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Thread: High suction?

  1. #1
    Join Date
    Jun 2012
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    Great lakes
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    High suction?

    Installed a new r22 w/txv used old line set. Only got a 520 micron pull on system. Went to start up the unit. I only got a 10 degree difference in temp.

    The low side was at 100 psi witch is around 60 degrees.
    It's supposed to be around 40 right. So I removed some freon.it didn't help

    Now low side on gauge is 85 psi
    High side on gauge is 150 psi

    At condenser Liquid line temp is 84 degrees
    Suction line temp is 80 degrees

    At e-vap. Liquide line temp is 81 degrees
    Suction line temp is 81 degrees

    The house is at 84 degrees and temp outside is 86 degrees

    That should put the super heat at 32 degrees
    And the sub-cooling at -2 degrees Any thoughts out their

  2. #2
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  3. #3
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    Dec 2002
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    You sure the outdoor and indoor units are the same tonnage?
    __________________________________________________ _______________________
    “Experience is a hard teacher because she gives the test first, the lesson afterwards". - Vernon Law

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  4. #4
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    New coil or some old relic?

  5. #5
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    Quote Originally Posted by Dustykyle View Post
    Installed a new r22 w/txv used old line set. .
    Installed a new R-22 what? Condenser? Coil? Both?
    __________________________________________________ _______________________
    “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

  6. #6
    Join Date
    Jul 2005
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    5,576
    Quote Originally Posted by Dustykyle View Post
    Installed a new r22 w/txv used old line set. Only got a 520 micron pull on system. Went to start up the unit. I only got a 10 degree difference in temp.

    The low side was at 100 psi witch is around 60 degrees.
    It's supposed to be around 40 right. So I removed some freon.it didn't help

    Now low side on gauge is 85 psi
    High side on gauge is 150 psi

    At condenser Liquid line temp is 84 degrees
    Suction line temp is 80 degrees

    At e-vap. Liquide line temp is 81 degrees
    Suction line temp is 81 degrees

    The house is at 84 degrees and temp outside is 86 degrees

    That should put the super heat at 32 degrees
    And the sub-cooling at -2 degrees Any thoughts out their
    Get SC up to 10° and see what happens. Some TXV's will let enough hot gas through to artificially load the evaporator coil. Suction pressure will run higher than normal until you get a full charge in it. Under those conditions your SST should be running in the high 40's to low 50's, depending upon model.

  7. #7
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    Quote Originally Posted by Mr Bill View Post
    Installed a new R-22 what? Condenser? Coil? Both?
    Yeah new condenser and coil.

  8. #8
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    Quote Originally Posted by Mr Bill View Post
    You sure the outdoor and indoor units are the same tonnage?
    Condenser is a carrier and the coil is a match it said a 1.5 to 3 ton coil

  9. #9
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    Quote Originally Posted by jpsmith1cm View Post
    Given the info you've provided, I'd look at the compressor valves.
    Are you refering to the valves off the condenser they are fully open.

  10. #10
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    Quote Originally Posted by Dustykyle

    Are you refering to the valves off the condenser they are fully open.
    Nope.

    It sounds as if your compressor is inefficient.

  11. #11
    Join Date
    Jul 2010
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    nebraska
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    Quote Originally Posted by Dustykyle View Post

    At condenser Liquid line temp is 84 degrees
    Suction line temp is 80 degrees

    At e-vap. Liquide line temp is 81 degrees
    Suction line temp is 81 degrees

    The house is at 84 degrees and temp outside is 86 degrees
    And the sub-cooling at -2 degrees
    Liquid line is 5 degrees cooler than ambient meaning it's flashing into gas. Without a solid flow of liquid the txv can't work right. Suction near 100 might be close to right with a 84 return if there's much humidity. Get the subcool up to 8-9 and see what it does after some run time

  12. #12
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    Jul 2006
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    what size are the suction and liquid line?

  13. #13
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    Jun 2012
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    Great lakes
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    So you are suggesting to put more freon in the system, and that should raise my sub-cooling. Yes humitity is present.

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