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  1. #1
    Join Date
    Nov 2011
    Location
    South Texas
    Posts
    60

    Trane RTAA 215// circuit a,b intermittent low oil flow codes 199

    I have read and lurked here for a while before posting for help. Background on the unit is 220 ton chiller system 1998 vintage with dual screws. The unit is intermittently shutting down either circuit A or B from time to time with no rhyme or reason and it never acts up while I'm onsite to catch it. Right now it's 83 degrees here and dropping to 60 or so at night. Sometimes it will go for days perfectly without a problem.

    All condenser fans are running correctly operation verified
    25lb of pressure drop across both circuit oil filters
    UCM has updated program and OAT sensor installed
    Oil level is spot on in both oil coolers
    All electrical connections on oil DP switch have been verified
    Compressors are starting at 40% load and then modulating up to around 70%

    Condenser is visibly clean but I'm going to wash it out tomorrow to get a baseline on it.

    I have not physically tested the oil pressure DP switch's yet.

    But when it was 112-114 degrees this summer it ran like a top without a problem it's only once the weather cooled off in the last month these stinkin little gremlins are showing up. thanks for the help and any ideas are appreciated.

  2. #2
    Join Date
    Jan 2009
    Location
    Not in Iran
    Posts
    1,092
    I would start w the DP switch., oil filter., clean condenser coils., and charge.,

    good luck
    no signature blast'em man blast'em
    !!!KILL THE TERRORIST!!!

  3. #3
    Join Date
    Dec 2008
    Location
    Dixiana, AL
    Posts
    2,610
    Quote Originally Posted by aggiechillertech View Post
    Condenser is visibly clean but I'm going to wash it out tomorrow to get a baseline on it.

    I have not physically tested the oil pressure DP switch's yet.
    If you had gone ahead and done these two things, it probably wouldn't have PO'ed graham for you to start this thread. As it is, he's probably choking on his beer right now and trembling too hard to type in his response.

    I'd get these two items out of the way before doing anything else. Post your actual numbers on everything if you have to call back........

    You can also find endless hours of reading on this subject and all of it's nuances simply by doing a site search on it.

  4. #4
    Join Date
    Nov 2011
    Location
    South Texas
    Posts
    60
    10-4 I'll wash it and post up some numbers tomorrow. Thanks for the help.

  5. #5
    Join Date
    Mar 2004
    Location
    ottawa canada
    Posts
    2,054
    AAAaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaahhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh
    f%%%%%%%%%%%########$$$$$$$$$$**********&&&&&&&&&& &???????????????? not anothing friggin RTAA oil code post .!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!
    AAaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
    Wheres my gattling gun Im goin Postal !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
    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 .

  6. #6
    Join Date
    Nov 2011
    Location
    South Texas
    Posts
    60
    How does the UCM logic work regarding this safety. While running it is looking for a minimum 50 lb differential and the contacts are closed. Does it test the integrity of the circuit in any other manner during operation and or shutdown process.

    I don't have a clue what conditions are present when the failure is actually happening to determine if it is during system run or start up or some combination between.

    Sure would be nice if it had freeze frame diagnostics like car control systems do.

  7. #7
    Join Date
    Jul 2007
    Location
    The Hot South
    Posts
    1,316
    Quote Originally Posted by aggiechillertech View Post
    How does the UCM logic work regarding this safety. While running it is looking for a minimum 50 lb differential and the contacts are closed. Does it test the integrity of the circuit in any other manner during operation and or shutdown process.

    I don't have a clue what conditions are present when the failure is actually happening to determine if it is during system run or start up or some combination between.

    Sure would be nice if it had freeze frame diagnostics like car control systems do.
    All the UCM is doing, regarding this fault, is look at the DP switch contacts. If it opens, it calles out the fault. The DP switch should be set at 50 PSID + or - 5 (i set it at 55). Upon shutdown, the UCM closes the master oil solenoid valve and looks for the DP switch to open to test the integrity of the switch.

  8. #8
    Join Date
    Jan 2008
    Location
    Dallas ,Texas
    Posts
    3,718
    Quote Originally Posted by aggiechillertech View Post
    How does the UCM logic work regarding this safety. While running it is looking for a minimum 50 lb differential and the contacts are closed. Does it test the integrity of the circuit in any other manner during operation and or shutdown process.

    I don't have a clue what conditions are present when the failure is actually happening to determine if it is during system run or start up or some combination between.

    Sure would be nice if it had freeze frame diagnostics like car control systems do.
    You might want to use the search feature there are several threads already covering the subject of oil pressure alarms. Maybe Jayguy will show up and see your thread, he doesn`t go postal all the time like Graham he was the nicer Trane guy.
    UA 100

    It takes three people to do anything around here. Two do the work, one explains to the crowd of people who showed up when they seen smoke and flames.

  9. #9
    Join Date
    Jan 2008
    Location
    Dallas ,Texas
    Posts
    3,718
    Quote Originally Posted by R123 View Post
    All the UCM is doing, regarding this fault, is look at the DP switch contacts. If it opens, it calles out the fault. The DP switch should be set at 50 PSID + or - 5 (i set it at 55). Upon shutdown, the UCM closes the master oil solenoid valve and looks for the DP switch to open to test the integrity of the switch.
    I`m wanting to say I heard that there was a bad batch of switches out there. Not sure how old this machine is or if it has ever had the problem addressed.
    UA 100

    It takes three people to do anything around here. Two do the work, one explains to the crowd of people who showed up when they seen smoke and flames.

  10. #10
    Join Date
    Nov 2011
    Location
    South Texas
    Posts
    60
    Everything about it looks stone stock. We'll give it a good bath and scrub behind the ears double check the pressure switch's and see what happens. I had a hunch I just wanted to hear someone else's opinions to back up my hunch. Thanks again.

  11. #11
    Join Date
    Aug 2006
    Location
    Mixing oil and fire with a big spoon.
    Posts
    4,376
    Quote Originally Posted by thegoodlistener View Post
    ...Maybe Jayguy will show up and see your thread, he doesn`t go postal all the time like Graham he was the nicer Trane guy.
    'WAS' is right! now Graham is the nicest Trane guy!

    check your oil pressure switch 'X' number...if it ends in '03' or '-03'...change it out as they tended to drift over time.

    perform a very thorough checkout of the oil solenoid coil. if it is overheating or occasionally dropping out (bad wire nuts?) then this will cause the pressure switch to trip and of course, check out the pressure switch.

    the foaming around Grahams mouth isn't from the beer!
    "Mother" is the name for God on the lips and hearts of children....The Crow

  12. #12
    Join Date
    Mar 2004
    Location
    ottawa canada
    Posts
    2,054
    Quote Originally Posted by jayguy View Post
    'WAS' is right! now Graham is the nicest Trane guy!

    the foaming around Grahams mouth isn't from the beer!
    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 .

  13. #13
    Join Date
    Jan 2009
    Location
    Not in Iran
    Posts
    1,092

    Talking

    good times
    no signature blast'em man blast'em
    !!!KILL THE TERRORIST!!!

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