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8
MICROPROCESSOR CONTROL
1. COOL operation
(1) Compressor control
1
3-minute time delay
To prevent overload, the compressor will not start within 3 minutes after stop.
2
The compressor runs when the room temperature is higher than the set temperature.
The compressor stops when the room temperature is equal to or lower than the set temperature.
3
The compressor stops in check mode.
(2) Indoor fan control
Indoor fan speed LOW/HIGH depends on the remote controller setting.
(3) Outdoor fan control
POWER ON/OFF with the compressor.
(4) 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 will not work for 5 minutes after the compressor starts.
During the coil frost prevention compressor stops and the indoor fan operates at the set speed for 5 minutes.
After that, if RT12 still reads or below -1°C, this mode prolonged until the RT12 reads over -1°C.
After the coil frost prevention stops, units will not enter this mode again at least 5 minutes even RT12 reads -1°C.
2
Time control
When the three conditions below 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.
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.
<How to operate>
1
Press POWER ON / OFF button.
2
Press MODE SELECT button to set operation mode to COOL.
3
Check
lamp is ON and set desired temperature with UP or DOWN but-
ton.
NOTES : 1. When
lamp is ON, press TIMER/TEMP button to change the
display to temperature mode.
2. Set temperature changes by 1°C in the range 18 ~ 29°C each time UP
or DOWN button is pressed.
3. The lighting lamp shows the set temperature, and the flashing lamp
shows the room temperature.
When the room temperature is equal to the set temperature, the lamp
keeps lighting, 0.5 seconds brightly and 0.5 seconds faintly.
TIMER
MIN. 3 minutes 1
ON
Thermostat
Indoor fan
Compressor
Outdoor fan
ON
LOW or HIGH
LOW or HIGH
ON
OFF
OFF
OFF
Operation starts by
P O W E R b u t t o n
ON.
Operation stops by
P O W E R b u t t o n
OFF.
Room temperature
becomes equal to
set temperature.
Room temperature
rises above set
temperature.
}
<COOL operation time chart>
W
1 Even if the room temperature rise above the set temperature during this period, the compressor will not start until this
period has ended.
MITSUBISHI ELECTRIC
12
11
10
9
8
7
6
5
4
3
2
1
29
28
27
26
25
24
23
22
21
20
19
18
TIMER
TEMP
TIMER/TEMP.
UP
DOWN
POWER
COOL
ON/OFF
MODE
SELECT
FAN
SPEED
TIMER
MODE
DRY
HEAT
HIGH
LOW
AUTO
STOP
START
g
TEMP
OC281-B-3.qxp 04.2.10 2:23 PM Page 72