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  1. #1
    Join Date
    Jan 2007
    Location
    USA
    Age
    52
    Posts
    145
    Rep Power
    11

    Oil logging in subcooler



    This is a new supermarket. Low temp recirc CO2 and 407A on the top cycle. We are finding that oil is logging in the heat exchanger. The service company goes out and drains about a half gallon of oil from the angle valve located at the bottom of the plate exchanger. Engineers are still trying to solve. We are using two exchangers and run both. We shut down one at midnite with an eev and an hour later shut the other down. Not sure if that has anything to do with it. I wouldnt think so. Any ideas? Thanks



  2. #2
    Join Date
    Dec 2007
    Location
    australia
    Posts
    2,418
    Rep Power
    26

    Re: Oil logging in subcooler

    Joe,
    Probably need a bit more detail as to how system is piped up etc.
    As the heading says subcooler?

  3. #3
    Join Date
    Mar 2009
    Location
    U.S.A.
    Posts
    300
    Rep Power
    12

    Re: Oil logging in subcooler

    Sounds like low load on the cascade interchanger presumably on the R-407 Side; so Oil is a misnomer? These envelope or gasketed plates or?

  4. #4
    Join Date
    May 2007
    Location
    Auckland
    Age
    67
    Posts
    3,362
    Rep Power
    31

    Re: Oil logging in subcooler

    Hi Joe,
    you need to keep the oil in the compressor circuit with improved oil separation.

  5. #5
    Join Date
    Jan 2007
    Location
    USA
    Age
    52
    Posts
    145
    Rep Power
    11

    Re: Oil logging in subcooler

    Turns out electronic expansion valves were wrong size on subcooler.

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