Bosch FW 120 Installation And Operating Instructions Manual page 50

50 | Menu settings INSTALLER SETTINGS (contractors only)
Fig. 23 Map with the climate zones
If the location where the system is installed
cannot be found on the climate zone map
( Fig. 23):
B Do not change the factory-set value for solar
optimisation.
-or-
B Use the climate zone value that is closest to
the location where the system is installed.
6 720 800 844 (2012/02)