Trane screw chiller
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  1. #1

    Trane screw chiller

    Alarm indicates a low refrigerant liquid level in circuit #2, however my subcooling is 20F. The rest of my readings show:
    EXV 100% OPEN
    Liquid level (-1.7)
    Evaporator pressure 27.8
    Evaporator approach 11.8
    Condenser pressure 125
    Condenser approach 16
    Discharge superheat 42.5
    Sight Glass (NO bubbles)
    Liquid line filter drier (No temperature differental)
    Leaving chill water: 44F
    Entering chill water: 60F

    Any idea what it could be? I suspect it is a refrigerant restriction somewhere mabye in the EXV, but I was able to see the stem of the EXV move in and out. Could the EXV still have a restriction but be mechanicaly ok?

  2. #2
    Join Date
    Jul 2007
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    The Hot South
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    1,288
    It would help if you posted the model and serial number....

    Is this the RTWD100 chiller Serial # U08L02012 in Hawaii?

    Also, where are you taking your temperature and pressure readings to determine subcooling?

  3. #3
    Join Date
    Jan 2009
    Location
    Not in Iran
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    1,046
    Ur exv should not be 100% open -/ remember that ur chiller wants to stay running no matter what ,. Low liquid level- ur -1.7 is not correct at all,. Should maintain 0.0
    In condenser and evap,.I would be looking for oil residue /- also u might want to think about weighting the charge. And ur approach is way out of wack- u have a few things going on here,. Could very well be dirty tubes

  4. #4
    Join Date
    Aug 2006
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    Mixing oil and fire with a big spoon.
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    4,214
    this sounds a touch familiar! this thread is in the pro chillers sections where this tech can't look...competing companies on the same job?
    You either love bacon or you are wrong.

    4 gallons of gas, 2 miles of travel, teaching my daughters how to drive in the high school parking lot...priceless!

  5. #5
    Join Date
    Jan 2009
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    Really.,/- well hope they get it squared away
    Might see theses guys in the octagon going toe to toe.,

    Can I have ring side seats

  6. #6
    Join Date
    Aug 2006
    Location
    Mixing oil and fire with a big spoon.
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    Quote Originally Posted by milkyway View Post
    ...Can I have ring side seats
    i will sit next to you! you get the popcorn i'll get the beers!
    You either love bacon or you are wrong.

    4 gallons of gas, 2 miles of travel, teaching my daughters how to drive in the high school parking lot...priceless!

  7. #7
    Join Date
    Sep 2008
    Location
    A land down under
    Posts
    306
    Quote Originally Posted by milkyway View Post
    Really.,/- well hope they get it squared away
    Might see theses guys in the octagon going toe to toe.,

    Can I have ring side seats
    Well worth the price of ringside seats if the Canadian Crusher joins the stoush!
    Necessity is the mother of invention

  8. #8
    I was able to override both circuit EXV's to open 100% and compared the two. The one that im working on only open up 50% when looking through the sight glass while the other one looks like a 100% open. Tried banging it with a wrench to see if it was stuck but that did not work. Gonna change out the EXV motor. You guys are funny!

  9. #9
    Increased1


    I was able to override both circuit EXV's to open 100% and compared the two. The one that im working on only open up 50% when looking through the sight glass while the other one looks like a 100% open. Tried banging it with a wrench to see if it was stuck but that did not work. Gonna change out the EXV motor. You guys are funny!

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