Mid-sized rotary screw compressors from 25 to 125 hp

For us, a compressed air supply using rotary screw compressors represents the centerpiece of your production process. Our ASD, BSD, and CSD series ensure a dependable compressed air supply for your processes with unprecedented levels of efficiency.

These systems are perfect team players that can be integrated into existing control systems via the SIGMA AIR MANAGER 4.0. To ensure that you achieve the exact compressed air supply you require, our rotary screw compressors are available in different variants:

Base model
with refrigeration dryer for high compressed air quality: T model
with variable-speed drive for optimum efficiency and a broad control range: SFC model
with synchronous reluctance motor: Significantly greater efficiency – especially in the partial load range – than comparable asynchronous systems enables considerable energy savings.
Complete systems with integrated refrigerated dryer and variable-speed drive: T SFC models

Our experts will be glad to assist you in selecting the right model for your needs.

Your benefits

Energy savings:
Fixed-speed systems with asynchronous motors which meet the IE4 efficiency class. Frequency-controlled rotary screw compressors are equipped with IE5 motors and meet the IES2 system efficiency class.
Longer service life:
Electronic Thermo Management dynamically controls the fluid temperature on compressors from the ASD, BSD, and CSD series. This not only saves additional energy, but also reliably prevents condensate formation and the associated moisture damage.
Heat recovery:
Our rotary screw compressors convert 100% of the electrical drive energy supplied to them into heat energy. 96% of this energy remains available for heat recovery. Use this potential to your advantage!

CSD – Power converted into efficiency

The new generation of oil-injected rotary screw compressors from Kaeser’s CSD series now delivers performance with even greater precision and efficiency. The integrated package consisting of motor, timing gears and airend permits the most energy-efficient airend speed to be selected for each operating point. The installed Electronic Thermal Management (ETM) and newly-designed inlet valve, together with the larger inlet filter, significantly enhance rotary screw compressor efficiency. The speed-controlled fan ensures further energy savings and a reduced CO2 footprint, since it only delivers as much cooling air as is actually required.

Six pressure variants significantly increase flow rate and, most importantly, enable precision adjustment to your individual pressure requirements.

Oil-free Air Compressors

Reliable performance—even under extreme conditions

Kaeser's air-cooled oil-free rotary screw air compressors deliver exceptional compressed air supply reliability – even in ambient temperatures as high as 115 °F.

Thanks to an innovative system design, air-cooled models are available all the way up to 450 hp.

Flow rates from 116 to 1790 cfm
Robust stainless steel-aluminum cooler combination
SFC models: available with Sigma Frequency Control, variable speed control (VSD) for superior part load performance
CSG-2 series available with an integrated refrigerated dryer (T models)
All models available with i.HOC® integrated heat of compression dryer

Your advantages

Heat-recovery made easy:
Thanks to radial fans with high residual thrust, the heated exhaust air can easily be ducted away and used for heating an adjacent room without additional auxiliary fans.
Energy-efficient features:
In standby mode, the temperature-controlled Kaeser standstill fan reliably dissipates residual heat. This allows the main fan to turn off and cools the package down for quicker service.
Exceptionally maintenance-friendly:
Swing-out coolers make cleaning easy.

Water-cooled oil-free air compressors

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.

Their compact design and model-specific sized exhaust make them ideal for installations with low ceilings.

Flow rates from 116 to 1790 cfm
SFC models: available with Sigma Frequency Control, variable speed control (VSD) for superior part load performance
CSG-2 series available with an integrated refrigerated dryer (T models)
All models available with i.HOC® integrated heat of compression dryer

Your advantages

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 °F.
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.

Oil-free air compressors with integrated dryers

i.HOC® – Ultra efficient compressed air drying

The patented i.HOC® rotary drum dryer from KAESER uses up to 100 % of the compressor's heat. Thanks to full-flow regeneration, it delivers reliable pressure dew points up to an ambient temperature of 115 °F – without electrical heating or additional cooling of the regeneration air.

Available for air-cooled or water-cooled units
Unit rated power from 50 hp to 450 hp
Unit flow rates from 117 cfm to 1789 cfm
Integrated SIGMA CONTROL 2 compressor controller

Your advantages

Sub-zero pressure dew points even in high ambient temperatures:
i.HOC® delivers below-zero pressure dew points even with high cooling medium temperatures.
Pressure dew point stability even with variable flow rates:
The pressure dew point remains stable even with low compressor load – no partial-load compensation required.
Effective drying and heat recovery:
i.HOC® uses the heat exchangers of the second compression stage, which have been optimized for heat recovery, as regeneration air coolers.

For more information about our products, please contact one of our specialized advisors.

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