York YK-EP Efficiency Plus water-cooled centrifugal chillers use a patent-pending mechanical compression economizer cycle to make it more efficient than single-stage chillers.

Designed by Johnson Controls, the new chiller is suited for large capacity applications such as large central plants and gas turbine inlet-air cooling. The unit can operate with low entering condenser water temperatures down to 55°F (12.7°C). It includes a variable-speed drive that can accept medium or high voltage power. The control panel allows enhanced chiller control and integration with building management systems.