Efficient, robust, durable: thanks to the HSK/N version, HS semi-hermetic screw compressors are suitable for many application ranges and refrigerants. The internal capacity control is multistep and, from HS.85, stepless as an optional feature. All HS compressors are suitable for speed-controlled operation. From HS.95 with IQ MODULE.

Based on decades of experience, these series are designed for the specific needs of railway air-conditioning systems. Thanks to generously sized roller bearings, the compressors are exceptionally reliable with a long service life. Their large frequency range provides optimal full- and part-load efficiency.

The OS series separates the flanged motor and refrigerant circuit. Thanks to the OSK/N version, these compressors are suitable for many application ranges and refrigerants, with a separate series for operation with ammonia. The internal capacity control is multistep and, from OS.85, stepless as an optional feature. All OS compressors are suitable for speed-controlled operation. From OS.95 with IQ MODULE.

BITZER's semi-hermetic HS screw compressors feature a built-in suction gas-cooled motor integrated into the refrigerant circuit. For many years, they've proven to be a robust and efficient market solution – on their own and in parallel operation with several compressors and a shared oil separator. Because they're compatible with a variety of refrigerants and boast a wide range of capacities and applications, these compressors are the first choice for large-scale commercial and industrial applications. They're used when larger refrigerating capacities are required, for instance in blast freezers for the food industry as well as in refrigerator and freezer distribution warehouses. HS compressors are also suitable for many other refrigeration and heat pump applications.