Mitsubishi MSZ-FA-VA Service Technical Manual page 57

(9) Damper operation
NOTE 1 : Be sure to turn off the air conditioner before changing the switch setting.
With this function, air comes out simultaneously from the upper and lower air outlets so that the room
can be cooled or heated effectively. This function is set using the switch behind the front grille of the
indoor unit. (This function is available in cooling and heating operation.)
1.How to set to blow out air from the upper
and lower air outlets:
Set the air outlet selection switch to
Air blows out automatically from the upper and lower air out-
lets as shown in the table below.
NOTE 2 : Set the air outlet selection switch to the end correctly. Otherwise, air outlet cannot be selected as intended.
Description of operation
The direction (opening and closing of the damper) and the volume of the airflow from the lower air
outlet are controlled automatically.
Operation
Air
flow
Upper and lower air flow
Room temperature
and set temperature
Conditions
are different.
• Be sure to keep the area around the damper of the lower air outlet free of any objects. If any objects block the normal
operation of the damper, the left operation indicator lamp may blink.
Indoor fan motor (Lower) in COOL OPERATION
Difference between room temperature and
set temperature during operation
Indoor fan motor (Lower) in HEAT OPERATION
Indoor coil thermistor temperature
• As for indoor fan motor (upper), refer to "Indoor fan speed control (3-1.2, 3-2.2, 3-3.2)" and
"INDOOR FAN MOTOR CONTROL (3-5.)".
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.
COOL
Upper air flow Upper air flow only Upper and lower air flow
Room temperature is
close to set tempera-
ture, or the air
conditioner has
operated for 1 hour.
Damper
OPEN
CLOSE
Damper
OPEN
CLOSE
2.How to set to blow out air from the upper
air outlet only:
Set the air outlet selection switch to
DRY HEAT
Air flow temperature
is high.
Difference between
room temperature and
set temperature
during operation
2: 7:
Indoor coil thermistor
temperature
35: 40:
57
.
Upper air flow
Air flow temperature
is low.
(During defrosting
operation, start of
operation, etc.)