Mitsubishi Electric M Series Manual page 200

WALL-MOUNTED MSC/MS/MSH Series
f. AUTO VANE OPERATION
To confirm the standard position, the vane moves until it touches the vane stopper. Then the vane is set to the desired angle.
In FAN operation
The horizontal vane position is set to Upward.
C-198
in the following case:
<MU>
<MUH>
VANE CONTROL or VANE
VANE CONTROL or VANE
<MUH>
CONTROL or VANE
M series