Friedrich VRP12K, Service And Parts Manual

Page: 151 / 221

151 PB
COMPONENTS TESTING
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.
TEMP RESISTENCE (K Ohms)
RESISTANCE
TOLERANCE %
MAX F MIN MIN MAX CENTR
-25 210.889 225.548 240.224 6.50 6.51
178.952
-20
190.889 202.825 6.25 6.25
-15 151.591 161.325 171.059 6.03 6.03
-10 128.434 144.292 5.81 136.363 5.81
108.886 -5 115.340 121.794 5.60 5.60
0 92.411 97.662 102.912 5.38 5.38
5 78.541 82.812 87.083 5.16 5.16
10 66.866 70.339 73.812 4.94 4.94
15 57.039 59.864 62.688 4.72 4.72
20 48.763 51.060 53.357 4.50 4.50
25 41.786 43.654 45.523 4.28 4.28
30 35.896 37.415 38.934 4.06 4.06
31 34.832 36.290 37.747 4.02 4.02
32 33.803 35.202 36.601 3.97 3.97
33 32.808 34.150 35.492 3.93 3.93
34 31.846 33.133 34.421 3.89 3.89
35 30.916 32.151 33.386 3.84 3.84
36 30.016 31.200 32.385 3.80 3.80
37 29.144 30.281 31.418 3.75 3.75
38 28.319 29.425 30.534 3.76 3.77
39 27.486 28.532 29.579 3.67 3.67
40 26.697 27.701 28.704 3.62 3.62
45 23.116 23.931 24.745 3.40 3.40
50 20.071 20.731 21.391 3.18 3.18
55 17.474 18.008 18.542 2.96 2.96
60 15.253 15.684 16.115 2.75 2.75
65 13.351 13.697 14.043 2.53 2.53
66 13.004 13.335 13.666 2.48 2.48
67 12.668 12.984 13.301 2.44 2.44
68 12.341 12.644 12.947 2.39 2.39
69 12.024 12.313 12.603 2.35 2.35
70 11.716 11.993 12.269 2.31 2.31
71 11.418 11.682 11.946 2.26 2.26
72 11.128 11.380 11.633 2.22 2.22
73 10.846 11.088 11.329 2.18 2.18
74 10.574 10.804 11.034 2.13 2.13
75 10.308 10.528 10.748 2.09 2.09
76 10.051 10.260 10.469 2.04 2.04
77 9.800 10.000 10.200 2.00 2.00
78 9.550 9.748 9.945 2.03 2.03
79 9.306 9.503 9.699 2.07 2.07
80 9.070 9.265 9.459 2.10 2.10
81 8.841 9.033 9.226 2.13 2.13
82 8.618 8.809 9.000 2.17 2.17
83 8.402 8.591 8.780 2.20 2.20
84 8.192 8.379 8.566 2.23 2.23
85 7.987 8.172 8.358 2.27 2.27
86 7.789 7.972 8.155 2.30 2.30
87 7.596 7.778 7.959 2.33 2.33
88 7.409 7.589 7.768 2.37 2.37
89 7.227 7.405 7.583 2.40 2.40
90 7.050 7.226 7.402 2.43 2.43
91 6.878 7.052 7.226 2.47 2.47
92 6.711 6.883 7.055 2.50 2.50
93 6.548 6.889 6.718 2.53 2.53
94 6.558 6.390 6.727 2.57 2.57
95 6.237 6.403 6.569 2.60 2.60
96 6.087 6.252 6.417 2.63 2.63
97 5.942 6.105 6.268 2.67 2.67
98 5.800 5.961 6.122 2.70 2.70
99 5.663 5.822 5.981 2.73 2.73
100 5.529 5.686 5.844 2.77 2.77
105 4.912 5.060 5.208 2.93 2.93
110 4.371 4.511 4.651 3.10 3.10
3.898 115 4.030 4.161 3.27 3.27
120 3.482 3.730 3.606 3.43 3.43
Figure 630 (Thermistor Values)