Manual 2100-790
Page
33 of 49
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.
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
Temperature F vs. Resistance R of Temperature Sensor
F
R
F
R
F
R
F
R
-25.0
196871
13.0
56985
53.0
19374
89.0
7507
-24.0
190099
14.0
55284
52.0
18867
90.0
7334
-23.0
183585
15.0
53640
53.0
18375
91.0
7165
-22.0
177318
16.0
52051
54.0
17989
92.0
7000
-21.0
171289
17.0
50514
55.0
17434
93.0
6840
-20.0
165487
18.0
49028
56.0
16984
94.0
6683
-19.0
159904
19.0
47590
57.0
16547
95.0
6531
-18.0
154529
20.0
46200
58.0
16122
96.0
6383
-17.0
149355
21.0
44855
59.0
15710
97.0
6239
-16.0
144374
22.0
43554
60.0
15310
98.0
6098
-15.0
139576
23.0
42295
61.0
14921
99.0
5961
-14.0
134956
24.0
41077
62.0
14544
100.0
5827
-13.0
130506
25.0
39898
63.0
14177
101.0
5697
-12.0
126219
26.0
38757
64.0
13820
102.0
5570
-11.0
122089
27.0
37652
65.0
13474
103.0
5446
-10.0
118108
28.0
36583
66.0
13137
104.0
5326
-9.0
114272
29.0
35548
67.0
12810
105.0
5208
-8.0
110575
30.0
34545
68.0
12492
106.0
5094
-7.0
107010
31.0
33574
69.0
12183
107.0
4982
-6.0
103574
32.0
32634
70.0
11883
108.0
4873
-5.0
100260
33.0
31723
71.0
11591
109.0
4767
-4.0
97064
34.0
30840
72.0
11307
110.0
4663
-3.0
93981
35.0
29986
73.0
11031
111.0
4562
-2.0
91008
36.0
29157
74.0
10762
112.0
4464
-1.0
88139
37.0
28355
75.0
10501
113.0
4367
0.0
85371
38.0
27577
76.0
10247
114.0
4274
1.0
82699
39.0
26823
77.0
10000
115.0
4182
2.0
80121
40.0
26092
78.0
9760
116.0
4093
3.0
77632
41.0
25383
79.0
9526
117.0
4006
4.0
75230
42.0
24696
80.0
9299
118.0
3921
5.0
72910
43.0
24030
81.0
9077
119.0
3838
6.0
70670
44.0
23384
82.0
8862
120.0
3757
7.0
68507
45.0
22758
83.0
8653
121.0
3678
8.0
66418
46.0
22150
84.0
8449
122.0
3601
9.0
64399
47.0
21561
85.0
8250
123.0
3526
10.0
62449
48.0
20989
86.0
8057
124.0
3452
11.0
60565
49.0
20435
87.0
7869
12.0
58745
50.0
19896
88.0
7686
