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Compact energy-savers
Built for performance in demanding applications, our water-cooled oil-free compressors feature innovative cooling solutions to achieve the lowest possible power consumption.

This, in combination with a Kaeser heat recovery system, allows you to significantly reduce heating costs. Contact us for help tailoring a solution to your needs.
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CSG 55-2 W Model 50 Horsepower (hp) Nominal Motor Standard Version Water-Cooled Oil-Free Air Compressor
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CSG 70-2 W Model 60 Horsepower (hp) Nominal Motor Standard Version Water-Cooled Oil-Free Air Compressor
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CSG 90-2 W Model 75 Horsepower (hp) Nominal Motor Standard Version Water-Cooled Oil-Free Air Compressor
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CSG 120-2 W Model 100 Horsepower (hp) Nominal Motor Standard Version Water-Cooled Oil-Free Air Compressor

CSG 120-2 W Model 100 Horsepower (hp) Nominal Motor Standard Version Water-Cooled Oil-Free Air Compressor
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CSG 130-2 W Model 125 Horsepower (hp) Nominal Motor Standard Version Water-Cooled Oil-Free Air Compressor
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Description N/A Compact energy-savers
Built for performance in demanding applications, our water-cooled oil-free compressors feature innovative cooling solutions to achieve the lowest possible power consumption.

