Algorithm & Control
18
2.2.2 Heating Mode:
When Ts > Tr - 1.0°C (1.8°F)
•
Compressor, Indoor Fan and Outdoor Fan ON.
When Ts
≤ Tr - 1.5°C (2.7°F)
•
Compressor and Outdoor Fan OFF. Indoor Fan speed will change to Super Low.
Tr = Room Temperature
Ts = Set Temperature
When heating load is too small, and the room temperature is still rising above compressor cut off point,
compressor will stop.
Compressor Capacity
Lowest Frequency
Time
Compressor will stop
Tr - T
(2.7°F)
2.3 Dry Mode
Program dry operation removes humidity while preventing the room temperature from lowering. Since the
microcomputer controls both the temperature and airflow rate, the temperature adjustment and FAN setting
buttons are inoperable.
The microcomputer automatically sets the temperature and airflow rate. The difference between the room
thermistor temperature at start-up and the target temperature is divided into two zones. Then, the unit
operates in an appropriate capacity for each zone to maintain the temperature and humidity at a comfortable
level.
X
Z
Y
Zone C = Thermostat ON
Zone A= Thermostat OFF
Zone B
Zone B
+0.5°C (0.9°F)
Target temperature X
Thermostat OFF point Y
Thermostat ON point Z*
Setting temperature
Room thermistor temperature – X =
-2°C (3.6°F)
Room thermistor temperature – X =
-0.5°C (0.9°F)
*Thermostat turns on also when the room temperature is in the zone B for 2 minutes.