HGZ two-stage compressors

Based on the 6-cylinder compressor HG7, a selection of two-stage variants are available for extended use in intense cooling.
The selection of the liquid intercooler unit is available for three different refrigerants: R404A (R507), R410A, 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:
- a 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