Hey Stefano,
the Vitotrol 200 only works on Vitotronic 200 and the Vitotronic 200 system only operates with an outside temperature sensor. With Vitotronic 100 you have no chance to use this.
So you have Vitotronic 100 or 200?
Vitosolic 100 connected via the plug 145 (KM-Bus). You need a cable made of copper 0,75mm²
kind regards °pa
Viele Grüße
Patrick vom Customer-Care-Team