Stulz Launches TelAir 4 and WallAir 4 for Telecom Container and Edge Data Centre Cooling

Stulz has presented the fourth generation of its monoblock climate series TelAir and WallAir, designed for cooling telecom containers, shelters, radio stations, and compact Edge data centres.

Two mounting options and four cooling classes

TelAir 4 is installed inside the container, while WallAir 4 is mounted externally on the wall, freeing up internal space for racks. Each series is available in two cabinet sizes and four cooling capacity classes — from 6 to 17 kW. By system type, customers can choose On/Off variants (TF/WF) with a thermostatic expansion valve or stepwise-modulating EC inverter compressors (TV/WV) with an electronic expansion valve.

Refrigerants and energy efficiency

Sealed refrigeration circuits in the EU operate on R454C (GWP 148); an alternative R513A is available for the export market. According to Stulz, in a combined free-cooling and mixed-cycle mode, operating costs can be reduced by up to 80 % depending on installation conditions. EC fans already comply with the limit values of the ErP 2027 directive. The operating range for outdoor temperatures is from −20 to +54 °C; with a winter kit — down to −40 °C. Optional emergency ventilation (48 V DC or 230 V AC) provides cooling during a power outage.

Safety when working with A2L refrigerants

In accordance with EN 378, a multi-level safety architecture is provided for A2L refrigerants: the lower evaporator fan dilutes the escaping gas; a two-stage sensor system at 10 % of the lower flammability limit switches the fan to maximum speed and disconnects other consumers, and at 20 % — de-energises the unit. The control panel is housed in an IP54 enclosure.

Air distribution and compatibility

TelAir 4 supports Downflow and Displacement configurations, optionally with adjustable grilles; WallAir 4 operates on the Displacement principle. Cabinet dimensions and wall opening sizes are compatible with previous generations; maintenance is performed through the front panel.

Control

The E²-Basic controller is equipped with Ethernet and Modbus interfaces, password-protected access levels, inputs for fire, smoke, and security alarm signals, a LAN sequence for up to 10 devices, and an alarm log for 250 events.

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