Top And Bottom Air Blow System - Hitachi RAF-25NH4 Service Manual

ODEL RAF-25NH4, RAF-50NH4

1. Top and Bottom Air Blow System

During heating, this air conditioner blows warm air from the bottom as well as from the top outlet as in previous
models.
When the fan speed is set to "HI" or "AUTO" for cooling, the air conditioner blows cool air from both top and
bottom, which allows rapid cooling. (This top / bottom cool air blow is possible for up to 25 minutes with the fan
speed set to AUTO or HI.
blow only.)
(1) AIR OUTLET SWITCH
AIR OUTLET SWITCH IS SET TO
COOLING OPERATION
¥
If cooling is started at an AUTO or HI fan speed
setting, and if a considerable difference is present
between the room temperature and preset
temperature, the damper inside of the bottom air
outlet will automatically open to allow cold air to
also be directed out of the bottom side air outlet.
When the room temperature reaches the preset temperature or after approximately 30 minutes have elapsed from
starting operation, cold air will automatically be directed only from the top side air outlet.
¥
When it is desirable to direct cold air from the bottom side air outlet for a longer period of time, set the temperature
at 16 ¡C and fan speed at HIGH. When the room temperature is more than 8¡C above the preset temperature (16¡
cold air will continuously blow from the bottom side air outlet.
DEHUMIDIFYING OPERATION
¥ For more efficient dehumidifying, the bottom side air outlet will remain closed.
FAN OPERATION
¥ Air blows out only from top side air outlet.
AIR OUTLET SWITCH IS SET TO
¥ Air blows out only from top side air outlet in both heating and cooling operation.
¥ Air can be blown only from top side air outlet, to prevent blowing air striking your face during sleep, etc.
¥
If air blows out only from the top side air outlet, it takes more time to reach the set temperature when compared to
air blowing from both top and bottom side air outlets. Also, temperature distribution within the room may be adversely
affected. It is therefore recommended to use both top and bottom side air outlets whenever possible.
When the set room temperature is reached, the unit automatically switches to top
TE PORARY SWITCH
AIR OUTLET SWITCH
TE PORARY SWITCH
AIR OUTLET SWITCH
HEATING OPERATION
¥ As operation starts, warm air is automatically discharged
from top and bottom side air outlets.
¥ When the room temperature reaches the preset
temperature, air is directed only from top side air outlet at
the LOW fan speed.
36
C),