Hitachi RAS-25WX8 Manuel De Maintenance page 74
3. Room Temperature Thermistor Circuit
A room temperature thermistor circuit is shown in Fig. 3-1.
According to room temperature, the voltage of point
5V
Room Temperature
Thermistor
? A
4. Heat Exchanger Thermistor Circuit
Heat exchanger temperature is noticed inside the room
(1) Preheating
(2) Low-temperature defrosts at cooling 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
? A
0V
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R305
64
R301
C302
Fig. 3-1
Microcomputer
R306
Heat exchanger
63
input
R302
C303
0V
Fig. 4-1
manuals search engine
becomes as it is shown in Fig.3-2.
Microcomputer
Room
temperature input
becomes as it is shown in Fig. 4-2.
5
4
3
2
1
0
– 73 –
5
4
3
2
1
0
0
10
20
Room temperature
Fig. 3-2
0
-10
10
30
20
Room temperature (
)
Fig. 4-2
30
40
( )
40
