Mitsubishi PUY-A24NHA6 - Component Check Methods

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ThermistorR0=15k"±3%
Bconstant=3480±2%
t(:):Rt=15exp{3480(
273+t
–
273
)}
T(˚F):R
T=15exp{3480(
273+(T–32)/1.8
–
273
)}
10-7. HOW TO CHECK THE COMPONENTS
<Thermistor feature chart>
Low temperature thermistors
•Thermistor<Liquid>(TH3)
•Thermistor<2-phasepipe>(TH6)
•Thermistor<Ambient>(TH7)
•Thermistor<Suction>(TH33)
32˚F[0:] 15k"
50˚F[10:] 9.6k"
68˚F[20:] 6.3k"
77˚F[25:] 5.2k"
86˚F[30:] 4.3k"
104˚F[40:] 3.0k"
1
1
ThermistorR120=7.465k"±2%
Bconstant=4057±2%
t(:):Rt=7.465exp{4057(
273+t
–
393
)}
T(˚F):R
T=7.465exp{4057(
273+(T–32)/1.8
–
393
)}
1
1
68˚F[20:] 250k"
86˚F[30:] 160k"
104˚F[40:] 104k"
122˚F[50:] 70k"
140˚F[60:] 48k"
158˚F[70:] 34k"
176˚F[80:] 24k"
194˚F[90:] 17.5k"
212˚F[100:] 13.0k"
230˚F[110:] 9.8k"
High temperature thermistor
•Thermistor<Comp.surface>(TH32)
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")
32˚F[0:] 180k"
77˚F[25:] 50k"
122˚F[50:] 17k"
158˚F[70:] 8k"
194˚F[90:] 4k"
ThermistorR50=17k"±2%
Bconstant=4170±3%
t(:):Rt=17exp{4170(
273+t
–
323
)}
T(˚F):R
T=17exp{4170(
273+(T–32)/1.8
–
323
)}
1
1
Medium temperature thermistor
•Thermistor<Heatsink>(TH8)
200
150
100
50
0
25 50 75 100 110 125
77 122 167 212 230 257
:
°F
Temperature
Resistance (k")
1 1
1 1
1 1
OCH577A