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Sensor Inputs
All sensor inputs are 'paired wires' connecting each
component to the board. Therefore, continuity on pressure
switches, for example can be checked at the board
connector. The thermistor resistance should be measured
with the connector removed so that only the impedance of
the thermistor is measured. If desired, this reading can be
compared to the thermistor resistance chart shown in Table
15. An ice bath can be used to check the calibration of the
thermistor.
Variable ( VE ) Series IOM - 60Hz HFC-410A
Trilogy
®
Table 15: Nominal resistance at various temperatures
Temp (ºC)
-17.8
-17.5
-16.9
-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
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
c l i m a t e m a s t e r . c o m
R e v i s i o n D a t e : 2 2 D e c e m b e r , 2 0 2 1
Troubleshooting
Resistance
Temp (ºF)
Temp (ºC) Temp (ºF)
(kOhm)
0.0
85.34
55
0.5
84.00
56
1.5
81.38
57
10.4
61.70
58
12.2
58.40
59
14.0
55.30
60
15.8
52.38
61
17.6
49.64
62
19.4
47.05
63
21.2
44.61
64
23.0
42.32
65
24.8
40.15
66
26.6
38.11
67
28.4
36.18
68
30.2
34.37
69
32.0
32.65
70
33.8
31.03
71
35.6
29.50
72
37.4
28.05
73
39.2
26.69
74
41.0
25.39
75
42.8
24.17
76
44.6
23.02
77
46.4
21.92
78
48.2
20.88
79
50.0
19.90
80
51.8
18.97
81
53.6
18.09
82
55.4
17.26
83
57.2
16.46
84
59.0
15.71
85
60.8
15.00
86
62.6
14.32
87
64.4
13.68
88
66.2
13.07
89
68.0
12.49
90
69.8
11.94
91
71.6
11.42
92
73.4
10.92
93
75.2
10.45
94
77.0
10.00
95
78.8
9.57
96
80.6
9.16
97
82.4
8.78
98
84.2
8.41
99
86.0
8.06
100
87.8
7.72
101
89.6
7.40
102
91.4
7.10
103
93.2
6.81
104
95.0
6.53
105
96.8
6.27
106
98.6
6.01
107
100.4
5.77
108
102.2
5.54
109
104.0
5.33
110
105.8
5.12
111
107.6
4.92
112
109.4
4.72
113
111.2
4.54
114
113.0
4.37
115
114.8
4.20
116
116.6
4.04
117
118.4
3.89
118
120.2
3.74
119
122.0
3.60
120
123.8
3.47
121
125.6
3.34
122
127.4
3.22
123
129.2
3.10
Resistance
(kOhm)
131.0
2.99
132.8
2.88
134.6
2.77
136.4
2.67
138.2
2.58
140.0
2.49
141.8
2.40
143.6
2.32
145.4
2.23
147.2
2.16
149.0
2.08
150.8
2.01
152.6
1.94
154.4
1.88
156.2
1.81
158.0
1.75
159.8
1.69
161.6
1.64
163.4
1.58
165.2
1.53
167.0
1.48
168.8
1.43
170.6
1.39
172.4
1.34
174.2
1.30
176.0
1.26
177.8
1.22
179.6
1.18
181.4
1.14
183.2
1.10
185.0
1.07
186.8
1.04
188.6
1.01
190.4
0.97
192.2
0.94
194.0
0.92
195.8
0.89
197.6
0.86
199.4
0.84
201.2
0.81
203.0
0.79
204.8
0.76
206.6
0.74
208.4
0.72
210.2
0.70
212.0
0.68
213.8
0.66
215.6
0.64
217.4
0.62
219.2
0.60
221.0
0.59
222.8
0.57
224.6
0.55
226.4
0.54
228.2
0.52
230.0
0.51
231.8
0.50
233.6
0.48
235.4
0.47
237.2
0.46
239.0
0.44
240.8
0.43
242.6
0.42
244.4
0.41
246.2
0.40
248.0
0.39
249.8
0.38
251.6
0.37
253.4
0.36
53
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Troubleshooting
