58
Table 36 — Thermistor Identification
THERMISTOR ID DESCRIPTION RESISTANCE AT 77°F (25°C) CONNECTION POINT
EWT Entering Water Temperature Thermistor 5k SIOBA-J25-AI01
LWT Leaving Water Temperature Thermistor 5k SIOBA-J25-AI02
OAT Outdoor Air Temperature Thermistor 5k SIOBA-J25-AI03
SGTA Circuit A Suction Gas Temperature Thermistor 5k AUXA-J6-CH12
SGTB Circuit B Suction Gas Temperature Thermistor 5k AUXB-J6-CH12
DGTA Circuit A Discharge Gas Temperature Thermistor 5k AUXA-J6-CH11
DGTB Circuit B Discharge Gas Temperature Thermistor 5k AUXB-J6-CH11
LIQT_A Circuit A Liquid Line Temperature Thermistor 5k AUXA-J7-CH13
LIQT_B Circuit B Liquid Line Temperature Thermistor 5k AUXB-J7-CH13
ECTA Circuit A Economizer Temperature Thermistor 5k SIOBA-J25-AI05
ECTB Circuit B Economizer Temperature Thermistor 5k SIOBB-J25-AI05
DUAL Dual Chiller Leaving Water Temperature Thermistor 5k SIOBB-J25-AI03
Comp A Temp Circuit A Compressor Motor Temperature Thermistor 5k SIOBA-J25-AI04
Comp B Temp Circuit B Compressor Motor Temperature Thermistor 5k SIOBB-J25-AI04
SPT Space Temperature Thermistor 10k EMM-J6-CH2
Table 37 — Compressor Thermistor Temperature vs. Resistance
°F °C Nominal Resistance, Ohms
–22 –30 88,500
–13 –25 65,210
–4 –20 48,535
5 –15 36,477
14 –10 27,665
23 –5 21,162
32 0 16,325
41 5 12,696
50 10 9,950
59 15 7,854
68 20 6,245
77 25 5,000
86 30 4,029
95 35 3,266
104 40 2,664
113 45 2,185
122 50 1,802
131 55 1,493
140 60 1,244
149 65 1,042
158 70 876
167 75 741
176 80 629
185 85 536
194 90 459
203 95 394
212 100 340
221 105 294
230 110 256
239 115 223
248 120 195
257 125 171
266 130 151
275 135 133
284 140 117
293 145 104
302 150 93
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