CyberAir 3PRO CW

Innovative chilled water cooling for data centers. Made in Germany.

The CyberAir 3PRO CW controls the conditions in the data center with the utmost precision, reliability and energy efficiency. Because STULZ technology leads the field, it can exploit potential savings to the full while still ensuring maximum reliability.

Solutions for CyberAir 3PRO CW

  • Room cooling

  • Medium-sized to large data centers

  • High Density

  • Direct Free Cooling

  • Indirect Free Cooling

  • Technology rooms

  • IT Industry

  • Hospitals



  • Maximum potential savings with Indirect Dynamic or Direct Free Cooling

  • Maximum cooling capacity with a minimal footprint

  • Highly efficient air conduction (Airflow Efficiency Ratio)

  • Optimized for operating conditions based on the ASHRAE recommendation

  • Superior EER values due to maximum size heat exchangers and filter surfaces

  • Minimal pressure drops thanks to the unit's optimum design

  • EC fans reduce power consumption

  • Compact design facilitates transport and installation

  • Control based on the supply air, return air, room air and server inlet temperature

  • CW-Standby-Management, Differential Pressure Control and Filter-Control-Management

  • Individual unit test at the STULZ Test Center


Technical Data

Cooling capacity total (kW)

25 - 260

Airflow volume (m3/h)

7,000 - 51,000




ABR range: Optimized for large and hyperscale data centers

This size was developed to meet the requirements of large data centers while keeping an eye on efficiency and reliability. By maximizing unit dimensions, this new size delivers more cooling capacity per footprint and increases efficiency in large and hyperscale data centers.

Benefits of the ABR range

  • High cooling capacity per footprint

  • Minimum fan power consumption thanks to the reduced internal pressure losses

  • Optimized Energy Efficiency Ratio (EER)

  • Optimized AER (Airflow Efficiency Ratio) and therefore air conduction with maximum efficiency

  • Increased Free Cooling times of the chiller due to higher air and water temperatures

  • Optimization of air temperatures based on the ASHRAE recommendation

  • Reduced water flow rate

    Therefore lower overall power consumption of the system and lower investment costs as smaller hydraulic components can be used

  • ASR Front/Back/Down

  • ASR Front

  • ASH Down

  • ASH Displacement

  • ASD Downflow

  • ASU Upflow

Indirect Dynamic Free Cooling

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

Direct Free Cooling

The CyberAir 3PRO 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

  • Norbert Wenk, Product Manager

    "Reliability and energy efficiency are the principal challenges for all data center operators. The CyberAir 3PRO CW has been developed to satisfy both these requirements."

Fans in the raised floor

The CyberAir 3PRO CW offers four air conduction systems. ASR air conduction (fans integrated under 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.

EC fan with 630 mm diameter

Increased energy efficiency, reduced power consumption and noise:

  • Specially developed for the STULZ CyberAir 3PRO
  • Speed-controlled fan
  • Minimal power consumption
  • Reduced noise
  • Nominal airflow rate at a fan speed optimized for partial load
  • High airflow in each size
  • State-of-the-art motors, electronic processor and impellers
  • Aerodynamically optimized vanes
  • Integrated soft start
  • Surpasses the requirements of EU Ecodesign Directive ErP 2015

Heat exchangers with optimized Energy Efficiency Ratio (EER)

The new CyberAir 3PRO CW has enabled EER values to be considerably increased even further. This was achieved by modifying the geometry of the heat exchangers and optimizing the unit's design to ensure minimal pressure drops, greatly increasing efficiency.


Optimized heat transfer

In chilled water systems, the heat exchangers are the most important component and a guarantee of the best possible heat transfer. The heat exchanger system of the CyberAir 3PRO CW is continually being further developed and optimized for the latest data center applications. Different versions of heat exchangers are available, ensuring the flexibility to satisfy every customer's specific requirements.

Special solution for modernized data centers:

A special heat exchanger is suitable for operation at high air-side and low water-side temperatures – and therefore for data center modernization projects where old chillers will continue to be used. This configuration enables supply air conditions in accordance with the ASHRAE recommendation.

Advantages of the optimized heat transfer at a glance

• Optimized cooling unit geometry
• Reduced water and air-side pressure drops
• Several versions for maximum flexibility

Optimum supply air conditions as per ASHRAE recommendation

In order to cool data centers as efficiently as possible without compromising on reliability in return, ASHRAE has published a recommendation for the air temperature at the server inlet. For decades, STULZ has been developing air conditioning units for mission-critical applications, in which malfunctions could have severe consequences. However, in order to keep a constant eye on energy efficiency as well, the supply air conditions of the CyberAir 3PRO CW have been optimized to achieve the range recommended by ASHRAE.

Mollier hx diagram with ASHRAE recommendation

Dynamic control for precise temperature regulation

The air-side difference in temperature between the air inlet and outlet of server cabinets and air conditioning systems is known as ΔT. To ensure optimum operation and the greatest possible savings on running costs, it is vital that the ΔT of the air conditioning units is adapted precisely and efficiently to the ΔT of your server cabinets.

The dynamic control enables this adaptation to changing IT requirements, thereby ensuring maximum energy efficiency during operation.

(Chart left: Schematic view)

We offer individual system solutions that are specially tailored to your project requirements. Choose your system.


Safe control, reliable monitoring

Everything at a glance with the C7000 controller:

  • Autonomous controllers in every air conditioning module ensure maximum redundancy (no chain reaction if a module fails)
  • Optional sequencing with standby functions enables the individual air conditioning modules of a group to be used to a greater or lesser extent with the utmost flexibility
  • Central control of up to 20 air conditioning modules per data bus system is possible
STULZ Services

Contact us

Holsteiner Chaussee 283
22457 Hamburg 

Central Office: +49 40-5585-0
Fax: +49 40-5585-352

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