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  1. #1
    Join Date
    Apr 2011
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    stratford ontario
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    habco esm12 keeps going off on overload

    working on neighbours cooler he uses for beer

    first showed up and compressor not starting and tripping overload
    remove start cap , current relay and overload
    install supco 3 in 1

    unit short cycled with thermostat
    temporary bypass thermostat and test
    unit runs for 1 minute then trips on overload

    remove condensing unit and test on bench next day, unit ran for 15 minutes contious
    re-installed unit and installed electronic refrigeration thermostat

    unit still tripping on overload after 1 minute roughly

    R 134a unit running pressures 25 psi suction, 110 psi discharge

    ohmed out compressor windings and turned out good

    im out of ideas anyone else have anything i have missed ???

    ps i suck at posting please be nice

  2. #2
    Join Date
    Sep 2002
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    Virginia
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    Pressures look fine for a warm box

    Have you performed Amp draw test ?

    Sounds like the compresors been thru hell and probly hurting on the electric part of it

  3. Likes icemeister liked this post
  4. #3
    Join Date
    Jun 2009
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    DFW, TX
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    Common issue is guys use the RCO410 start 3n1 which is for a 1/4hp and has a max amp draw of 7amps. They put it on 1/3hp compressors that draw 7 or 8 amps. After about a minute it trips overload. Look up the max amp draw on the 3n1 you installed and compare. May just have the wrong 3n1 on it. The RCO210 handles up to 1/2hp and will run a higher continuous amp draw.

    Sent from my SAMSUNG-SM-G890A using Tapatalk

  5. #4
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    Sep 2002
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    Those 1/3 ... 1/4 are only good for residential fridges, and barely do those

  6. #5
    Join Date
    Jan 2010
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    Quote Originally Posted by trippintl0 View Post
    The RCO210 handles up to 1/2hp and will run a higher continuous amp draw.
    Maximum RLA 13.3 amps.

  7. #6
    Join Date
    Jul 2000
    Location
    Guayaquil EC
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    Quote Originally Posted by Snapperhead View Post
    Pressures look fine for a warm box

    Have you performed Amp draw test ?

    Sounds like the compresors been thru hell and probly hurting on the electric part of it
    Agreed. I'd suspect a bad overload...especially on these little compressors with low starting torque that many OEMs use these days (ie, no start cap). They don't qualify for commercial duty in my book.

  8. #7
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    Aug 2009
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    Maine
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    Just sort of wondering what the head pressure goes up to just before it kicks out.

  9. #8
    Join Date
    Apr 2011
    Location
    stratford ontario
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    Running Amps measured 4.5,
    110 psi discharge pressure when it runs and kicks out

  10. #9
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    Aug 2009
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    Maine
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    bigger 3 and 1

  11. #10
    Join Date
    Apr 2011
    Location
    stratford ontario
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    Compressor is a techumseh
    Ae 540 ar 277b6

  12. #11
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    Jun 2009
    Location
    DFW, TX
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    Head pressure is low for a normal ambient. Is this in a cold garage? (Edit) ok well maybe not that low. Usually I see 150# head. But that's in a commercial kitchen. (/edit)

    Have you figured out which 3n1 you installed and what it's max amp draw is? 4.5 isn't very much amps, unless you have like the 3n1 for an 1/8hp. The rco810 has max amp draw of 4.05a.

    Sent from my SAMSUNG-SM-G890A using Tapatalk

  13. #12
    Join Date
    Apr 2011
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    stratford ontario
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    R c o 410 is what I used , and wasn't really cold in the garage has electric heater running

  14. #13
    Join Date
    Aug 2002
    Location
    Southold, NY
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    6.8 rating on that model but wouldn't be the first bad out of the box. What was the pump drawing?

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