Frictionless centrifugal McQuay employs oil-free, magnetic bearings in order to attain sound levels down to 77 dB. It operates from as low as 0.375 kW/ton IPLV and achieves full load performance as low as 0.62 kW/ton. Requiring less than 5 A to start, chiller uses environmentally safe HFC-134a refrigerant and incorporates MicroTech II controls with Protocol Selectability function. Variable-frequency drives unload chiller to 10% of full load. Absence of lubrication eliminates need for oil heaters, coolers, pumps, and piping. Machine integrates with BACnet, LonWorks, or Modbus communications.