125 - 450 hp oil-free rotary screw compressors


Dependable performance – up to +115°F ambient temperature

With logical component layout and exceptional attention to detail, Kaeser's 2-stage oil-free air compressor were designed specifically with the user in mind. Kaeser's renowned quality offers peace of and built for a lifetime reliability, even in ambient temperatures up to +115°F. 

  • Flow rate from 512 to 1794 cfm
  • Pressure from 60 to 145 psi
  • Models also available with frequency control drives (SFC)
  • Water-cooled models also available
  • i.HOC dryers available on all DSG and FSG models

Your benefits

  • Heat-use made simple:
    Thanks to radial fans with high residual thrust, the heated cooling air can normally be used straight away for space heating without need of auxiliary fans.
  • Energy-efficient in every detail:
    In standby mode, the temperature-controlled Kaeser standstill fan reliably conveys residual heat away – meaning the main fan can be switched off!
  • Exceptionally maintenance-friendly:
    The first and second stages of the aluminum-block heat exchanger can simply be swiveled out for cleaning purposes.
 

DSG-FSG oil-free rotary screw compressors in detail

Equipment

Complete unit

  • Ready for operation
  • Fully automatic
  • Super-soundproofing
  • Vibration-dampened
  • Service-friendly design
  • For ambient temperatures up to 115 °F

Airend

  • Two-stage, oil-free compression rotary screw compressor with precision gearing as per AGMA Q13/DIN- 5
  • 2nd compression stage uses stainless steel rotors and jacket cooling
  • Rotors feature durable coating
  • Integrated oil tank with oil tank ventilation
  • Fiber-free pulsation dampeners downstream of both compression stages

Drive motor

Super premium efficiency drive motor IE4 logo
  • Manufactured by SIEMENS
  • Premium and Super Premium Efficiency Motor
  • Continuous motor winding temperature monitoring
  • Enclosure protection: IP 55

Cooling

  • Generously sized compressed air aftercooler with stainless steel precooler and aluminum cooler
  • Reliable compressor performance up to 115 °F
  • Aluminum cooler for gear oil

Electrical components

  • Control cabinet to IP 54
  • Switching cabinet ventilation
  • Automatic wye-delta protection combination
  • Control transformer

SIGMA CONTROL 2

SIGMA CONTROL 2 compressor controller
  • 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
Quality in detail

Fiber-free pulse dampers

Fiber-free pulsation dampers

Kaeser's new fiber-free pulse dampers keep pressure losses to an absolute minimum, help maintain consistent air quality and, unlike fiber versions, do not present a source of contamination for the compressed air.

Highly efficient condensate separator

High-efficiency condensate separator

Thanks to its flow-optimized design, the newly developed condensate separator reliably separates the condensate downstream from the air coolers, with minimal pressure loss.

Options

Bolt-down machine mounts

  • Machine mounts for bolting the unit to the floor

Silencer for air inlet opening

  • Dampening louvers in front of heat exchangers

Cooling air filter mats

  • Cooling air filter mats in the inlet area of the compressor
  • Reduce build-up on heat exchanger surfaces and inlet air filters

Hot air connection

  • Direct use of the hot compressed air, e.g. for heat regenerating desiccant dryer or as hot process air
  • With certain models, the desired hot air temperature can be controlled in ranges.
Integrated i.HOC® drum dryer

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

  • Installed in air-cooled or water-cooled units
  • Unit rated power from 50 to 450 hp
  • Unit flow rates from 107 to 1790 cfm
  • Integrated SIGMA CONTROL 2 compressor controller
  • Also available with variable speed control and frequency converter (SFC models)
Your advantages

  • Sub-zero pressure dew points even in high ambient temperatures:
    Thanks to its extraordinary regeneration potential, the 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.

Benefits of full-flow generation

i.HOC with KAESER full-flow regeneration
□ Full-flow regeneration □ Partial-flow regeneration
↓ Regeneration area: Hot air removes moisture from the desiccant.
↑ Drying area: Moisture is drawn into the desiccant from the cold air.

The i.HOC® (Integrated Heat of Compression Dryer) system uses 100 % of the heat of compression from the second compression stage for drying purposes (full-flow regeneration). This heat is produced and available for use at zero cost.

  • No additional energy input for the drying process
  • Higher regeneration potential than with partial-flow regeneration dryers
  • Full performance, even with low compressor load

The advantages of full-flow regeneration are clear—especially with increased coolant temperatures. Kaeser drum dryers achieve outstanding drying results even without additional heating of the regeneration air.

