67
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)
0
:
15k
'
10
:
9.6k
'
20
:
6.3k
'
25
:
5.2k
'
30
:
4.3k
'
40
:
3.0k
'
Thermistor R0 = 15k
'
± 3%
B constant = 3480 ± 2%
R
t
=15exp{3480(
273+t
–
273
)}
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/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
)
0.5
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
-
: 5V (DC)
-
: 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
)
(Only VHMB)
