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  1. #1
    Join Date
    Mar 2004
    Location
    midwest
    Posts
    954

    Reset of chilled water on York chiller

    has anyone installed leaving water temperature reset on a York YCAS chillers? Want to reset water 44-55F based on outside air temperature.

    no luck with York on this one.
    An astronaut stuck in space was asked by a reporter, "How do you feel?"
    "How would you feel," the astronaut replied, "if you were stuck here, on top of 20,000 parts each one supplied by the lowest bidder?"

    "do it right or do it twice"

  2. #2
    Join Date
    Sep 2007
    Location
    Somewhere in the world.
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    1,595
    Remote Setpoint Reset
    The chilled liquid leaving temperature setpoint programmed
    into the micro can be remotely adjusted to a
    higher value using repeated timed closure of "dry" contacts
    connected to Terminals 13 & 17 of TB4 in the
    logic section of the control panel (See Section 9 [1.12]).
    The duration of the contact closure will decide the
    amount of adjustment. This is achieved as follows :
    The maximum allowable reset value can be programmed
    from 2F - 40F (1C - 22C), as appropriate to the application
    - see Section 6.4. Once the maximum reset is
    programmed, an input contact closure of 11 seconds
    provides the maximum reset. Closure for less than 11
    seconds will provide a smaller reset. For noise immunity,
    the micro will ignore closures of less than 1 second.
    To compute the necessary contact closure time to
    provide a required Reset, use the following steps:
    Reset Temp ={ (Contact Closure - 1sec) X Programmed Max Reset}
    Offset 10 sec
    For example, with a programmed setpoint of 44F (7C),
    after a 4 second pulse and a programmed maximum
    offset of 40F (22C), the temperature offset would
    equal:
    Reset Temp = (4 sec - 1 sec) X 40F
    10 sec
    Reset Temp = 120F sec
    10 sec
    = 12F (6C)
    Arguing with your Boss is like wrestling with a pig in
    mud.
    After a while you realize that while you are getting
    dirty, the pig is actually enjoying it.

    It is not exactly cheating, I prefer to consider it
    creative problem solving.

    25 years ago we had Bob Hope , Steve Jobs , and Johnny Cash today we have no Hope no Jobs and no Cash !
    I can fix broke but i can't fix stupid !

  3. #3
    Join Date
    Mar 2004
    Location
    midwest
    Posts
    954
    thanks for the post. I will run this by tech to see. I was thinking that York would allow a remote BAS signal to interface with there chiller controlls. SO a simple 0-10 or 4-20MA signal would work? I will check your instructions. Thanks
    An astronaut stuck in space was asked by a reporter, "How do you feel?"
    "How would you feel," the astronaut replied, "if you were stuck here, on top of 20,000 parts each one supplied by the lowest bidder?"

    "do it right or do it twice"

  4. #4
    Join Date
    Sep 2007
    Location
    Somewhere in the world.
    Posts
    1,595
    If there is a Microgatway on that Chiller then that could be possible.
    Arguing with your Boss is like wrestling with a pig in
    mud.
    After a while you realize that while you are getting
    dirty, the pig is actually enjoying it.

    It is not exactly cheating, I prefer to consider it
    creative problem solving.

    25 years ago we had Bob Hope , Steve Jobs , and Johnny Cash today we have no Hope no Jobs and no Cash !
    I can fix broke but i can't fix stupid !

  5. #5
    If the BAS is linked to the setpoint control point on the chiller panel you could reset the temperature remotely. I am not sure having such a high chilled water temperature would be ideal. I have typically seen a range of 44F-48F.

  6. #6
    Also include a condenser water temperature reset in addition to the chilled water reset. Improves your efficiency. Use a outside air wet bulb temperature as a reset criteria

  7. #7
    Join Date
    Jan 2009
    Location
    Jersey
    Posts
    126
    you can do pwm direct to the control board, or if it has the optional reset boards you can go voltage or current to the reset board which will do pwm to the control board.

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