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Thread: RTAA screaming

  1. #14
    Join Date
    Apr 2011
    Location
    Florida
    Posts
    2
    I should have said that I intend to check the piston while the system is down. The service bulletins available describe it better. I am concerned about the possibility that the piston might be sticking. This is not the first time the system has done this. I could not confirm at what time of day or what the sequence was which started this. Its been almost 3 yrs since the last occasion. I am wondering if this could have been " morning syndrome". No codes where available when I arrived. Owner knew how to reset and clear history. It was a holiday and I'm not sure which compressor was lead at that time or how long it had been off.
    The oil I have removed is not good. Testing indicates moisture but not at really high levels. Color was darker than I'm used to. Since I'm not sure how much was lost and have moisture and an odd color. My decision to change the oil is mostly because I am already pretty much there. Yes, I know flushing a barrel is costly and not 100% successful. At this point, I have not verified that a large quantity of oil is in the barrel. Could have been low to start with. I am only called when they cannot make things run! Nice to be needed. LOL

  2. #15
    Join Date
    Mar 2011
    Location
    North Carolina Piedmont Area
    Posts
    407
    Quote Originally Posted by JULIANOD View Post
    I should have said that I intend to check the piston while the system is down. The service bulletins available describe it better. I am concerned about the possibility that the piston might be sticking. This is not the first time the system has done this. I could not confirm at what time of day or what the sequence was which started this. Its been almost 3 yrs since the last occasion. I am wondering if this could have been " morning syndrome". No codes where available when I arrived. Owner knew how to reset and clear history. It was a holiday and I'm not sure which compressor was lead at that time or how long it had been off.
    The oil I have removed is not good. Testing indicates moisture but not at really high levels. Color was darker than I'm used to. Since I'm not sure how much was lost and have moisture and an odd color. My decision to change the oil is mostly because I am already pretty much there. Yes, I know flushing a barrel is costly and not 100% successful. At this point, I have not verified that a large quantity of oil is in the barrel. Could have been low to start with. I am only called when they cannot make things run! Nice to be needed. LOL
    Well have you got it running yet?

    Troubleshooting is not part of the repair.............understand the symptoms and you will find a solution.

  3. #16
    Join Date
    Dec 2009
    Posts
    133
    Well first time back on the job site since last year. I wasn't working in this particular chiller but I walked over to check on it and this is what I find...




    Can anyone explain this? In case you can't see it in the pictures the steal braided line comes off the plate in front of the load/unload and goes to a port on the bottom of the comp.

  4. #17
    Join Date
    Nov 2004
    Location
    up in the hizzy
    Posts
    1,295
    Quote Originally Posted by 929rc51 View Post
    Well first time back on the job site since last year. I wasn't working in this particular chiller but I walked over to check on it and this is what I find...




    Can anyone explain this? In case you can't see it in the pictures the steal braided line comes off the plate in front of the load/unload and goes to a port on the bottom of the comp.
    looks like the lip seal leaked and it got mended.

  5. #18
    Join Date
    Mar 2011
    Location
    North Carolina Piedmont Area
    Posts
    407
    Lip Seal Failure.
    What is the serial number for the compressor?
    But I am still learning and looking for a new mentor.
    _______________________
    In a strict sense troubleshooting is not part of the repair..........understand the symptoms and you will find a solution.

  6. #19
    Join Date
    Mar 2004
    Location
    ottawa canada
    Posts
    1,860
    That is a lip seal re-route kit , it wont hurt the compressor even if the lip seal was NOT leaking . Its a common fix on the larger RTAA compressor .When the lip seal leaks the compressor usually loads on its own without signals from the UCM the re-route kit diverts the leaking pressure back to the suction side of the compressor . As long as the re-route kit can handle the small amout of leak it will be fine if the leak exceeds the re-route kit capabilitys then you have to replace the compressor.
    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 .

  7. #20
    Join Date
    Dec 2009
    Posts
    133
    I don't have the serial of the comp. I'll get it tomorrow if I remember.

    Thanks for your help guys. I now have another issue on another rtaa but I'll start a new thread about it if I have to. Trying to use that search function first

  8. #21
    Join Date
    Dec 2009
    Posts
    133
    UA3D5282

  9. #22
    Join Date
    Dec 2009
    Posts
    133
    So now that I have read SB-18 I understand what that block and bleed/bypass line is there for. And if the load solenoid passes then I will be adding another one to the chiller next to it...

  10. #23
    Join Date
    Jul 2007
    Location
    The Hot South
    Posts
    1,208
    Quote Originally Posted by Healey Nut View Post
    the re-route kit diverts the leaking pressure back to the suction side of the compressor . As long as the re-route kit can handle the small amout of leak it will be fine if the leak exceeds the re-route kit capabilitys then you have to replace the compressor.
    Hey Healey, are you sure the re-route kit bleeds the excess pressure from the leaking lip seal back to suction? I thought it created a complete new path from the slide valve piston to suction externally. Meaning if you have a complete failure of the lip seal and the bearing cavity stayed at discharge pressure, it wouldn't matter because the slide valve piston has an isolated path to suction.

  11. #24
    Join Date
    Mar 2004
    Location
    ottawa canada
    Posts
    1,860
    Quote Originally Posted by R123 View Post
    Hey Healey, are you sure the re-route kit bleeds the excess pressure from the leaking lip seal back to suction? I thought it created a complete new path from the slide valve piston to suction externally. Meaning if you have a complete failure of the lip seal and the bearing cavity stayed at discharge pressure, it wouldn't matter because the slide valve piston has an isolated path to suction.
    SB18 explains it . I was just generalizing in my explanation . The reroute kit creates a new less retrictive path for the unload solenoid to relieve pressure back to suction .
    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 .

  12. #25
    Join Date
    Jan 2005
    Location
    Houston TX
    Posts
    868
    First oil pressure differential switch is set at 50#'s pressure drop through the oil filter and main oil solenoid. It has nothing to do with discharge - suction. If it is still the little micro switch in a can there were problems with it from day 1. If the dip switch setting for the compressor motor amps and what is posted in the hidden menu don't agree, then the controller automatically reverts back to the 0000 setting, which is the lowest amperage allowed. -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

  13. #26
    Join Date
    Aug 2006
    Location
    Mixing oil and fire with a big spoon.
    Posts
    4,017
    Quote Originally Posted by ga1279 View Post
    First oil pressure differential switch is set at 50#'s pressure drop through the oil filter and main oil solenoid. It has nothing to do with discharge - suction....
    are you saying that the 'oil pressure differential switch setpoint of 50 psid' has nothing to do with discharge and suction pressures

    or

    are you saying that 'oil pressure differential' has nothing to do with discharge and suction pressures?
    It's tube brushing season...93% done (39.35 miles of tubing)...only 1,242 tubes to go!

    Original member of the Raccoon Brotherhood.

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