STULZ introduces fourth-generation cooling units
Author: Joe Peck
STULZ, a manufacturer of mission-critical air conditioning technology, has introduced the fourth generation of its TelAir and WallAir cooling series for edge, 5G, and critical infrastructure applications.
The TelAir 4 and WallAir 4 units use R454C refrigerant, integrated free cooling, and an EN 378-compliant safety architecture. They are designed for edge data centres, telecommunications containers, shelters, and radio stations.
The units are available with two installation concepts: TelAir 4 is designed for indoor installation, whilst WallAir 4 can be mounted externally on a container wall.
Anika Do, Global Product Manager at STULZ, explains that, “Both are available in two standard enclosure sizes and four cooling capacity classes, ranging from 6–17kW.”
The units are designed to address increasing thermal densities and the requirements of the amended European F-Gas Regulation (EU) 2024/573.
Free cooling cuts energy use
STULZ says the units can reduce operating costs by up to 80% when using combined free cooling and mixed-mode operation. The electronically commutated (EC) fans also comply with the requirements of the upcoming ErP 2027 Ecodesign Directive.
Both models operate from -20°C to +54°C, while an optional winter kit can extend operation down to -40°C.
Customers can choose between on/off systems with a thermostatic expansion valve, or continuously modulating EC inverter compressors paired with an electronic expansion valve. Both configurations have hermetically sealed refrigeration circuits.
The units also feature a multi-stage safety architecture designed for A2L refrigerants such as R454C. In the event of a refrigerant leak, the evaporator fan can increase to maximum speed to dilute and extract refrigerant gases.
A two-stage sensor system activates maximum fan speed and shuts down other power consumers at 10% of the lower flammability limit (LFL). At 20% LFL, the unit is fully disconnected from the power supply. Meanwhile, an enclosed IP54 control cabinet is designed to eliminate potential ignition sources.
TelAir 4 supports downflow and displacement airflow concepts, with optional adjustable outlet grilles for horizontal or vertical air distribution. WallAir 4 uses displacement cooling to provide direct cold air stratification within the room.
Additionally, TelAir 4 specifically can be installed within a wall, providing protection against weather and vandalism, whilst also reducing noise emissions for use in residential and mixed-use areas.
Both units use the E² BASIC controller, which includes an ethernet interface, Modbus, and multiple inputs and outputs for integration with building management and data centre infrastructure management (DCIM) systems.
Password-protected access levels are included, alongside inputs for monitoring fire, smoke, and intrusion alarms.
Anika continues, “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.
“By combining cutting edge technology with modern design, ease of use, energy efficiency and reliability, we have achieved that goal. The new units are available to order immediately, with STULZ account managers able to provide further information and tailored advice.”
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