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The wired thermostat TADO replaces a Carrefour thermostat in a Ferrol boiler

Boiler: Ferroli DOMIproject F 24
Thermostat: Carrefour type:997651
Only two wires named 1 and 3.

In which ports of the TADO thermostat should I insert the cables called 1 and 2 by the carrefour thermostat?

Thanks