Semi-Hermetic Compressors HG CO2 T Compressors Transcritical

The compressors are used in transcritical and subcritical applications for supermarkets, commercial, industrial refrigeration and heat pumps.

  • Gas-cooled semi-hermetic reciprocating compressor
  • Operating pressures of up to 130 bar
  • Displacement from 9.9 to 38.2 m³/h (50 Hz)
  • Designed for transcritical CO2: Standstill pressures LP 100 bar / HP 150 bar
  • Highest efficiency in the market with EER/COP of more than 1.85 (50 Hz [1450 U/min], evaporating -10°C, gas cooler outlet 35°C/90 bar, superheat 10 K)

Important information

  • CO2 applications require new kind of system and control.
  • They are not a general solution for the substitution of F-gases.
  • Notes in the assembly manual regarding the handling of CO2 compressors must be followed.
  • Therefore, we would specifically draw your attention to the fact that this information is presented according to our current level of knowledge and may change at any time due to further development.

Special Features

  • Highest compressor efficiency for low operating costs
  • High durable compressor design
  • Reliable and safe oil supply through pump lubrication
  • Low oil carry over
  • Good operational characteristics with low vibration, low pulsation and low noise level
  • Wide operating limits and wide frequency range (20-70 Hz) for different applications
  • Pressure relief valves on LP and HP
  • Long experiences with transcritical CO2 compressor (since 1993)
Think green, choose blue.

ASERCOM certified


The collected outstanding performance data has also been confirmed officially through ASERCOM (Association of European Refrigeration Component Manufacturers). Therefore the compressors contribute to lowest life-cycle costs and comply with long-term legal requirements such as the F-gas regulation in Europe.



CO2 compressors transcritical program

3 model sizes with 14 capacity stages from 6.2 to 38.2 m³/h (50 Hz)

HG CO2 transcritical
Current types Displacement at 50 Hz (1450 rpm) m³/h
HGX2 CO2 T 6.2 7.7

HGX34 CO2 T 9.9 11.3 12.9 14.5 16.3 18.2 20.1 25.5
HGX46 CO2 T 24.4 27.2 30.2 38.2

More information about the HG CO2 T compressors transcritical (e.g. technical/performance data, drawings, spare part lists, operating limits) can be found in the compressor selection tool VAP via the following link: VAP compressor selection HG CO2 T compressors transcritical

Video about the HG34 & HG46 CO2 T compressor