OSK = Application for air-conditioning and medium temperature cooling

OSN = Application for low temperature cooling

Over a period of many years, BITZER’s open screw compressors have established a reputation as a robust and efficient market solution. They’re used on their own and in parallel operation with several compressors and a shared oil separator. The combination of open compressor and external standard motors makes the entire series exceptionally flexible and facilitates operation at different supply voltages. With the corresponding accessories such as couplings and coupling housing, BITZER ensures a simple and secure connection between compressor and external standard motor. Another advantage is that the refrigerant circuit and electrical drive are separate, which simplifies maintenance and repair, promoting utilisation in many special applications in particular, including in the chemistry and pharmaceutical industries, and resulting in the use of OS screw compressors on ships.

Technical Features

Optimised for parallel operation

High system output
Optimal capacity adjustment and minimal energy requirements under full- and part-load
Combination of various compressor sizes

Robust design

Large bearings
Coupling and coupling housing for direct drive with IEC motors
Specially developed NH₃ variant

OS53 .. 74

High efficiency profile
Efficient capacity control
Economiser mode

OS85

Combination of proven OS technology with the innovative features of the CSH series

Slide control for seamless or stepped capacity control

Economiser with sliding suction position
Effective even under part-load

Built-in oil management system
Automatic oil stop valve
Oil filter
Oil monitor