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  1. #1
    Join Date
    May 2013
    Posts
    47

    Over heated compressor

    Having problems with new condensing unit for walk in freezer.
    Compressor over heating after about two hours of run time. Copeland compressor with Coresens. Anyone familiar with this?

  2. #2
    Join Date
    May 2013
    Posts
    47
    Suction running at 18 psi, liquid at 235, Discharge temp at compressor 180. Super heat at compressor 30. 404a

  3. #3
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,386

  4. #4
    Join Date
    Jul 2011
    Location
    Lehigh Valley, PA
    Posts
    427
    I'd be checking the refrigerant level, sounds low unless it is winter where you are at.

  5. #5
    Join Date
    May 2013
    Posts
    47
    New condenser just installed. Full charge. Full sight glass at condenser and good suction gas coming ball. Does anyone know what the temp maximum discharge can be? And still operate properly?

  6. #6
    Join Date
    Oct 2004
    Location
    Central WA
    Posts
    1,468
    ROT for max discharge temp is 225 degrees at 6" from compressor. 180 is just fine. How's your voltage? How's your amps vs RLA? Is your compressor staying on during defrost and running with heaters?

  7. #7
    Join Date
    Sep 2002
    Posts
    12,195
    What is the subcooling at the condenser outlet?
    What is the subcooling at the TXV inlet?
    What is the suction superheat at the evap outlet
    What is the suction superheat at the compressor inlet?

    On air cooled - 100 discharge superheat wouldn't scare me very much.

    Tell me the other answers.

    PHM
    -------




    Quote Originally Posted by Rheeman View Post
    New condenser just installed. Full charge. Full sight glass at condenser and good suction gas coming ball. Does anyone know what the temp maximum discharge can be? And still operate properly?
    PHM
    --------
    The conventional view serves to protect us from the painful job of thinking.

  8. #8
    Join Date
    Mar 2006
    Posts
    1,025
    I definitely check your defrost heaters. make sure they're not energized while the compressor is running, or just energizing at random times.

  9. #9
    Join Date
    May 2013
    Posts
    47
    No defrost heaters on during operation. RLA is 40 amps on name plate. Compressor was pulling 40 amps at start up then dropped to 36 amp after temp began to drop. Voltage is 210.
    This unit has Copland core sense controler on it. Does anyone know what temp the over load opens at? Heatcraft is closed for te holiday weekend so can't call for tech help.

  10. #10
    Join Date
    Sep 2002
    Location
    Virginia
    Posts
    3,075
    is this 3 phase ? if so , swap 2 wires and see if that helps

  11. #11
    Join Date
    May 2013
    Posts
    47
    Yes it is three phase. Problem solved today. Looks like Copeland Discus Coresense controller was bad out of the box. Control was saying "motor over heated" but was not even warm. Control eventually quit over night and would do nothing. Talked to suppler, who talked to Copeland and they said to bypass control till replacement arrives.

  12. #12
    Join Date
    Jun 2013
    Location
    NORTHERN
    Posts
    989
    Seems knowing "hot gas superheat" range, line to gauge, just another indicator 6" out as CJP notes- has helped me in pinches without other input as PHM describes to get.

    ie)
    r22 in a particular can, particular range settled out, 55*-or so, is like that of 410a at 45- or so... IF other things can not be practical/timely... (blend may be off in its composition, too, though)

    any helps?:
    Emerson ~

    http://www.emersonclimate.com/en-us/...echnology.aspx

  13. #13
    Join Date
    May 2013
    Posts
    47
    Hot gas super heat? Never heard that term before. and how would you know that range?

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