Technical specifications DSG-2 A

Standard version

ModelDSG 140-2 A DSG 180-2 A DSG 220-2 A
Working pressure psi 90 125 145 60 90 125 145 60 90 125 145
Flow rate complete system at working pressure acfm 579 576 512 821 692 689 576 910 819 780 689
Max. positive pressure psi 125 145 60 125 145 60 90 125 145
Nominal motor output hp 125 150 175
Dimensions
W x D x H in 		135 x 69 x 94 135 x 69 x 94 135 x 69 x 94
Compressed air connection3 ANSI class 150 3 ANSI class 150 3 ANSI class 150
Sound pressure level dB(A) 80 81 81
Weight lb 7,496 7,826 8,047

ModelDSG 260-2 A DSG 290-2 A
Working pressure psi 60 90 125 145 90 125 145
Flow rate complete system at working pressure acfm 966 964 908 816 963 961
Max. positive pressure psi 90 125 145 125 145
Nominal motor output hp 200 250
Dimensions
W x D x H in 		135 x 69 x 94 135 x 69 x 94
Compressed air connection3 ANSI class 150 3 ANSI class 150
Sound pressure level dB(A) 82 84
Weight lb 8,378 8,818

SFC version

ModelDSG 180-2 SFC A DSG 220-2 SFC A DSG 260-2 SFC A
Working pressure psi 60 90 125 145 60 90 125 145 60 90 125 145
Flow rate complete system at working pressure acfm 305 - 795 332 - 761 312 - 665 337 - 615 274 - 823 295 - 821 320 - 773 378 - 737 305 - 967 330 - 966 347 - 911 364 - 858
Max. positive pressure psi 100 145 125 145 110 145
Nominal motor output hp 150 175 200
Dimensions
W x D x H in 		135 x 69 x 94 135 x 69 x 94 135 x 69 x 94
Compressed air connection3 ANSI class 150 3 ANSI class 150 3 ANSI class 150
Sound pressure level dB(A) 81 81 82
Weight lb 9,149 9,370 9,700

ModelDSG 290-2 SFC A
Working pressure psi 60 90 125 145
Flow rate complete system at working pressure acfm 323 - 1,061 367 - 1,060 418 - 1,058 447 - 1,057
Max. positive pressure psi 145
Nominal motor output hp 250
Dimensions
W x D x H in 		135 x 69 x 94
Compressed air connection3 ANSI class 150
Sound pressure level dB(A) 84
Weight lb 10,141

RD version

ModelDSG 140-2 i.HOC A DSG 180-2 i.HOC A DSG 220-2 i.HOC A
Working pressure psi 90 125 145 90 125 145 90 125 145
Flow rate complete system at working pressure acfm 579 576 512 692 689 576 819 780 689
Max. positive pressure psi 125 145 125 145 90 125 145
Nominal motor output hp 125 150 175
Pressure dew point °F -18 -30 -33 -17 -29 -32 -16 -28 -31
Dimensions
W x D x H in 		168 x 69 x 94 168 x 69 x 94 168 x 69 x 94
Compressed air connection3 ANSI class 150 3 ANSI class 150 3 ANSI class 150
Sound pressure level dB(A) 80 81 81
Weight lb 9,921 10,251 10,472

ModelDSG 260-2 i.HOC A DSG 290-2 i.HOC A
Working pressure psi 90 125 145 90 125 145
Flow rate complete system at working pressure acfm 964 908 816 963 961
Max. positive pressure psi 90 125 145 125 145
Nominal motor output hp 200 250
Pressure dew point °F -14 -26 -29 -14 -26 -28
Dimensions
W x D x H in 		168 x 69 x 94 168 x 69 x 94
Compressed air connection3 ANSI class 150 3 ANSI class 150
Sound pressure level dB(A) 82 84
Weight lb 10,803 11,244

RD SFC version

ModelDSG 180-2 i.HOC SFC A DSG 220-2 i.HOC SFC A DSG 260-2 i.HOC SFC A
Working pressure psi 90 125 145 90 125 145 90 125 145
Flow rate complete system at working pressure acfm 332 - 761 312 - 665 337 - 615 295 - 821 320 - 773 378 - 737 330 - 966 347 - 911 364 - 858
Max. positive pressure psi 100 145 125 145 110 145
Nominal motor output hp 150 175 200
Pressure dew point °F -17 -29 -32 -16 -28 -30 -14 -26 -29
Dimensions
W x D x H in 		168 x 69 x 94 168 x 69 x 94 168 x 69 x 94
Compressed air connection3 ANSI class 150 3 ANSI class 150 3 ANSI class 150
Sound pressure level dB(A) 81 81 82
Weight lb 11,574 11,795 12,125

