Table of Contents
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Thermistor resistance values
Room temperature thermistor
Temp °F(°C)
Resistance k
32.00
(0.00)
33.62
41.00
(5.00)
25.93
50.00
(10.00)
20.18
59.00
(15.00)
15.84
68.00
(20.00)
12.54
77.00
(25.00)
10.00
86.00
(30.00)
8.04
95.00
(35.00)
6.51
104.00
(40.00)
5.30
113.00
(45.00)
4.35
122.00
(50.00)
3.59
131.00
(55.00)
2.98
140.00
(60.00)
2.47
149.00
(65.00)
2.09
158.00
(70.00)
1.76
167.00
(75.00)
1.49
176.00
(80.00)
1.27
185.00
(85.00)
1.09
194.00
(90.00)
0.93
203.00
(95.00)
0.81
212.00
(100.00)
0.70
Discharge thermistor
Temp °F(°C)
Resistance k
32.00
(0.00)
175.70
41.00
(5.00)
134.93
50.00
(10.00)
104.59
59.00
(15.00)
81.79
68.00
(20.00)
64.50
77.00
(25.00)
51.27
86.00
(30.00)
41.07
95.00
(35.00)
33.13
104.00
(40.00)
26.91
113.00
(45.00)
22.01
122.00
(50.00)
18.10
131.00
(55.00)
14.98
140.00
(60.00)
12.47
149.00
(65.00)
10.44
158.00
(70.00)
8.78
167.00
(75.00)
7.42
176.00
(80.00)
6.31
185.00
(85.00)
5.38
194.00
(90.00)
4.61
203.00
(95.00)
3.97
212.00
(100.00)
3.43
221.00 (105.00)
2.98
230.00 (110.00)
2.59
239.00 (115.00)
2.26
248.00 (120.00)
1.99
Characteristics of discharge thermistor
180.00
160.00
140.00
120.00
100.00
80.00
60.00
40.00
20.00
0.00
32
68
104
140
(0)
(20)
(40)
(60)
Temperature °F(°C)
Indoor heat exchanger thermistor
Voltage (V)
Temp °F(°C)
1.15
32.00
(0.00)
1.39
41.00
(5.00)
1.66
50.00
(10.00)
1.94
59.00
(15.00)
2.22
68.00
(20.00)
2.50
77.00
(25.00)
2.77
86.00
(30.00)
3.03
95.00
(35.00)
3.27
104.00
(40.00)
3.48
113.00
(45.00)
3.68
122.00
(50.00)
3.85
131.00
(55.00)
4.00
140.00
(60.00)
4.14
149.00
(65.00)
4.25
158.00
(70.00)
4.35
167.00
(75.00)
4.44
176.00
(80.00)
4.51
185.00
(85.00)
4.57
194.00
(90.00)
4.63
203.00
(95.00)
4.67
212.00
(100.00)
Outdoor heat exchanger thermistor
Voltage (V)
Temp °F(°C)
0.18
-4.00 (-20.00)
0.24
5.00 (-15.00)
0.30
14.00 (-10.00)
0.31
23.00
(-5.00)
0.38
32.00
(0.00)
0.47
41.00
(5.00)
0.70
50.00
(10.00)
0.84
59.00
(15.00)
0.99
68.00
(20.00)
1.16
77.00
(25.00)
1.34
86.00
(30.00)
1.54
95.00
(35.00)
1.74
104.00
(40.00)
1.95
113.00
(45.00)
2.16
122.00
(50.00)
2.36
131.00
(55.00)
2.57
140.00
(60.00)
2.76
149.00
(65.00)
2.95
158.00
(70.00)
3.13
167.00
(75.00)
3.30
176.00
(80.00)
3.45
185.00
(85.00)
3.60
194.00
(90.00)
3.73
203.00
(95.00)
3.85
212.00
(100.00)
Characteristics of heat exchanger thermistor (Outdoor)
50.00
40.00
30.00
20.00
10.00
0.00
176
212
248
-4
(80)
(100)
(120)
(-20)
Resistance k
Voltage (V)
176.03
1.10
134.23
1.36
103.34
1.63
80.28
1.92
62.91
2.21
49.70
2.51
39.57
2.79
31.74
3.06
25.64
3.30
20.85
3.53
17.06
3.73
14.10
3.90
11.64
4.55
9.69
4.19
8.12
4.30
6.83
4.40
5.78
4.48
4.91
4.55
4.19
4.61
3.59
4.66
3.09
4.71
Resistance k
Voltage (V)
49.20
2.66
36.58
3.02
27.51
3.35
20.91
3.64
16.05
3.89
12.44
4.09
9.73
4.26
7.67
4.40
6.10
4.51
4.89
4.60
3.95
4.67
3.21
4.73
2.62
4.78
2.16
4.81
1.79
4.85
1.49
4.87
1.25
4.89
1.05
4.91
0.89
4.92
0.76
4.93
0.65
4.94
0.56
4.95
0.48
4.96
0.41
4.96
0.36
4.97
32
68
104
140
176
(0)
(20)
(40)
(60)
(80)
Temperature °F(°C)
08-06
Characteristics of room temperature thermistor
40.00
35.00
30.00
25.00
20.00
15.00
10.00
5.00
0.00
32
50
68
86
(0)
(10)
(20)
(30)
Temperature °F(°C)
Characteristics of heat exchanger thermistor (Indoor)
180.00
160.00
140.00
120.00
100.00
80.00
60.00
40.00
20.00
0.00
32
68
104
(0)
(20)
(40)
Temperature °F(°C)
Outdoor temperature thermistor
Temp °F(°C)
Resistance k
-4.00 (-20.00)
115.24
5.00 (-15.00)
84.21
14.00 (-10.00)
62.28
23.00
(-5.00)
46.58
32.00
(0.00)
35.21
41.00
(5.00)
26.88
50.00
(10.00)
20.72
59.00
(15.00)
16.12
68.00
(20.00)
12.64
77.00
(25.00)
10.00
86.00
(30.00)
7.97
95.00
(35.00)
6.40
104.00
(40.00)
5.18
113.00
(45.00)
4.21
122.00
(50.00)
3.45
131.00
(55.00)
2.85
140.00
(60.00)
2.36
149.00
(65.00)
1.97
158.00
(70.00)
1.65
167.00
(75.00)
1.39
176.00
(80.00)
1.18
185.00
(85.00)
1.00
194.00
(90.00)
0.85
203.00
(95.00)
0.73
212.00
(100.00)
0.63
Characteristics of outdoor temperature thermistor
120.00
100.00
80.00
60.00
40.00
20.00
0.00
-4
32
(-20)
(0)
Temperature °F(°C)
104
122
140
(40)
(50)
(60)
140
176
(60)
(80)
Voltage (V)
1.25
1.56
1.90
2.26
2.61
2.94
3.25
3.52
3.76
3.97
4.14
4.28
4.41
4.51
4.59
4.65
4.71
4.76
4.79
4.83
4.85
4.87
4.89
4.91
4.92
68
104
140
(20)
(40)
(60)
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Troubleshooting
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