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  1. #1
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    Confused 30 HXC medium brine option not installed ???need help from carrier tech

    Hi ,

    We recently came across a new client .

    He have 4 30 hxc chiller ,two of them we're supposed to have brine option..

    Looking at the model number the two last letter are AA not LA.

    LA stand for brine option

    The compressor discharge superheat is high between 40 -70 F
    And the system look like is missing some gas.

    What is the brine option?
    Is it field modifiable ..i.e: orifice size in EXV?

    Thanks

  2. #2
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    Jul 2005
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    modified programming allowing chiller to run lower temperatures(with addition of glycol) than a chiller designed for comfort cooling

  3. #3
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    Thread Starter
    My main concern ain't the programming.
    We've modified the chiller to run on medium brine safety and run to lower temp.

    The problem is glycol ain't the same as water for heat exchange.

    Gpm is ok vs design pressure drop value.But the discharge superheat is around 40 to 70 F ,which is high.
    Discharge superheat target is 22 F.

  4. #4
    Join Date
    May 2006
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    Mooresville, North Carolina
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    I wouldn't worry about the discharge supperheat too much. Just make sure the EXV is below 60%. The brine option includes solenoid valves in the liquid lines and depending on the size smaller orfices in the EXV. There are wires in the wiring harnes that can be used to to control the liquid line valves, but may actually be faster to run your own. The orfices you will have to get from Carrier. Sorry, I don't work for them anymore so I can't get the numbers. Good luck.
    Refer all arguments to the wife, she's better at it.
    www.fairtax.org

  5. #5
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    Jan 2008
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    The unit can be field modified what is your designed leaving water temperature ?

  6. #6
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    Feb 2010
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    Thread Starter
    The chiller as been designed for 33.5 F

  7. #7
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    Jan 2012
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    Quote Originally Posted by patpinet View Post
    My main concern ain't the programming.
    We've modified the chiller to run on medium brine safety and run to lower temp.

    The problem is glycol ain't the same as water for heat exchange.

    Gpm is ok vs design pressure drop value.But the discharge superheat is around 40 to 70 F ,which is high.
    Discharge superheat target is 22 F.
    Am I missing something ? How's more heat removal (heat exchange) gone lower your discharge superheat. I must be missing something

  8. #8
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    Thread Starter
    Quote Originally Posted by jman2794 View Post
    Am I missing something ? How's more heat removal (heat exchange) gone lower your discharge superheat. I must be missing something

    Basically by helping evaporate the liquid refrigerant in the evaporator.

    Less heat exchange could relate to less mass flow of refrigerant coming back to compressor.

  9. #9
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    Jan 2012
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    Dallas
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    Oh. I assume you running high superheat too. I believe somebody had asked what the EXV % POSITION IS? I'm not trying to take over your thread just trying to wrap my head around it

  10. #10
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    Feb 2010
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    montreal
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    Thread Starter
    No problem, I'm trying to help the people that are helping me too

    This compressor is sitting on the barrel so basically there's no superheat that can be taken.

    The exv are at 100 and the condensor seem to be empty of gas as sight glass is bubbling.

    Lirunaway as said earlier in the thread that sometime carrier adding a smaller orifice in the exv probably to prevent shortage of gas I the evap.


    As for the thread thanks to everybody for you're help.

  11. #11
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    Jan 2012
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    Thanks very much

  12. #12
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    Jan 2012
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    Montreal, Canada
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    Quote Originally Posted by patpinet View Post
    Hi ,

    We recently came across a new client .

    He have 4 30 hxc chiller ,two of them we're supposed to have brine option..

    Looking at the model number the two last letter are AA not LA.

    LA stand for brine option

    The compressor discharge superheat is high between 40 -70 F
    And the system look like is missing some gas.

    What is the brine option?
    Is it field modifiable ..i.e: orifice size in EXV?

    Thanks
    You might have to speak to Antonios . He followed a training at Carrier last month or even Dennis he is a damn good tech. Maybe Gweltaz or Etienne too. 😉

  13. #13
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    Feb 2010
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    montreal
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    Thread Starter
    I'll try with Dennis he received some screw training recently. 😀
    Probably he's got some good answers

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