12.5 amps, the name plate rating is 11.1 amps. The unit cools and everything seems mechanically sound except it trips the breaker every few days. The customer had the breaker replaced but it still happens. Any suggestions? I hate intermittent problems!

  2. #2
    Join Date
    Jul 2012
    Location
    Richland, WA
    Posts
    248
    Sounds like a ice machine we have at one of the stores, it would run fine for a while then trip the breaker, we replaced the compressor and the problem went away

    Quote Originally Posted by SurreyStevo View Post
    Hello,
    Had a service call today, a 2 Door Display Cooler had been tripping the breaker. I took an amp reading and found it to be drawing 12.5 amps, the name plate rating is 11.1 amps. The unit cools and everything seems mechanically sound except it trips the breaker every few days. The customer had the breaker replaced but it still happens. Any suggestions? I hate intermittent problems!



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  3. #3
    Join Date
    Nov 2006
    Location
    Southeastern Pa
    Posts
    19,300
    Quote Originally Posted by SurreyStevo View Post
    Hello,
    Had a service call today, a 2 Door Display Cooler had been tripping the breaker. I took an amp reading and found it to be drawing 12.5 amps, the name plate rating is 11.1 amps. The unit cools and everything seems mechanically sound except it trips the breaker every few days. The customer had the breaker replaced but it still happens. Any suggestions? I hate intermittent problems!
    My first thought is to check the start components, particularly the relay contacts. You may not be getting full assist on a restart under load.

    Second, what size breaker are we talking about? You can only load a breaker to 80% of its nameplate rating, so a 15 amp breaker can only take a continuous load of 12 amps, 16 amps for a 20 amp breaker.
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  4. #4
    Join Date
    Oct 2011
    Location
    Chicagoland Area
    Posts
    4,764
    A display cooler may also have issues with lighting and door heaters
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  5. #5
    Join Date
    Oct 2012
    Location
    Wisconsin
    Posts
    4,261
    Any chance there is somthing else on the same circuit? If you have somthing else pulling amps, and the compressor goes to start it could make it trip.

    I also agree with the others. The compressor could have a hard time starting once in a while. Especially if it shuts off and tries to come back on again without time to equalize. If so equipped, does the plug and receptacle look ok? Plug could be coming loose in outlet and making compressor rapidly short cycle.

  6. #6
    Join Date
    Jun 2003
    Location
    Chicago, IL
    Posts
    4,538
    check the flexible wires going to the doors.

    check that none of the wiring for the fans or controls is melted to the defrost heaters.

    I have seen weak start capacitors cause random tripping.

  7. #7
    Join Date
    Dec 2009
    Location
    B.C.
    Posts
    26
    I think I figured it out. After burning my arm on the liquid line, yeah the liquid line, I figured that there could be non-condensables in the condenser. I pulled the charge, brazed in an access on the high side and put in some fresh R-134A. The amps dropped from 12.5 down to 10.6. I haven't heard back from the customer......yet. Thanks for the suggestions guys!

  8. #8
    Join Date
    Jan 2007
    Location
    Pittsburgh
    Posts
    181
    mullion heaters ?

  9. #9
    Join Date
    Jan 2009
    Location
    Salisbury, Maryland
    Posts
    146
    Yeah, intermittent problems suck but its most likely tripping for a reason. Had any problems since you pulled charge? Either way I would do like the others said and check your starting components...check run and start cap and make sure the start cap isn't staying in the circuit for too long due to the relay sticking closed. Check the inrush current on the compressor when it starts too. Any history on what was done last? Probably not cause no one seems to know anything when you need the information most hahaha

  10. #10
    Join Date
    Jul 2011
    Location
    Lehigh Valley, PA
    Posts
    471
    Quote Originally Posted by SurreyStevo View Post
    I think I figured it out. After burning my arm on the liquid line, yeah the liquid line, I figured that there could be non-condensables in the condenser. I pulled the charge, brazed in an access on the high side and put in some fresh R-134A. The amps dropped from 12.5 down to 10.6. I haven't heard back from the customer......yet. Thanks for the suggestions guys!
    Was this a closed system with no gauge ports?

  11. #11
    Join Date
    Dec 2009
    Location
    B.C.
    Posts
    26
    The circuit was on a 15 amp breaker, which isn't ideal for this unit. It only had a port on the suction side. Another thing I'd forgot to mention, the compressor's external overload started to trip once it ran for while and got hot. After evacuating the system, it ran a lot cooler.

  12. #12
    Join Date
    Oct 2005
    Location
    B.C. Canada
    Posts
    903
    Quote Originally Posted by Capz View Post
    Was this a closed system with no gauge ports?
    Yah, doubt non condesables on a factory sealed sys..

  13. #13
    Join Date
    Sep 2007
    Location
    Denver , Co.
    Posts
    109
    you gotta wonder with all the China crap coming out
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