Semi-Hermetic Compressors HGZ Two-Stage Compressors

Based on the 6-cylinder compressor HG7, a selection of two-stage variants is available for extended use in intense cooling. The selection of the liquid intercooler unit is available for three different refrigerants: R404A (R507), R410A and R22. Basically it concerns different expansion valve assemblies. Therefore in the further descriptions only one option (e.g. HGZ7/2110-4 R22) is indicated.

The optional two-stage system is composed of:

  • Liquid supercooler
  • Expansion valve
  • Solenoid valve
  • Sight glass
  • Filter dryer

The two possible optional variants of the HGZ7:

1. Design 
Intermediate pressure line mounted and insulated
Liquid supercooler, expansion valve, solenoid valve, two sight glasses, filter dryer everything enclosed separately for individual, external mounting.

2. Design 
Liquid supercooler, expansion valve, solenoid valve, two sight glasses, filter dryer attached directly to the compressor, lined and insulated.

The highlights

  • Six-cylinder construction
  • Stages divided into LP / HP at the ratio of 2 : 1
  • Two-stage operation with liquid supercooler
  • Expansion valve adjusted to refrigerant and application
  • Extremely economical and reliable concept
 
HGZ two-stage
Current types Displacement at 50 Hz (1450 rpm) m³/h
HGZ7 93.7 / 46.9 107.6 / 53.8 122.4 / 61.2
HGZX7 93.7 / 46.9 107.6 / 53.8 122.4 / 61.2

More information about the HGZ two-stage compressors (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 HGZ two-stage compressors