AIAS RC Techsheet IMO

14 / 26 | AIAS Room controller - installation and operation instruction
Presence detection depending on the CO2 concentration
This function is not active when the controller is congured for Heating/Cooling with VAV¬control.
When the CO2 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 hystere-
sis (FS=160ppm). When the concentration drops below this value, the controller will remain in presence mode for the duration of the
congured 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 diffe-
rence 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.
Features for RC
0...10 V input
The 0...10 V input used as a CO2 input for RC supports a general 0...10 V signal. This input is not connected to any function but only
acts as a read-out for the signal. To congure this option, parameter 81 is set to option 7, “0...10 V”.
Flow input
AI2 may be congured as a ow calculation input. A ow corresponding to 0 V and one corresponding to 10 V is set, and the ow is
then calculated linearly between these two end points. To congure the ow calculation, Parameter 81 has the additional option 8,
“Flow calculation”.
The calculated ow value may be shown in the display by setting parameter 42 to option 9.