HGX24e CO2 LT Subcritical 4-Cylinder Compressor

The BOCK CO2 subcritical 4-cylinder specialist compressor for low temperature applications with extraordinary requirements: HGX24e CO2 LT.


When it comes to rare or challenging specifications the BOCK HGX24 CO2 LT compressor is your reliable partner for low temperature applications with high LP standstill pressures up to 100 bar.  HGX24e CO2 LT is designed for evaporating temperatures from -50°C to 0°C, condensing temperatures up to 25 °C for example or for wide frequency bands, as well as wide operating limits.


The latest BOCK LT subcritical compressor combines 6 capacity stages in only one model and reaches stages from 4.6 to 12.7 m3 / h (50 Hz). The HGX24e CO2 LT is available in motor versions ML and S and provides a flexible use for cascade and booster CO2 applications in supermarkets, as well as for commercial and industrial cooling. 


The new highlight of our CO2 compressor range for low temperature (LT) with high standstill pressures!


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HGX24e CO2 LT subcritical compressor

  • Perfect for high standstill pressures up to 100 bar
  • Cooling capacity range from 23-69 kW
  • Provides 6 capacity stages
  • Capacity stages: 4.6 – 12.7 m3/h* (50 Hz)
  • Evaporating temperature: -35°C at 50 Hz
  • Considering temperature: -5°C
  • Suction gas superheat: 10 K, subcooling: 0K
  • High efficiency
  • Designed from the proven BOCK HG series for the use with R744 systems
  • Extended frequency band
  • Enlarged operating limits
  • 2 motor sizes ML** and S**
  • Flexible use for cascade and booster CO2 applications
  • Increases operational reliability reduces the risks for malfunctions
  • Reduces operating and services costs for systems with frequent, extended downtime

* For higher capacities in low temperature applications with standstill pressures up to LP 100 bar, the HGX34 CO2 T and HGX46 CO2 T are available in the ML version with 12 displacement stages.
** ML for standard cooling and low temperature applications / S for frequency control and enlarged operational limits


Special features

  • High compressor efficiency for lowest operating costs
  • Long-life compressor design
  • Broad limits of application and large frequency range for a wide variety of uses
  • Reliable and safe oil supply through pump lubrication
  • Good operating characteristics with low vibration, pulsations, and low operating noise
  • Pressure relief valves for the suction and pressure area

The BOCK HG LT series soon will be updated with HGX12e CO2 LT*** 2-cylinder compressor

*** Expected available beginning of 2022


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4-5,5 kW / 3-9 HP (motor code)

Type of compressor

Semi-hermetic reciprocation subcritical



Maximum pressure

LP/HP 100/100 bar

Number of cylinders


Displacement range

4,6 – 12,7 m3/h (50 Hz)

Variable/single speed

Variable: 30-70 Hz

Cooling capacity

8 – 23 kW @ to/tc/toh/f = -35°C/-5°C/10K/50 Hz

Discharge gas temp

Depends on operating conditions – on request

Power consumption

Depends on operating conditions – on request




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