LG PRCKD20E Owner's Manual page 16

Reservation function of wired remote controller
16 AHU CONTROL KIT
7 Press button to move to 'Minute'
setting mode. (the 'Minute' segment will
flash)
8 Setting Minute value by pressing
button.
9 Press button to finish.
10
In the process, press
button to release and exit
from setting mode.
(In case of exit with
incomplete information, it will
return to the previous setting )