Service manual

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2. Indoor fan speed control
(1) Indoor fan operates at the set speed by FAN SPEED CONTROL button.
In Auto the fan speed is as follows.
Set temperature minus room temperature: 2 : or more ·················································· High
Set temperature minus room temperature: Between 1 and 2 : ···································· Med.
Set temperature minus room temperature: less than 1
:················································· Low
1 :
1.7 :
2 :
4 :
Initial temperature difference
Fan speed
Difference between room
temperature and set tem-
perature during operation
(2) Cold air prevention control
1 When the compressor is not operating,
(1) if the temperature of room temperature thermistor RT11 is 15°C or less, or RT12 is less than 18°C,
the fan stops.
(2) if the temperature of room temperature thermistor RT11 is more than 15°C, or RT12 is more than 18°C,
the fan operates at Very Low.
2 When the compressor is operating,
(1) if the temperature of RT12 is 18°C or more, the fan operates at set speed.
(2) if the temperature of RT12 is less than 18°C and
(1) if heating operation starts after defrosting, the fan stops.
(2) if the temperature of room temperature thermistor RT11 is 15°C or less, the fan stops.
(3) if the temperature of room temperature thermistor RT11 is more than 15°C, the fan operates at Very Low.
NOTE : When 3 minutes have passed since the compressor started operation, this control is released regardless of the
temperature of RT11 and RT12.
1.7 :
2.0 :
Set temperature
Difference between room
temperature and set tem-
perature during operation
1. Thermostat control
Thermostat is ON or OFF by difference between room temperature and set temperature.
Initial temperature difference Thermostat
Room temperature minus set temperature : less than 2.0 :··············································ON
Room temperature minus set temperature : 2.0 : or more················································OFF
2-15. HEAT ( ) OPERATION
(1) Press OPERATE/STOP(ON/OFF) button.
OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone.
(2) Select HEAT mode with OPERATION SELECT button.
(3) Press TEMPERATURE buttons (TOO WARM or TOO COOL button) to select the desired temperature.
The setting range is 16 ~ 31°C.
2. Indoor fan speed control
Indoor fan operates at the set speed by FAN SPEED CONTROL button.
When thermostat OFF (compressor OFF) fan speed becomes Very Low.
3. Coil frost prevention
Coil frost prevention is as same as COOL mode. (2-13.3.)
The indoor fan maintains the actual speed of the moment. However, when coil frost prevention works while the compressor
is not operating it’s speed becomes the set speed.
4. Low outside temperature operation
Low outside temperature operation is as same as COOL mode. (2-13.4.)
-1.0 :
-0.7 :
1. Thermostat control
Thermostat is ON or OFF by difference between room temperature and set temperature.
Initial temperature difference Thermostat
Room temperature minus set temperature : -1.0 : or more··············································ON
Room temperature minus set temperature : less than -1.0 :············································OFF
Set temperature
Difference between room
temperature and set tem-
perature during operation
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