29
9-6. TROUBLE CRITERION OF MAIN PARTS
Room temperature
thermistor
(TH1)
Condenser/evaporator
temperature thermistor
(TH5)
Measure the resistance with a tester.
(Part temperature 10
°
C ~ 30
°
C)
Pipe temperature
thermistor/liquid
(TH2)
Check method and criterion
Part name
Normal
4.3k
Ω
~9.6k
Ω
Abnormal
Opened or short-circuited
9-7. Thermistor
0
10
20
30
40
50
-20 -10
0
10 20 30 40 50
< Thermistor for lower temperature >
Temperature (
:
)
Resistance (K
"
)
<Thermistor Characteristic graph>
Room temperature thermistor (TH1)
Pipe temperature thermistor (TH2)
Condenser/evaporator temperature
thermistor (TH5)
Thermistor R
0
=15k
"
± 3%
Fixed number of B=3480k
"
± 2%
Rt=15exp { 3480( ) }
0
:
15k
"
10
:
9.6k
"
20
:
6.3k
"
25
:
5.2k
"
30
:
4.3k
"
40
:
3.0k
"
Thermistor for
lower temperature
1
273+t
1
273
HWE17030.qxd 17.11.9 16:28 Page 29
