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  1. #1
    Join Date
    Sep 2002
    Location
    Virginia
    Posts
    3,181

    New Trane 5 ton , 410 high head low suction

    Kinda new .... 3 years old , and has never cooled right

    Im not working on it , boss is

    Hes old school and for some stupid reason never takes sub cool or superheat

    But its kickin his ass , imagine that

    Head 425 , low 100 ambient 95

    He has changed Txv , and weighed in , still low suction high head , same numbers infact

    Liquid is 3/8 , suction 1 1/8 , 40 feet

    OD unit 4A7A5060E100AB 10092W222F 10105YG12F

    Indoor coil cased in front of furnace , same age , 4TXCC006CC3HCAA 8511J375G

    Replaced txv CA 60K ZAA

  2. #2
    Join Date
    Jul 2009
    Location
    Columbia, MD
    Posts
    3,990
    Probably low airflow. Trying to add charge to bring up suction. Or a restriction in both lines.

  3. #3
    Join Date
    Sep 2002
    Location
    Virginia
    Posts
    3,181
    he said he added 2 pounds and it brought up suction a little

  4. #4
    Join Date
    Jan 2006
    Location
    McQueeney, Texas
    Posts
    3,869
    No use in finding the problem, just keep adding freon until the suction is where you think it should be.


    But seriously, guessing is all that's going to happen without proper testing.

    So I'll guess low air flow.......I would weigh the charge.

  5. #5
    Join Date
    Sep 2002
    Location
    Virginia
    Posts
    3,181
    yea he did weigh in after txv change

    He keeps telling me "suction is beer can cold , sweating like mad , why isnt it cooling good "

  6. #6
    Join Date
    Jul 2013
    Posts
    48
    Probably overcharged due to airflow problem

  7. #7
    Join Date
    Nov 2011
    Location
    USA
    Posts
    385
    Quote Originally Posted by Snapperhead View Post

    He keeps telling me "suction is beer can cold"
    That's confirms low airflow. Now it's overcharged.

    The suction pressure would have gone up with the higher head pressure (and the superheat down) if the system was fixed metering, but TXV's maintain a superheat setting, so all the excess charge sits in the condenser, taking up available volume, resulting in more compression and higher pressure.

  8. #8
    Join Date
    Nov 2011
    Location
    USA
    Posts
    385
    Double post

  9. #9
    Join Date
    Dec 2002
    Location
    Arizona
    Posts
    4,412
    Quote Originally Posted by Snapperhead View Post
    Head 425 , low 100 ambient 95

    He has changed Txv , and weighed in , still low suction high head , same numbers infact

    Liquid is 3/8 , suction 1 1/8 , 40 feet

    OD unit 4A7A5060E100AB 10092W222F 10105YG12F

    Indoor coil cased in front of furnace , same age , 4TXCC006CC3HCAA 8511J375G
    At 40' he is overcharged by about a pound. He needs to read his service facts. And somewhere around 135 LS +/- 3, 380 HS +/- 10 depending on IDWB. With 8* SC.
    Make your expertise uniquely valuable.

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  10. #10
    Join Date
    Sep 2002
    Location
    Virginia
    Posts
    3,181
    I will pass that along .... thankya

  11. #11
    Join Date
    Jun 2001
    Location
    Moore, Oklahoma, United States
    Posts
    4,301
    Quote Originally Posted by airmovers View Post
    Probably overcharged due to airflow problem
    +1 Especially considering it's a 5 ton unit. It seems the larger units are almost always short on airflow. Old unit may have been a 3 or 4 ton and homeowner wanted a bigger unit but didn't want to pay for extra ductwork.

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