Rotary screw air compressor with dryer and tank


If you're like most shop air compressor owners, you need a reliable source of clean, dry air that you don't have to think about on a daily basis. You have enough to do without designing and installing a new compressed air system. That's why KAESER offers the AIRTOWER—a more affordable but rugged shop compressor for any light industrial application including woodworking, machine shops, metal fabrication, and all sorts of vehicle maintenance and repair. The AIRTOWER is a quality alternative to piston and light duty rotary screw compressors.

AIRTOWERS are completely assembled and their compact design saves you precious floor space. They arrive ready for installation, saving you a lot of time and expense.

  • 3 to 7.5 hp
  • Pressure: 125, 155, and 217 psig
  • Flow rate range: 9 to 29 cfm

Your advantages

  • Ready to run:
    Install an AIRTOWER in no time at all. Simply connect to the power supply and compressed air distribution network and that's it—you're ready to go!
  • Protection from corrosion damage:
    Thanks to the integrated refrigerated dryer, the AIRTOWER package delivers a reliable supply of dry air that protects your tools and equipment from corrosion damage.
  • Simple maintenance:
    All maintenance and service points are easily accessible after removing the lightweight roto-molded polyethylene enclosure. The electronic condensate drain can be inspected via an opening on the cover.

Take a closer look at our all-in-one compressor package


Complete unit

SXC service – removable enclosure
  • Ready-to-run
  • Fully automatic
  • Super sound-proofed
  • Vibration-dampened
  • Double-skinned roto-molded polyethylene enclosure
  • Easy access to all service points


Sigma Profile rotors use approximately 10 to 20 percent less energy than conventional rotors of the same flow capacity.

Belt drive

  • Maintenance-free elastic belt
  • No re-tensioning

Fluid and air flow

  • Honeycomb dry air filter
  • Inlet with check valve
  • Pneumatic venting valve
  • Cooling fluid tank with separately installed separator cartridge
  • Safety relief valve
  • Minimum pressure / check valve
  • Micro-filter in the cooling fluid circuit


  • Air-cooled
  • Aluminum cooler for cooling fluid with separate fan motor
  • Second fan on drive motor shaft
  • Automatic warm-up control (only active at very low loads)

Refrigerated dryers

  • CFC-free R-513A refrigerant
  • Control cabinet to IP 54
  • Overcurrent trip
  • Control transformer

Electric motor

  • Premium efficiency motor (IE3)
  • IP 54
  • Insulation class F for greater power reserve

Electrical components

  • Control cabinet to IP 54
  • Automatic wye-delta starter (above 4 hp)
  • Overload relay
  • Control transformer


  • Internally coated
  • Electronically controlled, zero-loss compressed air condensate drain

Sigma Control 2

SIGMA CONTROL 2 compressor controller
  • "Traffic-light" LED indicators for at-a-glance operational control
  • Easy to read display
  • 30 selectable languages
  • Soft-touch keys with icons
  • Fully automatic monitoring and control
  • Dual, Quadro, Vario, and Continuous control included as standard
  • Interfaces: Ethernet
  • Additional optional communications modules for: Profibus DP, Modbus, Profinet, and DeviceNet, EtherNet/IP
  • SD card slot for data-logging and updates
  • RFID reader
  • Web server
AIRTOWER component layout
SXC component layout
  1. Air filter
  2. Airend
  3. Drive motor
  4. Automatic belt tensioning
  5. Fluid separator tank
  6. Cooler
  7. Air receiver
  8. ECO DRAIN condensate drain
  9. Refrigerated dryer
  10. Compressed air outlet
  11. Control valve
Technical specifications

Standard version

ModelAirtower 3C Airtower 4C Airtower 5C
Working pressure psi 125 160 125 160 217 125 160 217
Flow rate Complete system at working pressure acfm 12 9 16 13 9 21 17 13
Max. positive pressure psi 125 160 125 160 217 125 160 217
Nominal motor output hp 3 4 5
Refrigerated dryerCT 4 CT 4 CT 8
Receiver volume gal. 56.8 56.8 56.8
Dimensions W x D x H in 24 x 39 x 58 24 x 39 x 58 24 x 39 x 58
Compressed air connection¾ NPT ¾ NPT ¾ NPT
Sound pressure level dB(A) 69 70 70
Weight lb 628 628 639

ModelAirtower 7.5C
Working pressure psi 125 160 217
Flow rate Complete system at working pressure acfm 28 24 19
Max. positive pressure psi 125 160 217
Nominal motor output hp 7.5
Refrigerated dryerCT 8
Receiver volume gal. 56.8
Dimensions W x D x H in 24 x 39 x 58
Compressed air connection¾ NPT
Sound pressure level dB(A) 70
Weight lb 661

Add-on refrigerated dryer

ModelCT 4 CT 8
Power consumption0.3 0.5
Pressure dew point °F 37 37
RefrigerantR 513A R 513A
Global warming potential 631 631
Refrigerant volume lb 0.38 0.44
Refrigerant mass as CO2 equivalent t 0.1 0.1
hermetic refrigeration circuit

Maintenance for the AIRTOWER Series
Maintenance tips

Check out these maintenance tips in this interactive ThingLink!

Learn more