Mitsubishi Electric MSC-CA20VB Service Technical Manual page 29

3-1-2. DRY mode of "I FEEL CONTROL"
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 temperature.
By such controls, indoor flow amounts will be reduced in order to lower humidity without much room temperature decrease.
1. Indoor fan speed control
Indoor fan operates at the set speed by FAN SPEED CONTROL button.
However, in AUTO fan operation, fan speed becomes Low.
2. The operation of the compressor and indoor/ outdoor fan
Compressor operates by room temperature control and time control.
Set temperature is controlled to fall 2°C from initial room temperature.
Indoor fan and outdoor fan operate in the same cycle as the compressor.
•When the room temperature is 23°C or over:
When the thermostat is ON, the compressor repeats 8 minutes ON and 3 minutes OFF.
When the thermostat is OFF, the compressor repeats 4 minutes OFF and 1 minute ON.
•When the room temperature is under 23°C.
When the thermostat is ON, the compressor repeats 2 minutes ON and 3 minutes OFF.
When the thermostat is OFF, the compressor repeats 4 minutes OFF and 1 minute ON.
Operation time chart
Example
OFF
Thermostat
OFF
Indoor fan
OFF
Outdoor fan
Compressor
3. Coil frost prevention
• The operation is as same as coil frost prevention during COOL mode of "I FEEL CONTROL".
• Indoor fan operates at the set speed and the compressor stops for 5 minutes, because protection(Coil frost
prevention) has the priority.
However, when coil frost prevention works while the compressor is not operating, its speed becomes Low.
4. Outdoor fan speed control <MUH-GA80VB>
Outdoor fan speed is as same as one of COOL mode of "I FEEL CONTROL".
3-1-3. HEAT mode of "I FEEL CONTROL"
1. Indoor fan speed control
(1) In AUTO the fan speed is as follows.
Set temperature minus room temperature: 2 : or more ·························································· High
Set temperature minus room temperature: Between 1 and 2 : ·············································· Med.
Set temperature minus room temperature: less than 1: ························································· Low
ON
ON
ON
OFF
ON
ON
OFF
8 minutes
3 minutes
Initial temperature difference
OFF
ON
OFF
ON
OFF
4 minutes 1 minute
29
ON
Difference between room
temperature and set temperature
Fan speed during operation
1°C 1.7°C
2°C
4°C