oil side maint goes away. but electronics are more robust. I think the glued on bottle cap goes away....
winter work essentially the same
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.
Politicians need to be changed like diapers, and for the same reason.
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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
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.Originally Posted by DFZ
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.
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.
Politicians need to be changed like diapers, and for the same reason.
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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.
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˛.Originally Posted by Gib's Son
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.
Politicians need to be changed like diapers, and for the same reason.
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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.
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.
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!
Politicians need to be changed like diapers, and for the same reason.
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York just started using the mag bearings in the navy chillers, there are none installed on any ships yet.
To clarify...I did not mean to infer that York has been using mag bearings in the Navy, but that the Navy has been using mag bearings for years.
I'm third party to information, so it is filtering in. The 3 grand difference I previously referred to is operating cost/ year, not cost between the two technologies. The local is in S. Dakota and electrical engineer seems to think they have fairly reliable power, and clean. Site has emergency generators that when tested should not affect the chillers; except when loss of power occurs, projected at 6 times/ year. Question is sent to facilities to find out if that is realistic.
The mag chiller is the YMC^2, the other chiller proposed is a YK series.
Politicians need to be changed like diapers, and for the same reason.
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find an old r-123 YT and put that in.
This chiller has no way to tell if you have a HARD LANDING , and by the way the only way you can have a HARD LANDING is to cut the cables from drive to motor, a power loss is not a hard landing ,just came back from the test lab at york on this chiller. This chiller will make you very happy,also the next ymc2 will have, oh sorry i can not tell you about it.
Or if the the drive craters...which many did prior to bringing it to market. I know you are still drinking the kool-aid. I have not heard any glowing reports of any of the YMC˛ chillers as of yet. Don't get me wrong I am a huge fan of York equipment, but the JCI purchase of York International did absolutely nothing to make the product better. IMO they are slowly making it worse. Bringing the YMC˛ to market before it had a reliable VSD was a mistake. They are trying to play catch-up with the other manufacturers who are using the Turbocor compressor.Originally Posted by YorkMech3
I'd like to see the mag drive chillers for Navy use. My money says they are non-existent. I don't think they'd survive the depth charge testing. Watch this video and listen at about 50 seconds to how cleverly Mr. Montagne chooses his words. He says nothing about mag bearings on Navy ships.
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You may have surmised this by now, but a hard landing is when power is lost and the rotating assembly sits down hard on the bearings. What is supposed to happen is that when the compressor is given a "stop" command and the rotation stops the magnetism of the bearings dissipates and gently sets the rotating assembly on the bearings. What York has attempted to do is have a capacitor bank that supplies the necessary power to keep the shaft levitated until coast down was complete. I heard that wasn't working too well for them.Originally Posted by Gib's Son
Yep, got that figured out. The capacitor stuff is good info.
Politicians need to be changed like diapers, and for the same reason.
Mark Twain