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BITZER Screw Compressor – CSH / CSW / CSV / HS / OS Series
BITZER screw compressors provide high-capacity, energy-efficient solutions for commercial and industrial refrigeration, air-conditioning chillers, process cooling, heat pumps, cold storage and industrial refrigeration. The portfolio includes compact semi-hermetic, variable-speed, semi-hermetic and open-drive screw compressor technologies.
๐ BITZER Screw Compressor at a Glance
๐ Choose the Correct BITZER Screw Compressor Family
Compact Screw Compressor
Integrated motor and oil separator for compact chiller, process cooling and heat-pump systems.
Variable-Speed Compact Screw
Built-in frequency inverter for wide capacity modulation and high seasonal efficiency.
Semi-Hermetic Screw
High-capacity refrigeration compressor platform with external oil-management system.
Open-Drive Screw
Industrial screw compressor with external motor, including dedicated R717 ammonia versions.
โจ Key Features & Benefits
Twin-Screw Technology
High-capacity screw compression technology designed for reliable continuous operation.
High Energy Efficiency
Designed for efficient operation at full and part load across demanding cooling applications.
Capacity Control
Mechanical slider, stepped, stepless and variable-speed capacity-control options are available depending on compressor series.
Modern Refrigerants
Selected models support modern HFC, HFO, HFO-blend and natural refrigerant applications.
IQ Technology
Selected larger compressor platforms feature BITZER IQ functionality for protection, monitoring and capacity control.
Industrial Capability
Suitable platforms are available for chillers, cold storage, process cooling, industrial refrigeration and heat pumps.
๐ก Compact Screw vs Semi-Hermetic Screw vs Open-Drive Screw
The CSH / CSW and CSV platforms integrate the motor, compressor and oil-separation functions into a compact compressor package. HS compressors use a built-in motor but are intended for systems with an external oil-management arrangement. OS compressors separate the drive motor from the refrigerant circuit and are therefore especially suitable for large industrial refrigeration applications.
๐ BITZER Screw Compressor Series
๐ข CSH / CSW – Semi-Hermetic Compact Screw Compressors
The BITZER CS platform combines a screw compressor, suction-gas-cooled motor and integrated oil separator in one compact housing. It is particularly suitable for liquid chillers, process cooling and heat-pump systems.
| Series | Type | Displacement Range | Main Application | Key Characteristic |
|---|---|---|---|---|
| CSH | Compact Semi-Hermetic Screw | Up to 1120 m³/h @ 50 Hz | Air-cooled chillers, process cooling, heat pumps | Wide application range |
| CSW | Compact Semi-Hermetic Screw | Series dependent | Water-cooled chillers and lower condensing-temperature systems | Optimized chiller efficiency |
| CSH.6 | High-Efficiency Compact Screw | 258 – 1120 m³/h @ 50 Hz | High-efficiency A/C and process chillers | Improved seasonal efficiency |
| CSW105 | Large Compact Screw | 1170 – 2000 m³/h @ 50 Hz | Large water-cooled and process chillers | Large-capacity compact platform |
CSH generally provides a wider application range, while CSW versions are optimized for applications such as water-cooled chillers and systems operating at lower condensing temperatures.
๐ข CSH.6 High-Efficiency Compact Screw – Model Range
CSH.6 is designed particularly for high-efficiency air-conditioning and process chillers using modern lower-GWP refrigerants.
| Model Family | 50 Hz Displacement |
|---|---|
| CSH7673 | 258 m³/h |
| CSH7683 | 295 m³/h |
| CSH7693 | 336 m³/h |
| CSH8673 | 410 m³/h |
| CSH8683 | 470 m³/h |
| CSH8693 | 535 m³/h |
| CSH9663 | 615 m³/h |
| CSH9673 | 700 m³/h |
| CSH9683 | 805 m³/h |
| CSH9693 | 910 m³/h |
| CSH96103 | 1015 m³/h |
| CSH96113 | 1120 m³/h |
๐ข CSW105 – Large Capacity Compact Screw Compressor
CSW105 extends the BITZER compact screw compressor platform into very large-capacity chiller applications. It features an integrated oil separator, IQ functionality and stepless capacity regulation.
| Family | 50 Hz Displacement | Main Application |
|---|---|---|
| CSW10563 | 1170 m³/h | Large-capacity chiller |
| CSW10573 | 1400 m³/h | Large-capacity chiller |
| CSW10583 | 1700 m³/h | Large-capacity chiller |
| CSW10593 | 2000 m³/h | Large-capacity chiller |
CSW105 uses double-slider technology with automatic internal volume-ratio (Vแตข) adaptation and stepless capacity regulation.
๐ต CSVH / CSVW – Variable-Speed Screw Compressor
BITZER CSV combines compact screw technology with an integrated frequency inverter. The compressor automatically varies speed according to system load, providing a wide capacity modulation range and excellent seasonal efficiency.
| Series | Application | Technology |
|---|---|---|
| CSVH | Air-cooled A/C chillers, process chillers and heat pumps | Integrated frequency inverter |
| CSVW | Water-cooled A/C and process chillers, plus suitable lower-condensing applications | Integrated frequency inverter |
Current CSV Capacity Sizes
| CSVH Model | CSVW Model | Minimum / Maximum Displacement |
|---|---|---|
| CSVH24-125Y | CSVW24-125MY | 110 / 464 m³/h |
| CSVH25-160Y | CSVW25-160MY | 110 / 580 m³/h |
| CSVH26-200Y | CSVW26-200MY | 110 / 725 m³/h |
| CSVH37-240Y | CSVW37-240Y | 226 / 1000 m³/h |
| CSVH38-290Y | CSVW38-290Y | 226 / 1206 m³/h |
Variable-speed control allows the compressor output to follow the actual system load more closely than conventional on/off control, making CSV especially attractive for applications with large variations in cooling demand.
