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9-8. HOW TO CHECK THE COMPONENTS
<Thermistor feature chart>
Low temperature thermistors
• Thermistor <Outdoor pipe> (TH3)
• Thermistor <Low pressure saturated temperature> (TH6)
• Thermistor <Outdoor> (TH7)
Thermistor R0 = 15k' ±3%
B constant = 3480 ± 2%
R
t =15exp{3480(
273+t
–
273
)}
0: 15k'
10: 9.6k'
20: 6.3k'
25: 5.2k'
30: 4.3k'
40: 3.0k'
1
1
Thermistor R120 = 7.465k' ±2%
B constant = 4057 ± 2%
R
t =7.465exp{4057(
273+t
–
393
)}
1
1
20: 250k'
30: 160k'
40: 104k'
50: 70k'
60: 48k'
70: 34k'
80: 24k'
90: 17.5k'
100: 13.0k'
110: 9.8k'
High temperature thermistor
• Thermistor <Discharge> (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")
0.5
2.5 5
2.5
4.5
Vout (V)
PRESSURE
(MPa)
3
2
1
WHT
BLU
BLK
SENSOR
5V DC
GND
63HS
Vout
MICRO
COMPUTER
MULTI
CONTROLLER BOARD
3-1 : 5V (DC)
2-1 : Output Vout (DC)
<HIGH PRESSURE SENSOR>
0: 180k'
25: 50k'
50: 17k'
70: 8k'
90: 4k'
Thermistor R50 = 17k' ±2%
B constant = 4170 ± 3%
R
t =17exp{4170(
273+t
–
323
)}
1
1
Medium temperature thermistor
Heatsink temperature thermistor (TH8)
200
150
100
50
0
25 50 75 100 110 125:
Temperature
Resistance (k")
OC376B--2.qxp 08.1.17 1:15 PM Page 60