Precision air conditioning unit for outdoor installation

WallAir units are compact and weatherproof air conditioning units that are mounted outside the container and so enable the container space to be used to the full.

Solutions for WallAir units

  • Shelter cooling

  • Modular Data Centers

  • Direct Free Cooling

  • For use in telecommunications, infrastructure






  • Innovative, high-quality components for low energy consumption

  • Low refrigerant quantity (less than 10 tons CO2 equivalent)

  • No annual leak test required in accordance with F-gas regulation*

    *Due to low refrigerant quantity and hermetically sealed refrigerant circuit (standard for EC compressor, optional for On/Off compressor)

  • The units are plug and play and therefore immediately ready for connection and use

  • Connectivity: Monitoring and remote access available via a web interface

  • Backup operation (Free Cooling and backup cooling) on failure of the main power supply

  • Automatic restart after power failure

  • Robust and designed for continuous 24/7 operation, 365 days a year

Technical Data

Cooling capacity total (kW)

4 - 16




Optimum operational reliability for your application


Backup operation for maximum reliability

In telecommunications, in particular, high reliability is vital to prevent any loss of network availability. Thanks to the additional 48 V DC power source, backup operation with Free Cooling is available. If the main power supply fails, the Shelter Cooling units continue providing backup cooling to keep your system running reliably.


Connectivity for maximum availability

Monitoring and remote diagnosis are available for all units via a web interface. This enables rapid intervention and therefore immediate troubleshooting in all situations. What’s more, our units support numerous communication protocols for integration in building services management systems.


  • Uwe Kudszus, Product Manager

    "Compact, robust, economical and reliable in continuous operation - that's what WallAir units from STULZ stand for. These features are especially important in the case of wireless telecommunications containers distributed over a wide area, as the service engineers frequently have to travel long distances and the containers have to be cooled with the utmost reliability."

Advantages of the speed-controlled EC compressor

  • Maximum energy efficiency in partial load mode
  • Constant supply air temperature
  • Refrigerant R410a
  • Integrated compressor soft start
  • Long service life thanks to continuous operation without compressor on/off cycles


Air conduction with maximum flexibility

Displacement units enable cold supply air to flow close to the floor at low speed. The resulting “pool” of cold air on the floor prevents hot and cold air from mixing. This principle increases the number of operating hours with Free Cooling, achieving maximum potential savings.



  • Reduced running costs thanks to Free Cooling and Mixed mode, Displacement principle, Condensation pressure control

  • Factory tested, filled with refrigerant and ready for operation from the very first day

  • Available with EC compressor

  • Outside air conditions: –20 °C winter/+50 °C summer

  • Automatic restart after power failure

  • Refrigerant R407C for On/Off compressors

  • Filter monitor and airflow alarm

  • Inside and outside temperature sensors

  • Zigzag filter class ISO 16890: ePM10 50 %

  • Condenser with microchannel technology


Control and monitoring

The consists of a controller and optional operator terminal. The controller manages all functions of the WallAir unit. The operator terminal, consisting of a keypad and LCD, displays the most important operating states and alerts.


The enables up to ten units to be configured in a single air conditioning system. If an individual unit drops out or the heat load rises, the standby unit is switched in for additional support.

Night Mode

  • Time-controlled limitation of the condenser and evaporator fan speed for quiet operation
  • Energy-saving mode

Monitoring and alarm relaying

  • Via BMS systems (Modbus onboard, further protocols via WIB 1000)
  • Nine potential free contacts are available: Alarms can be assigned a high or low priority
  • Via GSM modem (CompTrol SMS)

Simple configuration and software updates

  • Central configuration of units from a laptop
  • Hardware key for uploading and downloading software without a laptop and/or copying the configuration onto other units





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