The MC3 SC is a step controller for controlling a maximum of eight compressors and eight condenser fans based on the measured suction and discharge pressure and its setpoints.

The MC3 hardware platform offers a suitable solution for each cooling unit. Two versions are therefore available as standard: The MC3-SC and the MC3-SC2 (for smaller units), the choice depends on the number of required inputs and outputs.

The MC3-SC is installed on a DIN rail in a control box from which all of the cooling unit stages and variables are controlled.

The following selection options are available for switching the controller on and off:

• Compressor:  Control on/off , With or without valve lifting (multi-stage compressor), Frequency controlled or variable slide control
• Condensor: Control on/off, Frequency controlled (EC fans)

The MC3-SC2DC variation has been specially developed for controlling a monoflow system for optimum efficiency.