Split air conditioner for Free Cooling in telecommunication containers

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Air conditioning units for flexible installation

The SplitAir is the space and energy-saving version for the reliable cooling of containers. The precision air conditioning unit consists of an indoor and an outdoor unit, and because the indoor unit can be mounted either on the wall or ceiling, it is ideal even when space is limited.

Optimized for air conditioning containers and modular buildings
Base station
Base station
Reliable air conditioning of telecommunication systems
Free Cooling
Free Cooling
Maximum potential savings by using cool outside air
Plug & Play
Plug & Play
Units immediately ready for connection and operation

Product Overview

At a glance

Most impotant benefits

  • Up to 83 % savings on outdoor air conditioner’s running costs thanks to Direct Free Cooling
  • Connectivity: Monitoring and remote access available via a web interface
  • Backup operation (Free Cooling and backup cooling) on failure of the main power supply

Most important features

  • Outside air conditions: -20 °C winter/+50 °C summer
  • Condensation pressure control

Most important technical data

  • Cooling capacity total (kW): 5 – 16
  • Up to 83 % savings on outdoor air conditioner’s running costs thanks to Direct Free Cooling
  • High flexibility thanks to various installation and air supply options
  • Connectivity: Monitoring and remote access available via a web interface
  • Backup operation (Free Cooling and backup cooling) on failure of the main power supply
  • Split air conditioner suitable for residential areas due to its low noise
  • Plug and play and therefore immediately ready for connection and use
  • Very long maintenance intervals
  • Robust and designed for continuous 24/7 operation, 365 days a year

  • Factory tested, filled with refrigerant and ready for operation from the very first day
  • Split system available with EC compressor
  • AC optionally with Free Cooling module
  • Condensation pressure control
  • Outside air conditions: -20 °C winter/+50 °C summer
  • Automatic restart after power failure
  • Filter monitor
  • Easy installation and maintenance
  • G3 air filter
Technical Data
Cooling capacity total (kW)5 – 16
Airflow volume (m³/h)1,110 – 3,300

R410A (GWP: 2,088)

R407C (GWP: 1,774)

R134a (GWP: 1,430)

All details about SplitAir

Climate. Customized.

From standard units to fully customized solutions

The ability to offer such a wide range to customers is the embodiment of our philosophy, "Climate. Customized.". Size, design or control: SplitAir is a model of adaptability and the shelter units can be precisely adapted to your individual requirements. In addition, a variety of options and equipment versions are available to achieve the optimum result.

Learn more about Climate. Customized.

Optimum operational reliability for your application

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.

  • Data recording
  • Remote configuration
  • Firmware updates
  • Alarm relaying

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.

Direct Free Cooling

In many base stations and small data centers, comfort air conditioning units without Free Cooling mode are still used today for air conditioning, with high energy consumption as the result. Units from STULZ’s Shelter Cooling series exploit the potential of Free Cooling, dramatically lowering your energy costs.
Savings with Direct Free Cooling

Efficient air conduction and intelligent control of operating modes enable savings of up to 83 % to be achieved.

Operating modes

Free Cooling mode

In many base stations, comfort air conditioning units without Free Cooling mode are still used today for air conditioning, with high energy consumption as the result. STULZ SplitAir units exploit the potential of Free Cooling and slash running costs.

SplitAir Free Cooling airflow
Mixed mode

STULZ SplitAir units feature Mixed mode. If the outside temperature exceeds a given threshold, Free Cooling alone is no longer sufficient. Then, in Mixed mode, the runtimes of the compressor are kept to a minimum by the simultaneous use of Free Cooling and compressor cooling. In this way, depending on the local temperature profile, annual energy costs can be cut by a further 10 %. Further potential savings are achieved by the split air conditioner working in partial load mode.

SplitAir mixed mode airflow
Compressor mode (DX)

If outside temperatures are so high that the outside air would no longer help to cool the inside, all cooling is generated using the compressor. Even in this mode, the perfectly harmonized components we use keep STULZ air conditioning units working reliably and efficiently.

SplitAir compressor mode airflow
Reliable operation in any weather conditions

Whether your business-critical system is working in temperatures of up to 55 °C, in ambient air contaminated by particles, in temperatures as low as -40 °C, or in a permanently humid environment – you can always rely on systems from STULZ.

Plug & Play
  • All products in the Shelter Cooling series are factory tested, filled with refrigerant and ready for connection and operation right from the start
  • Reduced installation time and costs
  • Speedier start-up

Flexibility thanks to variable air conduction

Due to the adjustable air supply via the front or underside of SplitAir indoor units, they are suitable for mounting both on the wall and ceiling.

SplitAir ceiling installation

Ceiling-mounted installation


SplitAir wall installation

Wall-mounted installation


EC compressor

Advantages of the speed-controlled EC compressor

  • Maximum energy efficiency in partial load mode
  • Constant supply air temperature
  • Refrigerant R410A
  • Integrated compressor soft start for low starting currents
  • Long service life thanks to continuous operation without compressor on/off cycles

Control and monitoring

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

Display SEC.blue


The SEC.blue 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)
  • 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

Options for the SplitAir

Thanks to the numerous options available, you can perfectly adapt all STULZ units including our split air conditioners to your particular requirements.

  • High-temperature operation up to 55 °C with R134a
  • Compressor soft start for low start-up currents
  • Electric heater
  • Air intake and blow-out grills
  • Heat exchangers coated for corrosion protection
  • Installation kit for outdoor unit
  • Air duct for indoor unit
  • Winter kit up to -40 °C

Close to you around the world

As a company with locations across the globe, we offer everything you need in the extremely dynamic world of information technology – plus professional advice in the right place at the right time.

With 21 subsidiaries, 11 production sites, and sales and service partners in over 140 countries, we make sure we are close to our customers wherever they are in the world.

Locations worldwide

Service and maintenance

Our trained and experienced sales and service partners are located in over 140 countries. The resulting proximity to our customers allows fast response times. In addition, regular training courses and an active exchange of information ensure high quality and an extensive knowledge of all our products. This way, you can be sure your products are in the best hands and get the right maintenance – all over the world.

Test Center

At our test center, you can have SplitAir units tested under your individual operating and site conditions. This creates transparency and confirms the unit's performance and energy consumption.


Find your individual STULZ contact

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