Service manual
35
<How to operate>
1 Press POWER ON/OFF button.
2 Press the a button to display “ f ”.
3 Press the i TEMP. button to set the desired temperature.
NOTE: The set temperature changes 1°C when the or
button is press one time Cooling 19 to 30°C.
Minimum 3 minutes w1
ON
Thermostat
Indoor fan
Auto vane
Compressor
ON
LOW or HIGH
Initially 10 degrees
(Changeable by remote controller setting)
LOW or HIGH
ON
ON
OFF
OFF
CLOSE CLOSE
OFF
OFF
Operation starts by
POWER button
ON.
Operation stops by
POWER button
OFF.
Room temperature
becomes equal to
set temperature.
Room temperature
rises above set
temperature.
<COOL operation time chart>
W1 Even if the room temperature rise above the set temperature during this period, the compressor will not start until this period has ended.
FILTER
CHECK MODE
TEST RUN
241
2. INDOOR UNIT CONTROL
2-1 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 room temperature is higher than set temperature.
The compressor stops when room temperature is equal to or lower than the set temperature.
3 The compressor stops in check mode or during protective functions.
4 Coil frost prevention to prevent indoor coil frost, the compressor will stop when the indoor coil thermistor (RT2) reads 1°C or
below after the compressor has been continuously operated for at least 16 minutes or more. When the indoor coil tempera-
ture rises to 10°C or above, the compressor will start after a 3-minute time delay.
NOTE : By turning OFF the dip switch SW1-5, PKH-2.5/3/4 for J1-5 on indoor controller board, the start temperature of coil
frost prevention changes 1°C to -3°C.
5 Coil frost protection
When indoor coil temperature becomes -15°C or below, coil frost protection will proceed as follows.
<Start condition>
After the compressor has been continuously operated for 3 minutes or more,and the indoor coil temperature has been -15°C
or below for 3 minutes,the coil frost protection will start.
<Coil frost protection>
Compressor stops for 6 minutes, and then restarts.
If the start condition is satisfied again during the first 10 minutes of compressor operation, both the indoor and outdoor units
stop, displaying a check code of “P8” on the remote controller.
<Termination conditions>
Coil frost protection is released when the start condition is not satisfied again during the allowance, or when the COOL
mode stops or changes to another mode.