INDUSTRY NEWS: posted 27 February 2018

Chiller using R-1234ze refrigerant now available with output range 300 to 1000 kW

STULZ is extending its product portfolio to include new “ze chillers” in the CyberCool 2 series. These employ proven CyberCool 2 technology and have been optimised specifically for use with climate-friendly HFO-1234ze refrigerant.

STULZ is expanding its product portfolio with additional “ze chillers” in the CyberCool 2 series. These new chillers are available in air-cooled versions and are designed for use with eco-friendly R-1234ze refrigerant. This HFO blend has a very low global warming potential (GWP) and, in the context of (EU) regulation no. 517/2014 and together with refrigerant shortages, is a future-proof and efficient alternative to conventional HFC-based refrigerants. STULZ CyberCool 2 ze chillers are available in various output capacities from 300 to 1000 kW and offer reliable and efficient cooling solutions for medium and large data centres, telecommunications and industrial applications.

Like the CyberCool 2 chillers that were introduced in 2013, the ze series is also equipped with the largest possible EC fans and sound-insulated compressor chambers to reduce noise emissions. Thanks to the dynamic control technology developed by STULZ, the CyberCool 2 also supports indirect free cooling. In particular, this intelligent way of changing over between compressor operation and indirect free cooling facilitates resource-saving operation coupled with maximum energy efficiency. STULZ’s Mix Mode Boost technology can also use the entire surface of DX coils without needing to regulate the fan speed, which further increases energy efficiency and significantly reduces operating costs. Microchannel condensers constructed entirely of aluminium and equipped with air baffles also optimise flow into the inner coil elements.

For more information, please visit

About STULZ?

Since it was founded in 1947, the STULZ company has evolved into one of the world’s leading suppliers of air conditioning technology. With the manufacture of precision air conditioning units and chillers, the sale of air conditioning and humidifying systems and service and facility management, this division of the STULZ Group achieved sales of around 420 million euros in 2016. Since 1974 the Group has seen continual international expansion of its air conditioning business, specializing in air conditioning for data centers and telecommunications installations. STULZ employs 2,300 workers at ten production sites (two in Germany, in Italy, the U.S., two in China, Brazil, and India) and nineteen sales companies (in Germany, France, Italy, the United Kingdom, the Netherlands, Mexico, Austria, Belgium, New Zealand, Poland, Brazil, Spain, China, India, Indonesia, Singapore, South Africa, Australia, and the U.S.). The company also cooperates with sales and service partners in over 135 other countries, and therefore boasts an international network of air conditioning specialists. The STULZ Group employs around 6,700 people worldwide. Current annual sales are around 1,200 million euros.

For all UK enquiries, please visit or contact STULZ UK on +44 (0) 1372 749666 or email

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