![Hitachi RAC-30CH6 Скачать руководство пользователя страница 49](http://html.mh-extra.com/html/hitachi/rac-30ch6/rac-30ch6_service-manual_139678049.webp)
– 53 –
8. Room Temperature Thermistor Circuit
●
Fig. 8-1 shows the room temperature
thermistor circuit.
0V
Room
temperature
thermistor
0V
5V
Fig. 8-1
A
R309
C302
Micro
computer
Room
temp. input
R310
0V
0V
Heat exchanger
temperature thermistor
0V
5V
Fig. 9-1
A
R307
C301
Micro computer
Heat
exchanger
temperature
input
R308
R304
Q301
5
4
3
2
1
0
0
10
Fig. 8-2
20
30
40
V
oltage at
(V)
A
5
4
3
2
1
0
0
10
-10
Fig. 9-2
20
30
40
V
oltage at
(V)
A
64
63
9. Heat exchanger temperature thermistor circuit
●
The voltage at
A
depends on the room
temperature as shown in Fig. 8-2.
●
The circuit detects the indoor heat
exchanger temperature and controls
the following.
(1) Low-temperature defrosting during
cooling and dehumidifying
operation.
The voltage at
A
depends on the heat
exchanger temperature as shown in
Fig. 9-2.
0301E (30CH6) pg 47-68
16/12/05, 2:49 PM
53