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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.

    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) ex series
OS.(A)74-EX Series

OS.(A)74-EX Series

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OS.(A)74-EX Series

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The OS.(A)74-EX open-drive screw compressor series is dedicated to operation in hazardarous atmospheres zone 1 and zone 2. It is specially designed for installations in machines located in areas that are subject to the EU Explosion Protection Directive 2014/34/EU.

Refrigerants

  • OS.A74-EX:
    • Natural low-GWP refrigerant R717 (NH₃)
  • OS.74-EX:
    • HFC, HFC blends, HCFC, non-flammable A1

Product range

  • Four models: 165 ... 250 m³/h at 2,900 rpm

Certifications

  • EU Explosion Protection Directive 2014/34/EU

Applications

  • Explosion-proof process and A/C liquid chillers

Industry sectors

  • Oil and gas industry
  • Chemical and pharmaceutical industry
  • Marine and offshore industry

Submit request
  • Features
  • Benefits
  • Accessories

Highlights

  • Explosion-proof design according to EU Directive 2014/34/EU
    • EU Explosion Protection Directive 2014/34/EU designation: Ex II 2G Ex h IIC T4 Gb X
  • Applicable in zone 1 and zone 2 (EU Explosion Protection Directive 2014/34/EU) according to EU Directive 1999/92/EC

Capacity regulation

  • Mechatronic capacity control
    • Multi-stage capacity control (control pistons)
  • Suitable for VSD operation
    • OS.(A)74-EX: Speed range 1,450 ... 4,000 rpm

Product versions

  • OSK(A): MT and A/C applications
  • OSN(A): LT and MT applications

Reduced life cycle costs

  • Very low operating costs due to outstanding high energy efficiency in full and part load
  • Long lifetime due to high robustness and low-vibration 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

  • Matching explosion-proof couplings
  • Matching coupling housings
  • Explosion-proof solenoid coils for multiple supply voltages
  • Wide range of suction and discharge bushings and discharge gas shut-off valves
  • Adaptor and shut-off valve for economiser connection

System-related accessories

  • Explosion-proof oil separators:
    • Explosion-proof oil separators for synthetic refrigerants: OA..EX series
    • Explosion-proof oil separators for NH3: OA..AEX series

  • Features

    Highlights

    • Explosion-proof design according to EU Directive 2014/34/EU
      • EU Explosion Protection Directive 2014/34/EU designation: Ex II 2G Ex h IIC T4 Gb X
    • Applicable in zone 1 and zone 2 (EU Explosion Protection Directive 2014/34/EU) according to EU Directive 1999/92/EC

    Capacity regulation

    • Mechatronic capacity control
      • Multi-stage capacity control (control pistons)
    • Suitable for VSD operation
      • OS.(A)74-EX: Speed range 1,450 ... 4,000 rpm

    Product versions

    • OSK(A): MT and A/C applications
    • OSN(A): LT and MT applications

  • Benefits

    Reduced life cycle costs

    • Very low operating costs due to outstanding high energy efficiency in full and part load
    • Long lifetime due to high robustness and low-vibration 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

    • Matching explosion-proof couplings
    • Matching coupling housings
    • Explosion-proof solenoid coils for multiple supply voltages
    • Wide range of suction and discharge bushings and discharge gas shut-off valves
    • Adaptor and shut-off valve for economiser connection

    System-related accessories

    • Explosion-proof oil separators:
      • Explosion-proof oil separators for synthetic refrigerants: OA..EX series
      • Explosion-proof oil separators for NH3: OA..AEX series

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
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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 in special explosion-proof design - OS74 SB-509-5 ( 1 MB ) Order no. 80450605 DE / EN 01.12.2021
On the notepad

*For further documentation please choose Product Type

Products

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* Displacement in m³/h at 2900/3500 rpm

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