CyberAir 3PRO DX

The benchmark of flexibility and energy efficiency

The CyberAir 3 PRO DX is the result of more than three decades of experience with projects around the world, and is the logical next step in the development of the successful CyberAir 3 series. To achieve maximum cooling capacity with a minimall footprint while promising you maximum potential savings, these units are more adaptable than any other precision air conditioning unit on the market.

Solutions for the CyberAir 3PRO DX

  • Room cooling

  • Small and medium-sized Data Centers

  • Equipment rooms

  • High-density Data Centers

  • Direct Free Cooling

  • Indirect Free Cooling

  • For use in the IT sector and medicine/hospitals



  • Technological leader when it comes to cooling capacity with maximum efficiency

  • Maximum cooling capacity with a minimal footprint

  • Air conduction with maximum efficiency

  • Further reduction in operating costs as supply air conditions conform to the ASHRAE recommendation

  • Maximum potential savings thanks to Indirect Dynamic Free Cooling from STULZ

  • Cools reliably, precisely, quietly and exceptionally economically

  • Designed for a long service life

  • Use of EC technology for maximum efficiency

  • Compact design for easier transport and installation

  • Option of having your unit tested in our Test Center

  • Control based on supply air, return air or room air

  • Benjamin Petschke, Product Manager

    "Thousands of customers around the world rely on units from the CyberAir series, being continuously developed for guaranteeing maximum benefits to customers."

Indirect Dynamic Free Cooling

STULZ Indirect Dynamic Free Cooling achieves up to 60 % more savings.

Indirect Dynamic Free Cooling

Direct Free Cooling

The CyberAir 3 DX precision air conditioning system with Direct Free Cooling air conditions Data Centers up to 90 % more economically than conventional compressor cooling systems.

Direct Free Cooling


Two designs for individual installation options

ASD and ASU versions

The design with integrated fans is available with standard ASD (Downflow) and ASU (Upflow) air conduction. Through further development and by optimizing the design, the units are now considerably more efficient than the previous version. This can be witnessed in the noticeably higher Energy Efficiency Ratio (EER) and lower Airflow Efficiency Ratio (AER).

ASR version

The ASR (Raised Floor) series promises even higher energy savings than units with fans on the raised floor. This model is equipped with an external fan box, and air conduction is specific to the unit. The fan box is installed under the unit, in the raised floor.


The resulting additional space in the air conditioning unit can be used for larger heat exchangers, resulting in a noticeably higher cooling capacity for the footprint. What’s more, positioning the fans in the raised floor means less turbulence and fewer changes in airflow direction. The result is ideal air conduction and therefore massively reduced fan power consumption (AER).


Specific air conduction systems


With two designs and air conduction systems specifically optimized for each unit, the CyberAir 3PRO DX ensures maximum flexibility for integration in your system


  • ASU Upflow

  • ASU Downflow

  • ASR front/back/down

  • ASR Front

The best result with the right system

More information

Variety of options for the CyberAir 3PRO DX

More information

Optimized unit design for maximum potential savings

The design of our units means that STULZ precision air conditioning units boast maximum EER values and the lowest AER (Airflow Efficiency Ratio) values, and therefore achieve air conduction with maximum efficiency. The AER describes the ratio of the fan power consumption to the airflow. ASR air conduction (fans integrated in the raised floor), in particular, hugely reduces fan power consumption by ensuring minimal turbulence and changes in airflow direction, for energy savings that you will notice straight away.

Precise control


Our dynamic control allows an adaptation to important IT requirements such as the precise and effective adjustment of the air-side temperature difference (Delta-T) of cooling units to the Delta-T of the server racks. 


Optimum supply air conditions for reliability and maximum efficiency

To cool your data center as efficiently as possible without compromising on reliability, ASHRAE has published a recommendation for the air temperature at the server inlet. We have been developing air conditioning units for mission-critical applications – where even tiny malfunctions can have serious consequences – for decades now. Not only that, we have always focused on energy efficiency, and because of this, the supply air temperatures of our units lie within ASHRAE’s recommended range.

EC fan optimized for specific units

  • Fan speed control
  • Minimal power consumption
  • Low noise
  • Nominal airflow rate at a fan speed optimized for partial load mode
  • Increased airflow for the size
  • State-of-the-art motors, electronic processor and impellers
  • Satisfies current ErP Ecodesign Directive
  • Aerodynamically optimized vanes
  • Integrated soft start

EC compressor

  • Infinite compressor control for maximum efficiency and precise temperature regulation
  • Maximum efficiency especially in partial load and Mixed mode
  • Constant supply air temperature
  • Integrated soft start
  • Fast, precise reaction to actual variations in heat load
  • Long service life thanks to continuous operation without compressor on/off cycles

Reliable control, monitoring for peace of mind

  • In-house developed controller for regulating and monitoring the air conditioning system
  • Autonomous controllers in every air conditioning unit for high redundancy and availability
  • Sequencing with standby functions
  • Control of up to 20 air conditioning modules
  • Data bus system
  • UPS operation with configurable components for low unit power consumption
  • Recording of room climate
  • Service interface
  • Modbus protocol preinstalled

CyberAir "Best of 2015"

In 2015, the STULZ CyberAir received the IT INNOVATION AWARD. The panel of experts from the Medium-sized Enterprises Initiative named the CyberAir the BEST OF 2015 in the "Green IT" category.



  • STULZ CyberAir 3PRO DX ASR Brochure 1805 EN

    Maximum energy efficiency and optimum air conduction
    with fans in the raised floor

    • File: STULZ_CyberAir_3PRO_DX_ASR_brochure_1805_EN.pdf

    • Type: Adobe PDF

    • Size: 1,34 MB

    • Language: English

    • Date: 2018-05-16

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