Johnson Controls is reaching advanced levels of efficiency at even higher capacities with the launch of its expanded YORK YZ Magnetic Bearing Centrifugal Chiller platform.

Extending the use of magnetic bearings up to 2,020 tonnes gives more customers the opportunity to experience reduced driveline maintenance and lower operating costs.

Johnson Controls showcased the extended capacity YORKYZ Chiller unit at the 2020 AHR Expo last month.

This expansion in capacity builds on the YZ chiller that is optimized around R-1233zd(E) and utilizes an inherent series counterflow design with patented heat exchangers.

The YZ chiller design tackles real world energy challenges with the largest operating map in the industry to support the most challenging climates – including the Middle East where the YZ chiller recently launched.

Vice president and general manager for applied equipment at Johnson Controls, Laura Wand, said the advanced, aerodynamic design includes two, single-stage compressors that are paired in a series counterflow arrangement, reducing the lift on each compressor to improve overall full-load and off-design performance.

“The dual compressor design allows for each compressor to run individually, providing redundancy and improved off-design performance at lower loads,” Wand said.

“The design also increases turn down capabilities at low loads by continuing to provide cooling on one circuit in the unlikely event of a failure or an unplanned shutdown.”



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