Magnetic Bearing Chillers
Anyone have experience with the McQuay magnetic bearing chiller? Thoughts?
They require little maint, no bearings to go bad the parts "float" I think the touchdown bearings are ceramic or some crap really quiet no friction due to bearings. Energy efficient, They are smaller than compared chillers per ton, No oil coolers pumps and heaters.
Heres the specs and theres a video
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Let the machine control the tower on lift.
Orderly shutdowns, not panic stops.
Reset alarms with the touch screen or controller rather than cycling power.
The WMCs I've been around have been fine.
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Chillers seem to be ok. Experienced discharge check valve failures. Smardt and Multistack make alternatives. York and Mcquay have ther own magnetic compressors out at test sites. Mcquay is going to still use Turbocor on there smaller machines.
They work well water cooled.Have not seen a successful air cooled.Anyone else?
The Mcquay product (WME) has been released http://www.mcquay.com/Magnitude
Have had problems with low pessure alarms,Check valves chatter when #2 starts.Turbocore recommend opening vanes up more Mcuay said to raise start speed.
Have found 2 different leaks in brass fitting to alliminum body motor cooling line(2 diff chillers diff comp).Other than that they are sweet machines.They now have a 400 ton
duel and a 500 ton Daiken chiller.They have developed a tt350 for the air cooled market
and in my opinion the future of the industry.Lift seems to be the problem as with all centifugals,these are floating and turning very fast so they are set up to protect themself through software and most of the time you cant see this ,but you interpet
it as a compressor problem,wont speed up ,wont slow down,or wont do tonage.If you pay attention to the performance curves in there manuals they stay within them.
Sorry ,this is getting too long so I end this here.
we have a 250 ton unit and it has been fine, we are finding it puts out a lot of THD (harmonic distortion) especial when it shuts down and starts up.
Have had experience with Smardt chiller with turbocors. Most all issues is controls related. The concept is great and can see everyone going this direction.
I'm part of an energy-saving contract for the military out in the Pacific. Years ago they put in about
two dozen Smardt "oil-free, frictionless" chillers. Why do I say it that way? Cause if you say 'Turbocor'
you get a lot of mean faces with HVAC guys - they've had nothing but problems with them. Faulty
dP sensors, guide vane issues, hard to read the display panel (all CHs are air-cool, so installed outdoor),
dissimilar metal in the condenser assembly (Al + Cu) - not good in the tropics. I hear Smardt is living
up to the warranty and giving support.
So the other day I'm doing a 'photo' tour of the 'Turbocor' (oops, that word!) bldg. One barrack is total
hot and muggy - find out that the chiller tech is working on the unit. He's got the compressor top cover
off and he's got circuit cards laying around. Ask 'what's up?' "Got a few blown fuses, and a problem
with the DC-DC converter" and such. The tells me the gaskets on the compressor is not so keen - weather
gets in. Now doesn't Danfoss manufacture the compressor for Smardt?
Back in the States I've seen McQuay Turbocors - working great - and many good stories about the energy-saving
qualities about them. I'm mean IPLV of 0.33 kw/Ton! That's energy-saving gold.
It's just bothersome to hear about all these Smardt Turbocor issues out here in the So. Pacific. Can't they build
them for climate zone A1 (like Miami). Ok, maybe a 'Typhoon' option might be needed, but the chillers are in
thick-wall outdoor pen for protection. What's the big deal.
I've had similar issues with air cooled. It seems to me that all the manufacturers have a big gap in quality between air cooled and water cooled. Just my two cents.
Cannot speak for Daikin but have several JCI/York YMC2 machines and they have done very well so far. The difference in these machines compared to previous single wheel VSD centrifs is absolutely phenomenal performance and control response. The way they respond to changes in flow and load is unprecedented. No surging/stalling just stable operation. I have seen them start up with 20+ degree colder condenser entering water compared to entering chilled water and never skip a beat. Swapping from 1 to 2 chillers and vice versa, less than 90 seconds from start to stable operation. After 26 years in the industry it takes a fair amount to impress me. These machines
Superheat, that must be REALLY hot.
Right on Turbomaster!
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