Fan Blade And Fan Motor Service - Carrier 09FC020 Installation, Start-Up And Maintenance Instructions

Table 18 — 5K Thermistor Temperature vs.
Resistance (cont)
°F
181
183
185
187
189
190
192
194
196
198
199
201
203
205
207
208
210
212
214
216
217
219
221
223
225
226
228
230
232
234
235
237
239
241
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.
°C RESISTANCE, OHMS
83 570
84 552
85 535
86 518
87 502
88 487
89 472
90 458
91 444
92 431
93 418
94 405
95 393
96 382
97 370
98 360
99 349
100 339
101 329
102 320
103 311
104 302
105 293
106 285
107 277
108 269
109 262
110 255
111 248
112 241
113 234
114 228
115 222
116 216
Table 18 — 5K Thermistor Temperature vs.
Resistance (cont)
°F
243
244
246
248
250
252
253
255
257
259
261
262
264
266
268
270
271
273
275
277
279
280
282
284
286
288
289
291
293
295
297
298
300
302

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.
59
°C RESISTANCE, OHMS
117 210
118 205
119 199
120 194
121 189
122 184
123 179
124 175
125 170
126 166
127 162
128 157
129 154
130 150
131 146
132 142
133 139
134 135
135 132
136 129
137 126
138 123
139 120
140 117
141 114
142 111
143 109
144 106
145 104
146 101
147 99
148 97
149 94
150 92