Programming hints
Whether you do not need one of the macro inputs, connect them to the value specified in the next table.
Inputs |
When not used set to: |
SupplyAirTemp |
|
SupplyAirTempSp |
|
HVAC_Mode |
4 |
ContrPtAdj |
0 |
FilteredOATemp |
15 |
CO2_Sensor |
0 |
FanEnable |
1 |
EnRecSeqSwitch |
0 |
PlantMode |
4 |
HumidityMode |
0 |
Fan speed
We do not recommend to control the fan speed depending not the supply air temperature control deviation, since this would disturb the temperature control significantly.
The fan speed control or command outputs shall be used only in case of CO2 control.
The fan speed can be changed via
CO2 application tip:
Sometimes, the air quality device is an active controller with its own proportional band and setpoint, providing an output signal from 0...1 Volt or 0...10 Volt between a certain span, e.g. between 800...1000 ppm. This signal has to be converted into a 0...100 % signal in order to connect it to the input CO2_Sensor. When the device measures an air quality, equal to the minimum value, input signal will be 0%. If air quality goes bad, up to the maximum value, the signal will raise up to 100%.
Important: To disable the internal CO2 the user can