Outdoor sensor decides how hot the boiler runs. The colder outside the hotter the water. There are setings for heating curve, like room offset and heating intensity aka slope. By defaulte slope is 1.0 and offset is 3°C and you get like 20c water at 20c outside and 50c water at -10c outside. If you want to increase only heating in colder weather you increase slope to like 1.2 or 1.5 Every 0.1 in slope is like 5°C hotter watter at -10 outside. For fine adjustment of room temp you change offset that is constant despite outdoor temp. I must admit they complicated it, like all users are engineers. But in reality with chart its simple. Here is the chart It also decides to start or stop heating completely.
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