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    ePARTS makes finding the appropriate spare parts for our products fast and easy. The parts are listed according to the model range and appear as a simple zoomable expanded-view drawing. The software is free of charge. As a direct BITZER customer registered at myBITZER, you benefit from additional advanced features – for example, the ability to view online prices of individual spare parts.

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Products Screw Compressors OS.A series
OS.A53-85 Series

OS.A53-85 Series

On the notepad
C_MP_CMRC01_1632005_01P_G_4C_S_N_0

IQ MODULE

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OS.A53-85 Series

On the notepad

The OS.A series is the open-drive screw compressor series for use in industrial ammonia applications. The series combines a high refrigerating capacity with proven reliability and outstanding energy efficiency in full and part load.

Refrigerants

  • Natural low-GWP refrigerant
    • R717 (NH₃)

Product range

  • Three families: OS.A53, OS.A74 and OS.A85
  • 11 sizes: 84 ... 535 m³/h at 2,900 rpm

Certifications

  • CE
  • EAC
  • DNV

Applications

  • Refrigerated MT and LT storage
  • Blast chilling/freezing systems
  • Process and A/C liquid chillers
  • Ice production
  • Ice rinks

Industry sectors

  • Food and beverages industry
  • Chemical and pharmaceutical industry
  • Leisure and sports industry
  • Marine and offshore industry

Submit request
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  • Features
  • Benefits
  • Accessories

Highlights

  • Industry-leading efficiency in full and part load operation
  • Easy parallel compounding for increased system capacity

Capacity regulation

  • Mechatronic capacity control
    • Easy control via flanged solenoid valves
    • OS.A53 to OS.A74: Multistage capacity control (control pistons)
    • OS.A85: Dual capacity control (single slider) for stepwise or alternatively stepless capacity control and Vᵢ adaption
  • Suitable for VSD operation
    • OS.A53: Speed range 1,450 ... 4,500 rpm
    • OS.A74 and OS.A85: Speed range 1,450 ... 4,000 rpm

Product versions

  • OSKA: MT and A/C applications
  • OSNA: LT and MT applications
  • OSHA: Higher condensing temperatures (heat pumps)
  • OSKAB: LT stage in booster systems

Reduced life cycle costs

  • Very low operating costs due to outstanding high energy efficiency
  • Long lifetime due to high robustness and low-vibration design
  • Low maintenance costs due to service-friendly design
  • BITZER Global Service network for quick spare part availability all over the world

Easy to apply

  • Extensive documentation and BITZER know-how for technical support
  • Wide range of matching accessories
    • Easy calculation and selection via BITZER SOFTWARE

Reliability and flexibility

  • All compressors are 100% factory-tested
  • Integrated mechanical capacity regulation (CR) and start unloading (SU)
  • Suitable for wide-range VSD operation
  • Easy parallel operation of compressors due to internal discharge check valve

Compressor-related accessories

  • Wide range of suction and discharge bushings and discharge gas shut-off valves
  • Matching couplings and coupling housings
  • Adaptor and shut-off valve for economiser connection
  • OS.A85: IQ MODULE for simplified compressor control and monitoring

System-related accessories

  • Primary and secondary oil separators
    • Oil separators for NH₃: OA..A series
    • Combined oil separators for NH₃: OAC series; OAHC series
    • Secondary oil separators for NH₃: OAS series
  • Oil coolers
    • Water cooled oil coolers for NH₃: OW..A series
  • Liquid receivers:
    • Horizontal Liquid receivers for NH₃: F..A series

  • Features

    Highlights

    • Industry-leading efficiency in full and part load operation
    • Easy parallel compounding for increased system capacity

    Capacity regulation

    • Mechatronic capacity control
      • Easy control via flanged solenoid valves
      • OS.A53 to OS.A74: Multistage capacity control (control pistons)
      • OS.A85: Dual capacity control (single slider) for stepwise or alternatively stepless capacity control and Vᵢ adaption
    • Suitable for VSD operation
      • OS.A53: Speed range 1,450 ... 4,500 rpm
      • OS.A74 and OS.A85: Speed range 1,450 ... 4,000 rpm

    Product versions

    • OSKA: MT and A/C applications
    • OSNA: LT and MT applications
    • OSHA: Higher condensing temperatures (heat pumps)
    • OSKAB: LT stage in booster systems

  • Benefits

    Reduced life cycle costs

    • Very low operating costs due to outstanding high energy efficiency
    • Long lifetime due to high robustness and low-vibration design
    • Low maintenance costs due to service-friendly design
    • BITZER Global Service network for quick spare part availability all over the world

    Easy to apply

    • Extensive documentation and BITZER know-how for technical support
    • Wide range of matching accessories
      • Easy calculation and selection via BITZER SOFTWARE

    Reliability and flexibility

    • All compressors are 100% factory-tested
    • Integrated mechanical capacity regulation (CR) and start unloading (SU)
    • Suitable for wide-range VSD operation
    • Easy parallel operation of compressors due to internal discharge check valve

  • Accessories

    Compressor-related accessories

    • Wide range of suction and discharge bushings and discharge gas shut-off valves
    • Matching couplings and coupling housings
    • Adaptor and shut-off valve for economiser connection
    • OS.A85: IQ MODULE for simplified compressor control and monitoring

