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Thread: Trane screw chiller
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11-15-2012, 12:00 AM #1
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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?
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11-15-2012, 12:26 AM #2
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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?
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11-15-2012, 07:25 AM #3
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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
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11-15-2012, 09:22 AM #4
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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?
The weak aren't destroyed by the strong.
The weak are destroyed by the under-estimated.
I know a famous song that ends in 'my nose'. The artist is dead. Know who?
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11-15-2012, 09:35 AM #5
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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
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11-15-2012, 09:16 PM #6
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i will sit next to you! you get the popcorn
Originally Posted by milkyway
i'll get the beers! 
The weak aren't destroyed by the strong.
The weak are destroyed by the under-estimated.
I know a famous song that ends in 'my nose'. The artist is dead. Know who?
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11-15-2012, 10:15 PM #7
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Well worth the price of ringside seats if the Canadian Crusher joins the stoush! Originally Posted by milkyway
Necessity is the mother of invention
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11-15-2012, 11:56 PM #8
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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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11-16-2012, 12:02 AM #9
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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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