Checking Temperature Sensor Outside Unit Circuit; Table 9 - Bard W24HY-A Installation Instructions Manual

Checking Temperature Sensor Outside
Unit Circuit
1. Disconnect temperature sensor from board and
from outdoor coil.
2. Use an ohmmeter to measure the resistance of the
sensor. Also use ohmmeter to check for short or
open.
F
-25.0
-24.0
-23.0
-22.0
-21.0
-20.0
-19.0
-18.0
-17.0
-16.0
-15.0
-14.0
-13.0
-12.0
-11.0
-10.0
-9.0
-8.0
-7.0
-6.0
-5.0
-4.0
-3.0
-2.0
-1.0
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
11.0
12.0
Temperature F vs. Resistance R of Temperature Sensor
R F R
196871 13.0 56985
190099 14.0 55284
183585 15.0 53640
177318 16.0 52051
171289 17.0 50514
165487 18.0 49028
159904 19.0 47590
154529 20.0 46200
149355 21.0 44855
144374 22.0 43554
139576 23.0 42295
134956 24.0 41077
130506 25.0 39898
126219 26.0 38757
122089 27.0 37652
118108 28.0 36583
114272 29.0 35548
110575 30.0 34545
107010 31.0 33574
103574 32.0 32634
100260 33.0 31723
97064 34.0 30840
93981 35.0 29986
91008 36.0 29157
88139 37.0 28355
85371 38.0 27577
82699 39.0 26823
80121 40.0 26092
77632 41.0 25383
75230 42.0 24696
72910 43.0 24030
70670 44.0 23384
68507 45.0 22758
66418 46.0 22150
64399 47.0 21561
62449 48.0 20989
60565 49.0 20435
58745 50.0 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, 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, it should be replaced.

TABLE 9

F R
53.0 19374
52.0 18867
53.0 18375
54.0 17989
55.0 17434
56.0 16984
57.0 16547
58.0 16122
59.0 15710
60.0 15310
61.0 14921
62.0 14544
63.0 14177
64.0 13820
65.0 13474
66.0 13137
67.0 12810
68.0 12492
69.0 12183
70.0 11883
71.0 11591
72.0 11307
73.0 11031
74.0 10762
75.0 10501
76.0 10247
77.0 10000
78.0 9760
79.0 9526
80.0 9299
81.0 9077
82.0 8862
83.0 8653
84.0 8449
85.0 8250
86.0 8057
87.0 7869
88.0 7686
F R
89.0 7507
90.0 7334
91.0 7165
92.0 7000
93.0 6840
94.0 6683
95.0 6531
96.0 6383
97.0 6239
98.0 6098
99.0 5961
100.0 5827
101.0 5697
102.0 5570
103.0 5446
104.0 5326
105.0 5208
106.0 5094
107.0 4982
108.0 4873
109.0 4767
110.0 4663
111.0 4562
112.0 4464
113.0 4367
114.0 4274
115.0 4182
116.0 4093
117.0 4006
118.0 3921
119.0 3838
120.0 3757
121.0 3678
122.0 3601
123.0 3526
124.0 3452
Manual 2100-790
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