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Thermistor R0 = 15k' ±3%
B constant = 3480 ± 2%
t (:): R
t =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 <Outdoor pipe> (TH3)
• Thermistor <Outdoor 2-phase pipe> (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'
1
1
Thermistor R120 = 7.465k' ±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
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")
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%
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 <Heatsink> (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
OCH429--2.qxp 07.11.20 9:18 AM Page 57