This, in combination with a Kaeser heat recovery system, allows you to significantly reduce heating costs. Contact us for help tailoring a solution to your needs.
Brands N/A Kaeser Compressors
Model N/A CSG 55-2 W N/A CSG 70-2 W N/A CSG 90-2 W N/A CSG 120-2 W N/A CSG 130-2 W
Working Pressure N/A 90 psi125 psi N/A 60 psi90 psi125 psi N/A 60 psi90 psi125 psi145 psi N/A 60 psi90 psi125 psi145 psi N/A 125 psi145 psi
Complete System Flow Rate at 60 Pound Per Square Inch (psi) Working Pressure N/A N/A 350 acfm N/A 396 acfm N/A 465 acfm N/A
Complete System Flow Rate at 90 Pound Per Square Inch (psi) Working Pressure N/A 253 acfm N/A 304 acfm N/A 348 acfm N/A 464 acfm N/A
Complete System Flow Rate at 125 Pound Per Square Inch (psi) Working Pressure N/A 198 acfm N/A 251 acfm N/A 302 acfm N/A 426 acfm N/A 462 acfm
Complete System Flow Rate at 145 Pound Per Square Inch (psi) Working Pressure N/A N/A N/A 278 acfm N/A 426 acfm N/A 461 acfm
Maximum Positive Pressure at 60 Pound Per Square Inch (psi) Working Pressure N/A N/A 60 psi N/A 60 psi N/A 90 psi N/A
Maximum Positive Pressure at 90 Pound Per Square Inch (psi) Working Pressure N/A 90 psi N/A 90 psi N/A 90 psi N/A 90 psi N/A
Maximum Positive Pressure at 125 Pound Per Square Inch (psi) Working Pressure N/A 125 psi
Maximum Positive Pressure at 145 Pound Per Square Inch (psi) Working Pressure N/A N/A N/A 145 psi N/A 145 psi N/A 145 psi
Nominal Motor Output N/A 50 hp N/A 60 hp N/A 75 hp N/A 100 hp N/A 125 hp
Pressure Dew Point at 90 Pound Per Square Inch (psi) Working Pressure N/A
Pressure Dew Point at 125 Pound Per Square Inch (psi) Working Pressure N/A
Pressure Dew Point at 145 Pound Per Square Inch (psi) Working Pressure N/A
Width N/A 98 in
Depth N/A 65 in
Height N/A 77 in
Compressed Air Connection Thread Size N/A 2-1/2 in
Compressed Air Connection Thread Type N/A American National Standards Institute (ANSI) Class 150
Sound Pressure Level N/A 65 dBA N/A 65 dBA N/A 66 dBA N/A 67 dBA N/A 69 dBA
Weight N/A 5004 lb N/A 5093 lb N/A 5236 lb N/A 5545 lb N/A 5820 lb
Ambient Temperature N/A Up to +115 ºF
Additional Information N/A Their compact design and model-specific sized exhaust make them ideal for installations with low ceilings.
  • All models available with i.HOC® integrated heat of compression dryer
Advantages N/A
  • Low compressed air discharge temperature - Cupronickel (CuNi10Fe) cooling pipes with internal star lamella fins provide optimum heat transfer.
  • Lower costs thanks to heat recovery - With a Kaeser heat recovery system, up to 96% of compressor exhaust heat can be recycled - for example, to heat water to 195 ºF.
  • Maintenance-friendly - The air/water heat exchangers of the low and high pressure stages are housed in separate enclosures, each with large service doors for easy maintenance accessibility.
Low Life Cycle Costs N/A Our custom consulting services, award-winning product design, and continual investment in our research and development give you superior quality that's tailored for your needs.
Complete Unit N/A
  • Ready for operation
  • Fully automatic
  • Super-soundproofing
  • Vibration dampening
  • Service-friendly design
Airend N/A
  • Two-stage, oil-free compression rotary screw compressor with precision gearing as per AGMA Q13/DIN-Class 5
  • 2nd compression stage with stainless steel rotors and jacket cooling
  • Rotors feature durable coating
  • Integrated oil tank with oil tank ventilation via a microfilter
  • Fiber-free pulsation dampeners downstream of both compression stages
Drive Motor N/A
  • Manufactured by SIEMENS
  • Premium and Super Premium Efficiency Motor
  • Continuous motor winding temperature monitoring
  • IP 55 protection
Cooling N/A
  • Separate shell and tube heat exchangers with coated steel tube and CuNi10Fe pipes
  • Copper-soldered plate-type heat exchanger as gear oil cooler
Electrical Components N/A
  • Control cabinet to IP 54
  • Switching cabinet ventilation
  • Automatic wye-delta protection combination
  • Control transformer
Sigma Control 2 N/A
  • Plain text display
  • 30 selectable languages
  • Soft-touch keys with icons
  • Traffic-light LEDs for at-a-glance operational status
  • Fully automatic monitoring and control
  • Dual, Quadro, Vario and Continuous control included as standard
  • Interfaces: Ethernet
  • Optional communication modules for Profibus DP, Modbus, Profinet and DeviceNet
  • SD-card slot for data logging and updates
  • RFID reader
  • Web server
Hydraulic Inlet Valve N/A The hydraulic inlet valves in Kaeser's oil-free rotary screw compressors are unaffected by contamination and condensate. This makes them more reliable and easier to maintain than pneumatic valves.
Fiber-Free Pulsation Dampeners N/A Kaeser's new fiber-free pulsation dampeners keep pressure losses to an absolute minimum, help maintain consistent air quality and, unlike fiber versions, eliminate the possibility of compressed air contamination.
Reliable Oil Reservoir Venting N/A The microfilter in the oil tank venting system prevents the intake of oil-laden air. This ensures compressed air quality is maintained at all times.
Highly Efficient Condensate Separator N/A Thanks to its flow-optimized design, the newly developed condensate separator reliably separates the condensate downstream from the air coolers, and with minimal pressure loss.
Bolt-Down Machine Mounts N/A Machine mounts for bolting the unit to the floor
Heat Recovery N/A Integrated heat exchanger system including parallel shell and tube heat exchangers, heat exchanger (water/water), pump, expansion valve, and water control valves
Hot Air Connection N/A
  • Direct use of the hot compressed air, e.g. for heat regenerating desiccant dryer or as hot process air.
  • With certain models, the required hot air temperature can be controlled in ranges.
Efficient and Convenient Use of Recyclable Compressor Heat N/A With an integrated heat recovery module, recyclable compressor heat can be used for hot air space or process heating, as well as for heating of service or process water to temperatures up to 90 ºC. This makes it possible to achieve an amortization period of less than a year.
Hot Water Up to +90 Degree Celsius (ºC) N/A Recovered heat energy can be used in any number of ways. Heat recovery provides warm water up to 90 ºC as appropriate for specific applications.
Heat Recovery a Win N/A Amazingly, 100 percent of the electrical energy input to a compressor is converted into heat. Of this, up to 96 percent is available for heat recovery purposes.
Maximum Availability Despite Heat Recovery N/A During maintenance work on the water system of the heat recovery system other than the compressor, an optionally available complete internal water circuit (with pump, expansion valve, safety valve, etc.) ensures reliable compressor performance.
Reliable Heat Recovery for your Application N/A For self-protection purposes, compressors with integrated heat recovery are equipped with a secondary water system. This separation into a primary and secondary water system not only ensures reliable compressed air supply availability with optimum heat recovery performance, but also provides the flexibility of coupling or decoupling the oil and jacket cooling to / from the heat recovery system according to required heating demand.
Refrigerated Dryer N/A
Power Consumption N/A
Pressure Dew Point N/A
Refrigerant N/A
Global Warming Potential N/A
Refrigerant Volume N/A
Refrigerant Mass as CO2 Equivalent N/A
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