Manual Blower Adjustment
Turning the control knob(s) clockwise increases blower output and counter clockwise decrease output. The knobs do not have limit stops and detente in stages from 1 - 14 (power is increased or decreased one level for each click). Blower output is visualized in the bar indicator in the Control Display.
Once the maximum or minimum setting is reached, turning the potentiometer further in the same direction has no additional effect and output remains at the MAX or MIN setting. The new blower value is immediately transmitted to the Control Display.
Scheme 214
Calibration Run
The stepper motors do not have a "feedback" function to recognize the actual positions, they always move to a reference position. The reference position is the flap limit positions 0% or 100%.
The flaps always move to a limit position for each "power-on reset" (reconnect battery). This allows the IHKA to start from the reference to properly position the flaps during normal operation. A calibrating run can also be initiated by the DISplus.