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Thread: rack flooding

  1. #27
    Join Date
    Nov 2007
    Location
    State College, Pa.
    Posts
    42
    A tripped oil safety switch doesn't necessarily indicate a flood back problem. A single phase condition, caused by either a power failure, or burned contacts on the compressor contactors could also cause your oss to trip. I suspect this was a gradual condition, ocuring over several days. if the system is computer driven, you may be able to access the history logs to help you determine what happened.







    remember, no good deed goes unpunished

  2. #28
    Join Date
    Jan 2006
    Location
    DFW Metroplex
    Posts
    4,910
    Quote Originally Posted by fuzzyj View Post
    A tripped oil safety switch doesn't necessarily indicate a flood back problem. A single phase condition, caused by either a power failure, or burned contacts on the compressor contactors could also cause your oss to trip. I suspect this was a gradual condition, ocuring over several days. if the system is computer driven, you may be able to access the history logs to help you determine what happened.







    remember, no good deed goes unpunished

    Good point.

    I took it as a given the oil trips were in fact due to liquid floodback.

    Can't assume anything really, can we?

  3. #29
    Join Date
    Jun 2005
    Posts
    14
    check the superheat on all txv checked all cases for no floodback due to clogged drain bad defrost heaters etc
    next check to make sure the superheat is set correctly on compressors copeland recommend 13 degrees at compressor

  4. #30
    Join Date
    Jan 2006
    Location
    DFW Metroplex
    Posts
    4,910
    Quote Originally Posted by daygotech View Post
    check the superheat on all txv checked all cases for no floodback due to clogged drain bad defrost heaters etc
    next check to make sure the superheat is set correctly on compressors copeland recommend 13 degrees at compressor
    Has it changed???

    I thought it was always no less than +20F and no more than +40F at the compressor.

  5. #31
    Join Date
    Jul 2005
    Location
    FLORIDA
    Posts
    1,163
    Quote Originally Posted by daygotech View Post
    check the superheat on all txv checked all cases for no floodback due to clogged drain bad defrost heaters etc
    next check to make sure the superheat is set correctly on compressors copeland recommend 13 degrees at compressor
    thats way low for a rack system at the suction service valve brother

    need to pull out the AE book and get the proper superheat at the compressor but the starting point is the evap and then the compressor and if its line then all is good if not piping is a problem
    once you think you've seen it all
    (THINK AGAIN)
    I would rather work for free than be look upon as a thief!!!!!

  6. #32
    Join Date
    Jun 2001
    Location
    Michigan
    Posts
    12,077
    18 days ago guys. Old news.

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