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  1. #1
    Join Date
    May 2005

    Very high superheat value

    I'm seeing superheat around 60 and subcool around 18. This is a 4 ton water-air unit, and according to my unit's charts the high side pressure is low in all modes but especially during heating. Am I looking at low charge or bad TXV or both?

  2. #2
    Join Date
    Jul 2009
    Columbia, MD
    could be a measurement error. try adjusting the txv valve counter clockwise to decrease your superheat, then recheck both SC and SH

  3. #3
    Join Date
    May 2009
    central ohio
    what freeon is it it does sound like txv issue but u will need to make sure that heat transfer in evap is ok or the reading u r taking will not b accurate

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