RTAA 1254 trane chiller
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  1. #1
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    RTAA 1254 trane chiller

    unit is going off on "oil flow control" both compressors. unit does not have oil flow control or oil pressure switch. it is monitored by temp. thermistors. This diagnostic code is not in the book. Does anyone know what this is?

  2. #2
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    You will never guess..... you have low oil flow ?????
    The 64 roars to life Whoo hoo ...shes a rolling chassis .
    You bend em" I"ll mend em" !!!!!!!
    I"m not a service tech.. I"m a thermodynamic transfer analyst & strategic system sustainability specialist
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  3. #3
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    Something doesnt add up here Dave, you say you have a RTAA125 and you are correct they have temp sensors that verify proper oil flow, on RTAAs from 130 tons and up they have a oil differential pressure switch that the micro "tests" every time it stops a compressor, if the oil switch doesnt pass the test it alarms out with "oil flow control".

    Your RTAA 125 should alarm with oil system fault, are you sure of what machine you have here. If it is a RTAA125 or smaller it will have a clear language display where you actually read the alarm messages, if it is a RTAA130 and up it will have a blue LED screen that will give you a diagnostic code that you have to cross over on a chart.

    Which book do you have? RTAA125 and smaller is RTAA-IOM4A and the RTAA130 and up is RTAA-IOM-3 at least thats what they used to be.
    If you dont stand behind our troops, please feel free...........to stand in front of them.

  4. #4
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    Quote Originally Posted by Dave_87 View Post
    This diagnostic code is not in the book.
    Yes it is. Take another look at page 96. Assuming you're looking at the right book to begin with.
    Low Pressure Forever!

    If you know heavy metal, you can work anywhere-Dave Andreson

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  5. #5
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    Oil temp is falling more the 4 degrees below sat cond. temp. Check all sensor for correct readings and check to ground. If there is any reading to ground you should change the sensor. You are more they likely slugging ref. back and cooling the oil. It is usually a bad sensor.

  6. #6
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    Yes. I have a RTAA 1254 and looking at book RTAA-IOM-4A and the clear language display reads "oil flow control cprsr A". Its not reading "Low oil flow" or "oil system fault". The unit will run about 5 to 10 minutes somtimes or it will run 2 hours then shut down on this code.

  7. #7
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    if it was a sensor problem would it have to run for 30 minutes before shutting down on " oil system fault"

  8. #8
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    the clear language display shows " oil flow control" not " oil system fault" like on page 96

  9. #9
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    Dirty coils
    The 64 roars to life Whoo hoo ...shes a rolling chassis .
    You bend em" I"ll mend em" !!!!!!!
    I"m not a service tech.. I"m a thermodynamic transfer analyst & strategic system sustainability specialist
    Best Austin Healey In Show twice in 2013 .....All those hrs paid off .

  10. #10
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    Quote Originally Posted by Dave_87 View Post
    the clear language display shows " oil flow control" not " oil system fault" like on page 96
    Check you configuration. Sounds like you have the wrong compressors configured.

    I had one like that a while ago. Everyone kept thinking it was an "Oil Flow" problem where the wording is actually "Oil System Fault" .

    Found the controls were configured for the wrong compressors.
    "Wheel" mechanics work on "Wheel" chillers

  11. #11
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    I cleaned the coils thursday

  12. #12
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    Quote Originally Posted by Dave_87 View Post
    Yes. I have a RTAA 1254 and looking at book RTAA-IOM-4A and the clear language display reads "oil flow control cprsr A". Its not reading "Low oil flow" or "oil system fault". The unit will run about 5 to 10 minutes somtimes or it will run 2 hours then shut down on this code.
    Sorry, Grabbed the wrong quote. I meant "Oil Flow Control" fault, like you said.
    "Wheel" mechanics work on "Wheel" chillers

  13. #13
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    Do all the fans run and are they going the right direction ?? you say you cleaned the coils , the oil cooler is in the top passes of the coil are they REALLY clean ???
    The 64 roars to life Whoo hoo ...shes a rolling chassis .
    You bend em" I"ll mend em" !!!!!!!
    I"m not a service tech.. I"m a thermodynamic transfer analyst & strategic system sustainability specialist
    Best Austin Healey In Show twice in 2013 .....All those hrs paid off .

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