page 10
Figure 9: Example of AHU controller interaction with MIXIT when configured with the heating coil application.
4.3.1.1
The build in frost protection function
In Figure 9 MIXIT detects frost by the build in frost detection function. It could also be signaled from the
AHU control to MIXIT to go into FROST state. This is done by setting frost risk (BACnet: BO,4/Modbus
00101.7). In that case MIXIT sets frost risk detected (BACnet: BI,7=1/Modbus 00204.4=1) as would happen
when frost was detected by the build in frost detection function.
