In our current flat we have a Danfoss CF-MC master controller for the underfloor heating. However I am never satisfied with the temperature in our rooms - either it’s too warm or too cold. Therefore I would add some shelly wifi relays to control the valves on my own. However I want still to be able to control them via the existing thermostats.
To do this I came out with the following plan.
This is the original wiring as it’s currently (Danfoss just switching the valve directly):
This is my planned wiring:
In order to be able to control via shelly as well as via the original thermostats, I came out with adding an additional relay to supply the SW input of the shelly with the output of the Danfoss.
What do you think - will this work without burning my house?
Any idea if I could save the additinal relay to connect the Danfoss output with the SW input of the Shelly?
Many thanks for your thoughts.