STULZ has introduced the fourth generation of its TelAir and WallAir cooling series for 5G, edge and critical infrastructure applications. TelAir 4 and WallAir 4 use low-GWP R454C refrigerant, integrated free cooling and an EN 378-compliant safety architecture, addressing requirements under the amended European F-Gas Regulation (EU) 2024/573.
TelAir 4 is designed for indoor installation, while WallAir 4 can be mounted externally on a container wall as a monoblock solution. Both are offered in two standard enclosure sizes and four cooling capacity classes from 6-17 kW (approx. 20,500-58,000 BTU/h), for applications including telecommunications containers, shelters, radio stations and edge data centers.
In combined free cooling and mixed-mode operation, the units can reduce operating costs by up to 80%. EC fans comply with requirements of the upcoming ErP 2027 Ecodesign Directive. Both series operate from -20°C to +54°C (-4°F to 129°F), with an optional winter kit extending operation to -40°C (-40°F).
Customers can select on/off TF/WF systems with thermostatic expansion valves or TV/WV versions with continuously modulating EC inverter compressors and electronic expansion valves. Both configurations have hermetically sealed refrigeration circuits. The EN 378-compliant safety architecture for A2L refrigerants uses a two-stage sensor system: at 10% of the lower flammability limit, maximum fan speed is activated and other power consumers are shut down; at 20% LFL, the unit is fully disconnected from the power supply.
TelAir 4 supports downflow and displacement airflow concepts, while WallAir 4 uses displacement airflow. The E² BASIC controller includes Ethernet, Modbus, inputs and outputs for building management and DCIM integration, password-protected access levels, and dedicated inputs for fire, smoke and intrusion alarms.
“For the fourth generation of the TelAir and WallAir cooling series, we set out to create two distinct cooling solutions that deliver outstanding flexibility across a wide range of edge, 5G and critical infrastructure applications,” said Anika Do, global product manager at STULZ. The units are available to order immediately.
