Service manual

15
6-4. How to check the parts PAC-SF29LB
6-4-1. Thermistor
Parts name
Liquid pipe thermistor (TH22)
Gas pipe thermistor (TH23)
Disconnect the connector then measure the resistance using a tester.
(Surrounding temperature 10
°
C-30
°
C)
Check points
(Refer to the thermistor)
Normal
4.3k"-9.6k"
Abnormal
Open or short
<Thermistor Characteristic graph>
Thermistor for
lower temperature
Thermistor R0 = 15k" i 3%
B constant = 3480k" i 1%
0°C
10°C
20°C
25°C
Rt = 15exp {3480( )}
Liquid pipe thermistor (TH22)
Gas pipe temperature thermistor (TH23)
273+t 273
11
15k"
9.6k"
6.3k"
5.2k"
30°C
40°C
4.3k"
3.0k"
0
10
20
30
40
50
-20 -10 0 10 20 30 40 50
Temperature (:)
Resistance (K")
OC296--1.qxp 03.6.11 9:37 AM Page 15