CyberAir 3PRO DX

The benchmark of flexibility and energy efficiency

The CyberAir 3PRO 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 minimal 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 3 PRO DX

  • Room cooling

  • Small and medium-sized Data Centers

  • Equipment rooms

  • High-density Data Centers

  • Direct Free Cooling

  • Indirect Free Cooling

  • IT sector and medicine/hospitals

Technical Data

Cooling capacity total (kW)

20 - 150

Airflow volume (m3/h)

4,000 - 32,000



Air conduction

Upflow, Downflow,

Downflow with outlet




R410A (GWP: 2,088)

R407C (GWP: 1,774)

R134a (GWP: 1,430)





  • 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




A model of adaptability


From standard units to fully customized solutions

The ability to offer such a wide range to customers is the embodiment of our philosophy, "Climate. Customized.". Size, design, air conduction, system or control: CyberAir 3PRO DX is a model of adaptability and the units can be precisely adapted to your individual requirements. In addition, a variety of options and equipment versions are available to achieve the optimum result.


Two designs for individual installation options

Downflow and Upflow versions

The design with integrated fans is available with standard Downflow (ASD) and Upflow (ASU) 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).

Raised Floor version

The Raised Floor (ASR) 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.

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. 

Blog article "Delta-T - air-side temperature difference"

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
  • Autonomuous controllers in every air conditioning unit for high redundancy and availability
  • Sequencing with standby functions
  • Control of up to 20 air conditioning units
  • Data bus system
  • UPS operation with configurable components for low unit power consumption
  • Recording of room climate
  • Service interface
  • Modbus protocol preinstalled

Test to your specifications

In our state-of-the-art, 700-square-meter Test Center with its various climate chambers, we can perform a variety of tests on precision air conditioning units and chillers. During the development of the CyberAir 3PRO DX, for example, we were able to test and optimize it under all climatic conditions encountered around the world.

In addition, we offer you the opportunity to book a witness test in our Test Center. This allows you to have the desired air conditioning system tested according to your exact specifications, creating transparency and providing you with information about your system’s performance and energy consumption.

Learn more about our test center

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