Hi, as a next step, I’m trying to integrate non-smart systems, like ventilation, into OH. The ventilation unit is a Wolf CWL 300 Excellent . Additional to the control unit on top of the unit, a second control unit, called BM-2 , is installed. As far as I understood the manual correctly, then the BM-2…

[image] BananaBender: Con: The BM-2 is already connected via eBUS (I’m not sure, if this is a problem) It’s a shared bus, so you can connect multiple devices to it.

[image] Mephix: If you’re planning on using OpenTherm, the OpenTherm Gateway binding has support for heat recovery and ventilation units. Thank you for the information. The wolf manual says, that it possible to continuously adjust the fan speed via OpenTherm (very good!). The only question fo…

The OpenTherm Gateway binding works with the OpenTherm Gateway designed by Schelte Bron. Schematics and part list can be found on his website if you want to assemble it yourself. There are also pre-built modules available like this one .

Please note that it seems that your ventilation unit is either eBus or Opentherm and not both at the same time. There is one connector on top. The BM-2 control module is specific eBus and not Opentherm. So if you want Opentherm, you probably also need another controller to control your ventilation i…

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Possibilities to integrate Wolf ventilation unit CWL 300

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Mephix (Arjen Korevaar) April 28, 2021, 6:08am 3

If you’re planning on using OpenTherm, the OpenTherm Gateway binding has support for heat recovery and ventilation units.