STULZ CyberAir 3PRO DX GE4(S) air conditioning range for data centres

Designed for use in data centres, the CyberAir 3PRO DX GE4(S) range has been developed by mission-critical air conditioning specialist STULZ. The latest addition to the GE series of precision air conditioning systems with indirect free cooling, the range is available in three sizes with capacities from 24–71 kW to suit a variety of room volumes and power requirements. Various equipment options are also available to allow for individual customer requirements.

To minimise environmental impact, the range is configured to use A2L R454C refrigerant. A2L refrigerants, named after their ASHRAE safety classification, are non-toxic and flame-retardant. They deliver high levels of energy efficiency and have reduced global warming potential (GWP) ratings. R454C has a GWP of 148 and meets the requirements of the F-Gas Regulation 2024/573.

As safety is vital in mission-critical environments, a central element of the range is an internal safety concept, which has been specially developed for use with low-GWP refrigerants. The refrigeration circuit is certified and tested to be permanently leakproof, while its optimised design also prevents refrigerant build-up within the unit. Additionally, two explosion-proof gas sensors are located in the housing and the control cabinet to continuously monitor refrigerant concentration. If elevated levels are detected, the system automatically shuts down all electrical components, except the fans, and triggers an alarm.

The advanced E² control system with touchscreen display is designed to be user-friendly, enabling intuitive operation. Already used across the CyberAir Mini series, the E² control system has been further optimised for the new range with support for various interfaces and protocols including Modbus RTU, BACnet IP, BACnet MS/TP, HTTP and SNMP. This helps facilitate seamless integration into an existing building management system, while functions such as device detection, access control, event and trend recording, and emergency operating mode provide operational transparency.