Service manual

Main Functions SiBE05-722_C
28 Function and Control
<Heating>
In heating operation, the fan speed is regulated according to the indoor heat exchanger
temperature and the difference between the room thermistor temperature and the target
temperature.
Note: 1. During POWERFUL operation, the fan rotates at H tap + 50 rpm.
2. The fan stops during defrost control.
1.5 Program Dry Operation
Outline 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.
Detail 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.
Room thermistor
temperature at start-up
Target temperature
X
Thermostat OFF point
Y
Thermostat ON point
Z
24ºC or more
Room thermistor
temperature at start-up
X
–
2.5ºC
X
–
0.5ºC
or
Y + 0.5ºC (zone B)
continues for 10 min.
23.5ºC
X
–
2.0ºC
X
–
0.5ºC
or
Y + 0.5ºC (zone B)
continues for 10 min.
~
18ºC
18ºC X
–
2.0ºC
X
–
0.5ºC = 17.5ºC
or
Y + 0.5ºC (zone B)
continues for 10 min.
17.5ºC
~
Zone A = Thermostat OFF
Y
+0.5ºC
Z
X
Zone B
Zone B
Zone C = Thermostat ON
(R11581)