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  1. #1
    Join Date
    Apr 2008
    Location
    Georgia
    Posts
    8

    Smile Trane RTAAA904Y issues

    Kennesaw State here again,

    We have one of these beasts here...issues after issues with A and B compressors. We have been expereincing this unit with CKT A shutting down on low ambient temp, CKT B is now going off on high and low oil temp.

    CKT B condenser fan is staging out of sequence with a head pressure of 370psi for 5mins. Oil is 170 degrees, and tripping circut intermitantly.

    Anyone else having issues with this species of Trane air cooled? Thanks for any help, and your time by looking.



    Mike

  2. #2
    Join Date
    Dec 2005
    Posts
    1,823
    Quote Originally Posted by SilverWolf View Post
    Kennesaw State here again,

    We have one of these beasts here...issues after issues with A and B compressors. We have been expereincing this unit with CKT A shutting down on low ambient temp, CKT B is now going off on high and low oil temp.

    CKT B condenser fan is staging out of sequence with a head pressure of 370psi for 5mins. Oil is 170 degrees, and tripping circut intermitantly.

    Anyone else having issues with this species of Trane air cooled? Thanks for any help, and your time by looking.



    Mike
    Call service.

    No DIY


  3. #3
    Join Date
    Aug 2006
    Location
    Mixing oil and fire with a big spoon.
    Posts
    4,010
    failing sensors, dirty condenser coil, could be lots of things.

    if the fans are staging out of order, then the wiring has been messed with.

    lots of work in your future.
    It's tube brushing season...93% done (39.35 miles of tubing)...only 1,242 tubes to go!

    Original member of the Raccoon Brotherhood.

    EVERYTHING IS AWESOME!!!

  4. #4
    Join Date
    Feb 2006
    Location
    Atlanta,GA.
    Posts
    811
    could be somebody altered some settings in menu 5

  5. #5
    Join Date
    Oct 2008
    Location
    KSA
    Posts
    2
    ONE SMALL CHIP IS AVAILABLE IN TRANE FOR(RTAA)MODEL WHICH CAN FIX IN CHILLER MODEL TO MAKE MAKE PROPER TIMING FOR FAN STAGES AS PER COMP LOAD V/S PRESS.
    IT IS SIMPLE MODIFICATION .LITRETURE AVAILABLE IN TRANE.

  6. #6
    Join Date
    Jan 2005
    Location
    Houston TX
    Posts
    866

    Yeah, but you know what

    A couple of responses are confusing- A RTAA090 has a clear lang. display and no menu 5 as the RTAA140's and up do. You would have to go into the start-up settings if you wanted to change low ambient, by the way that won't make a difference as that is for machine shut down (total) in cold ambient, not just circuit A or B. The fan chip is also for the larger RTAA's. Not the RTAA070-RTAA125's. Depending just how long this machine has been in service would determine next course of action.-GEO
    Once in a while everything falls into place and I am able to move forward, most of the time it just falls all over the place and I can't go anywhere-GEO

  7. #7
    Join Date
    Jun 2006
    Location
    midwest
    Posts
    120

    Confused rtaa

    sounds like your temp sensors need some attention. as for the low ambient c/o, whats it set at?that can be set at the control panel if u know how to read a manual.

  8. #8
    Join Date
    Aug 2006
    Posts
    2,555
    Are your Coils clean? and I mean really clean, not just half "A" hosed out. With oil temperature problems, that would be the first thing I'd look at.

    BTW For air cooled these are the best Chillers out there IMO. You've got to do the Maintenance on them, that's coil cleaning, contactor inspection, Aux. contact replacement, turn downs, including the compressor terminals, inside the terminal box should be cleaned. Also check your condensor fans, on some models they Daisy chained two motors off one contactor, you could be drawing amps and one fan is DOA.

  9. #9
    If Im not mistaken the ambiant sensor plays a role in fan staging and may be the cause of all your problems

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