CyberCool Free Cooling Booster

Free Cooling for water-cooled chillers

Systems with water-cooled chillers do not usually offer Free Cooling, even if the low outdoor temperatures at the installation site would allow it. However, since Free Cooling – as well as a precise Mixed mode concept – offer the greatest potential savings, STULZ has developed a standard unit that benefits from low outdoor temperatures and thus ensures efficient operation all year round.

Solutions for the CyberCool Free Cooling Booster

  • Free Cooling

  • Plug & Play

  • Retrofit

  • Data Center

  • Industry



  • Significant energy savings thanks to Free Cooling including Mixed mode

  • Low commissioning times and installation costs thanks to plug-and-play principle

  • High reliability thanks to redundancy concept and precise thermodynamic design

  • Retrofitting without complex and time-consuming planning

Retrofit your chilled water system

Existing chilled water solutions can be retrofitted with the CyberCool Free Cooling Booster without complex and time-consuming planning. The unit's unique functionality and reliability includes tested and approved hydraulics, matched components and the in-house developed STULZ control system, which ensures trouble-free operation of all units. 



  • With or without glycol in the consumer circuit

  • Maintenance-friendly design

  • Energy-saving, variable speed pumps

  • Both indoor and outdoor installation possible

  • Trained and experienced sales and service partners in over 140 countries

Technical Data

Cooling capacity total (kW)

270 – 1.800

Flow rate (m³/h)

59.4 – 260.9



Dimensions (mm)

Height: 2,126 – 2,467
Width: 1,909 – 2,360
Depth: 1,404 – 4,279

Weight (kg)

1,140 – 4,655

Free Cooling with Mixed mode

Free Cooling is an intelligent solution for minimizing energy-intensive compressor mode and significantly cutting operating costs. CyberCool Free Cooling Booster offers three operating modes and always selects the most efficient mode depending on the outside temperature - reliably throughout the year.

Free Cooling calculator
Calculate the potential of Free Cooling at your location.

Savings up to 210,000 € a year with CyberCool Free Cooling Booster

With Free CoolingWithout Free Cooling
Energy consumption1,643,576 kWh3,043,586 kWh
Energy costs246,536 €456,538 €
Savings per year210,001 €


Energy consumption using the example of a system with TSI1400 chiller, WFM05 CyberCool Free Cooling Booster and EHLD1F 1297 A dry coolers; operating temperature:18/12 °C; based on the temperature profile of the city of Hamburg, 0.15 €/kWh

Quick and easy installation

CyberCool Free Cooling Booster is a high-performance solution designed for plug-and-play installations, making it suitable for any location.

The standard unit is a pre-installed system that contains all important hydraulic components, so that installers don't need to take any construction measures to integrate Free Cooling. Due to the unit design, the Free Cooling modules can be installed quickly and easily, which reduces commissioning times and installation costs significantly.

Illustration with animation

With or without glycol

CyberCool Free Cooling Booster features a built-in intermediate heat exchanger, which isolates the user from the dry cooler circuit, ensuring safe operation in case of leakages.


Control and Monitoring controller

Thanks to its own switch cabinet including controller, optimum control and perfect communication with chillers and dry coolers are ensured. monitors both the outdoor and the operating temperature and regulates the cooling capacity of the dry cooler. Optimum control of the condensing temperature and maximum amount of Free Cooling hours are ensured even at high outdoor temperatures. This results in minimal operating costs and a low CO2 footprint. features

  • Intuitive user interface via 7" touch screen
  • Ethernet port RJ32
  • RS485 ModBus
  • Alarm management
  • Alarm history display



The variety of options and possible equipment enables you to perfectly adapt STULZ units to your requirements.

  • 1 or 2 variable speed centrifugal pumps – user side
  • Panelled version Epoxy coated RAL7035 for outdoor installation
  • Energy meter
  • Remote dry cooler with EC fans
  • Flowmeters
  • Antifreeze heater
  • Electrical panel heater

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: CyberCool Free Cooling Booster 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.

Learn more about Climate. Customized.



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