Hitachi RAS-10C9 Instruction Manual page 9

Explanation of the sleep timer
The device will control the FAN SPEED and room temperature automatically
so as to be quiet and good for people's health.
You can set the sleep timer to turn off after 1, 2, 3 or 7 hours. The FAN
SPEED and room temperature will be controlled as shown below.
Operation with the sleep timer
Function
The FAN SPEED will be set to
Cooling
LOW immediately.
" "
and
dehumidifying
" "
Fan
The settings of room temperature and circulation are not varied.
" "
Operation
Sleep
timer set
1 hour
– 9 –
6 hours
later
7 hours later
2 hours
later
3 hours later