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.
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.
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.