Table 5
Normal Operating Pressures
80°F db / 87"F wb RETURN AIR Air Temperature Entering Outdoor Coil (°F)
Model Pressure 65° 70° 75 ° 80 ° 82° 85° 90° 95° 100 ° 105 ° 110° 115°
10GC5-024 72 75 79 81 82 83 85 87 88 89 91 92
10GCS-030 67 70 73 75 77 78 81 83 84 84 85 85
10GCS-036 72 75 77 80 81 82 84 86 88 89 91 92
Suction
10GCS-042 72 75 78 82 83 84 86 88 89 90 92 93
10GCS-048 75 79 80 81 83 84 85 86 87 88 89 90
10GCS-060 79 79 80 81 81 82 83 84 85 86 87 88
10GCS-024 171 185 199 213 219 229 244 260 267 275 301 327
10GCS-030 186 192 198 215 221 231 247 263 282 300 312 323
10GCS-036 175 191 207 224 230 239 255 271 288 305 320 335
10GCS-042 Liquid 181 197 213 229 235 245 261 277 294 310 328 345
10GCS-048 172 184 197 212 220 235 251 262 279 297 321 335
10GCS-060 192 205 222 236 249 263 277 293 313 331 348 360
12GCS-024 75 77 80 82 83 84 87 88 90 90 91 92
12GCS-030 67 70 73 76 80 78 82 85 86 86 87 88
12GCS-036 73 75 78 80 82 82 85 87 88 89 91 92
Suction
12GCS-042 77 78 80 81 81 82 84 85 87 88 89 90
12GCS-048 71 74 75 79 81 81 84 88 87 87 88 89
12GCS-060 74 77 80 81 82 84 85 88 96 96 87 88
12GCS-024 149 164 178 193 195 208 222 237 254 271 289 306
12GCS-030 145 161 178 192 195 207 223 238 254 270 288 305
12GCS-036 156 172 187 203 207 219 234 260 267 284 303 322
12GCS-042 Liquid 159 175 190 208 209 222 237 253 270 298 306 326
12GCS-048 152 168 185 198 209 215 230 246 254 281 298 316
12GCS-060 155 190 205 211 215 230 244 269 276 293 311 332
Used carefully, this table could serve as a useful service
guide. Data is based on 80°F dry bulb / 87°F wet bulb return
air. Allow unit operation to stabilize before taking pressure
readings.
Heating System - Sequence of Operation
When thermostat is calling for heat the draft motor is
energized by the 24 volt relay in the blower ignition control
which closes the 240V contact to the draft motor. When the
speed of the draft motor reaches the proper rpm the
pressure switch closes to power the ignition control.
When PSW on blower/ignition control is energized, a
pre-purge time is initiated (30 seconds nominal). When
pre-purge has expired the main gas valve is energized for
direct ignition. The blower/ignition control will energize the
main gas valve and spark electrode/flame sensor for a
period of 10 seconds. The blower/ignition control will spark
for the full 10 seconds regardless of establishing flame and
then look for a signal from the electrode/flame sensor that a
flame has been established. Forty-five (45) seconds
nominal after the initial trial for ignition, the circulating air
blower will start. If the electrode/flame sensor does not
sense that a flame has been established in the 10 second
interval, then the blower/ignition control will open the 24
volt contacts to the main gas valve. The blower/ignition
control is designed to repeat this trial for ignition a total of
three times. If, at the end of the third trial, a flame still has
not been established, then the blower/ignition control will
try to light again one hour later, The one hour retry is
indefinite, The blower/ignition control can be reset by
interrupting the unit power or the thermostat circuit, When
the thermostat is satisfied the draft motor gas valve is
de-energized. The blower motor will continue to run for 120
seconds after the furnace is shut down.
Figure 10 illustrates the critical measurements of the out-
door fan system. This dimension should be checked and
fan adjusted accordingly anytime servicing of the outdoor
fan system is required.
Condenser Fan Clearances
A I ' ' \ /'
Unit Model No. A
-024 3 in.
-030,-036,-042,-048,-060 3-1/2 in.
Figure 10
Page 12
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