OS.(A)74-EX Series

OS.(A)74-EX Series

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

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