Bosch BCC100 User Manual page 26

Unit Operating Mode
Heat: Unit will be cycled to maintain scheduled heating
set-point.
Cool: Unit will be cycled to maintain scheduled cooling set-point.
Auto: Unit will be automatically switched between heating
and cooling operations to maintain heat/cool set-points.
Off: All heating and cooling functions are turned off. The
fan can still operate in this mode if manually activated.
Emergency Heat (only available on Heat Pumps): Will turn
off all compressors and turn on backup electric heat source.
Fan Operation
Auto: Fan will follow heating
and cooling operations.
On: Fan runs non-stop.
Circulation: Fan cycles on and
off regularly in addition to heating and cooling operations.
By selecting this option, you also need to define the
operation length of time and schedule for the circulation.
If the G wire was substituted for the C wire during
installation, the Fan-On & Circulation options will
not function.
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