Mitsubishi Electric MS-09SN-C1 Service Manual page 27

When compressor stops, the accumulated time is cancelled. 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.
Operation chart
Example
OFF
Compressor
Outdoor fan
ON
Indoor fan
3. Outdoor fan speed control MU-24SN
Outdoor fan speed is controlled according to the temperature of thermostat 26F1.
Outdoor fan High operation : Until the outside temperature decrease 28.5:.
Outdoor fan Low operation : When the outside temperature decrease to 28.5:.
8-1-2. 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.
In Auto 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
Indoor fan
OFF
Outdoor fan
OFF
Compressor
3. Coil frost prevention
The operation is as same as coil frost prevention during COOL mode of "I FEEL CONTROL" operation.(Refer to 8-1-1.
COOL mode of "I FEEL CONTROL" 2.)
However when coil frost prevention works while the indoor fan is OFF, it's speed becomes set speed.
8-2. COOL ( ) OPERATION
(1) Press OPERATE/STOP(ON/OFF) button. OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone.
(2) Select COOL mode with the OPERATION SELECT button.
(3) Press TEMPERATURE buttons (TOO WARM or TOO COOL button) to select the desired temperature.
The setting range is 16 ~ 31°C.
ON
( continuously at set speed)
When the outside temperature goes to 31:.
Until the outside temperature goes to 31:.
ON
ON
ON
OFF
ON
ON
OFF
8 min. 3 min.
ON
OFF
OFF
ON
OFF
ON
OFF
4 min.
1 min.
27
Temperature of thermostat 26F1
Outdoor fan speed
High
Low
28.5:
ON
31: