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  1. #1
    Join Date
    Jun 2010
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    80

    Liq. Level set point on a centrifical ?

    What is the purpose of this setup . How does the machine react as it maintains set point and with different condenser loads ? For example , if you had 3/4 of the barrel full of liquid I would probably expect a higher condenser pressure verses if it was 1/4 full of liquid . Am I even in the ball park with analogy ?

  2. #2
    Join Date
    Dec 2010
    Location
    Down by the river
    Posts
    1,664
    Never seen a liquid level s/p on a cetrifugal
    It's hard to stop a Trane. but I have made one helluva living keeping them going.

  3. #3
    Join Date
    Apr 2006
    Location
    mechanical room
    Posts
    1,259
    It's on a York ykcf machine . I think it is a variable orifice in the liquid line between the barrels controlled by a actuator. But Im hoping someone else can shine some light on his subject .

  4. #4
    Join Date
    Dec 2008
    Location
    Dixiana, AL
    Posts
    2,611
    Quote Originally Posted by newbe0507 View Post
    What is the purpose of this setup . How does the machine react as it maintains set point and with different condenser loads ? For example , if you had 3/4 of the barrel full of liquid I would probably expect a higher condenser pressure verses if it was 1/4 full of liquid . Am I even in the ball park with analogy ?
    Liquid level keeps the subcooler covered to gain efficiency. As long as you don't start covering condenser tubes with liquid, the level in a condenser barrel doesn't change the pressure in the barrel any more than the amount of liquid in a drum of refrigerant changes the pressure in the drum.

  5. #5
    Join Date
    Jun 2010
    Posts
    80
    What is a good set point and why ?

  6. #6
    Join Date
    Dec 2008
    Location
    Dixiana, AL
    Posts
    2,611
    Actual number for a setpoint depends on whether or not the guy that commissioned the chiller knows his butt from 3rd base. % can vary depending on calibration. The goal is to just keep the subcooler covered. You can calibrate the controller (which I won't get into here) and you should be able to set at 40% +/- and do well.

  7. #7
    Join Date
    Jun 2010
    Posts
    80
    thanks Klove

  8. #8
    Join Date
    Mar 2003
    Posts
    7,326
    also see them on turbocore machines

  9. #9
    Join Date
    Mar 2007
    Posts
    3,108
    Klove, thanks a lot for your explanation of this. I've wondered about it myself, and I thought it might have had something to do with not starving the evaporator when you're running cold condenser water. I wish I got more inspection and wrench time with the YKs and YTs, but I only get to play with the beige machines.
    "There is no greater inequality than the equal treatment of unequals."

    -Thomas Jefferson

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