Johnson Controls YORK YZ Magnetic Bearing Centrifugal Chiller

Johnson Controls has introduced the YORK YZ Magnetic Bearing Centrifugal Chiller, optimised for performance with a next-generation low-global warming potential (GWP) refrigerant — R-1233zd(E). Chosen for its efficiency, safety, availability, low environmental impact and cost, non-flammable R-1233zd(E) has an ultralow GWP of 1.

The chiller uses an integral, variable speed drive and advanced magnetic bearing technology that features a single moving assembly suspended in a magnetic field that does not require lubrication. This technology requires 80% less moving parts than traditional oil- or refrigerant-lubricated drivelines. The result is enhanced reliability, reduced maintenance and improved efficiency. Compared to traditional fixed-speed oil-bearing chillers, the company claims it delivers up to 35% annual energy savings.

The chiller can deliver energy savings and lower operating costs by taking advantage of the off-design conditions where chillers operate 99% of the time. The product operates with entering condenser water temperature as low as 4.5°C. The chiller can also operate with condenser temperatures below the evaporator temperatures, eliminating the need for a water-side economiser, which simplifies the system, requires less mechanical room space and saves money on components, piping, controls and maintenance.