ModelDSG 290-2 i.HOC SFC A
Working pressure psi 90 125 145
Flow rate complete system at working pressure acfm 367 - 1,060 418 - 1,058 447 - 1,057
Max. positive pressure psi 145
Nominal motor output hp 250
Pressure dew point °F -12 -24 -26
Dimensions
W x D x H in 		168 x 69 x 94
Compressed air connection3 ANSI class 150
Sound pressure level dB(A) 84
Weight lb 12,566

Technical specifications DSG-2 W

Standard version

ModelDSG 140-2 W DSG 180-2 W DSG 220-2 W
Working pressure psi 90 125 145 60 90 125 145 60 90 125 145
Flow rate complete system at working pressure acfm 579 576 512 821 692 689 576 910 819 780 689
Max. positive pressure psi 125 145 60 125 145 60 90 125 145
Nominal motor output hp 125 150 175
Dimensions
W x D x H in 		135 x 69 x 81 135 x 69 x 81 135 x 69 x 81
Compressed air connection3 ANSI class 150 3 ANSI class 150 3 ANSI class 150
Sound pressure level dB(A) 69 70 71
Weight lb 6,834 7,165 7,385

ModelDSG 260-2 W DSG 290-2 W
Working pressure psi 60 90 125 145 90 125 145
Flow rate complete system at working pressure acfm 966 964 908 816 963 961
Max. positive pressure psi 90 125 145 125 145
Nominal motor output hp 200 250
Dimensions
W x D x H in 		135 x 69 x 81 135 x 69 x 81
Compressed air connection3 ANSI class 150 3 ANSI class 150
Sound pressure level dB(A) 74 75
Weight lb 7,716 8,157

SFC version

ModelDSG 180-2 SFC W DSG 220-2 SFC W DSG 260-2 SFC W
Working pressure psi 60 90 125 145 60 90 125 145 60 90 125 145
Flow rate complete system at working pressure acfm 305 - 795 332 - 761 312 - 665 337 - 615 274 - 823 295 - 821 320 - 773 378 - 737 305 - 967 330 - 966 347 - 911 364 - 858
Max. positive pressure psi 100 145 125 145 110 145
Nominal motor output hp 150 175 200
Dimensions
W x D x H in 		135 x 69 x 81 135 x 69 x 81 135 x 69 x 81
Compressed air connection3 ANSI class 150 3 ANSI class 150 3 ANSI class 150
Sound pressure level dB(A) 71 72 75
Weight lb 8,488 8,708 9,039

ModelDSG 290-2 SFC W
Working pressure psi 60 90 125 145
Flow rate complete system at working pressure acfm 323 - 1,061 367 - 1,060 418 - 1,058 447 - 1,057
Max. positive pressure psi 145
Nominal motor output hp 250
Dimensions
W x D x H in 		135 x 69 x 81
Compressed air connection3 ANSI class 150
Sound pressure level dB(A) 76
Weight lb 9,480

RD version

ModelDSG 140-2 i.HOC W DSG 180-2 i.HOC W DSG 220-2 i.HOC W
Working pressure psi 90 125 145 90 125 145 90 125 145
Flow rate complete system at working pressure acfm 579 576 512 692 689 576 819 780 689
Max. positive pressure psi 125 145 125 145 90 125 145
Nominal motor output hp 125 150 175
Pressure dew point °F -13 -30 -33 -14 -30 -33 -14 -30 -33
Dimensions
W x D x H in 		168 x 69 x 81 168 x 69 x 81 168 x 69 x 81
Compressed air connection3 ANSI class 150 3 ANSI class 150 3 ANSI class 150
Sound pressure level dB(A) 69 70 71
Weight lb 9,259 9,590 9,811

ModelDSG 260-2 i.HOC W DSG 290-2 i.HOC W
Working pressure psi 90 125 145 90 125 145
Flow rate complete system at working pressure acfm 964 908 816 963 961
Max. positive pressure psi 90 125 145 125 145
Nominal motor output hp 200 250
Pressure dew point °F -14 -29 -33 -15 -29 -32
Dimensions
W x D x H in 		168 x 69 x 81 168 x 69 x 81
Compressed air connection3 ANSI class 150 3 ANSI class 150
Sound pressure level dB(A) 74 75
Weight lb 10,141 10,582

