﻿In automatic operation, the command value of the controller is used internally in the device for automatic control of the fan levels. As a transition between the levels, there are threshold values, defined according to the command value of the controller, which can be set here. If the command value reaches the threshold value of a level during an increase of the command value, the appropriate level is activated. If the command value reaches below a threshold value, minus the configured hysteresis, during a reduction of the command value, then the switchover takes place into the next lowest fan level.
