Low superheat normal subcooling 2.5 ton txv ? - Page 2
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  1. #14
    Join Date
    Sep 2002
    Location
    Virginia
    Posts
    3,025
    you didnt install it backwards didya ...

  2. #15
    Join Date
    Apr 2012
    Location
    Paper Street Soap Company
    Posts
    2,298
    I would be concerned to if a new install is running with zero superheat.

    Liquid refrigerant is most likely making it back to the compressor. If its not causing damage by way of slugging its washing the oil and eventually you'll experience bearing failure.

    Its hard to believe you have any liquid seal with a Txv wide open. If you've confirmed your readings are correct and there is no adjsutment on that TXV then your only option is to replace it.

  3. #16
    Join Date
    Jun 2012
    Location
    Pittsburgh PA
    Posts
    57
    Thanks alot for all the help.... 12 degree subcooling and 0 on the superheat both measured at the condenser. everything else seems fine and its cooling well, I should have disconnected the bulb rather than relying on the heat sink though. If anyone thinks of anything else to check id rather not have to change out the valve. thanks again

  4. #17
    Join Date
    Jun 2012
    Location
    Pittsburgh PA
    Posts
    57
    The txv was factory installed and insulated I did use heat sink around the connection, maybe not enough

  5. #18
    Join Date
    Jun 2012
    Location
    Pittsburgh PA
    Posts
    57
    Thanks SIX I thought overheating the bulb would close off the txv??

  6. #19
    Join Date
    Dec 2002
    Location
    Houston,Tx.
    Posts
    15,774
    Quote Originally Posted by Brad gall View Post
    .12 degree subcooling and 0 on the superheat both measured at the condenser..
    This just don't make sense to me, you would think with only a 12° SC if you were able to get that with a wide open valve, that there would be some flashing, and not have a 0 SH, heck you got me. That coil come with a piston and you forgot to remove it?
    __________________________________________________ _______________________
    “Experience is a hard teacher because she gives the test first, the lesson afterwards". - Vernon Law

    "Never let success go to your head, and never let failure go to your heart". - Unknown

  7. #20
    Join Date
    Jun 2012
    Location
    Pittsburgh PA
    Posts
    57
    I just checked my notes on the job the unit is requiring 12 degrees of subcooling and i had 10. Could it be slightly overcharged?

  8. #21
    Join Date
    Dec 2002
    Location
    Houston,Tx.
    Posts
    15,774
    Quote Originally Posted by Brad gall View Post
    I just checked my notes on the job the unit is requiring 12 degrees of subcooling and i had 10. Could it be slightly overcharged?
    Well if it calls for 12° and you have 10° it could be, but I find it hard to believe it's going to make a lot of difference in the SH if you have 0 SH. You can try, but you really don't know where you are with a 0 SH, bring the SC to 12° and see if you get any SH, only way to find out.
    __________________________________________________ _______________________
    “Experience is a hard teacher because she gives the test first, the lesson afterwards". - Vernon Law

    "Never let success go to your head, and never let failure go to your heart". - Unknown

  9. #22
    Join Date
    May 2006
    Location
    Philadelphia, PA
    Posts
    1,373
    Operating pressures and temperatures. The SC indicates undercharge.

    SP
    LP
    ST
    LT
    IWB
    IDB
    ODB

    If you provide data we can help.
    Climate Control Solutions for your Home or Office

    Serving Northeast Philadelphia and Surrounding Areas

  10. #23
    Join Date
    Jun 2012
    Location
    Pittsburgh PA
    Posts
    57
    sp-143 50degree F at condenser (410a refrigerant)New install
    lp-381 115 degree F at condenser
    IWB -? dont have now
    IDB-70
    ODB-85 inlet condenser air/ 98 exiting condenser (93 in sun)
    R/A temp 70
    S/A temp 51

  11. #24
    Join Date
    Dec 2002
    Location
    Houston,Tx.
    Posts
    15,774
    Sure seems like a high suction and head for a 70° ID RA/DB.
    __________________________________________________ _______________________
    “Experience is a hard teacher because she gives the test first, the lesson afterwards". - Vernon Law

    "Never let success go to your head, and never let failure go to your heart". - Unknown

  12. #25
    Join Date
    Jul 2005
    Posts
    5,292
    Quote Originally Posted by Brad gall View Post
    sp-143 50degree F at condenser (410a refrigerant)New install
    lp-381 115 degree F at condenser
    IWB -? dont have now
    IDB-70
    ODB-85 inlet condenser air/ 98 exiting condenser (93 in sun)
    R/A temp 70
    S/A temp 51

    If the 115 is liquid line temperature you have 2° SH on the liquid line.

  13. #26
    Join Date
    Jun 2012
    Location
    Pittsburgh PA
    Posts
    57
    Quote Originally Posted by Mr Bill View Post
    Sure seems like a high suction and head for a 70° ID RA/DB.
    Shouldnt my superheat still be higher even if its overcharged?
    Thanks alot

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