I wanted to control the speed settings of my decentralized LUNOS heat recovery ventilation (HRV) fans, however LUNOS offers no connected or “smart” controller for interacting with the fans. I created this integration which can be paired with a pair of inexpensive smart relays that can be installed …

Hi, sorry I just saw your message. Actually I used a quite “easy and dirty” solution. I took the 12V from the 5/UNI-FT to power the Shelly (it really doesn t take much power so even the smallest Lunos Power Transformator should work fine). Then I connected one end of each shelly relais to the swi…

Sorry for the very very late response. I haven’t been on for a while. The only thing I can think of is to try to change “normally ON” to “normally OFF” or vice versa depending on your current settings.

[image] LUNOS Heat Recovery Ventilation (HRV) fan control Hardware Hi, sorry I just saw your message. Actually I used a quite “easy and dirty” solution. I took the 12V from the 5/UNI-FT to power the Shelly (it really doesn t take much power so even the smallest Lunos Pow…

I’m not aware of a way to get any output from Nexxt-E. The only control unit/protocol that communicates both ways is the KNX-module. KNX-LUNOS-CONTROL4: Ansteuerungsmodul - LUNOS Das Modul KNX-LUNOS-CONTROL4 ermöglicht die Ansteuerung der dezentralen Lüftungsgeräte mit Wärmerückgewinnun…

Hi thanks for your answer. I think it has to do with a (maybe changed) behaviour in HomeAssistant. The default fan entity behaviour seems to have different percentages (off=0,low=33,medium=50,high=100) but when I switch the lunos fan to “low” it will set the percentage to “50%” so that HomeAssistan…

Just to make sure, the unit you have connected to Lunos is not a 2 channel potential free relay? But you send percentages to the black, grey and read cables? To get Lunos to work properly you have use one of two options; 0-10V input signal or a 2 channel potential free relay. If you connect to Lun…

Hi, the Shelly Uni is a potential free relay so Im just using the given binary Inputs. I also do not send any percentages that is just the default behaviour/Illustration of HomeAssistant. So setting the Lunos Integration fan to „Low“ will Show the fan in HomeAssistant as 50% which will then be sh…

Yeah, that might be a problem… Don’t know how to help with that unfortunately

Would be awesome if someone contributed a config_flow.py for this integration to allow people to setup via the UI. I’d be happy to merge a PR.

Hi @haavhaal - I managed to set up a pair of Lunos E2’s in separate parts of the house using Zigbee 2ch Relays… So each of my E2’s has its own 2Ch relay and its own 5/UNI controller. I have set up the controllers so that one fan is connected to Fan 1 ports and the other controller has the fan conn…

LUNOS Heat Recovery Ventilation (HRV) fan control

Hardware

amaterau February 22, 2026, 12:03pm 60

I’ve been using Lunos E2 in Homeassistent for a couple of years using ESPHome and have created an external component to control the Lunos controller using a dfrobot I2C DAC.