Our chiller controllers are designed to control both air-cooled and water-cooled chillers with a variety of different options. Up to 4 total stages of chiller control plus options to manage pumps and system water pressure are just some of the options available. As with all controllers, Prolon has you covered with a variety of safety and efficiency strategies for you to choose from. MicroChiller 3 - Chiller controller - µC3 DIN version, double circuit, 3 compressors, female connectors included. The μC3 is a compact CAREL electronic controller for the complete management of chillers and heat pumps: suitable for air-air, air-water, water-water and condensing units for the management of up to 6 compressors on two circuits.