Checking Temperature Sensor; Table Temperature F Vs. Resistance - Bard C24H1 Series Installation Instructions Manual

CHECKING TEMPERATURE SENSOR

OUTSIDE UNIT CIRCUIT
1. Disconnect temperature sensor from board and
from outdoor coil.
2. Use an ohmmeter and measure the resistance of the
sensor. Also use ohmmeter to check for short or
open.
TEMPERATURE F VS. RESISTANCE R OF TEMPERATURE SENSOR
F
-25
-24
-23
-22
-21
-20
-19
-18
-17
-16
-15
-14
-13
-12
-11
-10
-9
-8
-7
-6
-5
-4
-3
-2
-1
0
1
2
3
4
5
6
7
8
9
10
11
12
R F R
196871 13 56985
190099 14 55284
183585 15 53640
177318 16 52051
171289 17 50514
165487 18 49028
159904 19 47590
154529 20 46200
149355 21 44855
144374 22 43554
139576 23 42295
134956 24 41077
130506 25 39898
126219 26 38757
122089 27 37652
118108 28 36583
114272 29 35548
110575 30 34545
107010 31 33574
103574 32 32634
100260 33 31723
97064 34 30840
93981 35 29986
91008 36 29157
88139 37 28355
85371 38 27577
82699 39 26823
80121 40 26092
77632 41 25383
75230 42 24696
72910 43 24030
70670 44 23384
68507 45 22758
66418 46 22150
64399 47 21561
62449 48 20989
60565 49 20435
58745 50 19896
3. Check resistance reading to chart of resistance. Use
sensor ambient temperature. (Tolerance of part is
± 10%.)
4. If sensor resistance reads very low, then sensor is
shorted and will not allow proper operation of the
heat pump control.
5. If sensor is out of tolerance, shorted, open or reads
very low ohms then it should be replaced.
F R
51 19374
52 18867
53 18375
54 17989
55 17434
56 16984
57 16547
58 16122
59 15710
60 15310
61 14921
62 14544 100
63 14177 101
64 13820 102
65 13474 103
66 13137 104
67 12810 105
68 12492 106
69 12183 107
70 11883 108
71 11591 109
72 11307 110
73 11031 111
74 10762 112
75 10501 113
76 10247 114
77 10000 115
78 9760 116
79 9526 117
80 9299 118
81 9077 119
82 8862 120
83 8653 121
84 8449 122
85 8250 123
86 8057 124
87 7869
88 7686
F R
89 7507
90 7334
91 7165
92 7000
93 6840
94 6683
95 6531
96 6383
97 6239
98 6098
99 5961
5827
5697
5570
5446
5326
5208
5094
4982
4873
4767
4663
4562
4464
4367
4274
4182
4093
4006
3921
3838
3757
3678
3601
3526
3452
Manual 2100-586B
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