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  1. #1
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    Jun 2010
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    Converting a Trane RTAA from standard leaving temp to low temp

    I have six RTAA chillers I would like to convert to lo-temp. I've been told by a few people that the conversion is only a software change-up and a relative reduction in tonnage. Does anyone have any input on what the most economical way to do this across multiple chillers is?

  2. #2
    Join Date
    Feb 2010
    Location
    MEXICO
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    472
    would have to modify the programming of the machine, use glycol intoaccount takes a loss of capacity of the machine would have to install an oil cooler for compressors

  3. #3
    Join Date
    Jun 2010
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    25
    How do I go about modifying the programming? Is this something that could be done using the controls on the machine or will I have to plug a laptop in and do some sort of ladder logic change? If so, what cable and interface program do you use for something like this?

    Also I was under the impression that the oil cooler for RTAAs is in the top portion of the coils. Will this now require additional oil coolers?

  4. #4
    Join Date
    Feb 2010
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    MEXICO
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    472
    so it is needed is needed adicional.ya oil cooler temperatures than by evaporation and condensation to ice maker or brine is necesario.enviame the type of display that has the machine

  5. #5
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    Feb 2010
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    MEXICO
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    what's your email

  6. #6
    Join Date
    Jun 2010
    Posts
    25
    All of the RTAAs I am interested in converting to low-temp have the standard Trane Adaptive Control display. They are RTAAs ranging in year from 1993 to 2001.

  7. #7
    Join Date
    Jun 2010
    Posts
    25
    My email is rnreuter@gmail.com

  8. #8
    Join Date
    Jan 2004
    Location
    Atoka, TN
    Posts
    42
    Quote Originally Posted by rnr07 View Post
    I have six RTAA chillers I would like to convert to lo-temp. I've been told by a few people that the conversion is only a software change-up and a relative reduction in tonnage. Does anyone have any input on what the most economical way to do this across multiple chillers is?
    Page 4 I believe

  9. #9
    Join Date
    Jun 2010
    Posts
    25
    Quote Originally Posted by cri3541 View Post
    Page 4 I believe
    What do you mean page 4?

  10. #10
    Join Date
    Jun 2010
    Posts
    25
    Oh I see that you were pointing me in the direction of this thread on page 4 of the chillers forum:

    http://hvac-talk.com/vbb/showthread.php?t=547222

    That thread was geared towards RTAC chillers. Given that these are RTAAs, is it true that I have to get Trane to do the software change? Is this because it takes a special interface to make changes to the module? Since I want to do this to so many chillers, I would be fine with buying the software/hardware to do this, I just need some input on what all it would take to make the change.

    Thanks for all the help so far.

  11. #11
    Join Date
    Jun 2009
    Location
    Florida
    Posts
    540
    Quote Originally Posted by rnr07 View Post
    Oh I see that you were pointing me in the direction of this thread on page 4 of the chillers forum:

    http://hvac-talk.com/vbb/showthread.php?t=547222

    That thread was geared towards RTAC chillers. Given that these are RTAAs, is it true that I have to get Trane to do the software change? Is this because it takes a special interface to make changes to the module? Since I want to do this to so many chillers, I would be fine with buying the software/hardware to do this, I just need some input on what all it would take to make the change.

    Thanks for all the help so far.
    Just how low are you planning on running them? Are you going to use them for ice building or just running a lower chilled water supply temp? You can go down to 40 deg chwtr supply with no changes other than lowering the setpoint. Any lower than that, you'll have to run a glycol mix (this is where the biggest factor in derating of unit tonnage comes in due to the lower heat transfer coefficient of glycol--the higher the percentage, the lower the tonnage) and lower the lvg chwtr temp cut out and low ref evap temp cut out. If you want to build an ice bank, you need the options module (1U2) and have a relay to close the ice build contacts on the module and controlled by your BAS. Termination of ice build is controlled by setting the return fluid temp (usually around 26 deg) cutout which is activated when the options mod puts the unit in ice build mode. The RTAA still uses the existing oil cooler when used for low temp and no auxilliary cooler is needed. It ain't rocket science and RTAA's are almost ready to run low temp out of the box, but there are a few changes that need to be made depending on type of service (ice build or just lower than normal chwtr supply)
    Low Pressure Forever!

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

    Anchors Aweigh my boys, Anchors Aweigh!
    Farewell to foreign shores, We sail at break of day. Through our last night on shore, Drink to the foam. Until we meet once more. Here's wishing you a happy voyage home!

  12. #12
    Join Date
    Dec 2004
    Location
    Brooklyn, New York
    Posts
    170
    I love RTAA's.

  13. #13
    Join Date
    Mar 2004
    Location
    ottawa canada
    Posts
    2,044
    If you are going to run it below 38LWT you need to change the oil . Read the IOM .
    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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