Time Control; Indoor Fan Speed Control - Mitsubishi Electric MSZ-G09SV Service Manual

2 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 below 26°C.
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.
Operation chart
Example
Compressor
Outdoor fan
Indoor fan
9-14-2. 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.
1 Set temperature is controlled to fall 2°C from initial room 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 84Hz.
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".
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.
4. Outdoor fan control
Outdoor fan control is as same as during COOL mode of "I FEEL CONTROL".
9-14-3. 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 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
The fan runs at set speed when the indoor coil thermistor RT12 temperature exceeds 22°C. The fan operates at Very
Low when the temperature of indoor coil thermistor RT12 is below 18°C. But the fan stops when the indoor fan operates
at Very Low and the temperature is 15°C or less.
Indoor coil thermistor
RT12 temperature
NOTE : If the temperature of RT12 reads from 18°C to 22°C at the air conditioner starting and also after defrosting, this
control works.
ON
OFF
(continuously at set speed)
ON
Initial temperature difference
Released
Cold Air Prevention
18: 22:
50
ON
OFF
Fan speed
Fan speed
Set speed
Very Low or stop
Difference between room tem-
perature and set temperature
during operation
deg.
2 deg.
4
deg.
1 deg.
1.7