    System-related accessories

    • Primary and secondary oil separators
      • Oil separators for NH₃: OA..A series
      • Combined oil separators for NH₃: OAC series; OAHC series
      • Secondary oil separators for NH₃: OAS series
    • Oil coolers
      • Water cooled oil coolers for NH₃: OW..A series
    • Liquid receivers:
      • Horizontal Liquid receivers for NH₃: F..A series

Documentation

Open drive screw compressors - OS.53 .. OS.105 SP-500-5 EN   ( 10 MB )

Brochures*

SP-500-5-DE ( 10 MB ) Order no. 80161301 DE 01.09.2022
On the notepad
Open Drive Screw Compressors - OS.53 .. OS.105 SP-500-5-EN ( 10 MB ) Order no. 80161401 EN 01.09.2022
On the notepad

Operating instructions*

Open Drive Screw Compressors SB-500-2 ( 595 KB ) Order no. 80450101 DE / EN / FR 01.11.2012
On the notepad
Open Drive Screw Compressors - OS85 Series SB-510-3 ( 2 MB ) Order no. 80450301 DE / EN / FR 01.03.2012
On the notepad

*For further documentation please choose Product Type

Products

OSNA5341-K  84 / 101 *

Technical Data $- get to top level node -$ TO DOCUMENTATION

OSKA5341-K  84 / 101 *

Technical Data OPEN IN SOFTWARE $- get to top level node -$ TO DOCUMENTATION

OSNA5351-K  100 / 121 *

Technical Data OPEN IN SOFTWARE $- get to top level node -$ TO DOCUMENTATION

OSKA5351-K  100 / 121 *

Technical Data OPEN IN SOFTWARE $- get to top level node -$ TO DOCUMENTATION

OSNA5361-K  118 / 142 *

Technical Data OPEN IN SOFTWARE $- get to top level node -$ TO DOCUMENTATION

OSKA5361-K  118 / 142 *

Technical Data OPEN IN SOFTWARE $- get to top level node -$ TO DOCUMENTATION

OSHA7452-K  192 / 232 *

Technical Data OPEN IN SOFTWARE $- get to top level node -$ TO DOCUMENTATION

OSKA7452-K  192 / 232 *

Technical Data OPEN IN SOFTWARE $- get to top level node -$ TO DOCUMENTATION

OSNA7452-K  192 / 232 *

Technical Data OPEN IN SOFTWARE $- get to top level node -$ TO DOCUMENTATION

OSHA7462-K  220 / 266 *

Technical Data OPEN IN SOFTWARE $- get to top level node -$ TO DOCUMENTATION

OSKA7462-K  220 / 266 *

Technical Data OPEN IN SOFTWARE $- get to top level node -$ TO DOCUMENTATION

OSNA7462-K  220 / 266 *

Technical Data OPEN IN SOFTWARE $- get to top level node -$ TO DOCUMENTATION

OSHA7472-K  250 / 302 *

Technical Data OPEN IN SOFTWARE $- get to top level node -$ TO DOCUMENTATION

OSKA7472-K  250 / 302 *

Technical Data OPEN IN SOFTWARE $- get to top level node -$ TO DOCUMENTATION

OSNA7472-K  250 / 302 *

Technical Data OPEN IN SOFTWARE $- get to top level node -$ TO DOCUMENTATION

OSKA8551-K  315 / 380 *

Technical Data OPEN IN SOFTWARE $- get to top level node -$ TO DOCUMENTATION

OSKA8561-K  359 / 433 *

Technical Data OPEN IN SOFTWARE $- get to top level node -$ TO DOCUMENTATION

OSNA8571-K  410 / 495 *

Technical Data OPEN IN SOFTWARE $- get to top level node -$ TO DOCUMENTATION

OSKA8571-K  410 / 495 *

Technical Data OPEN IN SOFTWARE $- get to top level node -$ TO DOCUMENTATION

OSKA8581-K  470 / 567 *

Technical Data OPEN IN SOFTWARE $- get to top level node -$ TO DOCUMENTATION

OSNA8591-K  535 / 646 *

Technical Data OPEN IN SOFTWARE $- get to top level node -$ TO DOCUMENTATION

OSKA8591-K  535 / 646 *

Technical Data OPEN IN SOFTWARE $- get to top level node -$ TO DOCUMENTATION

OSKAB5341-K  84 / 101 *

Technical Data $- get to top level node -$ TO DOCUMENTATION

OSKAB5351-K  100 / 121 *

Technical Data $- get to top level node -$ TO DOCUMENTATION

OSKAB5361-K  118 / 142 *

Technical Data $- get to top level node -$ TO DOCUMENTATION

OSKAB7452-K  192 / 232 *

Technical Data $- get to top level node -$ TO DOCUMENTATION

OSKAB7462-K  220 / 266 *

Technical Data $- get to top level node -$ TO DOCUMENTATION

OSKAB7472-K  250 / 302 *

Technical Data $- get to top level node -$ TO DOCUMENTATION

OSKAB8551-K  315 / 380 *

Technical Data $- get to top level node -$ TO DOCUMENTATION

OSKAB8561-K  359 / 433 *

Technical Data $- get to top level node -$ TO DOCUMENTATION

OSKAB8571-K  410 / 495 *

Technical Data $- get to top level node -$ TO DOCUMENTATION

OSKAB8581-K  470 / 567 *

Technical Data $- get to top level node -$ TO DOCUMENTATION

OSKAB8591-K  535 / 646 *

Technical Data $- get to top level node -$ TO DOCUMENTATION

* Displacement in m³/h at 2900/3500 rpm

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