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  1. #1
    Join Date
    Jul 2005
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    I think i have read that superheat should run around 30*.
    I check the charge on my new unit last night and the direction for charging by superheat. Hears my question
    Why is it that newer units superheat runs lower then then the 30* that I think I have read?
    thanks txg.

    As for my unit the OAT=76*,RA=70*,SP=73psi,st=56*,and last sat.suction temp=42* which gives me a 12* superheat, chart called for 10* superheat.

  2. #2
    Join Date
    Feb 2005
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    You may have read wrong? :-)

  3. #3
    Join Date
    Oct 2004
    Tyler, TX
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    Long list.

    Here's a few...

    Wrong charge, coil, ductwork, filter, air handler, metering device, equipment, to name a few.

    Could be any one of the above, more than one of the above, or none of the above.

    Happy hunting.

    [Edited by bwal2 on 09-09-2005 at 10:13 AM]
    RSES Certificate Member Specialist

    Southwest Regional Association of RSES Secretary, 2017

  4. #4
    Join Date
    Sep 2001
    Vancouver Canada
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    superheat requirments will change with load on the unit, where did you read that you needed 30 degrees superheat? Seems a bit high to me. Also from the looks of your calculations you are actually running 14 dgs sheat and not 12.
    "Go big or Go Home"

  5. #5
    Join Date
    Jul 2003
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    Originally posted by Black Adder
    Also from the looks of your calculations you are actually running 14 dgs sheat and not 12.
    which may be good for your system depending on all the factors stated above.
    "ok, everyone just calm down."

  6. #6
    Join Date
    Nov 2000
    Eastern PA
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    Not sure what you are calling superheat. The only time Goodman chart states 30º superheat is if the return air temperature is 75º and the ambient temperature is 60º, which is not a very good time to be checking system charge.

    I think you may have some terminology misapplied., and ye shall find;..
    So always seek the Truth, not just what you want to believe to be true…
    Ecclesiastes 10:2 NIV

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