59
181 83 570
183 84 552
185 85 535
187 86 518
189 87 502
190 88 487
192 89 472
194 90 458
196 91 444
198 92 431
199 93 418
201 94 405
203 95 393
205 96 382
207 97 370
208 98 360
210 99 349
212 100 339
214 101 329
216 102 320
217 103 311
219 104 302
221 105 293
223 106 285
225 107 277
226 108 269
228 109 262
230 110 255
232 111 248
234 112 241
235 113 234
237 114 228
239 115 222
241 116 216
Table 18 — 5K Thermistor Temperature vs.
Resistance (cont)
°F °C RESISTANCE, OHMS
243 117 210
244 118 205
246 119 199
248 120 194
250 121 189
252 122 184
253 123 179
255 124 175
257 125 170
259 126 166
261 127 162
262 128 157
264 129 154
266 130 150
268 131 146
270 132 142
271 133 139
273 134 135
275 135 132
277 136 129
279 137 126
280 138 123
282 139 120
284 140 117
286 141 114
288 142 111
289 143 109
291 144 106
293 145 104
295 146 101
297 147 99
298 148 97
300 149 94
302 150 92
Table 18 — 5K Thermistor Temperature vs.
Resistance (cont)
°F °C RESISTANCE, OHMS
If a more accurate check is required, unit must be shut down and
thermistor removed and checked at a known temperature (freezing
point or boiling point of water) using either voltage drop measured
across thermistor at the J3 terminal, by determining the resistance
with unit shut down and thermistor disconnected from J3. Com-
pare the values determined with the value read by the control in
the Temperatures mode using the controller display.
Fan Blade and Fan Motor Service
A formed metal mount bolted to the coil caps supports each fan
and motor assembly. A shroud and a wire grille provide protection
from the rotating fan. See Figure 46. To remove the fan a special
puller (RCD part no. 30RB680082) can be used. The fan utilizes a
set screw and does not require the use of retaining compound in
the keyway. The fan can be removed without the puller, but its use
eases disassembly. The exposed end of the fan motor shaft is pro-
tected from weather by grease. If fan motor must be removed for
service or replacement, re-grease the fan shaft. The fan needs to be
positioned fully down against the step on the motor shaft. Apply
blue thread locker (Loctite 243) to the threads of both the axial bolt
and the set screw. Install the thick washer and M8 axial bolt; do
not fully tighten. Install set screw and tighten to 16 ± 2 ft-lbs (21.7
± 2.7 Nm). Torque the axial bolt to 24 ± 2 ft-lbs (32.5 ± 2.7 Nm).
Reinstall shroud and wire grille.
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