Multi Extension Air Setup

Information on how to install and configure your Multi Extension Air.


  • Power supply via 24VDC SELV adapter
  • 12x digital inputs 24VDC, input resistance: 10kΩ
  • 8x digital outputs (relays) 250VAC 16A for each relay, max. 48A total load
  • 4x PWM outputs 12-24VDC, 50W per channel
  • 1-Wire interface
  • Communicates with the Air Base Extension (SMA Female Antenna)
    Frequency: 868MHz (SRD band Europe), 915 MHz (ISM band region 2)
  • Convenient pairing with a learn button
  • Compact design for DIN rail mounting
  • Dimensions: 155 x 85 x 49 mm (9 breaker units)
  • Power consumption: < 350 mW
  • Maximum total power loss: 8.7W
  • Protection: IP20
  • Ambient Temperature: 0 to 50° C
  • Safety shutdown: If the CPU temperature increases over 80°C, all the digital outputs are turned off. Once the temperature drops below 65°C, the respective digital outputs are turned on. The CPU temperature is updated on startup and if there is a temperature change of more than 5°C.

Diagram Loxone Multi Extension Air

The total switching capacity of the extension must not exceed 11kW, due to thermal reasons. For example if all the relays are closed a maximum current of 5.7A at each relay is allowed. This is because there are 8 relays and at 240V 5.7A multiplied by 8 = ~ 11kW. This means the total switching capacity is over 45A, which is almost half of the inbound fuse of your whole house in the UK.


Diagram Loxone Multi Extension Air Dimensions


  • Mount the Multi Air Extension on the DIN rail
  • Connect 24VDC power supply, but do not switch on until the whole installation is completed
  • Connect the inputs and outputs
  • Turn on the power supply
  • After a few seconds, the left LED will flash green if the Multi Air Extension is already configured, orange if not.


First power up the Multi Extension Air and then press the learn button on the Multi Extension Air for at least 5 seconds to put the Multi Extension Air in learn mode – see the picture below. Once in the learn mode the status LEDs will flash red-green-yellow.

Multi Extension Air Learn Button

To learn in your air devices please click here.



The digital inputs can be used as a frequency counter inputs. You can for example connect pulse meters for electricity, gas or water flow. Please note however that the counted pulses are transmitted once per minute meaning the Multi Extension Air inputs are not suitable for the connection of wind sensors. You need to use an Extension for this purpose.


The Multi Extension Air has four PWM outputs that can be used for RGBW lighting, as 4 individual dimmed channels, as well as 4 PWM outputs which have variable frequency. You can set the type of use in the properties of the Multi Extension Air (select the extension in the Periphery Tree). These outputs work in the same way the the RGBW 24V Dimmer Air works.

The voltage to the PWM outputs is from 12 to 24VDC, please remember that the maximum power must be halved if using 12VDC. The maximum power is 50W per channel, if higher power is required the channels can be bridged. Please note that there is no internal connection between the supply voltage of the extension and the +24V output at the PWM outputs.

Multi Extension Air PWM Properties

RGBW dimming

This is for driving RGBW LED strips. Choosing this type will show two actuators in the periphery tree:

  • Dimmer RGB
  • Dimmer W (White)

Individual dimming channels:

This is for driving single colour LED strips or other loads. Choosing this type will show 4 separate dimming channels in the periphery tree:

  • PWM 1 / Dimmer 1
  • PWM 2 / Dimmer 2
  • PWM 3 / Dimmer 3
  • PWM 4 / Dimmer 4

PWM control signal:

This is not intended for driving loads but to provide a PWM control signal at a configurable frequency. This option will give you 4 individually controllable actuators in the Periphery Tree. The frequency of the PWM in Hz may be specified in the properties of the Multi Extension Air.

  • PWM 1 / Dimmer 1
  • PWM 2 / Dimmer 2
  • PWM 3 / Dimmer 3
  • PWM 4 / Dimmer 4

PWM Control Signal

How the PWM outputs work:

The value of the outputs are controlled using pulse width modulation. This means for example that to get a value of 80% the output will be on for 80% of the period and off for 20% of the period.

The graph below shows the waveforms for an output value of 10%, 50% and 90% respectively:

PWM Graph

Powering PWM outputs:

Separate power supply for the extension and LEDs:
We recommend that you use a separate power supply to power your LEDs. You can see how to connect this in the diagram below, please note that the maximum current is 2.1A per channel (50W at 24VDC).

Power Multi Extension Air Separate PSU

Same power supply for the extension and the LEDs:
For your LEDs, you can use the same power supply as for the extension. However, the power supply must be of the correct rating for the amount of tape and the extension. You can see how to connect this in the diagram below, please note that the maximum current is 2.1A per channel (50W at 24VDC).

Power Multi Extension Air Same PSU

12VDC power supply for the extension and LEDs:
You can use a separate 12V power supply instead of 24V if you have lower voltage LEDs. Please note however that the maximum current will now be 2.1A per channel (25W at 12VDC). You can see how to connect this in the diagram below.

Power Multi Extension Air 12V PSU


The Multi Extension Air has a full 1-Wire interface. This has the same technical properties as the 1-Wire extension, so a maximum of 20 temperature sensors can be used with the interface, and limitless iButtons.

See here for more information on 1-Wire:


Contact us

Find out how to setup your Air Base Extension.

Find out more about our Air technology!


Quick start guide (pdf) 

Extension EG Declaration of Conformity (pdf)

IEC CB Test Certificate (pdf)