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  1. #1
    Join Date
    Oct 2018
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    12
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    Water Chiller Problem

    Unit not cooling

    Carrier R22
    m#38ak-008---501
    s#0897g00166
    Aqua products co., inc
    m#dcp-71b
    s#078049700701

    suction pressure-96
    discharge pressure-160
    liquid line pressure-145
    suction line temp-81F
    discharge line temp-186F
    liquid line temp-80F
    Comp RLA-28.8
    Comp actual amps-13.8

    unable as of posting to get TD off water, pressure, or flow.

  2. #2
    Join Date
    Aug 2006
    Location
    Mixing oil and fire with a big spoon.
    Posts
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    The chilled water temperature seems to be at set point so I am not sure why you think there is a problem.
    "Right" is not the same as "Wise".

    Don't step on my favorite part of the Constitution just to point out your favorite part.

  3. #3
    Join Date
    Oct 2018
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    12
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    Thread Starter
    How can you say the chilled water is at set point. I know it is not cooling because the machine it is cooling is over heating. Unfortunately there is no history of performance from the custom besides the chilled water lines were sweating and cold and now they are not. They dont have any real data only that it has been working for the last 20 years and now it is not. There has been no increase in heat load on the unit.

  4. #4
    Join Date
    Sep 2002
    Posts
    26,995
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    Let's kinda look at your numbers here:



    Quote Originally Posted by Snow23 View Post
    Unit not cooling

    Carrier R22
    m#38ak-008---501
    s#0897g00166
    Aqua products co., inc
    m#dcp-71b
    s#078049700701

    ----------------------------------------
    suction line temp - 81F
    SSH - 24º
    suction pressure-96 - 57º
    discharge pressure-160 - 87º
    liquid line pressure-145 - 81º
    liquid line temp - 80F
    Liquid SC - 1.0º

    discharge line temp - 186F

    Imagine my best Karl Childers voice: It ain't got no gais innit!
    -----------------------------------------



    Comp RLA-28.8
    Comp actual amps-13.8

    unable as of posting to get TD off water, pressure, or flow.
    PHM
    --------
    The conventional view serves to protect us from the painful job of thinking.

  5. #5
    Join Date
    Oct 2018
    Posts
    12
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    Thread Starter
    Name plate has a system charge of 1.5lbs. Believe low charge to be the problem i added 1 lb with no change.

  6. #6
    Join Date
    Aug 2006
    Location
    Mixing oil and fire with a big spoon.
    Posts
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    Quote Originally Posted by Snow23 View Post
    How can you say the chilled water is at set point...
    Exactly.
    "Right" is not the same as "Wise".

    Don't step on my favorite part of the Constitution just to point out your favorite part.

  7. #7
    Join Date
    Oct 2018
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    12
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    Thread Starter
    Quote Originally Posted by Snow23 View Post
    Name plate has a system charge of 1.5lbs. Believe low charge to be the problem i added 1 lb with no change.
    Manaual says unit comes factory charged with 7 lbs. Recovered freon and made sure it had 7 lbs.
    From what I understand the subcool is very low so no liquid to the txv so no cooling. With the high suction pressure and low discharge pressure Im thinking bad compressor valves, but I was under the impression that scroll compressors couldnt fail this way.

  8. #8
    Join Date
    Sep 2002
    Posts
    26,995
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    Every pump can wear out. With scrolls it's obviously not the rings or the valves but the scrolls themselves can eventually wear out.

    But . . . . is there any thing which bypasses the TXV? Hot gas bypass or anything like that?

    What other components are there beside them Condenser, Receiver, TXV, Evaporator, ad the Compressor?

    Does the compressor ever cycle off on it's internal overload?

    PHM
    ------------




    Quote Originally Posted by Snow23 View Post
    Manaual says unit comes factory charged with 7 lbs. Recovered freon and made sure it had 7 lbs.
    From what I understand the subcool is very low so no liquid to the txv so no cooling. With the high suction pressure and low discharge pressure Im thinking bad compressor valves, but I was under the impression that scroll compressors couldnt fail this way.
    PHM
    --------
    The conventional view serves to protect us from the painful job of thinking.

  9. #9
    Join Date
    Jul 2018
    Location
    Kazakhstan
    Posts
    23
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    Is it condensing unit with Copeland ZR94KC scroll? Does this system has Hot Gas Bypass?
    Without hot gas you may close liquid line valve and check the suction pressure. If it will go down to about 0 bar (dont let vacuum), compressor is in order. Previously adjust low pressure switch.

  10. #10
    Join Date
    Oct 2018
    Posts
    12
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    Thread Starter
    Compressor m#zb58kce-tf5-931
    no hot gas bypass
    no reciever
    nothing bypasses txv
    compressor does not cycle off on overload

  11. #11
    Join Date
    Aug 2002
    Location
    Southold, NY
    Posts
    25,768
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    Quote Originally Posted by Snow23 View Post
    Name plate has a system charge of 1.5lbs. Believe low charge to be the problem i added 1 lb with no change.
    Total charge 1.5#'s and you added 1# ???

  12. #12
    Join Date
    Aug 2002
    Location
    Southold, NY
    Posts
    25,768
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    Quote Originally Posted by Snow23 View Post
    Manaual says unit comes factory charged with 7 lbs. Recovered freon and made sure it had 7 lbs.
    From what I understand the subcool is very low so no liquid to the txv so no cooling. With the high suction pressure and low discharge pressure Im thinking bad compressor valves, but I was under the impression that scroll compressors couldnt fail this way.
    Factory charge is 7#'s you adjust it in the field according to the chart in the manual!

  13. #13
    Join Date
    Feb 2010
    Location
    montreal
    Posts
    298
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    Google is telling me that 38ak is a split condensor. Not a chiller
    Is Google right? Just trying to figure out on what your working.
    How long of pipe do you have to the condensor.
    What is water in- water out temp
    What is the temp at the condensor?

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