5.1 Thermal Protection
The compressor motor windings are
protected from extreme temperatures by the
LonCEM Module and the Carlyle Electronic
Module (CEM) in older systems. All compres-
sors are supplied with two 5K NTC (Negative
Thermal Coefficient) thermistors in the motor
windings.The module will limit the maximum
motor temperature to 240 F (116 C) and is an
auto-reset device. Only one 5K sensor is used;
the other is a spare. The temperature vs. resis-
tance characteristics of the 5K thermistors are
shown below. Additionally, the DC voltage
across the thermistors
TEMPERATURE vs. RESISTANCE TABLE
Section 5 — Electrical Specifications
may be measured at the module while the compres-
sor is running and compared to the Temperature vs.
DC voltage table. (WARNING: DO NOT MEASURE
THE DC VOLTAGE INSIDE THE TERMINAL
BOX.)
Note that while the resistance of the sensors does
not change, the measured DC voltage will be differ-
ent depending on which protection module is used.
See the "Motor and Discharge Thermistors" table in
Appendix A for the conversion when using the newer
LonCEM module, and the "Temperature VS. DC
Voltage" table in Appendix B for older applications
with the CEM module.
25
TEMPERATURE RESISTANCE
C F OHMS
0 32 16352.4
1 33.8 15515.2
2 35.6 14750
3 37.4 14027.1
4 39.2 13343.8
5 41 12697.8
6 42.8 12086.3
7 44.6 11508
8 46.4 10960.8
9 48.2 10442.6
10 50 9951.8
11 51.8 9486.8
12 53.6 9046.3
13 55.4 8628.7
14 57.2 8232.5
15 59 7857
16 60.8 7500.6
17 62.6 7162.3
18 64.4 6841.3
19 66.2 6526.4
20 68 6246.8
21 69.8 5971.6
22 71.6 5710
23 73.4 5461.3
24 75.2 5225
25 77 5000
26 78.8 4786
27 80.6 4582.4
28 82.4 4388.5
29 84.2 4203.9
30 86 4028
31 87.8 3860.5
32 89.6 3700.8
33 91.4 3548.5
34 93.2 3403.5
35 95 3265.1
36 96.8 3133.1
37 98.6 3007.1
TEMPERATURE RESISTANCE
C F OHMS
38 100.4 2886.9
39 102.2 2772.1
40 104 2662.4
41 105.8 2557.8
42 107.6 2457.7
43 109.4 2362.1
44 111.2 2270.8
45 113 2183.45
46 114.8 2099.93
47 116.5 2020.04
48 118.4 1943.6
49 120.2 1870.5
50 122 1800.49
51 123.8 1733.46
52 125.6 1669.66
53 127.4 1607.81
54 129.2 1548.95
55 131 1492.54
56 132.8 1438.46
57 134.6 1386.62
58 136.4 1336.93
59 138.2 1289.26
60 140 1243.53
61 141.8 1199.7
62 143.6 1157.59
63 145.4 1117.18
64 147.2 1078.37
65 149 1041.15
66 150.8 1005.38
67 152.6 971.03
68 154.4 938.02
69 156.2 906.3
70 158 875.81
71 159.8 846.5
72 161.6 818.31
73 163.4 791.21
74 165.2 765.14
75 167 740.06
TEMPERATURE RESISTANCE
C F OHMS
76 168.8 715.93
77 170.6 692.68
78 172.4 670.34
79 174.2 648.82
80 176 628.09
81 177.8 608.11
82 179.6 588.88
83 181.4 570.36
84 183.2 552.5
85 185 535.29
86 186.8 518.7
87 188.6 502.7
88 190.4 487.28
89 192.2 474.4
90 194 458.06
91 195.8 444.2
92 197.6 430.85
93 199.4 417.96
94 201.2 405.51
95 203 393.49
96 204.8 381.89
97 206.6 370.69
98 208.4 359.87
99 210.2 349.41
100 212 339.32
101 213.8 329.55
102 215.6 320.12
103 217.4 311
104 219.2 302.18
105 221 293.65
106 222.8 285.41
107 224.6 277.43
108 226.4 269.72
109 228.2 262.26
110 230 255.03
111 231.8 248.04
112 233.6 241.28
113 235.4 234.72
TEMPERATURE RESISTANCE
C F OHMS
114 237.2 228.38
115 239 222.24
116 240.8 216.29
117 242.6 210.53
118 244.4 204.95
119 246.2 199.54
120 248 194.3
121 249.8 189.22
122 251.6 184.3
123 253.4 178.5
124 255.2 174.89
125 257 170.41
126 258.8 166.06
127 260.6 161.83
128 262.4 157.74
129 264.2 153.77
130 266 149.91
131 267.8 146.17
132 269.6 142.54
133 271.4 139.02
134 273.2 136.6
135 275 132.27
136 276.8 129.04
137 278.6 125.91
138 280.4 122.87
139 282.2 119.91
140 284 117.04
141 285.8 114.25
142 287.6 111.54
143 289.4 108.9
144 291.2 106.34
145 293 103.86
146 294.8 101.43
147 296.6 99.074
148 298.4 95.785
149 300.2 94.559
150 302 92.393
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