TADO v3+ wired with Vitodens 111-W B1LF Opentherm

Cedric83

Hello,

I've just got the TADO v3+ device (wired) to replace my Honeywell Home T3. The system is currently wired on the ports T-T in Opentherm. From the doc, I know the correct configuration for TADO is "D1".

However, both wires are black! How can I know which one should be on the digital "+" et which one on "-" ? I've read somewhere that Opentherm is potential free, but i have no clue that's correct. Is there any risk for my boiler (that's a new one) if they are inverted or is it going to just "not work"?

Thanks for your advice.

Regards,

johnnyp78

Opentherm is polarity free so either connection fine.

Cedric83

I can confirm it works. Thank you!