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  1. #1
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    May 2007
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    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
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    Post all the operating data for the Chiller without it we would all be guessing as to the cause !
    A mind is like a parachute. It doesn't work if it is not open.

    The best part of going to work is coming back home at the end of the day.

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  3. #3
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    will you tell me what Data points you required.Thanks.

  4. #4
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    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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    A mind is like a parachute. It doesn't work if it is not open.

    The best part of going to work is coming back home at the end of the day.

    Hard work spotlights the character of people: some turn up their sleeves, some turn up their noses, and some don't turn up at all.

  6. #6
    Join Date
    Aug 2003
    Location
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    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
    Building Physics Rule #1: Hot flows to cold.


    Building Physics Rule #2:
    Higher air pressure moves toward lower air pressure


    Building Physics Rule #3:
    Higher moisture concentration moves toward lower moisture concentration.

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