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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
R406
R403
A
0V
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 exchanger thermistor is controlled.
According to heat exchanger temperature, the voltage of point
5V
Heat exchanger
thermistor
R407
R402
A
0V
Fig. 9-1
5V
Temporary
switch
SW211
0V
Fig. 7-1
Microcomputer
Room
90
temperature input
C404
0V
Microcomputer
Heat exchanger
91
input
C403
0V
MICROCOMPUTER
R405
TEMPORARY SW
100
0V
becomes as it is shown in Fig.8-2.
becomes as it is shown in Fig. 9-2.
- 56 -
5
4
3
2
1
0
0
10
20
30
Room temperature
(
)
Fig. 8-2
5
4
3
2
1
0
0
10 20 30 40
-10
Heat temperature (
)
Fig. 9-2
40
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