Performance, Precision, Partnership

HSD Series - Dual Compressor 1:1 Direct Drive Equipment

Complete unit

  • Ready for operation
  • Fully automatic
  • Super sound-proofed
  • Vibration-damped
  • All panels powder-coated
  • For ambient temperatures up to +45 °C
  • Service-friendly design: Motor bearing lubrication from the outside



  • Single stage with cooling fluid injection for optimal rotor cooling
  • Genuine KAESER rotary screw airend with energy-saving SIGMA profile
  • 1:1 Direct drive


Cooling fluid and air circuit

  • Dry air intake filter with pre-filtration
  • Inlet silencer
  • Inlet and vent valves, pneumatic
  • Cooling fluid separator tank with three-stage separator system
  • Pressure relief valve
  • Minimum pressure check valve
  • Thermostatic valve and eco fluid filter in coolant circuit
  • Fluid and compressed air cooler, water-cooled
  • Kaeser centrifugal separator with electronically-controlled condensate drain for energy savings without pressure loss
  • Piping and centrifugal separator made from stainless steel
  • Package water-cooled as standard: Fluid and compressed air aftercooler implemented as plate or optionally available tube-type heat exchanger.


Heat recovery (Option)

  • Optionally available with integrated fluid/water plate-type heat exchanger and additional fluid thermostatic valve
  • External connections



  • Water-cooling as standard
  • Soldered plate heat exchanger
  • Machine interior ventilation via two independently controllable fans


Electrical components

  • Premium Efficiency IE4 drive motor with three Pt100 winding temperature transducers for engine monitoring
  • Control cabinet to IP 54
  • Switching cabinet ventilation
  • Automatic star-delta starter
  • Overload relays
  • Control transformer




  • Interfaces for data communication comprising RS 232 for a modem, RS 485 for a slave compressor in base load sequencing mode
  • Profibus DP interface for data networks
  • Ergonomic control panel: Red, yellow and green LEDs show the operational state of the machine at a glance
  • Four-line plain text display
  • 30 selectable languages
  • Touch keys with icons
  • Duty cycle indicator
  • Fully automatic monitoring and regulation of airend discharge temperature; monitoring of motor current, direction of airend rotation, air filter, fluid filter and fluid separator cartridge
  • Display of performance data
  • Service intervals of primary components
  • Maintenance interval counter
  • Display of status data
  • Event memory