Mitsubishi Electric PUMY-P100VHMA Technical & Service Manual page 60

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%
1
R =15exp{3480( –
t
273 )}
273+t
0: 15k' 30:
10: 9.6k' 40:
20: 6.3k'
25: 5.2k'
Medium temperature thermistor
• Heatsink temperature thermistor (TH8)
Thermistor R50 = 17k' ± 2%
B constant = 4170 ± 3%
1
R =17exp{4170( –
t
273+t 323
0: 180k'
25: 50k'
50: 17k'
70: 8k'
90: 4k'
High temperature thermistor
• Thermistor <Discharge> (TH4)
Thermistor R120 = 7.465k' ± 2%
B constant = 4057 ± 2%
1
R =7.465exp{4057(
t
273+t
20: 250k' 70:
30: 160k' 80:
40: 104k' 90:
50: 70k' 100: 13.0k'
60: 48k' 110:
<HIGH PRESSURE SENSOR>
Vout (V)
4.5
2.5
0.5
1
4.3k'
3.0k'
1
)}
1
– )}
393
34k'
24k'
17.5k'
9.8k'
PRESSURE
2.5 5
(MPa)
50
40
30
20
10
0
200
150
100
50
0
500
400
300
200
100
0
MULTI
CONTROLLER BOARD
5V DC
3
WHT
2
BLU
MICRO
Vout
COMPUTER
1
BLK
GND
63HS
60
-20 -10 0 10 20 30 40 50
Temperature ( )
25 50 75 100 110 125
Temperature
50 75 100
25
Temperature ( )
- : 5V (DC)
- : Output Vout (DC)
120