Trane CVHB Loss of motor coolant
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  1. #1
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    Aug 2011
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    Philadephia
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    Trane CVHB Loss of motor coolant

    Looking for feedback if anyone has seen a trane
    cvhb lose motor coolant while rest of the machine runs normally? There is no restriction in supply line off economizer, both orifice plates are clean. liquid appears to be flashing right out of economizer on motor coolant line but evap level seems fine. Any input appreciated, Thanks, Greg

  2. #2
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    Mar 2004
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    ottawa canada
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    1,993
    Does the motor cooling line have a sight glass on it, is there a drier or filter shell in the line , whats the symptoms . Readings would help too
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  3. #3
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    Aug 2011
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    Philadephia
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    There is no sight glass on the supply line, there is a sight glass on the return that is completely empty. there is a single core drier housing with a filter in the supply. I tried removing the filter and running the chiller without one but there was no change. I ran a 1/4 inch hose frome the filter housing to the evap and was unable to establish a steady stream of liquid. Everything looks normal except the motor is overheating. I seem to be flashing before I get to the filter. Thanks

  4. #4
    Join Date
    Mar 2007
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    3,103
    What's the system differential pressure? What are your entering condenser and chilled water temps? Do you know that the motor is actually overheating, or is it a sensor telling you so? Could the machine be extremely low on charge?
    "There is no greater inequality than the equal treatment of unequals."

    -Thomas Jefferson

  5. #5
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    Aug 2011
    Location
    Philadephia
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    condenser water was around 75 in and 80 out. Cond. pressure was 3# , Chilled water was 48 in, 41 out. Evap presure was 15 or 16". The motor tripped the High motor temp switch on the customer and was still 150 degrees when I arrived. I monitored it with an infared when I ran it an it's definitely getting hot. I pulled the charge and got out 2350# , The name plate charge is 2500#. I'm sure I left a hundred in the machine so I don't think the charge was an issue. The machine put out 41 degrees without problems the previous 24 hours.

  6. #6
    Join Date
    Aug 2010
    Location
    Middle GA
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    I have heard of one machine that had similar problems. The chiller had had a regasket about 6 months prior. They ended up tearing the chiller back down and found a rag that had accidentally been left in the condenser. It had migrated to the orifice plate and partially blocked it causing a motor overheating problem.
    Not sure if it even helps, but it is a good story.

  7. #7
    Join Date
    Mar 2007
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    3,103
    Well, that's a weird one. Condenser approach seems a little high, but I don't think that is the problem here. Seems like there is a blockage, restriction, or kink, or something of that nature.
    "There is no greater inequality than the equal treatment of unequals."

    -Thomas Jefferson

  8. #8
    Join Date
    Aug 2009
    Location
    Prattville, Alabama
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    When you pulled the charge, how do you estimate how much is left in? And why was it left in? Why go that far and then stop? Were those readings from the control panel? Is the control panel UCP1? Suggest backing up all readings with your test instruments. You mention no problems the previous 24 hours - why was this timeframe mentioned? Did something happen prior to that, like chiller was rebuilt or started after a long downtime? What is temperature of motor cooling supply line?

  9. #9
    Join Date
    Mar 2007
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    3,103
    Maybe the gauges he is looking at are showing 16" and 3# because they have been showing the same pressures for 25 years and now they are stuck... lol

    Maybe the actual pressures are more like 10" and 6", and a pin broke off in the vane linkage and now the machine is running with next to no differential pressure to move the motor coolant around and the inlet guide vanes are completely closed. It's no more strange than the thread where the pre-rotation vane shaft disengaged from the vanes on the York YT and the machine was running with them all the way closed.

    Or maybe it's just a rag.
    "There is no greater inequality than the equal treatment of unequals."

    -Thomas Jefferson

  10. #10
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    Quote Originally Posted by lunchbox View Post
    ...The chiller had had a regasket about 6 months prior. They ended up tearing the chiller back down and found a rag that had accidentally been left in the condenser....
    it was 45 minutes later....and STOP BRINGING IT UP! i have heard enough of it already! (it only happened 1 more time since then but i had an apprentice that appearantly i wasn't watching enough.)

    one of the guys at our shop had a 6 year old CVHE that had never been opened up lose all of its oil pressure in 1 night. after several days of trying to figure it out, we found the oil supply line completely plugged with a 515 slug that was 6" long...no idea how it got there, passed the oil pump or anything...never had the problem since in any machine configuration.
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  11. #11
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    Quote Originally Posted by jayguy View Post
    it was 45 minutes later....and STOP BRINGING IT UP! i have heard enough of it already! (it only happened 1 more time since then but i had an apprentice that appearantly i wasn't watching enough.)

    one of the guys at our shop had a 6 year old CVHE that had never been opened up lose all of its oil pressure in 1 night. after several days of trying to figure it out, we found the oil supply line completely plugged with a 515 slug that was 6" long...no idea how it got there, passed the oil pump or anything...never had the problem since in any machine configuration.
    So now that is twice it has happened????

  12. #12
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    Quote Originally Posted by lunchbox View Post
    So now that is twice it has happened????
    that you know of!
    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!

  13. #13
    Join Date
    Oct 2011
    Location
    Upstate NY
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    55
    Keep us posted on what you find Greg...

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