OS.A53-85 Series

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IQ MODULE

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

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

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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