Making Vaillant Boiler Smart

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21

Hi, can you tell me more about the wiring process and the list of entity/data that you are able to collect?

22

I attached it directly to my VR71 as there the eBus connector was easily accessable. And just attached a short KNX cable to it to my v5 https://ebusd.eu/

The list of entities dependsā€¦

VR700 data
bai data
VR71 data

In full I have 489 entities.

For example some VR700 entities:
image

FYI: Iā€™m running ebusd as a docker image. And connect ebusd with HASSIO via MQTT.

23

Ok thank you so much.

I donā€™t have the VR71 so I should connect the ebus board directly to the VR700, I supposeā€¦

Do you have the possibility to change and control parameters or are they just reading?

24

You can adapt ebusd/contrib/etc/ebusd/mqtt-hassio.cfg at 029aa27676f87a6c5b58bfb3f8630788c1cd881d Ā· john30/ebusd Ā· GitHub to make HASSIO also writable - by default itā€™s read-only. See lines 118-122

25

Yes, I was also enable to manual heatup the boiler. Finally :slight_smile: the other settings are changeable as well but iam not changing them regularly (iam not using thermostats nor outdoor sensors anymore. Just the delta between input and output)

26

I have updated my climate config due to all the changes from the past (ebusd and HomeAssistant)ā€¦ now it works again.

Edit: Another update, ive moved all resources to github for easier updating them and added some missing informatioins

27

Hi dMopp,

Very interesting. I also have an Ecotec plus boiler and I want to do something similar. I do not have VCR700, just a dry contact relay that commands the bolier at 24V, controlled by HA (when any of the flloor heating valves request heat).

I want to connect the ebus adapter to get data (other nerd here :slight_smile: ) but also to replace the 24V relay if possible. Do you know how CMD of the boiler is done via ebus? I think you command the VCR700 not the boiler directly through ebus.

I would also like to know how modulating capabillties can be controlled from ebusd.

Thanks
CĆ©sar

28

I am also still installing, so could be wrong, but I believe they are all (boiler, VCR and ebus-rpi) on the same 2 ebus wires. Also, boiler and VCR will ā€˜absorbā€™ whatever commands/changes you issue from HA, and vice-versa. I am assuming this because of what I read here Connected Vaillant to Home Assistant ā€“ Floris Romeijn , down in the comments of 23jan2021 he states
I can set the temperature from two places, with my Home Assistant or with the my thermostat (VRT350). Changes by HA is reflected on the display on my thermostat.
Hope this helps.

29

Hereā€™s your translated text:

Hi everyone,

I just canā€™t get it to work.
Iā€™m at the point where my Vaillant boiler is successfully being read via MQTT.
I also (at least I think so) can send values to the boiler. However, it doesnā€™t seem to work.

My devices:

  • Vaillant ecoTEC VCW 206 5-5
  • calorMATIC 350
  • eBUS Adapter Shield C6
  • HomematicIP Temperature and Humidity Sensor ā€“ outdoor

My problem is that I want to send the temperature data from the Homematic sensor to the boiler.
Below is my automation for this. Iā€™m probably doing something wrong.

gastherme.yaml:
automation:

  • alias: ā€œSend HomeMatic outdoor temperature to Vaillantā€
    trigger:
    • platform: state
      entity_id: sensor.luft_und_feuchtigkeitsmesser_temperatur
      action:
    • service: mqtt.publish
      data:
      topic: ā€œebusd/bai/OutdoorstempSensorā€
      payload: >
      {ā€œtempā€: {ā€œvalueā€: {{ states(ā€˜sensor.luft_und_feuchtigkeitsmesser_temperaturā€™) | string }}}
      retain: true

It seems to me that I somehow need to tell the boiler that there is an external temperature sensor,  
since Vaillant offers its own product for this, which I would rather not purchase if possible.