VFD/VVR Compressors

New HallScrew compressor range with built in VFD and VVR.

J & E Hall has now launched a new range of HallScrew compressors with built-in variable frequency drive (VFD) and variable volume ratio (VVR) for refrigeration applications.

Variable Frequency Drive (VFD) Technology 
The new HallScrew compressor offers the most efficient way of adapting  the capacity of the compressor to the requirements of the load.  Inverter technology allows the compressor motor speed to vary and optimise power to create a precisely controlled  temperature.  This proves to be significantly more efficient than operating the compressor at fixed speed with slide control and can save up to 23% in energy consumption. 

Variable volume ratio (VVR) 
VVR allows the volume ratio to be adapted by moving the loading valves. In essence, the VVR adapts the point at which the refrigerant leaves the compressor which changes the pressures at discharge.  By doing this the volume ratio of the compressor is optimised for any running condition. Hence, reducing energy consumption further. 

  • Ease of installation
  • Ease of mainenance
  • Engineered for quiet operation
  • Outstanding reliability
  • Superior efficiency
  • Wide ranging cooling capacities 
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