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  1. #1
    Join Date
    Jan 2008
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    McQuay Machine Charge

    Co-worker is on a PEH126JB, s/n 5RB0300100, fixing leaks. Anyone got machine refrigerant charge? Converted to R-134a, believe to be 1700#. Any help would be appreciated.

  2. #2
    Join Date
    Jul 2009
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    In a mechanical room....
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    Why trust charge instead of superheat and subcooling esp if it is a retro?

  3. #3
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    Jan 2008
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    i understand how to charge a machine. he's on a quoted job which has to be closed out, and with the temps now, he won't be able to wind her up.
    also - the original tags were removed, new tags don't state amount.

  4. #4
    Join Date
    Jul 2009
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    In a mechanical room....
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    I knew you wouldn't ask a question like that unless you had a good reason lol. I do not have the answer to your question, however my office in fl is across the street from mcquays office I can toilet paper their office if they can't answer your question for ya.

  5. #5
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  6. #6
    Join Date
    May 2001
    Location
    Western Wa
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    1,864
    If the conversion was done by McQuay Service, there would probably be a record of the engineering process, in the Staunton office. Many also included a gear ratio change.

    At least, you could get the original R-12 charge, and then guess pretty close from there.
    God Bless our Veterans

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  7. #7
    Join Date
    Jan 2008
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    windy city
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    Quote Originally Posted by Randy S. View Post
    If the conversion was done by McQuay Service, there would probably be a record of the engineering process, in the Staunton office. Many also included a gear ratio change.

    At least, you could get the original R-12 charge, and then guess pretty close from there.
    The way i got it from my dispatcher was the tech was in touch with the factory, and that conversation didn't 'work out' too good. I was asked if i can find out. (I have a mountain of paper, and you gentlemen). Thought there mite be someone out there with a 'cheat' sheet.
    I don't know what was upgraded on the conversion.
    But anyways, thank you all for the responses.

  8. #8
    Join Date
    Jul 2006
    Location
    The Great country of Texas
    Posts
    429
    I did many McQuay conversions and the charge usually was 20% more than the R-12 charge. Put the thing at full load, make sure you have 6-12 degrees of subcooling, check the discharge superheat without the liquid injection on, should have 15% DGSH at full load with good subcooling.
    Adjust the TXV pilot valve accordingly to achive.
    "I'm from Texas, what country are you from?"

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