Chiller bearings
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  1. #1
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    Chiller bearings

    Can anyone tell me what maintenance difference there would be with going with magnetic bearings vs conventional? Looking some 300 ton Yorks. The cost difference is not that much. Need to know for a life cycle cost analysis. Thanks in advance.
    If a nation expects to be ignorant and free, in a state of civilization, it expects what will never be. (Thomas Jefferson 1816)

  2. #2
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    oil side maint goes away. but electronics are more robust. I think the glued on bottle cap goes away....

    winter work essentially the same

  3. #3
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    make sure you have reliable power before installing a mag bearing unit, the coast down bearings for power failure are one time use, after a no power coast down you need to rebuild it and replace them.

  4. #4
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    Quote Originally Posted by DFZ
    make sure you have reliable power before installing a mag bearing unit, the coast down bearings for power failure are one time use, after a no power coast down you need to rebuild it and replace them.
    With regard to the York YMC˛, that statement is just not true. There is some capacitor storage that aids in coast down. I think the quote was 10 "hard" landings.

    My opinion of the YMC˛ is that it didn't have sufficient reliability testing before it's release. I am also of the opinion that the YMC˛ is pricey. I find it interesting when you say there isn't much difference in price. 'Round here we find them to be at a premium price.

  5. #5
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    Quote Originally Posted by KnewYork View Post
    With regard to the York YMC˛, that statement is just not true. There is some capacitor storage that aids in coast down. I think the quote was 10 "hard" landings.

    My opinion of the YMC˛ is that it didn't have sufficient reliability testing before it's release. I am also of the opinion that the YMC˛ is pricey. I find it interesting when you say there isn't much difference in price. 'Round here we find them to be at a premium price.
    I agree that these ymc units did not have sufficient testing, I worked with one of the first in service at a local college, POS! It has gotten better, but I still would not put my trust in one of these machines yet. just my opinion. This machine has had a few hundred or more hard landings, the bearings still seem to be ok.

  6. #6
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    Quote Originally Posted by Legacy80 View Post
    I agree that these ymc units did not have sufficient testing, I worked with one of the first in service at a local college, POS! It has gotten better, but I still would not put my trust in one of these machines yet. just my opinion. This machine has had a few hundred or more hard landings, the bearings still seem to be ok.
    there were also issues "A LOT" with the drives on these chillers.

  7. #7
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    There was a difference of roughly 3 grand, which IMO is peanuts for a 25-30 life span. The owner is interested in life cycle costing so I am trying to find out if they require more or less maintenaince.
    If a nation expects to be ignorant and free, in a state of civilization, it expects what will never be. (Thomas Jefferson 1816)

  8. #8
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    Quote Originally Posted by Gib's Son
    There was a difference of roughly 3 grand, which IMO is peanuts for a 25-30 life span.
    I wish I could see the model numbers and the quotation...it's not that I don't believe you. I'd want to show them to our equipment sales rep. We pay about $100/ ton more for the YMC˛.

  9. #9
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    Mag bearings have been around for a long time, in the Navy and marine world from what I understand. Seems to me the first time I heard of commercial HVAC applications was about 10 years ago. Idaho is about 10 years behind the rest of the country. LOL. That's what it felt like when I move here anyway.

    So far I am getting it's about a push for maintenance, and you better have good and reliable power.
    If a nation expects to be ignorant and free, in a state of civilization, it expects what will never be. (Thomas Jefferson 1816)

  10. #10
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    That stuff about York using mag bearings in the Navy chillers is 100% and I repeat 100% BS. York has not used magnetic bearings other than a couple of OM systems. I would shy away from the York offering and use a chiller with Turbocor compressors if I absolutely had to have magnetic bearings.

  11. #11
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    if you are concerned with lifecycle costing, you should take a serious look at the smardt machines paired with a cpecs control ackage. The total plant package will give you very good performance numbers that many wont believe.

    The york machines still have some bugs that others have gotten past. Real good power is critical, with no noise on your ground whatsoever.

  12. #12
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    Ok, a few more questions: What is a "hard landing"? I have an idea, but do not want to assume...we all know the saying. What is the YMC2?

    I'm not sure if owner is locked into York or not. Only that they looked at screws vs cyntrif. and decided upon the latter. This is a Govt. job so scrutiny is....well, typical of Govt. jobs. I just don't have the first hand working knowledge of this stuff as my career path has taken me away from allot of hands on work. I appreciate all of your input!
    If a nation expects to be ignorant and free, in a state of civilization, it expects what will never be. (Thomas Jefferson 1816)

  13. #13
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    Aug 2011
    Location
    York, PA
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    York just started using the mag bearings in the navy chillers, there are none installed on any ships yet.

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