Screw chillers have stepless control

Clivet’s Class A chillers have screw compressors and come as water-cooled and air-cooled versions. They use R134a and have stepless capacity control. EER is greater than 3.1 on air-cooled models and over 5.0 on water-cooled units.
Energy-saving features include electronic expansion valves and tube evaporators with counter-flow design.