RD SFC version

ModelDSG 180-2 i.HOC SFC W DSG 220-2 i.HOC SFC W DSG 260-2 i.HOC SFC W
Working pressure psi 90 125 145 90 125 145 90 125 145
Flow rate complete system at working pressure acfm 332 - 761 312 - 665 337 - 615 295 - 821 320 - 773 378 - 737 330 - 966 347 - 911 364 - 858
Max. positive pressure psi 100 145 125 145 110 145
Nominal motor output hp 150 175 200
Pressure dew point °F -14 -29 -33 -15 -30 -33 -15 -29 -33
Dimensions
W x D x H in 		168 x 69 x 81 168 x 69 x 81 168 x 69 x 81
Compressed air connection3 ANSI class 150 3 ANSI class 150 3 ANSI class 150
Sound pressure level dB(A) 71 72 75
Weight lb 10,913 11,133 11,464

ModelDSG 290-2 i.HOC SFC W
Working pressure psi 90 125 145
Flow rate complete system at working pressure acfm 367 - 1,060 418 - 1,058 447 - 1,057
Max. positive pressure psi 145
Nominal motor output hp 250
Pressure dew point °F -14 -29 -32
Dimensions
W x D x H in 		168 x 69 x 81
Compressed air connection3 ANSI class 150
Sound pressure level dB(A) 76
Weight lb 11,905

Technical specifications FSG-2 A

Standard version

ModelFSG 300-2 A FSG 350-2 A FSG 420-2 A
Working pressure psi 60 90 125 145 60 90 125 145 60 90 125 145
Flow rate complete system at working pressure acfm 1,269 1,144 1,006 795 1,391 1,388 1,261 1,148 1,747 1,589 1,501 1,261
Max. positive pressure psi 60 90 125 145 90 125 145 60 90 125 145
Nominal motor output hp 250 300 350
Dimensions
W x D x H in 		152 x 82 x 108 152 x 82 x 108 152 x 82 x 108
Compressed air connection6 ANSI class 150 6 ANSI class 150 6 ANSI class 150
Sound pressure level dB(A) 82 82 83
Weight lb 12,236 12,677 13,118

ModelFSG 500-2 A
Working pressure psi 90 125 145
Flow rate complete system at working pressure acfm 1,772 1,769 1,586
Max. positive pressure psi 125 145
Nominal motor output hp 450
Dimensions
W x D x H in 		152 x 82 x 108
Compressed air connection6 ANSI class 150
Sound pressure level dB(A) 83
Weight lb 13,779

SFC version

ModelFSG 420-2 SFC A FSG 500-2 SFC A
Working pressure psi 60 90 125 145 60 90 125 145
Flow rate complete system at working pressure acfm 550 - 1,722 598 - 1,517 608 - 1,422 653 - 1,334 550 - 1,793 604 - 1,790 666 - 1,702 702 - 1,612
Max. positive pressure psi 90 145 145
Nominal motor output hp 350 450
Dimensions
W x D x H in 		152 x 82 x 108 152 x 82 x 108
Compressed air connection6 ANSI class 150 6 ANSI class 150
Sound pressure level dB(A) 83 84
Weight lb 14,440 15,432

RD version

ModelFSG 300-2 i.HOC A FSG 350-2 i.HOC A FSG 420-2 i.HOC A
Working pressure psi 90 125 145 125 145 90 125 145
Flow rate complete system at working pressure acfm 1,144 1,006 795 1,261 1,148 1,589 1,501 1,261
Max. positive pressure psi 90 125 145 125 145 90 125 145
Nominal motor output hp 250 300 350
Pressure dew point °F -8 -26 -31 -23 -27 -4 -20 -26
Dimensions
W x D x H in 		182 x 82 x 108 182 x 82 x 108 182 x 82 x 108
Compressed air connection6 ANSI class 150 6 ANSI class 150 6 ANSI class 150
Sound pressure level dB(A) 82 82 83
Weight lb 14,881 15,322 15,763

ModelFSG 500-2 i.HOC A
Working pressure psi 145
Flow rate complete system at working pressure acfm 1,586
Max. positive pressure psi 145
Nominal motor output hp 450
Pressure dew point °F -22
Dimensions
W x D x H in 		182 x 82 x 108
Compressed air connection6 ANSI class 150
Sound pressure level dB(A) 83
Weight lb 16,424

