By TEKO, published May 09, 2017

The ROXSTAindustrial series meets the demands of the industry, food production and logistics industries. The transcritical COseries provides a high level of flexibility in order to satisfy customer needs and completely meet the demands within the kinds of use.


  • Clever design for individual use
  • Stable/heavy construction
  • Semi-modular for transport and installation
  • Medium temperature cooling, low temperature cooling, heat pump, air conditioning, parallel, ejectors
  • Capacites from 150 kW
  • Diverse implementability of special demands

Design pressure

  • 30 (60*) bar suction line (low temperature)
  • 45 (60*) bar suction line (medium temperature)
  • 60 (80*) bar medium pressure
  • 120 bar high pressure side

* Optional at additional price

Completely mounted and tubed unit

  • Transcritical and subcritical COreciprocating compressors by Bitzer or Frascold
  • Guide compressor with frequency converter
  • Ball stop valves
  • High and low pressure packages
  • Pressure Cut-Out for high pressure and safety protection, non-adjustable, type approved according to compressor
  • Safety valves for high/medium pressure and suction side (optional redundant)
  • Muffler for pulsation damping in the common
  • All switching devices which are necessary for fully automatic operation
  • Electric components are labelled according to German standards
  • Ventilation of the switchboard Main switch Control transformers Switchboard with electronic control - Wurm Systeme
  • Independent power supply closes the high and medium pressure valves in case of power failure discharge line
  • Insulation on suction side (19 mm insulation)
  • Medium pressure receiver (250 L / 2 x 250 L)
  • Sensor at the outlet of the gas cooler
  • Level control
  • Insulation of the medium pressure vessel
  • Valve for post-injection
  • Stop valve after filter-drier and sight glass
  • Flash gas and suction line heat exchanger (medium/low temperature cooling)
  • Active liquid subcooling
  • Subcooling plate for gas cooler (optional)
  • Antivibration pads


  • Can attach an exterior chiller. In southern countries, the additional cooling of the refrigeration circuit can keep a transcritical unit energetically stable. In doing so, sensitive products are protected.
  • Eco-operation. Especially in high capacity ranges (> 80 kW), an Eco-parallel compression can provide significant advantages concerning efficiency. It improves the COP of the units and consumes less power. Ejectors can also be integrated.
  • For longer piping paths or bigger height differences within the piping network, the ROXSTA-series contains active subcooling of the refrigerant. The differences in temperature within a unit are reduced, the behaviour of the unit also remains stable when the distances are longer.


  • Industrial refrigeration

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