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Thread: Zero Superheat

  1. #21
    Join Date
    May 2018
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    Central Florida
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    My guess would be low airflow and someone added charge watching pressure only and not watching superheat.

    Make sure the coils and blower wheel are clean, dial in the airflow as well as you can, recover weigh the refrigerant back in and try to hit target superheat.

    I doubt even a mixed gas would result in zero degrees superheat.

  2. #22
    Join Date
    Jun 2001
    Location
    San Diego, CA
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    Fixed metering 407 not good. See if you can TXV this beast. Best to slightly undercharge. Get that suction temp up

  3. #23
    Join Date
    Aug 2016
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    Thread Starter
    Quote Originally Posted by gbfromsd View Post
    Fixed metering 407 not good. See if you can TXV this beast. Best to slightly undercharge. Get that suction temp up
    Had to recover 4 pounds of refrigerant to get the proper superheat! This is what happens when technicians are careless and charge a system by evaporator temp and beer can cold suction line!!

  4. #24
    Join Date
    Aug 2008
    Location
    Hibbing, MN
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    As others have said, I suspect you dont have enough air going across the indoor coil. On calls like this, you always start with two clean coils and good air flow across both.

    After that, you can take readings and continue (maybe) with a diagnosis. Just a good cleaning might solve everything.
    If God didn't want us to eat animals... He wouldn't have made them out of MEAT.

  5. #25
    Join Date
    Mar 2015
    Location
    Tx
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    Quote Originally Posted by TechmanTerry View Post
    I still have 1 yellow cylinder,full.
    Don't let the IRS know as they will demand the inventory taxes on CFC's, the folks at the IRS learned a lot from Hitler's Gestopo

  6. #26
    Join Date
    Oct 2009
    Location
    Atlanta,Ga.
    Posts
    728
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    I have half a drum of R500.Can is all beat up.

  7. #27
    Join Date
    Aug 2002
    Location
    Southold, NY
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    32,891
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    Quote Originally Posted by oldguy1949 View Post
    Don't let the IRS know as they will demand the inventory taxes on CFC's, the folks at the IRS learned a lot from Hitler's Gestopo
    It must have leaked out

  8. #28
    Join Date
    Apr 2020
    Location
    Garner NC
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    3,553
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    Quote Originally Posted by CEAS-AC-TECH View Post
    Fixed
    Sc 19.5

    Sent from my LM-G820 using Tapatalk
    What is the manufacturer suggesting the subcool is supposed to be. High subcool is typical of a restriction somewhere. A kinked line can do that, restriction in filter dryer, piston undersized/partial clog..etc.

    Its possible the piston was changed to match the other refrigerant and its smaller, or nitrogen was not used when welding and its clogged

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