Bitzer UK, a subsidiary of one of the largest manufacturers of refrigerant compressors for commercial and industrial applications in Europe, recently introduced two new robust ranges of screw compressors: the semi-hermetic 85 and the open 85 series for industrial refrigeration applications.

The HS 85 semi-hermetic compressor combines proven screw compressor technology with some of the innovative features found in BITZER’s established compact screw ranges – including the space saving feature of having all the connections on one side. The compressors are optimised for parallel compounding to provide higher system capacity. Slider control gives infinite or three stage stepped capacity control and unlike other similar compressors the economiser is incorporated into the capacity control slider and can be used throughout the unloading range.This design innovation provides the highest energy efficient operation with part loading. An integrated oil management system features an automatic oil stop valve, oil filter and oil monitoring making installation. The HS 85 series extends the existing HS range and provides displacements of 315 to 410 3/h at 50 Hz and can be used with R134a, R404A, R507A, R407C and R22.

The OS85 open compressor series offers the same innovative capacity control and economiser technology and displacements of 315 to 410 m3/h at 2900 min-1 and can also be used with R134a, R404A, R507A, R407C, R22, whilst the OSA85 versions accommodate requirements for ammonia. Providing similar energy efficient performance as the HS 85 series, the open series is particularly suited to applications where semi hermetic compressors are less favourable, such as locations with less than reliable electrical power supplies. According to the company’s press release, with the addition of these new ranges the Bitzer HS and OS screw compressors now offer a displacement range from 84 to 410 m3/h at 50 Hz.  

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