Charging - Lennox ELITE 12GCS Series Unit Information

IV−Charging
WARNING
Refrigerant can be harmful if it is inhaled. Refrigerant
must be used and recovered responsibly.
Failure to follow this warning may result in personal
injury or death.
A−12CHP
For maximum performance of this heat pump system, the
operating temperatures and pressures should be checked
and superheat determined at Standard ARI test conditions
of 82_F outdoor − 80_F indoor dry bulb/67_F wet bulb. If su-
perheat measured deviates from values in table 6, refriger-
ant charge should be adjusted accordingly for maximum
performance.
Verify system performance using table 7 or table 8 as a gen-
eral guide. These tables should not be used for charging the
unit. Minor variations in these pressures may be expected
due to differences in installations. Significant differences
70°F db RETURN AIR
MODEL PRESSURE
12CHP−024
12CHP−030
12CHP−036
SUCTION SUCTION
12CHP−042
12CHP−048
12CHP−060
12CHP−024
12CHP−030
12CHP−036
LIQUID LIQUID
12CHP−042
12CHP−048
12CHP−060
80°F db / 67°F wb RETURN AIR
MODEL PRESSURE
12CHP−024
12CHP−030
12CHP−036
SUCTION SUCTION
12CHP−042
12CHP−048
12CHP−060
12CHP−024
12CHP−030
12CHP−036
LIQUID LIQUID
12CHP−042
12CHP−048
12CHP−060
TABLE 7
NORMAL OPERATING PRESSURES −− HEATING MODE
AIR TEMPERATURE ENTERING OUTDOOR COIL (°F)
0° 5° 10° 15°
17 20 24 28
14 17 21 25
14 17 21 25
16 19 23 27
15 18 22 26
14 17 21 25
181 191 200 209
168 173 179 184
165 172 178 184
167 174 181 187
203 211 220 229
163 170 177 183
TABLE 8
NORMAL OPERATING PRESSURES −− COOLING MODE
AIR TEMPERATURE ENTERING OUTDOOR COIL (°F)
65° 70° 75° 80°
78 79 81 82
78 79 81 82
75 77 80 82
80 81 82 84
78 79 80 82
78 79 80 82
140 155 170 184
145 159 173 187
146 161 176 191
155 170 185 200
164 180 196 213
166 182 198 214
Page 17
could mean that the system is not properly charged or that a
problem exists with some component in the system. Used
carefully, this table could serve as a useful service guide.
Table 7 should be used when unit is charged during the
heating mode. If outdoor ambient is below 45°F, run unit
through defrost cycle first, wait 15 minutes for system pres-
sures to stabilize, then take pressures. Data in table 7 is
based on 70°F dry bulb return air. Data in table 8 is based
on 80°F dry bulb / 87°F wet bulb return air. Allow unit opera-
tion to stabilize before taking pressure readings.
12CHP SUCTION SUPERHEAT TABLE
UNIT MODEL NO.
12CHP−024
12CHP−030
12CHP−036
12CHP−042
12CHP−048
12CHP−060
20° 25° 30° 35°
33 38 43 49
29 34 39 45
29 34 39 45
31 36 41 45
30 35 40 45
29 34 39 44
219 228 237 247
189 195 200 205
191 197 203 210
194 201 207 214
237 246 255 263
190 197 203 210
82° 85° 90° 95°
83 84 85 87
83 84 85 87
83 84 87 89
84 85 86 87
82 83 84 85
82 83 84 85
190 199 213 228
193 202 216 230
197 206 221 236
206 215 230 245
219 229 245 261
220 229 245 261
TABLE 6
SUCTION SUPERHEAT
82_F OD − 80_F IDDB
/ 67_F IDWB
18 20 18 − 20_
40° 45° 50° 55°
55 62 69 74
51 56 63 70
51 56 63 70
51 55 62 68
51 55 62 68
50 54 61 67
256 265 275 284
211 216 221 227
216 222 229 235
221 227 234 241
272 281 289 298
217 223 230 237
100° 105° 110° 115°
89 90 92 93
89 90 92 93
91 94 96 98
88 89 90 92
86 87 88 90
86 87 88 90
243 257 272 286
244 258 273 287
251 266 281 296
260 275 290 305
277 293 309 326
277 293 308 324
60°
81
78
78
76
76
75
293
232
241
247
307
243
125°
96
96
103
94
92
92
316
315
326
335
358
356