Controllers for EWCM 400D PRO compressor racks were designed to manage central cooling with up to 4 compressors of which one has variable capacity. Furthermore, the controller manages the two-step condensation fans or in continuous modulation via inverter. The management of the floating condensation set point according to the external temperature conditions completes the characteristics also offering energy saving functions. The EWCM 436D PRO /A-CRII model is designed for CRii range compressors with capacity modulation