Bard CH4S1 - Manual (Page 22)

Manual 2100-455M
Page 22 of 28
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.
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.
temPerature F Vs resIstance r OF temPerature
F r F r F r F r
-25 196871 13 56985 51 19374 89 7507
-24 190099 14 55284 52 18867 90 7334
-23 183585 15 53640 53 18375 91 7165
-22 177318 16 52051 54 17989 92 7000
-21 171289 17 50514 55 17434 93 6840
-20 165487 18 49028 56 16984 94 6683
-19 159904 19 47590 57 16547 95 6531
-18 154529 20 46200 58 16122 96 6383
-17 149355 21 44855 59 15710 97 6239
-16 144374 22 43554 60 15310 98 6098
-15 139576 23 42295 61 14921 99 5961
-14 134956 24 41077 62 14544 100 5827
-13 130506 25 39898 63 14177 101 5697
-12 126219 26 38757 64 13820 102 5570
-11 122089 27 37652 65 13474 103 5446
-10 118108 28 36583 66 13137 104 5326
-9 114272 29 35548 67 12810 105 5208
-8 110575 30 34545 68 12492 106 5094
-7 107010 31 33574 69 12183 107 4982
-6 103574 32 32634 70 11883 108 4873
-5 100260 33 31723 71 11591 109 4767
-4 97064 34 30840 72 11307 110 4663
-3 93981 35 29986 73 11031 111 4562
-2 91008 36 29157 74 10762 112 4464
-1 88139 37 28355 75 10501 113 4367
0 85371 38 27577 76 10247 114 4274
1 82699 39 26823 77 10000 115 4182
2 80121 40 26092 78 9760 116 4093
3 77632 41 25383 79 9526 117 4006
4 75230 42 24696 80 9299 118 3921
5 72910 43 24030 81 9077 119 3838
6 70670 44 23384 82 8862 120 3757
7 68507 45 22758 83 8653 121 3678
8 66418 46 22150 84 8449 122 3601
9 64399 47 21561 85 8250 123 3526
10 62449 48 20989 86 8057 124 3452
11 60565 49 20435 87 7869
12 58745 50 19896 88 7686