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  1. #1
    Join Date
    Oct 2018
    Location
    Wollongong, Australia
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    2
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    YORK YK with VFD - Loading & Unloading Anomaly

    Hey Legends! Hope you are doing well! First time user and poster.
    We have picked up a site with a few YORK YK Chillers with VFD's. Im unfamiliar with the YORK machines (TRANE for Life) haha and would like to get my head around them. Got a few issues with how they operate. motor at 49hz and inlet guide vanes at 4% with 55% current load, variable flow CHW 14'C in 6.5'C out CDW 24'C in 29'C out, 1.25 D/P no surge being detected. Why is the Chiller running the motor at pretty much 100% and trying to use the guide vanes at such a low position to maintain setpoint. I believe the Turborcors and TRANEs have the guide vanes open 100% and use the motor speed to maintain the setpoint then use the guide vanes last, is this correct or am I going mad?
    Thanks in advance

  2. #2
    Join Date
    May 2012
    Location
    California
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    617
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    Yorks record surge points in a map if it gets corruppted with bad data from cooling tower problems tube problems etc it recods surge point wont run in those conditions ever agian until the map is cleared.

    Also 57 d ew and 44 lw on evap side looks high 13 deg .Delta at that low load

    What is your design data?

    Sent from my SM-G930V using Tapatalk

  3. #3
    Join Date
    Jan 2015
    Location
    Somewhere making cold water
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    Your delta T looks off for PRV not open. Need more data.
    Design information with a good log.

    Sent from my SM-G950U using Tapatalk

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  5. #4
    Join Date
    Oct 2018
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    Wollongong, Australia
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    Thread Starter
    Quote Originally Posted by JEF1980 View Post
    Yorks record surge points in a map if it gets corruppted with bad data from cooling tower problems tube problems etc it recods surge point wont run in those conditions ever agian until the map is cleared.

    Also 57 d ew and 44 lw on evap side looks high 13 deg .Delta at that low load

    What is your design data?


    Sent from my SM-G930V using Tapatalk
    Hey mate,
    Thanks heaps for your response.
    Supply is 12 in 6 out but it was running at minimum flow.
    Do you know the password to reset the surge map. Already logged in with the old 0000 and 1380 but it asks for another code to clear the map.

  6. #5
    Join Date
    Aug 2006
    Location
    Mixing oil and fire with a big spoon.
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    keep in mind the surge map records the Hz, DeltaP and the PRV position. if any of those items are inaccurate, resetting the map won't help...it will just surge at those same points and you will be back to where you started. verify that the pressure transducers are accurate and the PRV position sensor is accurate. then you can reset the surge map.

    most technicians focus on the surge map in the wrong manner. many understand the items i described above but they also think that fixing those items will fix the surge map...it doesn't.

    even with accurate values, many chillers will still surge, record the surge in the surge map and then the chiller will avoid those points...it can still be a frustrating issue. those surge points are real...but some of them can be removed and never have them come back.

    if you have fluid flow issues, a low refrigerant charge, fouled tubes, etc. then you will see a surge at those points. but if you fixed those issues, you wouldn't have a surge at those points at all. so the best way to prevent the issues you are seeing is to fix the chiller, then clear the surge map, then have a trouble-free chiller.
    Don't step on my favorite part of the Constitution just to point out your favorite part.

    Political Correctness is forced on you because you have forgotten decency.

    Technically speaking, they are all heat pumps.

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  8. #6
    Join Date
    Jan 2013
    Location
    United Kingdom
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    Typically we find that some of the surge map points may have been stored when the chillers were being commissioned or set-up, I usually advise techs to return to a site a few months after commissioning , when everything has stabilised and clear the surge map, it takes a year or so to build up an average picture of the seasons and load profiles to plot the map, trouble is most techs either forget to clear the map, can't be bothered or a different tech goes back. If the PRV potentiometer is still accurate, the suction and discharge transducers still accurate and the frequency read-out still accurate then the surge point can be accurate, but, and here is a big but, the chiller can be operating at a stable condition, vanes open 100%, speed as slow as required based on lift, if the customer or the Facility guys then change the flow quickly the chiller will become unstable and possibly surge , a York VFD chiller is , under normal conditions, operating close to surge already so small changes can send it into a surge. You can clear the map , but if the same procedures and conditions exist then it will gradually build up the same 'wall' and you will end up in the same place maybe 6-12 months later. You could try changing the surge sensitivity if it is set to 0.3 , up it a little. OK that was my 'advice ' hat, I cannot pass on the surge clearance code because, from the other point of view, why, when you know nothing about the chillers is the customer paying you as the 'expert' to look after his assets?

  9. #7
    Join Date
    May 2017
    Posts
    10
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    Set the ref float higher and getchya some gas!! Ensure youve got flow and the 80-90f condenser. 50-40f evap. H20. U didnt tell us the approach temp or pressure drop design td, the more info the better. Drop a log on here and we can tell u evenmore

  10. #8
    Join Date
    May 2017
    Posts
    10
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    You wont give him the codes. Ahahahha ive read so many stupid questions on here tonight. “Why do i have to have water flow tonheat up the chiller? Lol” “i cant get my danfoss soft start running on a ucp2 lol”. “ am i low in refrigerant?? “. No info” lol.

  11. #9
    Join Date
    May 2017
    Posts
    10
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    Ill give you the codes. This is getting comical. Fill me in on what happens next please.
    9675
    0228
    1380
    1397

  12. #10
    Join Date
    Apr 2012
    Location
    So.Fl. & NYC
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    157
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    Don’t do it just yet

    Quote Originally Posted by chiller guru View Post
    Ill give you the codes. This is getting comical. Fill me in on what happens next please.
    9675
    0228
    1380
    1397
    Seriously,a lot can happen using the codes without being totally knowledgeable about the chiller operation and controls.
    Use at your own reputations risk.

  13. #11
    Join Date
    May 2012
    Location
    California
    Posts
    617
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    While were at it give me your software version and Ill give you admin password also

    Sent from my SM-G930V using Tapatalk

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