RD SFC version

ModelFSG 420-2 i.HOC SFC A FSG 500-2 i.HOC SFC A
Working pressure psi 90 125 145 90 125 145
Flow rate complete system at working pressure acfm 598 - 1,517 608 - 1,422 653 - 1,334 604 - 1,790 666 - 1,702 702 - 1,612
Max. positive pressure psi 90 145 145
Nominal motor output hp 350 450
Pressure dew point °F -4 -20 -25 -5 -17 -21
Dimensions
W x D x H in 		182 x 82 x 108 182 x 82 x 108
Compressed air connection6 ANSI class 150 6 ANSI class 150
Sound pressure level dB(A) 83 84
Weight lb 17,086 18,078

Technical specifications FSG-2 W

Standard version

ModelFSG 300-2 W FSG 350-2 W FSG 420-2 W
Working pressure psi 60 90 125 145 60 90 125 145 60 90 125 145
Flow rate complete system at working pressure acfm 1,269 1,144 1,006 795 1,391 1,388 1,261 1,148 1,747 1,589 1,501 1,261
Max. positive pressure psi 60 90 125 145 90 125 145 60 90 125 145
Nominal motor output hp 250 300 350
Dimensions
W x D x H in 		144 x 82 x 87 144 x 82 x 87 144 x 82 x 87
Compressed air connection6 ANSI class 150 6 ANSI class 150 6 ANSI class 150
Sound pressure level dB(A) 74 75 76
Weight lb 11,574 12,015 12,456

ModelFSG 500-2 W FSG 501-2 W
Working pressure psi 90 125 145 145
Flow rate complete system at working pressure acfm 1,772 1,769 1,586 1,766
Max. positive pressure psi 125 145 145
Nominal motor output hp 450 450
Dimensions
W x D x H in 		144 x 82 x 87 144 x 82 x 87
Compressed air connection6 ANSI class 150 6 ANSI class 150
Sound pressure level dB(A) 76 77
Weight lb 13,118 13,118

SFC version

ModelFSG 420-2 SFC W FSG 500-2 SFC W
Working pressure psi 60 90 125 145 60 90 125 145
Flow rate complete system at working pressure acfm 550 - 1,786 566 - 1,608 608 - 1,499 653 - 1,400 550 - 1,793 604 - 1,790 666 - 1,788 702 - 1,700
Max. positive pressure psi 90 145 145
Nominal motor output hp 350 450
Dimensions
W x D x H in 		144 x 82 x 87 144 x 82 x 87
Compressed air connection6 ANSI class 150 6 ANSI class 150
Sound pressure level dB(A) 77 77
Weight lb 13,779 14,771

RD version

ModelFSG 300-2 i.HOC W FSG 350-2 i.HOC W FSG 420-2 i.HOC W
Working pressure psi 90 125 145 125 145 90 125 145
Flow rate complete system at working pressure acfm 1,144 1,006 795 1,261 1,148 1,589 1,501 1,261
Max. positive pressure psi 90 125 145 125 145 90 125 145
Nominal motor output hp 250 300 350
Pressure dew point °F -8 -26 -30 -26 -30 -10 -26 -30
Dimensions
W x D x H in 		176 x 82 x 87 176 x 82 x 87 176 x 82 x 87
Compressed air connection6 ANSI class 150 6 ANSI class 150 6 ANSI class 150
Sound pressure level dB(A) 74 75 76
Weight lb 14,110 14,551 14,991

ModelFSG 500-2 i.HOC W FSG 501-2 i.HOC W
Working pressure psi 90 125 145 145
Flow rate complete system at working pressure acfm 1,772 1,769 1,586 1,766
Max. positive pressure psi 125 145 145
Nominal motor output hp 450 450
Pressure dew point °F -10 -26 -30 -30
Dimensions
W x D x H in 		176 x 82 x 87 176 x 82 x 87
Compressed air connection6 ANSI class 150 6 ANSI class 150
Sound pressure level dB(A) 76 77
Weight lb 15,653 15,653

RD SFC version

ModelFSG 420-2 i.HOC SFC W FSG 500-2 i.HOC SFC W
Working pressure psi 90 125 145 90 125 145
Flow rate complete system at working pressure acfm 566 - 1,608 608 - 1,499 653 - 1,400 604 - 1,790 666 - 1,788 702 - 1,700
Max. positive pressure psi 90 145 145
Nominal motor output hp 350 450
Pressure dew point °F -10 -26 -30 -17 -27 -30
Dimensions
W x D x H in 		176 x 82 x 87 176 x 82 x 87
Compressed air connection6 ANSI class 150 6 ANSI class 150
Sound pressure level dB(A) 77 77
Weight lb 16,314 17,306

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