Mitsubishi Electric PUMY-P36NHMU, Technical & Service Manual, Page: 66 / 100

66
<Thermistor feature chart>
Low temperature thermistors
• Thermistor <Outdoor pipe> (TH3)
• Thermistor <Low pressure saturated temperature> (TH6)
• Thermistor <Outdoor> (TH7)
0
:
[32°F] 15k
'
10
:
[50°F] 9.6k
'
20
:
[68°F] 6.3k
'
25
:
[77°F] 5.2k
'
30
:
[86°F] 4.3k
'
40
:
[104°F] 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
:
[68°F] 250k
'
30
:
[86°F] 160k
'
40
:
[104°F] 104k
'
50
:
[122°F] 70k
'
60
:
[140°F] 48k
'
70
:
[158°F] 34k
'
80
:
[176°F] 24k
'
90
:
[194°F] 17.5k
'
100
:
[212°F] 13.0k
'
110
:
[230°F] 9.8k
'
High temperature thermistor
• Thermistor <Discharge> (TH4)
0
10
20
30
40
50
-20 -10 0 10 20 30 40 50
-4 -14 32 50 68 86 104122 °F
Temperature
Resistance (k
)
500
400
300
200
100
0
25 50 75 100 120
77
122 167 212 248 °F
Temperature
Resistance (k
)
t :
:
=(°F-32)/1.8
t :
:
=(°F-32)/1.8
0
:
[32°F] 180k
'
25
:
[77°F] 50k
'
50
:
[122°F] 17k
'
70
:
[158°F] 8k
'
90
:
[194°F] 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
77 122 167 212 230 257 ºF
Temperature
Resistance (k
)
t :
:
=(°F-32)/1.8
9-8. HOW TO CHECK THE COMPONENTS
0.5
2.5 5
363 725
MPa
PSIG
2.5
4.5
Vout (V)
PRESSURE
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>