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6. Initial Setting Circuit (IC401)
When power is supplied, the microcomputer reads the data in IC401 (E
activation value and the rating and maximum speed of the compressor, etc. to their initial values.
Data of self-diagnosis mode is stored in IC401; data will not be erased even when power is turned off.
1
2
3
4
2
IC401 (E
PROM)
0V
7. Temporary Switch Circuit
The temporary switch is used to operate the air conditioner temporarily when the wireless remote control
is lost or faulty.
The air conditioner operates in the previous mode at the previously set temperature. However, when the
power switch is set to OFF, it starts automatic operation.
8. Room Temperature Thermistor Circuit
A room temperature thermistor circuit is shown in Fig. 8-1.
According to room temperature, the voltage of point
5V
Room Temperature
Thermistor
R305
R301
⃝ A
Fig. 8-1
9. Heat Exchanger Thermistor Circuit
Heat exchanger temperature is noticed inside the room
(1) Preheating
(2) Low-temperature defrosts at cooling and dehumidification operation time.
(3) Not working of reversing valve or detection of opening of heat exchange thermistor is controlled.
According to heat exchange temperature, the voltage of point
5V
Heat exchanger
thermistor
R306
R302
⃝ A
0V
Fig. 9-1
5V
5V
8
C401
7
0V
0V
6
5
5V
Temporary
switch
SW211
0V
Fig. 7-1
Microcomputer
Room
90
temperature input
C302
Microcomputer
Heat exchanger
91
input
C303
0V
2
PROM) and sets the preheating
5V
82
81
Fig. 6-1
TEMPORARY SW
R629
54
MICROCOMPUTER
0V
becomes as it is shown in Fig.8-2.
becomes as it is shown in Fig. 9-2.
56
Microcomputer
SCL
}
External ROM
SDA
5
4
3
2
1
0
0
10
20
30
40
Room temperature
(℃ )
Fig. 8-2
5
4
3
2
1
0
-10
0
10 20 30 40
Heat temperature (
)
℃
Fig. 9-2
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