This parameter sets which fan speed is set, or may not be over/undershot, when forced operation is
active.
3, 2, 1, OFF: All states are possible.
Unchanged: The state is retained.
OFF: Off
1: Limited to speed 1.*
1, OFF: limited to speed 1 and off.
2: Limited to speed 2.*
2, 1: limited to speeds 2 and 1.
2, 1, OFF: limited to speed 2, 1 and off.
3: Limited to speed 3.*
3, 2: limited to speeds 3 and 2.
3, 2, 1: limited to speeds 3, 2 and 1.
* The control value is ignored.
This function defines fan speed ranges (limitations) which may not be over/undershot.