Mitsubishi Electric MSZ-A09RV-E1 Service Manual page 25

5. TEMPERATURES buttons
In "I FEEL CONTROL" (h)mode, set temperature is decided by the microprocessor based on the room temperature.
In addition, set temperature is controlled by TOO WARM or TOO COOL buttons when you feel too cool or too warm.
Pressing the TOO WARM or TOO COOL button emits a beep tone.
Fuzzy control
When the TOO COOL or TOO WARM button is pressed, the microprocessor changes the set temperature, considering
the room temperature, the frequency of pressing TOO COOL or TOO WARM button and the user's preference to heat or
cold. So this is called "Fuzzy control", and works only in "I FEEL CONTROL" mode.
In DRY mode of "I FEEL CONTROL", the set temperature doesn't change.
TOO
COOL ... To raise the set temperature 1 ~ 2 degrees (: )
TOO
WARM ... To lower the set temperature 1 ~ 2 degrees (:)
— Cool mode of "I FEEL CONTROL" —
1. Followings are the fan speed in AUTO.
Room temperature minus set temperature: 2 degrees or moreover ··························Hi
Room temperature minus set temperature:
Room temperature minus set temperature: less than 1 degree ·································Lo
2. Time control
When the three conditions below have been satisfied for 1 hour and 45 minutes, compressor stops for 3 minutes.
(1).Compressor has been continuously operating.
(2).Indoor fan speed is Lo or Me
(3).Room temperature is below 26:.
When compressor turns off half way,.the accumulated time is cancelled.
When compressor turns on again, time counting starts from the beginning.
When the indoor fan speed becomes Hi or the room temperature exceeds 26:, timecounting stops temporarily.
After, when the above conditions are satisfied again, time counting restarts.
The indoor fan operates at set speed.
3. Coil frost prevention mode
The operational frequency of the compressor is controlled based on the temperature of the indoor coil thermistor(RT12).
Temperature of indoor coil thermistor:Th
approx. 8°C or above
approx. 6°C to 8°C
approx. 3°C to 6°C
approx. 3°C or below
• The indoor fan maintains the actual speed of the moment.
—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 temperature and the microprocessor.
By such controls, indoor flow amounts will be reduced in order to lower humidity without much room temperature
decrease.
The operation of the compressor and indoor fan is as follows.
Compressor operates by temperature control and time control.
1 Set temperature is controlled to fall 2°C as initial set temperature.
2 Indoor fan and outdoor fan operate in the same cycle as the compressor.
3 Operational frequency control of compressor is fixed 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" .
Temperature difference
1 degree or more and less than 2 degrees
lower at the rate of 3Hz/min
lower at the rate of 6Hz/min
Compressor is turned OFF for 5 minutes when left temperature
continues for 5 minutes or more.
25
Difference between room
temperature and set
Fan speed
temperature during operation.
··········Me
Operation frequency
normal
fixed
4 deg.
2 deg.
1 deg. 1.5 deg.