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  1. #1
    Join Date
    May 2007
    Posts
    168

    York YK Centrifugal Chiller

    We have 3 YK series york chillers R134a cooling capacity 1500 Tons.One of the chiller is surging too much condenser Sub cooling is around 10 Deg F.Its motor is 3.3Kv,Ampares are are fluctuating between 70 to 95.Any body can tell what is possible cause.Thanks.

  2. #2
    Join Date
    Sep 2007
    Location
    Somewhere in the world.
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    1,602
    Post all the operating data for the Chiller without it we would all be guessing as to the cause !
    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.

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    I can fix broke but i can't fix stupid !

  3. #3
    Join Date
    May 2007
    Posts
    168
    will you tell me what Data points you required.Thanks.

  4. #4
    Join Date
    Jan 2011
    Posts
    1,157
    All the data you would normally take during an operating inspection. Entering and leaving CHW temps, same for condenser, evaporator pressure, discharge pressure, saturated suction, saturated condenser, discharge temp, liquid level in the condenser...you get the idea.

  5. #5
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    Sep 2007
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    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 !

  6. #6
    Join Date
    Aug 2003
    Location
    Fort Worth, TX
    Posts
    11,326
    What chiller surging basically is: when there is too high of a pressure difference between the condenser and the evaporator for the non-positive displacement compressor to overcome. As a result, gas flow reverses across the impeller wheel, attempting to stall it. This happens in spurts and is why amp draw fluctuates wildly during surging events...the impeller is working against gas flowing in the wrong direction.

    Basic causes:

    Fouled cooling tower

    Fouled tower sump and/or condenser pump strainers

    Fouled condenser tubes

    Failure to lower entering condenser water supply setpoint when chiller load is low

    Charge not trimmed correctly
    • Electricity makes refrigeration happen.
    • Refrigeration makes the HVAC psychrometric process happen.
    • HVAC pyschrometrics is what makes indoor human comfort happen...IF the ducts AND the building envelope cooperate.


    A building is NOT beautiful unless it is also comfortable.

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