103
OCH675E
8-8. HOW TO CHECK THE COMPONENTS
<Thermistor feature chart>
Low temperature thermistors
• Thermistor <HIC pipe> (TH2)
• Thermistor <Outdoor liquid pipe> (TH3)
• Thermistor <Suction pipe> (TH6)
• Thermistor <Ambient> (TH7)
0°C
15 kΩ
10°C 9.6 kΩ
20°C 6.3 kΩ
25°C 5.2 kΩ
30°C
4.3 kΩ
40°C
3.0 kΩ
Thermistor R0 = 15 kΩ ± 3 %
B constant = 3480 ± 1 %
R
t
=15exp{3480(
273+t – 273 )}
1
1
Thermistor R120 = 7.465 kΩ ± 2 %
B constant = 4057 ± 2 %
R
t
=7.465exp{4057(
273+t – 393)}
1
1
20°C 250 kΩ
30°C 160 kΩ
40°C 104 kΩ
50°C
70 kΩ
60°C
48 kΩ
70°C
34 kΩ
80°C
24 kΩ
90°C
17.5 kΩ
100°C
13.0 kΩ
110°C
9.8 kΩ
High temperature thermistor
• Thermistor <Compressor> (TH4)
0
10
20
30
40
50
-20 -10 0 10 20 30 40 50
Temperature (
:
)
Resistance (k
"
)
500
400
300
200
100
0
25
50
75
100
120
Temperature (
:
)
Resistance (k
"
)
0°C
180 kΩ
25°C
50 kΩ
50°C
17 kΩ
70°C
8 kΩ
90°C
4 kΩ
Thermistor R50 = 17 kΩ
± 2 %
B constant = 4150 ± 3 %
R
t
=17exp{4150(
273+t – 323)}
1
1
Medium temperature thermistor
• Thermistor <Heat sink> (TH8)
200
150
100
50
0
25
50
75 100 110 125
(
:
)
Temperature
Resistance (k
"
)
