Johnson Controls Building Efficiency: Centrifugal Chiller
July 5, 2010
The York® Magnetic Centrifugal Chiller (YMC²) offers efficiency and sound performance. The chiller is 10 percent more efficient than conventional, variable-speed chillers, utilizing magnetic-bearing technology to eliminate mechanical-contact losses in the driveline, claims the company. It features a quiet, sustainable design. The OptiSpeed™ variable-speed drive has been improved, and efficiency of the evaporator has been enhanced with an advanced “falling-film” design. Magnetic-bearing technology eliminates nearly all driveline vibration, and the OptiSound™ control further reduces noise at off-design conditions. As a result, the chiller operates at a maximum of 73 dBa at full-load standard conditions, per Air-Conditioning Heating and Refrigeration Institute Standard 575. The YMC² chiller features a sustainable design that uses refrigerant HFC-134a, which has zero ozone-depletion potential. The chiller also increases uptime and reduces maintenance costs. The magnetic-bearing drive has fewer moving parts and eliminates the oil lubrication system. The driveline is field-serviceable, which means a back-up driveline is not needed. The chiller’s permanent-magnet motor has an inherently longer life than traditional motors, and the OptiSpeed drive’s soft-start sequence further extends motor life.
Johnson Controls Building Efficiency, Milwaukee, WI; www.johnsoncontrols.com/ymc2