Underfloor heating - how to wire between distrubutor thermal strip and thermostat

rafael.wlotzka

Hello,

i want to replace an old room thermostat with the Netatmo Thermostat and use the Relay with the power plug adapter (wired setup).

We have a underfloor heating with an heating circuit distributor per floor.
Every room on the floor has it own wired thermostat, which is connected to a floor-central terminal strip.
Inside this terminal strip also the thermoelectric actuators inside the distributor cabinet are connected to the terminal strip.

Unfortunatly the cable coming from the distributor to the old thermostat has three strings, one for L, one for N and one string to shortcut the L string regarding the circuit schema.

There are no COM / NO cables, which can be identified.

The actuator from the heating circuit distributor is from PRINETO.

The gas condensing boiler (heater) itself is WOLF CGB-2, which is compatible regarding https://check.netatmo.com, but this is only useful, if we would connect one netatmo Thermostat to the  Boiler. We prefer to install one thermostat and  relay per room, so every single room can be controlled itself.

Wiring diagram of the current wired thermostat

current wiring of the wired thermostat

data sheet of the old room thermostat

distributor cabinet with terminal strip

terminal strip diagram

Each room thermostat is wired to this terminal Strip for (example for row R1):

L (brown) -> pin 1 on the old room thermostat
N (blue) -> pin 4 on the old room thermostat
R1 (black -> Pin 2 on the old room thermostat)

M -> to the actuator

So my main problem is, that there are three wires at the old thermostat and i do not know, which ones are to be used with the netatmo thermostat.

Please help me with the wiring.

Best regards

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  • Comment author
    rafael.wlotzka

    The official netatmo support replied to the subject:

    Your existing thermostat is connected to your valve with 3 wires.
    Our Thermostat, however, can only be connected to 2 wires maximum.
     
    To replace your thermostat, you will need to adapt your installation by adding an additional relay between the Netatmo Thermostat and your valve.
     
    Please find below a diagram explaining the connections, but I strongly suggest that you seek advice from a professional to select and install correctly this relay, if you intend going ahead.

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