Thermistor; Thermistors For Ras-3Hvrc2 - Hitachi UTOPIA RAS-4HVRP2E Service Manual

8 Electrical checks of main parts

Thermistor

8.2 Thermistor

8.2.1 Thermistors for RAS-3HVRC2


Thermistor for discharge gas temperature (THM9)
For prevention of discharge gas overheating

Thermistor for outdoor ambient temperature (THM7)
165 SMGB0136 rev.0 - 07/2021
Thermistor for
discharge gas
temperature
(THM9)
Thermistor for
evaporating
temperature
(THM8)
Thermistor for
condensing
temperature
(THM10)
Thermistor resistance characteristics
Temperature (ºC)
Thermistor resistance characteristics
80
78.0
70
60
58.3
50
44.0
40
33.7
30
26.0
20.2
20
10
0
-15 -10 -5 0 5 10 15
Ambient temperature (ºC)
Thermistor for outdoor
ambient temperature
(THM7)
72.3
49.9
35.1
25.1
18.7 13.4
9.93
7,47 5,76
15.9
12.6
10.0
8.05
6.52
5.31
4.36
3.60 2.99
20 25 30 35 40 45 50 55
2.49
60
8