Air-main charging systems

Protecting compressed air quality – no overwhelming of the air treatment system

Compressed air treatment systems are designed for a certain rate of air flow which, when the system is operating at full load, pushes against the pressurized air in the air distribution network. However, should this resistance not be present, for example during periods of low load or downtime, it is possible that dryers and filters may be "overwhelmed" by the sudden surge in airflow that occurs when the system re-starts. DHS air-main charging systems reliably prevent this from occurring.

Thanks to a patented pulse width modulating control concept, every DHS air-main charging system is ready-prepared for all eventualities and, as is Kaeser‘s way, combines exceptional operational reliability with straightforward operation.

  • Connection diameters from 1" NPT to 2" NPT and 2" flange to 8" flange
  • Larger sizes available; please consult KAESER.
  • For systems with one or more treatment lines
  • Perfect integration thanks to various interfaces, configuration options and retrofit kits

Your advantages

  • Protection from impermissible air flow:
    With dropping pressure, the speed of flow in the pipework will quickly increase and potentially cause an overload of all air system components. The installation of a Kaeser DHS air-main charging system guarantees the required minimum pressure and ensures reliable operation, and in particular when re-starting the system following a shut-down.
  • Gentle pressure build-up in the system:
    A pulse width modulated control designed by Kaeser ensures that system intervention opening and closing sequences are performed in very small steps.
  • A brilliantly simple operating concept:
    Easy configuration in 25 languages, immediate recognition of the operating state, manual emergency-stop – time-saving features that also increase safety.
Your investment advantage: KAESER Life Cycle Management
Life-cycle costs

Even the best components are only as good as their integration into the overall system. With Kaeser, you benefit from individual consultation and intelligent technology that can be used universally and expanded as required.


Product details


Air-main charging system

  • Electronically controlled air-main charging system with pulse width modulation
  • Incremental opening and closing of the compressed air network prevents excessive flow speed of the air in dryers and filters.
  • Installation-ready complete system

Two operating modes

  • 1 – "Reliable compressed air supply": pulse width modulated opening and closing of ball and butterfly valve
  • 2 – "Reliable compressed air quality" for redundant air networks: in the event of faults in, for example, the dryer or filter, the concerned train is also shut-down (factory-preset)

Electronic control unit

Electronic control unit for Kaeser air main charging system
  • Integrated electronic pressure transducer
  • Pressure reducer 0 – 16 bar
  • High-visibility LED
  • Mechanical indicator
  • Processor unit
  • Display (25 languages)
  • Password protection
  • Mode selector switch
  • Control unit can be rotated by 90°
  • End position monitoring
  • Software update with microSD card
  • Anti-tamper seals for keyboard and operating mode switch to protect against unauthorized access
  • Multi-voltage: 90 – 260 V AC, 47 – 63 Hz, 24 V DC

Pivot drive

  • Spring-loaded pneumatic pivot drive
  • Activates the ball or butterfly valve with internal control pressure
  • Silicone-free grease for ball and butterfly valve


DHS air main charging systems – manual operation with key in the event of power failure

  • Password and operating parameter input via keyboard, e.g. opening pressure, hysteresis, opening/closing times in percent
  • Manual operation using key to open in the event of power failure or disruption


  • Relay inputs for "external shut-down" e.g. dryer alarm
  • Relay outputs for "group alarm", "open", "closed" and "pressure monitoring"
  • 4-20 mA air distribution network signal for compressor controllers or master control systems
  • Connection prepared for remote operation
  • Connection to compressed air network with Tecalan line (up to 16 bar included within scope of delivery)

Retrofit kits

  • Provided to retrofit existing Kaeser air-main charging systems
  • Kit comprises control unit and installation components

Reliable air-main charging
DHS air main charging system applications: Reliable air main charging
  1. Compressor
  2. Air receiver with ECO-DRAIN
  3. Refrigerated dryer with ECO-DRAIN
  4. Filtration with ECO-DRAIN
  1. Condensate treatment
  2. Compressed air signal
  3. DHS electronic air-main charging system
  4. Compressed air network

For individual systems that are regularly shut-down.

Reliable compressed air supply with air-main charging
DHS air main charging system applications: Reliable compressed air supply with air main charging
  1. Compressors
  2. Refrigerated dryer with ECO-DRAIN
  3. Filtration with ECO-DRAIN
  4. Air receiver with ECO-DRAIN
  1. Condensate treatment
  2. Compressed air signal
  3. DHS electronic air-main charging system
  4. Compressed air network
Reliable compressed air quality with air-main charging
DHS air main charging system applications: Reliable compressed air quality with air-main charging
  1. Compressors
  2. Air receiver
  3. Refrigerated dryers with ECO-DRAIN
  4. Filtration with ECO-DRAIN
  1. Electronic air-main charging system
  3. Condensate treatment
  4. Compressed air system
Technical specifications

The technical specifications can be found in this brochure: