Você deve seguir as instruções incluídas no dispositivo.
Connect wire "C" of the RPLS530A/RPLS531A to the "common" wire, identified when removing the old switch. Connect the other two RPLS530A/RPLS531A wires to the two remaining wires.
At the other 3-way switch, connect the jumper wire between the "common" screw and the screw where wire "1" of the RPLS530A/RPLS531A is connected.
Assim, seu diagrama ficará assim ...