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Cool Star® compressor rack units are used in commercial and industrial refrigeration, for applications such as e.g. supermarkets, retail chains, logistics centres, butchery, meat processing plants and HVAC air conditioning systems.

Parallel connection of 3 or more compressors results in a wide range of cooling capacities and allows capacity modulation according to actual needs.


The units are designed to operate with conventional group A1 HFC refrigerants, depending on the compressor type and operating conditions. Depending on the type of refrigerant used, the range of evaporation temperatures is from -50 °C to +20 °C. For higher evaporation temperatures and / or higher ambient temperatures, the units are equipped with a larger condenser for trouble-free operation. The units are supplied with a protective inert gas fill.

Cool Star® compressor rack units are optimized according to customer specifications.

Standard unit content​

  • steel base
  • compressors
  • liquid refrigerant receiver
  • oil management (oil separator, oil filter and controlled return to compressors)
  • rotalock valves
  • terminal board
  • dual pressure switch
  • individual high pressure pressure switches
  • differential pressure switches for semi-hermetic compressor units
  • pressure transmitters
  • discharge temperature sensor for digital compressors
  • piping
  • electrical connection

Standard compressor series​

  • Copeland Scroll ZR, ZB, ZF, ZF EVI, Copeland Stream
  • Copeland Scroll Digital ZBD and ZFD, Copeland Stream Digital compressors with continuous capacity modulation
  • Bitzer Semihermetic

Optional series

  • electrical switchboard (remote or unit-mounted)
  • crankcase heater
  • air-cooled condenser (remote or unit-mounted)
  • condensing pressure control by fan cycling
  • fan speed control
  • water cooled condenser
  • remote liquid refrigerant receiver
  • outdoor unit cover
  • liquid line (filter drier, solenoid valve, sight glass)
  • suction accumulator
  • heat recovery