40
Chapter 7
Control modes
Regio Midi manual
Presence detection depending on the CO
2
concentration
This function is not active when the controller is configured for Heating/Cooling with VAV-
control.
When the CO
2
concentration exceeds the set value for activation of presence, UO3 will switch
to forced ventilation if the presence operating mode is set to Bypass. It will stay there until the
concentration drops below the set value (FS=800ppm) minus the hysteresis (FS=160ppm).
When the concentration drops below this value, the controller will remain in presence mode
for the duration of the configured occupancy off-delay (FS=10min).
Minimum limit for the heating output
In some applications, it is desirable to set a minimum limit for the heating output in order to
prevent, for instance, downdraughts under windows. In general, this function works in a way
similar to the minimum limit for the cooling output. However, there is a difference between
the minimum limit for the heating and cooling output as the minimum limit for the latter still
remains active after the controller enters heating mode. In addition, the minimum limitation
for the heating output functions in all control modes.
