I’m currently integrating a Vent-Axia Sentinel Econiq MVHR unit with Home Assistant and thought I’d share some information that might help others looking to do the same.
Unlike the older Sentinel Kinetic units that people have been reverse-engineering, the Econiq appears to support Modbus RTU over the BMS RS485 port .
Vent-Axia technical support kindly provided the communication parameters and register map for the Econiq/Apex platform.
30014 – Supply fan RPM
30015 – Supply airflow (l/s)
30016 – Extract fan RPM
30017 – Extract airflow (l/s)
30010 – System power (W)
30100 – Intake duct temperature (°C ×10)
30110 – Supply duct temperature (°C ×10)
30120 – Extract duct temperature (°C ×10)
30130 – Exhaust duct temperature (°C ×10)
30101 – Intake RH (%)
30121 – Extract RH (%)
30200 – Zone temperature
30201 – Zone RH
30202 – Zone CO₂
Control registers
40030 – User override / boost command
Example: 0x030F = Boost mode for 15 minutes
40021 – Bypass override
0 = auto
1 = open
2 = closed
Hardware connection
The BMS port uses RS485. Pins normally used are:
3 – Modbus A
4 – Modbus B
5 – GND
6 – Shield
I’m planning to connect this to Home Assistant using a USB-RS485 adapter and the Modbus integration.
If anyone else is running an Econiq or Apex system and interested in collaborating on a proper Home Assistant integration or ESPHome component, it would be great to compare notes.
I don’t have your device, just a comment here. If you use USB adapter and connect it directly to HA, the work flow is completely different than esphome approach.
Ah this is awesome. I’m thinking I could use a waveshare modbus to Ethernet adaptor - same as I’ve done with my solar inverter. Have you managed to get this connected and into home assistant already @Faisy ?
I’ve managed to get it into homeassistant partially. Need to add all the sensors still.
I’ve managed to get control of the manual override for presets along with a duration.
I’ve just seen on HACs someone has done a custom integration for a Komfovent mvhr, I think something similar should be done for vent axia if possible taking inspiration from the komfovent custom integration.
Did you manage to create a working integration in the end?
I’ve been looking through the user manual and noticed that it mentions the possibility of configuring virtual inputs, which can then be controlled via holding registers. However, I couldn’t find where these virtual inputs are actually set up in the mobile app.
Have you by any chance figured this out? Any guidance would be much appreciated.
Hi, @Faisy, I have a Sentinel Econiq LC and have done a minimal integration that displays all the status info. I did it back in January one evening - it works but it’s probably not very pretty - regardless I’m happy to share what I have.
I’m also happy to work on improving the integration though I’m no HA expert, but always willing to learn.
