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  1. #1

    Question Trane RTAC Evaporator approach

    We have 2 Trane 155 ton RTAC air cooled chillers and getting proprietary info from Trane is difficult. I need to know what the evaporator approach temperature should be and how to troubleshoot controls if it is too high.

  2. #2
    Join Date
    Jun 2003
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    in a tree looking in your window
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    this should be good
    If you dont stand behind our troops, please feel free...........to stand in front of them.

  3. #3
    Join Date
    Jul 2007
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    The Hot South
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    Your going to need to give more detailed info if you expect help on this site. What approach temps are you running? Asking how to troubleshoot controls is too general of a question.

  4. #4
    Join Date
    Nov 2007
    Location
    Central Alabama
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    Not trying to avoid answering your question but there are too many variables that affect approach to simply say it should ___degrees.

  5. #5
    Evaporator approach is around 2 to 4 degrees and liquid level is 0 to 0.4. The refrigerant pressures are normal for the conditions, 92 and humid. Last week the chiller must have had a compressor loading solenoid or the EXV hanging up at certain times because you could hear the difference in the machine and the pressures and approach would change rapidly and shut down that section of chiller on low evaporator temp. The evaporator is composed of a liquid-vapor distributor and falling film evaporator and the chilled water setpoint is 42 degrees. I have an email sent to Trane to see if I can obtain a service and troubleshooting manual. It would be nice to be able to know diagnostics to be able to do on certain components of the machine such as the EXV and solenoids when this happens again.

  6. #6
    Join Date
    Jul 2007
    Location
    The Hot South
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    May I suggest you read this post. We still need more info to help you.

    http://hvac-talk.com/vbb/showthread.php?t=158850

    What is your EXV position at full load and pressures and temperatures for the problem circuit? You will need a laptop running TechView (free at Trane.com) to get EXV position. Your approaches look good.

  7. #7
    Join Date
    Mar 2004
    Location
    ottawa canada
    Posts
    2,075
    Quote Originally Posted by tikiman1 View Post
    We have 2 Trane 155 ton RTAC air cooled chillers and getting proprietary info from Trane is difficult. I need to know what the evaporator approach temperature should be and how to troubleshoot controls if it is too high.
    You have a lot to learn tikiman ......a lot to learn .
    Approach has so many variables just like the variety of questions on this site .
    The 64 roars to life Whoo hoo ...shes a rolling chassis .
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    I"m not a service tech.. I"m a thermodynamic transfer analyst & strategic system sustainability specialist
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