4
2. Indoor fan speed control
Indoor fan operates at the set speed by FAN SPEED CONTROL button.
In AUTO the fan speed is as follows.
Initial temperature difference
Fan Speed
Room temperature minus set temperature: 1.7°C or more ························································ High
Room temperature minus set temperature: between 1 and 1.7°C ·············································Med.
Room temperature minus set temperature: less than 1°C ························································· Low
1°C
1.7°C
3°C
3. Coil frost prevention
Temperature control
The coil frost prevention mode in the temperature control is that the indoor fan operates at the set speed and the com-
pressor stops for 5 minutes or more.
Model
Coil frost prevention
ON
OFF
Indoor coil thermistor (°C)
Indoor coil thermistor (°C)
MSC-GE20VB
MSC-GE25VB
4 °C or less
More than 4 °C
MSC-GE35VB
0 °C or less
More than 0 °C
MS-GD80VB
-1 °C or less
More than -1 °C
MS-GE50VB
3 °C or less
More than 3 °C
MSH-GD80VB
MSH-GE50VB
1 °C or less
More than 1 °C
The coil frost prevention does not work for 5 minutes after the compressor started.
Compressor
Outdoor fan
OFF
ON
(Continuously at set speed)
Indoor fan
ON
ON
OFF
Operation chart
Example
5. Discharge temperature protection (MU-GD80VB, MUH-GD80VB)
The compressor is controlled by the temperature of discharge temperature thermistor for excess rise protection of compres-
sor discharge pressure.
• Compressor
When the temperature of discharge temperature thermistor goes to 120°C or more, the compressor is turned OFF. After 3
minutes since the compressor has been turned OFF, if the temperature of discharge temperature thermistor becomes 100
°C or less, the compressor is turned ON.
4. Outdoor fan speed control (MU-GD80VB, MUH-GD80VB)
Outdoor fan speed control is as follows.
Outdoor
fan speed
High
or
Med.
Indoor
fan speed
20°C 22°C
Low
30°C 33°C
High
Temperature of
ambient temperature
thermistor
Low
High
Low
1-1. COOL ( ) OPERATION
1
MSC/MS/MSH MICROPROCESSOR CONTROL
Time control
When the three conditions as follows have been satisfied for 1 hour and 45 minutes, compressor stops for 3 minutes.
a. Compressor has been continuously operating.
b. Indoor fan speed is Low or Med.
c. Room temperature is 26°C or less.
When compressor stops, the accumulated time is cancelled and when compressor restarts, time counting starts from the
beginning.
Time counting also stops temporarily when the indoor fan speed becomes High or the room temperature exceeds 26°C.
However, when two of the above conditions (b. and c.) are satisfied again, time accumulation is resumed.
-0.3
°C
0.3
°C
1. Thermostat control (MSC-GE20/25/35VB)
Thermostat turns ON or OFF by the difference between room temperature and set temperature
Initial temperature difference
Thermostat
Room temperature minus set temperature : 0.3°C or more ················································ ON
Room temperature minus set temperature : less than -0.3°C ············································· OFF
Set temperature
Difference between room
temperature and set tem-
perature during operation
Difference between room
temperature and set tem-
perature during operation
