Appendix; Thermistor Values - Friedrich VRP Series Service & Parts Manual

Thermistor Values

All thermistors in the VRP units
have a 10k ohm Resistence at 77° F.
The chart below shows the value vs.
temperature
If the sensor reads O/L (open) or 0
OHM (short) it is a bad sensor and
should be replaced.
If the sensors OHM value equates
to a temperature that is incorrect,
i.e. room temperature is 65 ° but
the sensor reads 6 OHM (97°), then
the sensor is out of calibration and
needs to be replaced.
141

APPENDIX

TEMP RESISTENCE (K Ohms)
F MIN
-25 210.889
178.952
-20
-15 151.591
-10 128.434
-5 108.886
0 92.411
5 78.541
10 66.866
15 57.039
20 48.763
25 41.786
30 35.896
31 34.832
32 33.803
33 32.808
34 31.846
35 30.916
36 30.016
37 29.144
38 28.319
39 27.486
40 26.697
45 23.116
50 20.071
55 17.474
60 15.253
65 13.351
66 13.004
67 12.668
68 12.341
69 12.024
70 11.716
71 11.418
72 11.128
73 10.846
74 10.574
75 10.308
76 10.051
77 9.800
78 9.550
79 9.306
80 9.070
81 8.841
82 8.618
83 8.402
84 8.192
85 7.987
86 7.789
87 7.596
88 7.409
89 7.227
90 7.050
91 6.878
92 6.711
93 6.548
94 6.390
95 6.237
96 6.087
97 5.942
98 5.800
99 5.663
100 5.529
105 4.912
110 4.371
115 3.898
120 3.482
Figure 1000 (Thermistor Values)
RESISTANCE
TOLERANCE %
CENTR MAX MIN
225.548 240.224 6.50
190.889 202.825 6.25
161.325 171.059 6.03
136.363 144.292 5.81
115.340 121.794 5.60
97.662 102.912 5.38
82.812 87.083 5.16
70.339 73.812 4.94
59.864 62.688 4.72
51.060 53.357 4.50
43.654 45.523 4.28
37.415 38.934 4.06
36.290 37.747 4.02
35.202 36.601 3.97
34.150 35.492 3.93
33.133 34.421 3.89
32.151 33.386 3.84
31.200 32.385 3.80
30.281 31.418 3.75
29.425 30.534 3.76
28.532 29.579 3.67
27.701 28.704 3.62
23.931 24.745 3.40
20.731 21.391 3.18
18.008 18.542 2.96
15.684 16.115 2.75
13.697 14.043 2.53
13.335 13.666 2.48
12.984 13.301 2.44
12.644 12.947 2.39
12.313 12.603 2.35
11.993 12.269 2.31
11.682 11.946 2.26
11.380 11.633 2.22
11.088 11.329 2.18
10.804 11.034 2.13
10.528 10.748 2.09
10.260 10.469 2.04
10.000 10.200 2.00
9.748 9.945 2.03
9.503 9.699 2.07
9.265 9.459 2.10
9.033 9.226 2.13
8.809 9.000 2.17
8.591 8.780 2.20
8.379 8.566 2.23
8.172 8.358 2.27
7.972 8.155 2.30
7.778 7.959 2.33
7.589 7.768 2.37
7.405 7.583 2.40
7.226 7.402 2.43
7.052 7.226 2.47
6.883 7.055 2.50
6.718 6.889 2.53
6.558 6.727 2.57
6.403 6.569 2.60
6.252 6.417 2.63
6.105 6.268 2.67
5.961 6.122 2.70
5.822 5.981 2.73
5.686 5.844 2.77
5.060 5.208 2.93
4.511 4.651 3.10
4.030 4.161 3.27
3.606 3.730 3.43
MAX
6.51
6.25
6.03
5.81
5.60
5.38
5.16
4.94
4.72
4.50
4.28
4.06
4.02
3.97
3.93
3.89
3.84
3.80
3.75
3.77
3.67
3.62
3.40
3.18
2.96
2.75
2.53
2.48
2.44
2.39
2.35
2.31
2.26
2.22
2.18
2.13
2.09
2.04
2.00
2.03
2.07
2.10
2.13
2.17
2.20
2.23
2.27
2.30
2.33
2.37
2.40
2.43
2.47
2.50
2.53
2.57
2.60
2.63
2.67
2.70
2.73
2.77
2.93
3.10
3.27
3.43