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  1. #1

    Need some help:(

    We have Trane RTHD in our plant which is installed 2 months ago.We are having oil loss at compressor problem.We are using directly river water in condenser and we have a variable cooling need conditions.The river water temperature is 11-13 C in this winter.Altough head pressure,oil pressure,refrigerant luquid level is OK we sometimes face oil loss problem.

    Evap entering water 1.2C
    Evap leaving temp -2.8C
    Condenser entering water 12C
    Condenser leaving water 13C

    Evap refrigerant pressure 136
    Condenser ref. pressure 400

    Evap app. temp : 3-4 C
    Condenser app. temp: 1-2C
    Load: %42

    Chiller works in above conditions about 75-80 minutes.Then as we dont have cooling need so much it goes to;
    Evap entering water -1.7C
    Evap leaving temp -3C
    Condenser entering water 12C
    Condenser leaving water 12.5C

    Evap refrigerant pressure 128
    Condenser ref. pressure 360

    Evap app. temp : 2 C
    Condenser app. temp: 0.8C
    Load: %26

    But after working 6-7 hours while in above conditions the chiller goes to "oil loss"
    İs this because of cold condenser water?If I can warm it up to 20 C then is everthing going to be OK?

    Many thanks for asnwers

  2. #2
    Join Date
    Mar 2012
    Location
    montreal/canada
    Posts
    81
    This runs on what refrigerant and when u say it runs at 400 is that psi,and yes condenser water is to cold

  3. #3
    Join Date
    Mar 2012
    Location
    montreal/canada
    Posts
    81
    You must have the design sheet of the chiller ,that will tell you what should be the entering and leaving temp for the evap and cond and the gpm

  4. #4
    Join Date
    Oct 2011
    Location
    La.
    Posts
    280
    WARRANTY!!!!!!!! Call Trane.

  5. #5
    Join Date
    Mar 2004
    Location
    ottawa canada
    Posts
    2,045
    No condenser water temp control , no water treatment ..........Kiss the Warranty goodbye ...its in great big print in the IOM and on labels on the chiller .
    The 64 roars to life Whoo hoo ...shes a rolling chassis .
    You bend em" I"ll mend em" !!!!!!!
    I"m not a service tech.. I"m a thermodynamic transfer analyst & strategic system sustainability specialist
    Best Austin Healey In Show twice in 2013 .....All those hrs paid off .

  6. #6
    We have a condenser regulating valve in the outlet of condenser and works when the head pressure is under limits(1,7 bar).The data sheet says;

    Evap. entering temp 2 C
    Evap leaving temp -3 C

    Condenser ent. temp 25 C
    Condenser leaving temp 30 C

    But it also says you can use cold water minimum 12.5C and as far as I know cold water means lower power suction.

  7. #7
    Join Date
    Mar 2004
    Location
    ottawa canada
    Posts
    2,045
    Read the rules at the top of the page .....NO DIY ......... CALL A PRO
    The 64 roars to life Whoo hoo ...shes a rolling chassis .
    You bend em" I"ll mend em" !!!!!!!
    I"m not a service tech.. I"m a thermodynamic transfer analyst & strategic system sustainability specialist
    Best Austin Healey In Show twice in 2013 .....All those hrs paid off .

  8. #8
    Join Date
    Mar 2007
    Posts
    3,108
    Quote Originally Posted by Healey Nut View Post
    Read the rules at the top of the page .....NO DIY ......... CALL A PRO
    Who said anything about DIY? If the machine is only two months old, I agree that the owner should have Trane come out and look at the thing.
    "There is no greater inequality than the equal treatment of unequals."

    -Thomas Jefferson

  9. #9
    Join Date
    Jul 2007
    Location
    The Hot South
    Posts
    1,313
    Why don't you convert all the temps to F and pressures to PSI for the metrically challenged.

  10. #10
    Join Date
    Mar 2012
    Location
    montreal/canada
    Posts
    81
    Okan convert pressures and temps to psi and degree F like R123 said ,and explain more ur operation of the valve at the outlet of ur condenser and I still say water in at the condenser is to cold bring that up to 25 c

  11. #11
    Join Date
    Oct 2011
    Location
    La.
    Posts
    280
    This is the problem with us in America. The entire word uses metric units, we even signed an agreement to start converting to it. However, we are cowboys and refuse to learn new ways. So to the rest of the world, if you want an Americans help, convert to imperial units please. We are to lazy to learn it!
    Thank You, for understanding our limitations.

  12. #12
    Join Date
    Sep 2008
    Location
    A land down under
    Posts
    308
    Is the chiller controlling the cond water reg valve or is this external control, the chiller does not need to be controlled to have 25 Deg C ECWT provided the refrigerant differential pressure is being made. The chiller can control this directly by throttling the CLWT. I also agree with Graham, Healay Nut - if your running direct river water for the condenser you are going to run into serious issues sooner than later with the heat exchanger. Not sure why this is a product warranty issue, sounds like installation issues to me on information available
    Attached Files Attached Files
    Necessity is the mother of invention

  13. #13
    Join Date
    Oct 2011
    Location
    La.
    Posts
    280
    I am sure that a Trane service person started the chiller and performed a commisioning report. During this time the start up tech should have explained the unit's limitations if any and configured the condenser water flow valve, if it was supplied by the Trane branch. Anyone who works on ships or chemical plants by a water source will have experienced this before. Not the end of the world, just some problems to contend with. This is a Trane problem as the sales guy sold them this chiller and they knew where it was going. The only problem is who pays for it "Trane warranty department or the sale department."

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