CyberAir 3PRO ASR

Maximum efficiency and optimum air distribution thanks to underfloor fan section

The CyberAir 3PRO ASR is the result of consistent further development of our thoroughly successful CyberAir 3 series. To reach maximum cooling performance with minimum floor space and maximum potential savings, we have developed the CyberAir 3PRO ASR series with underfloor fan section. Due to our long-term experience with worldwide projects we can present a product that offers even more flexibility and efficiency.


CyberAir 3 ASR air conditioning units in the standard door size are available as optimised energy and optimised output versions. The six sizes range from 950 to 3,110 mm in width.

Solutions for the CyberAir 3 PRO DX ASR

  • Room cooling

  • Small and medium-sized Data Centres

  • Equipment rooms

  • High-density Data Centres

  • Direct Free Cooling

  • Indirect Free Cooling

  • IT sector and medicine/hospitals



  • Maximum efficiency in cooling capacity

  • Maximum saving potentials thanks to Indirect Dynamic Free Cooling

  • Maximum cooling capacity per minimum footprint

  • Maximum efficiency in air conduction

  • Reduction of operation costs due to supply air conditions according to ASHRAE guidelines

  • Cools reliably, precisely, quietly and exceptionally economically

  • Designed for continuous, no-downtime operation over many years

  • Use of EC technology for maximum efficiency

  • Compact design for easier transport and installation

  • Opportunity to get your unit tested in our Test Centre

New series promises major potential savings

The new ASR series comprises a heat exchanger and fan module. Installing the fan module in the raised floor reduces pressure drops and improves energy efficiency.

The series offers:

  • Reduced fan power consumption thanks to its location in the raised floor
  • More sizes of EC compressor
  • Increased cooling capacity per footprint
  • Enlarged filter areas
  • GE and GES units with early switchover to Free Cooling mode, thanks to the enlarged heat exchanger surface 

This series is available for A, AS, GE and GES systems.

  • Benjamin Petschke, Product Manager

    "The new units of the CyberAir 3PRO DX series combine maximum reliability and unbeatable efficiency in an unique way."

Indirect Dynamic Free Cooling

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

Indirect Dynamic Free Cooling

Direct Free Cooling

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

Direct Free Cooling

EC fan optimised for CyberAir 3 

  • Reduced power consumption and noise
  • Nominal airflow rate at a fan speed optimised for partial load
  • Increased airflow in each size
  • Uses the latest motors, electronic processor and impellers
  • Complies with ecodesign ErP2015 directive

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

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"

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


Air conduction

The CyberAir 3PRO DX ASR is available as highly efficient version with underfloor fan section.

Variety of options for the CyberAir 3 DX



  • Cooling capacity of 30 kW to 150 kW

  • Maximum filter surfaces

  • Available with 2 refrigerants

  • Microprocessor control of all functions and components, even for combined units

  • Filter control management

  • All parts requiring maintenance can be accessed from the front

  • Filter class M5

  • Easy installation thanks to standard door sizes

  • Flexible installation in the Data Centre

  • Six sizes

  • 2 Cooling systems (A, AS, GE, GES)


Control and monitoring

  • C7000 controller for controlling and monitoring the air conditioning system
  • High level of redundancy and availability thanks to autonomous controllers in every air conditioning module
  • Sequencing with standby functions
  • Control of up to 20 air conditioning modules per 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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