Auto Vane Operation - Mitsubishi Electric MS-A WA Service Technical Manual

4-6. AUTO VANE OPERATION

Horizontal vane
(1) Cold air prevention in HEAT operation
When any of the following conditions occurs in HEAT operation, the vane angle changes to Vertical position automati-
cally to prevent cold air blowing on users.
Compressor is not operating.
Defrosting is performed.
Indoor coil thermistor reads 75.2°F or below.
Indoor coil thermistor temperature is raising from 75.2°F or below, but it does not exceed 102.2°F.
Indoor coil thermistor temperature
NOTE: The horizontal vane automatically moves in certain intervals to determine its position, and then it returns to the set
position.
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 (2-1.2, 2-2.2, 2-3.2)" and "INDOOR FAN MOTOR
CONTROL (2-5.)".
<SWING operation>
In swing operation of ECONO COOL operation mode, the initial airflow direction is adjusted to "Horizontal".
According to the temperature of indoor coil thermistor at starting of this operation, next downward blow time is decided.
Then when the downward blow has been finished, next horizontal blow time is decided.
For initial 10 minutes the swing operation is performed in table G~H for quick cooling.
Also, after 10 minutes when the difference of set temperature and room temperature is more than 35.6°F, the swing
operation is performed in table D~H for more cooling.
The air conditioner repeats the swing operation in various cycle as follows.
Temperature of indoor
coil thermistor (°F)
A 59 or less
B 59 to 63
C 63 to 64
D 64 to 68
E
68 to 70
F 70 to 72
G 72 to 75
H More than 75
Released
Cold Air Prevention
Difference between
room temperature and
set temperature
Damper
during operation
OPEN
CLOSE
35.6°F
(2°C)
Indoor coil thermistor
Damper
temperature
OPEN
CLOSE
95°F
(35°C)
Downward blow time (second)
2
5
8
11
14
17
20
23
38
Horizontal vane
75.2°F 102.2°F
(24°C) (39°C)
44.6°F
(7°C)
104°F
(40°C)
Horizontal blow time (second)
23
20
17
14
11
8
5
2
Set position
Vertical Position