64
OCH439M
9-5. HOW TO CHECK THE COMPONENTS
<Thermistor feature chart>
Low temperature thermistors
• Thermistor <Liquid> (TH3)
• Thermistor <Plate Hex liquid> (TH6)
• Thermistor <Ambient> (TH7)
• Thermistor <Suction> (TH33 for HW112,140)
Thermistor R0 = 15 k
"
± 3%
B constant = 3480 ± 2%
R
t
=15exp{3480( 273+t – 273 )}
1
Thermistor R50 = 17 k
"
± 2%
B constant = 4150 ± 3%
R
t
=17exp{4150( 273+t – 323)}
1
Thermistor R120 = 7.465k
"
± 2%
B constant = 4057 ± 2%
R
t
=7.465exp{4057( 273+t – 393)}
1
1
Medium temperature thermistor
• Thermistor <Heat sink> (TH8)
High temperature thermistors
• Thermistor <Discharge> (TH4)
• Thermistor <Comp. surface> (TH33 for W50VHA(R1–R3), W85VHAR1)
• Thermistor <Comp. surface> (TH34 for HW
•
HA2R3–R7)
0
10
20
30
40
50
-20 -10 0 10 20 30 40 50
Temperature (
:
)
Resistance (k
"
)
200
150
100
50
0
25
50
75
100
125
Temperature (
:
)
Resistance (k
"
)
500
400
300
200
100
0
25
50
75
100
120
Temperature (
:
)
Resistance (k
"
)
1
1
0
:
15 kΩ
10
:
9.6 kΩ
20
:
6.3 kΩ
25
:
5.2 kΩ
30
:
4.3 kΩ
40
:
3.0 kΩ
0
:
180 kΩ
25
:
50 kΩ
50
:
17 kΩ
70
:
8 kΩ
90
:
4 kΩ
20
:
250 kΩ
30
:
160 kΩ
40
:
104 kΩ
50
:
70 kΩ
60
:
48 kΩ
70
:
34 kΩ
80
:
24 kΩ
90
:
17.5 kΩ
100
:
13.0 kΩ
110
:
9.8 kΩ