๐ฉ HS – Semi-Hermetic Screw Compressor
BITZER HS compressors are semi-hermetic screw compressors with a built-in suction-gas-cooled motor. They are designed for large commercial and industrial refrigeration, process cooling and chiller applications.
| Series | Version | Application | Capacity Control |
|---|---|---|---|
| HS.53 | HSK / HSN | MT / LT / A/C | Multistage control |
| HS.64 | HSK / HSN | MT / LT / A/C | Multistage control |
| HS.74 | HSK / HSN | MT / LT / A/C | Multistage control |
| HS.85 | HSK / HSN | MT / LT / A/C | Stepwise or stepless slider control |
| HS.95 | HSK / HSN | Large commercial / industrial systems | Stepless slider control + IQ technology |
HSK is primarily intended for air-conditioning and medium-temperature applications.
HSN is optimized for low-temperature and suitable medium-temperature refrigeration applications.
๐ข OS – Open-Drive Screw Compressor
BITZER OS compressors use an open-drive construction where the compressor is mechanically coupled to an external motor. This design is widely used in high-capacity industrial refrigeration and process cooling installations.
| Version | Application |
|---|---|
| OSK | Medium-temperature refrigeration |
| OSN | Low-temperature refrigeration |
The drive motor is separated from the refrigerant circuit. This allows the compressor and motor to be selected as part of a larger industrial refrigeration system and makes the OS platform especially suitable for demanding industrial installations.
๐ฉ OS.A – Open-Drive Ammonia Screw Compressor
BITZER OS.A screw compressors are specifically designed for industrial refrigeration systems using the natural refrigerant R717 / ammonia (NHโ).
| Series | Displacement | Refrigerant | Typical Application |
|---|---|---|---|
| OS.A53 | 84 – 535 m³/h @ 2900 rpm | R717 / NHโ | Industrial refrigeration, cold storage, blast freezing, process cooling |
| OS.A74 | |||
| OS.A85 | |||
| OS.A95 | 700 – 1015 m³/h @ 2900 rpm | R717 / NHโ | Large industrial ammonia refrigeration |
| OS.A105 | 1400 – 2000 m³/h @ 2900 rpm | R717 / NHโ | Very large industrial ammonia systems |
R717 ammonia refrigeration requires specialized system design, components, controls and safety procedures. OS.A compressors must be selected and applied according to the relevant BITZER technical documentation and applicable safety requirements.
โ๏ธ Screw Compressor Capacity Control
Capacity-control technology differs according to compressor construction size and series.
| Compressor | Typical Capacity Control |
|---|---|
| HS.53 – HS.74 | Multistage capacity control |
| HS.85 | 50 / 75 / 100% stepped or approximately 50 – 100% stepless |
| CS.65 – CS.96 | 25 / 50 / 75 / 100% stepped or approximately 25 – 100% stepless |
| HS.95 | Stepless slider capacity control |
| CS.105 | Stepless capacity control with automatic Vแตข adaptation |
| CSV | Variable-speed capacity control using integrated frequency inverter |
| OS.A95 / OS.A105 | Advanced stepless capacity control with automatic Vแตข adaptation |
๐ก๏ธ Refrigerant Compatibility
BITZER screw compressors are available for a broad range of refrigerants. Compatibility varies considerably between CSH, CSW, CSV, HS, OS and OS.A models.
Do not assume every BITZER screw compressor is suitable for every refrigerant shown above.
Refrigerant approval depends on the exact compressor model, oil, application, motor version and operating conditions. Always verify the current BITZER application limits before final selection.
๐ญ Typical Applications
โ๏ธ Cold Storage
Medium and low-temperature refrigerated warehouses.
๐ง Blast Freezing
High-capacity low-temperature freezing systems.
๐ง Water Chillers
Air-cooled and water-cooled liquid chillers.
๐ญ Process Cooling
Industrial manufacturing and process cooling.
๐ฌ๏ธ Air Conditioning
Large commercial and industrial A/C chillers.
๐ฅ Heat Pumps
Selected screw compressors for heating applications.
๐ฅ Food Processing
Dairy, food and beverage refrigeration systems.
๐งช Chemical Industry
Industrial process and temperature control.
๐ข Marine Cooling
Suitable compressor platforms for marine systems.
โ๏ธ Ammonia Plants
OS.A screw compressors for industrial R717 systems.
๐ Quick BITZER Screw Compressor Selection Guide
๐ Information Required for Compressor Selection
BITZER screw compressors should not be selected only according to compressor model, horsepower or physical size.
Always confirm the required refrigerant, cooling capacity, evaporating temperature, condensing temperature, electrical supply, oil requirement, capacity-control method and system configuration before ordering.
For replacement applications, provide the complete compressor nameplate and existing system operating conditions so the correct model and configuration can be verified.
Need a BITZER Screw Compressor?
Contact RNA Engineering & Trading Sdn Bhd with your required refrigerant, cooling capacity, evaporating temperature, condensing temperature, voltage and application. For replacement compressors, send us a clear photo of the existing compressor nameplate. Our team can assist with identifying the suitable BITZER CSH, CSW, CSV, HS or OS screw compressor for your refrigeration or cooling system.
Technical data, refrigerant approvals, application limits, capacity control and model availability vary according to compressor series and configuration. Final selection should always be verified using current BITZER technical documentation and selection data.
Inquiry - Bitzer Screw Compressor CSH / CSW / HS / OS Series
