AIAS RC Techsheet IMO
10 / 26 | AIAS Room controller - installation and operation instruction
To avoid Y2 and Y3 opening and closing frequently during switch-over, a saddle point is implemented. Y2 will output 0...10 V (line-
ar) when the controller output is 0...48 % and Y3 will output 0...10 V (linear) when the controller output is 52...100 %. In the saddle
point, the outputs will always be 100 % for Y2 and 0 % for Y3.
As an addition to the function described above, it is possible to connect a CO2 sensor to controller. The output on Y3 will then be
affected by either cooling demand or by the CO2 level rising too high. The output from the CO2 function is linear between two user-
dened setpoints (see gure below).
The variable for the min. limit of the VAV-damper is the same as for the VAV-damper in the VAV control applications on Y2.
Default is 20 % min. limit.
Reversed sequence
In some applications, e.g. free cooling, it may be desirable to reverse the sequence of Y2 and Y3 (i.e., to open Y3 before Y2). This
function is a conguration of the control mode Heating/Cooling/VAV. When the function is active, the sequence of Y2 and Y3 will be
reversed, i.e. Y3 will open 0...100 % when controller output is in the range of 0...48 % and Y2 will open 0...100 % when the controller
output is 52...100 %. See the gure below: