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  1. #1

    Hmm Recurring issue on R-22 system

    One of our refrigeration units went down today. When I first got there the unit was pretty hot and I thought it had possibly gone out on thermal. Checked for voltage to the compressor and it was what it was supposed to be. Figured while I let it cool down I would go grab a set of gauges.

    Gauges read around 100psig. I powered it up and the needles in the gauges didn't even shake. Pressure stayed the same. Amp draw was low, but I could feel it vibrating. It just wasn't pumping from what I could tell.

    So I'm pretty sure the compressor is shot. Trick is this compressor was changed out almost exactly a year ago. Anyhow, I'm hesitant to put a new compressor in because I'm bit stumped on what may have caused the problem. We have 4 similar systems running side by side and the other 3 are not having the same issue so I don't believe its an environmental issue.

    Compressor is a 3 phase Copeland, R-22 unit.

  2. #2
    Join Date
    Nov 2006
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    18,533
    Scroll?

    Does it have a label that says "advanced scroll temperature protection?"
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  3. #3
    Join Date
    May 2006
    Location
    Philadelphia, PA
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    1,391
    Were the valves on the manifold closed?

    Is it hermetic? Do you hear an internal relief valve passing?
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  4. #4
    Join Date
    Apr 2012
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    Who put the compressor in ?

  5. #5
    Join Date
    Apr 2012
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    Quote Originally Posted by comfortdoc View Post
    Were the valves on the manifold closed?

    Is it hermetic? Do you hear an internal relief valve passing?

    Low amps.

    Chances are a liquid slug took it out.

  6. #6
    Appreciate all the replies. To answer some of the questions that were posted.

    It is a hermetic compressor put in by a refrigeration company before I was around. Pretty sure they have been using them for a number of years so they must be somewhat professional...

    Link to the exact compressor here
    http://www.johnstonesupply.com/store...odB94-682.html

    I can't hear any internal relief valve or any other leaks, hisses or related noises. Only real noise it makes when powered up is a slight vibration of what I think is the compressor running.

    Anyhow was kinda curious what may have caused it so I can correct the problem before replacing the compressor. So far slugging was mentioned. Any idea's or input on exactly what may be causing it is appreciated.

  7. #7
    One more thing

    The unit is equipped with receiver, accumulator and hot gas bypass.

  8. #8
    Join Date
    Sep 2008
    Location
    Western PA
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    25,659
    Quote Originally Posted by Avid58765 View Post
    Anyhow was kinda curious what may have caused it so I can correct the problem before replacing the compressor. So far slugging was mentioned. Any idea's or input on exactly what may be causing it is appreciated.
    Here's what you do.

    Get the new compressor. Install it properly and restart the unit.

    Now, connect gauges, thermometers and amprobe and pull up a milk crate and wait. Wait until the unit is at temperature and check the charge. Check superheat at the coil and the compressor. Check the operation of the unit's safety switches and operating controls. Check the defrost setup and clock operation.

    In other words, check everything. You'll find it.

    THEN, go back in a few days and check it all over again.

  9. #9
    Join Date
    Jul 2012
    Location
    Southwest
    Posts
    114
    I would probably RX-11 the lines, change the drier, add a suction drier, and change the txv, that way no surprises on start up. Also, replace your safeties and contactor.
    We use a compressor start up sheet to check all the numbers, we rarely ever have one fail again. Our supervisor looks over the start up forms and makes us go back if somethings weird.
    It could have an oil return problem. If the lines are oversized on a split, the velocity could be low, causing the oil to get trapped. Its a split? Could be a restriction, leak, bad safeties/no safeties, acid.
    Accumulator, receiver, its rare to slug the compressor with each of those.

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