Mitsubishi Electric MSZ-G09SV-E1 Service Manual page 29

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 Very Low.
2. The operation of the compressor and indoor fan/ outdoor fan
Compressor operates by temperature control and time control.
1 Set temperature is controlled to fall 2°C from initial set temperature.
2 Indoor fan and outdoor fan operate in the same cycle as the compressor.
3 Operational frequency of compressor during operation is fixed to G09:45Hz / G12:30Hz.
NOTE Coil frost prevention during DRY mode of "I FEEL CONTROL"
The operation is same as coil frost prevention during COOL mode of "I FEEL CONTROL" .
2.
Coil frost prevention
The operational frequency of the compressor is controlled based on the temperature of the indoor coil thermistor (RT12).
Temperature of indoor coil thermistor:RT12
approx. 8°C or above
approx. 6°C to 8°C
approx. 4°C to 6°C
approx. 4°C or below
The indoor fan maintains the actual speed of the moment. However, when coil frost prevention works while the compressor is
not operating, it's speed becomes the set speed.
8-1-3. HEAT mode of "I FEEL CONTROL"
1. 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.
Set temperature minus room temperature: 2 degrees or more·········································· High
Set temperature minus room temperature: Between 1 and 2 degrees ·························· Med.
Set temperature minus room temperature: less than 1 degree·········································· Low
(2) Cold air prevention control
1 When the compressor is not operating,
(1) if the temperature of indoor coil thermistor RT12 is 18°C or less, the fan stops.
(2) if the temperature of indoor coil thermistor RT12 is more than 18°C, the fan operates at Very Low.
2 When the compressor is operating,
(1) if the temperature of RT12 is 22°C or more, the fan operates at set speed.
(2) if the temperature of RT12 is less than 22°C and
(1) if the temperature of room temperature thermistor RT11 is 15°C or less, the fan stops.
(2) if the temperature of room temperature thermistor RT11 is more than 15°C, the fan operates at Very Low.
Indoor coil thermistor
RT12 temperature
NOTE : If the temperature of RT12 reads from 18: to 22: at the air conditioner starting and also after defrosting, this
control works.
Initial temperature difference
Released
Cold Air Prevention
RT12 18:
Operation frequency
lower at the rate of 3Hz/min.
lower at the rate of 6Hz/min.
Compressor is turned OFF for 5 minutes when left temperature con-
tinues for 5 minutes or more.
Fan speed
Set speed
Very Low or stop
22:
29
normal
fixed
Difference between room
temperature and set tem-
Fan speed
perature during operation
1 deg. 1.7 deg.
2 deg. 4 deg.