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 is connected via eBus.
The question is now, how to get that stuff into OH. First, I’m trying to get an overview about the different possibilites and their pro’s and con’s.
Requirements:
For me it is important, that I can switch between different fan speeds and to stop the fan (e.g. during summer time, to avoid warm air from outside; if a neighbor does BBQ; etc.). Additionally it would be nice, if I can see some status information in OH
Possible Solutions:
- step resp. multi-contact switch
The manufacturer also provides the possibility to use an old-school 4-step-switch. Each step uses a defined fan-speed. Idea: This one could be (maybe?) simulated by a sonoff 4-channel smart switch.
- Pro: Very cheap solution, about 30 EUR.
- Con: No status information, just control fan speed via 4 steps. Turning the fan off is not possible (but maybe in combination with an shelly 1pm to power on/off?).
- Genuine Wolf Addon: Link Home
The Link Home or Link Home Pro addons could also be used. In my case, it is probably (?) the pro version.
- Pro: Optimal solution for Wolf products
- Con: Too expensive, the pro version about 270 EUR.
- Unkown: Turning the fan off is not possible?
- Raspberry and eBus-Coupler
As far as I understood this thread correct, then using a Rasperry with eBUSd and an eBUS coupler could this job.
- Pro: The coupler is about 130 EUR plus Raspberry (but I’ve always some spare Raspi’s here ). From the OH perspective, I could use MQTT
- Con: The BM-2 is already connected via eBUS (I’m not sure, if this is a problem).
- Unkown: Turning the fan off is not possible?
-
OpenTherm
The manual says, that there is also an OpenTherm (OT) connection interface. I found some OT entries here, but I’m not sure, if the gateways are the same for ventilation units. Are there some experiences (config, costs, features)? -
Modbus / Genuine Wolf Addon
Looks like, that there is also a Modbus interface available. Are there some experiences (config, features)?
- Pro: ?
- Con: Too expensive, about 270 EUR.
Are there some more possibilities?
Does anyone has some experiences? Pro’s and con’s?
Thank you!