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(4) Flow soft control
After the thermostat turns off, the indoor fan operates at Very Low.
NOTE : When the thermostat turns on, the fan operates at the set speed. Due to the cold air prevention control, the fan
does not start at set speed until the indoor coil thermistor RT12 reads 72°F or more.
<Time condition> <Indoor fan speed>
less than 2 minutes ························Low
2 minutes to 4 minutes···················Med.
4 minutes or more ··························High
The upper limit of the fan speed is the set speed.
If the thermostat turns off, this operation changes to flow soft control.
8-1-3. HEAT mode of “I FEEL CONTROL”
1. Indoor fan speed control
(1) In AUTO the fan speed is as follows.
Set temperature minus room temperature: 4 degrees or more················································· High
Set temperature minus room temperature: Between 2 and 4 degrees ····································· Med.
Set temperature minus room temperature: less than 2 degree················································· Low
(2) Cold air prevention control
The fan runs at set speed when the indoor coil thermistor RT12 temperature exceeds 72°F. The fan operates Low when
the temperature of indoor coil thermistor RT12 is below 64°F. But the fan stops when the indoor fan operates at Very
Low and the room temperature is 59°F or less.
NOTE : If the temperature of RT12 reads from 64°F to 72°F at the air conditioner starting and also after defrosting, this
control works.
(3) Warm air control.
When compressor starts in heating operation or after defrosting, the fan changes the speed due to the indoor coil ther-
mistor RT12 temperature to blow out warm air.
After releasing of cold air prevention, when the indoor coil thermistor RT12 temperature is 99°F or above, the fan speed
shifts to the set speed, and when the fan speed is changed by the remote controller, the fan speed is the set speed.
When the indoor coil thermistor RT12 temperature is less than 99°F, the fan speed is controlled by time as below.
Difference between room
temperature and set temperature
during operation
2deg.
3deg.
7deg.
4deg.
Initial temperature difference
Fan speed
Indoor coil thermistor
RT12 temperature
Released
Cold Air Prevention
64F
-
72F
-
Fan speed
Set speed
Very Low or stop
NOTE : During the high pressure protection and for 10 seconds after high pressure protection, defrosting of outdoor heat
exchanger is not detected by the defrost thermistor RT61.
3. Discharge temperature protection
Discharge temperature protection is as same as during COOL mode of “I FEEL CONTROL”.
• Compressor
When the temperature of indoor coil thermistor RT12 goes to 167°F or more, the compressor is turned OFF.
3 minutes after the compressor is turned OFF and if the temperature of indoor coil thermistor RT12 becomes 167°F or
less, the compressor is turned ON.
2. High pressure protection
During heating operation, the outdoor fan and the compressor are controlled by the temperature of indoor coil thermistor
RT12 for excess rise protection of compressor discharge pressure.
• Outdoor fan
When the temperature of indoor coil thermistor RT12 goes to 131°F or more, the outdoor fan is turned OFF.
When the temperature of indoor coil thermistor RT12 becomes to 126°F or less, the outdoor fan is turned ON.
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