Dry Operation; Heat Operation - Mitsubishi Electric MS-A WA Service Technical Manual

2-2. DRY ( ) OPERATION
Set temperature is as shown on the right chart.
The system for dry operation uses the same refrigerant circuit as the
cooling circuit.
The compressor and the indoor fan are controlled by the room tem-
perature.
By such controls, indoor flow amounts will be reduced in order to
lower humidity without much room temperature decrease.
1. Thermostat control
Thermostat turns ON or OFF by the difference between room temperature
and set temperature.
Thermostat
2. Indoor fan speed control
Indoor fan operates at the set speed by FAN SPEED CONTROL button.
When the thermostat turns OFF (compressor OFF), fan speed becomes Very Low.
In AUTO the fan speed is as follows.
3. Coil frost prevention
Coil frost prevention is as same as COOL mode. (2-1.3.)
The indoor fan maintains the actual speed of the moment. However, when coil frost prevention works while the compressor
is not operating, its speed becomes the set speed.
4. Low outside temperature operation
Low outside temperature operation is as same as COOL mode. (2-1.4.)
2-3. HEAT ( ) OPERATION (MSZ)
1. Thermostat control
Thermostat turns ON or OFF by difference between room temperature and set temperature.
(MSZ-FE18 MSZ-GE24)
Thermostat
(Other models)
Thermostat
2. Indoor fan speed control
(1) Indoor fan operates at the set speed by FAN SPEED CONTROL button.
In Auto the fan speed is as follows.
Fan speed
ON
OFF
Fan speed
High
Med.
Low
Room temperature minus
set temperature (Initial)
ON
OFF
Room temperature minus
set temperature (Initial)
ON
OFF
High
Med.
Low
Room temperature minus
set temperature (Initial)
-3.6°F(-2°C) or more
less than -3.6°F(-2°C)
Room temperature minus
set temperature (Initial)
3.15°F(1.75°C) or more
between 1.8 and 3.15°F
less than 1.8°F(1°C)
less than 1.8°F(1°C)
1.8°F(1°C) or more
less than 3.6°F(2°C)
3.6°F(2°C) or more
Set temperature minus
room temperature (Initial)
3.6°F(2°C) or more
Between 0.45 and 3.6°F
Less than 0.45°F(0.25°C)
8
Set temperature and
initial room temperature in dry mode
95(35)
86(30)
77(25)
68(20)
59(15)
50(10)
50 59 68 77 86
(10) (15) (20) (25) (30)
Initial room temperature [°F(°C)]
Room temperature minus
set temperature (During operation)
-3.6°F
(-2°C)
(-0.75°C)
Room temperature minus
set temperature (During operation)
4.5°F
(2.5°C)
3.15°F
1.8°F
(1.75°C)
(1°C)
Room temperature minus
set temperature (During operation)
1.35°F 1.8°F
(0.75°C) (1°C)
Room temperature minus
set temperature (During operation)
3.15°F 3.6°F
(1.75°C) (2°C)
Set temperature minus room
temperature (During operation)
3.6°F
(2°C)
0.45°F 3.15°F
(0.25°C)
(1.75°C)
95
(35)
-1.35°F
7.2°F
(4°C)