Mitsubishi Electric MS-18NV Service Manual page 11

(4) The initial set temperature is decided by the initial room temperature.
Mode
COOL mode of
"I FEEL CONTROL"
DRY mode of
"I FEEL CONTROL"
w 1 When the system is restarted with the remote controller, the system operates with the previous set temperature
regardless of the room temperature at restart.
The set temperature is calculated by the previous set temperature.
(5) TEMPERATURES buttons
In "I FEEL CONTROL" (
In addition, set temperature can be controlled by TOO WARM or TOO COOL buttons when you feel too cool or too warm.
Each time the TOO WARM or TOO COOL button is pressed, the indoor unit receives the signal and 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
cool. 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(°C)
TOO
WARM ... To lower the set temperature 1~2 degrees(°C)
— COOL mode of "I FEEL CONTROL" —
1. Indoor fan speed control
Indoor fan operates at the set speed by FAN SPEED CONTROL button.
In Auto the fan speed is as follows.
Room temperature minus set temperature : 2 degrees or more········································Hi
Room temperature minus set temperature : Between 1 and 2 degrees····························Me
Room temperature minus set temperature : less than 1 degree······································· Lo
2. Coil frost prevention
1 Temperature control
When the indoor coil thermistor RT12 reads -1°C or below, the coil frost prevention mode starts immediately.
However, the coil frost prevention doesn't work after 5 minutes since the compressor has started.
Indoor fan operates at the set speed and the compressor stops for 5 minutes.
After that, if RT12still reads below -1°C this mode is prolonged until the RT12 reads over -1°C.
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 Lo or Me.
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 Hi or the room temperature exceeds
26°C. However, when two of the above conditions (b.and c.) are satisfied again.Time accumulation is resumed.
Initial room temperature
26: or more
25: to 26:
more than13:, less than 25:
) mode, set temperature is decided by the microprocessor based on the room temperature.
Initial temperature difference
Initial room temperature
minus 2:
Initial room temperature
minus 2:
11
Initial set temperature
24:
Difference between room
temperature and set
Fan speed
temperature during
2 deg. 4 deg.
1 deg. 1.7 deg.
w1