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  1. #1
    Join Date
    Aug 2008
    Location
    Philadelphia
    Posts
    84

    Mc Quay service procedure

    I'm in the hunt for a publication by McQuay: SP-0521-C, Oil-Loss guide.

    I can't get to it via their website.

    I have a good size machine that is losing oil and has a major leak, and I hope I'm going to have to take it apart!

  2. #2

    sp521c

    Hope this helps,oil loss is hard to troubleshoot somtimes.If it is a older chiller
    without the orfice,check the center ventline sevice valve,it should be adjusted for proper vent,(barely opened,1-4 turns opened).Also check the front end to see if it will stay (no change in amps)when put into manual load/unload.
    Attached Files Attached Files

  3. #3
    Join Date
    Aug 2008
    Location
    Philadelphia
    Posts
    84
    words cannot accurately convey my thanks! I will let you know how it turns out!

  4. #4
    Join Date
    Jun 2009
    Location
    Tri State
    Posts
    4
    anybody have a service bulletin for als150... for getting the oil to return to oilseparator i have a discharge superheat of 0 .....replaced EXV and liquid injection solenoid factory claims i have too much oil in system and that is making the exv malfunction.......oh and i weighed the charge...willing to trade info
    Last edited by boon; 07-02-2011 at 09:56 PM. Reason: just because

  5. #5
    Join Date
    Mar 2009
    Location
    Mid-Mo
    Posts
    3,595
    Quote Originally Posted by boon View Post
    anybody have a service bulletin for als150... for getting the oil to return to oilseparator i have a discharge superheat of 0 .....replaced EXV and liquid injection solenoid factory claims i have too much oil in system and that is making the exv malfunction.......oh and i weighed the charge...willing to trade info
    Gonna have to give more info than that for us to be able to help you. Superheat? Subcooling? Exv position? Charge? Checked transducers and all sensors?

  6. #6
    Join Date
    Jun 2009
    Location
    Tri State
    Posts
    4
    Discharge Superheat @ 0deg
    EXV Position at 350
    Suction suerheat at 7deg
    checked transducers and thermistors
    Factory Claims too much oil in charge
    is there a service bulletin on returning oil to separator all i need is a service bulletin number

  7. #7
    Join Date
    Oct 2003
    Location
    tidewater, va
    Posts
    2,138
    thanks for the info

  8. #8
    Join Date
    Jun 2010
    Location
    northwest connecticut
    Posts
    58
    discharge superheat of 0 and suction of 7 is that possible you will get poor seperation with a low discharge superheat, but if the suction is at seven????

  9. #9
    Join Date
    Jun 2009
    Location
    Tri State
    Posts
    4
    sorry suction superheat is 7 deg

  10. #10
    Join Date
    Mar 2009
    Location
    Mid-Mo
    Posts
    3,595
    Something isn't making sense. What percentage was the compressor running at when readings were taken? Oil level in the separator?

  11. #11
    Join Date
    Jun 2009
    Location
    Tri State
    Posts
    4
    50% load, tested with amp probe oil level disappears in about 10 min compressor IS pumping liquid i can hear it sounds like marbles that would explain the low discharge superheat reading.....Factory says too much oil in charge will affect operation of TXV........What can I do to get the oil back to oil separator

  12. #12
    Join Date
    Mar 2009
    Location
    Mid-Mo
    Posts
    3,595
    Load the compressor and it should come back. Remember suction velocity helps carry the oil back. I've heard that marbles sound and I think you may have an internal gate rotor failure. Iso the compressor, take the gas out, then check the rotors. We have lost quite a few of those compressors.

  13. #13
    Join Date
    Jun 2010
    Location
    northwest connecticut
    Posts
    58
    That noise could also be liqud refrrigerant, your suction superheat should be rechecked with a thermocouple, with a dicharge superheat of 0 your suction superheat is probably lower than 7, iused to here that noise alot on flooded screws with charge issues, the refrigerant would then wash out the oil !!!

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