Lennox Merit 14ACX−018−230 Installation Instructions Manual page 27

Table 4. HFC−410A Normal Operating Pressures (Liquid +10 and Suction +5 psig)
IMPORTANT
Model −018
**Temp.
Liquid / Liquid /
5F (5C)
Suction Suction
Expansion Valve (TXV)*
65 (18) 230 / 138 225 / 135
70 (21) 244 / 139 242 / 137
75 (24) 265 / 140 260 / 138
80 (27) 286 / 140 282 / 140
85 (29) 307 / 142 304 / 141
90 (32) 330 / 143 326 / 142
95 (35) 351 / 144 351 / 142
100 (38) 380 / 144 376 / 144
105 (41) 407 / 145 403 / 145
110 (43) 436 / 146 433 / 145
115 (45) 466 / 147 463 / 147
Fixed Orifice (RFC)*
65 (18) 232 / 124 228 / 125
70 (21) 248 / 127 244 / 127
75 (24) 267 / 131 261 / 131
80 (27) 286 / 135 284 / 134
85 (29) 307 / 138 303 / 137
90 (32) 328 / 141 325 / 140
95 (35) 351 / 143 347 / 142
100 (38) 375 / 146 370 / 144
105 (41) 400 / 148 394 / 146
110 (43) 426 / 150 420 / 148
115 (46) 457 / 153 447 / 150
*Values shown are typical pressures; indoor unit match up, indoor air quality equipment, and indoor load will cause the pressures to vary.
**Temperature of the air entering the outside coil.
Use this table to perform maintenance checks; it is not a procedure for charging the
system. Minor variations in these pressures may be due to differences in installations.
Significant deviations could mean that the system is not properly charged or that a
problem exists with some component in the system.
−024 −030
Liquid / Liquid /
Suction Suction
226 / 129 238 / 132
241 / 131 254 / 135
259 / 134 273 / 138
281 / 138 293 / 140
301 / 140 316 / 142
324 / 141 340 / 143
348 / 142 366 / 144
372 / 143 392 / 145
399 / 144 420 / 147
428 / 145 449 / 148
456 / 146 480 / 149
229 / 128 241 / 131
243 / 129 258 / 134
261 / 132 277 / 136
284 / 135 298 / 139
305 / 138 321 / 141
327 / 140 342 / 143
349 / 142 366 / 145
372 / 144 392 / 147
396 / 146 416 / 149
422 / 148 446 / 151
449 / 150 480 / 152
−036 −041
Liquid / Liquid /
Suction Suction
233 / 142 236 / 138
239 / 142 253 / 140
256 / 143 273 / 141
278 / 144 296 / 142
299 / 145 318 / 143
321 / 145 341 / 144
343 / 146 366 / 146
366 / 147 392 / 147
389 / 148 417 / 148
421 / 149 445 / 149
452 / 151 475 / 151
228 / 131 248 / 135
245 / 135 266 / 138
263 / 138 285 / 141
284 / 141 305 / 143
306 / 144 327 / 145
327 / 146 349 / 147
348 / 148 372 / 149
372 / 149 396 / 150
395 / 151 421 / 152
424 /153 447 / 153
453 / 155 476 / 154
Page 27
−042 −047
Liquid / Liquid /
Suction Suction
233 / 139 238 / 136
252 / 140 256 / 138
272 / 141 277 / 139
294 / 142 299 / 140
315 / 142 320 / 139
338 / 144 343 / 140
361 / 144 369 / 141
387 / 144 395 / 142
413 / 145 422 / 144
442 / 148 450 / 146
465 / 148 481 / 148
232 / 125 240 / 126
249 / 129 260 / 129
268 / 133 281 / 133
286 / 136 301 / 135
312 / 140 324 / 138
332 / 142 346 / 140
357 / 144 371 / 142
379 / 146 395 / 144
406 / 149 420 / 146
430 / 150 447 / 148
460 / 152 473 / 150
−048 −059/−060
Liquid /
Suction
239 / 133
258 / 135
278 / 136
300 / 137
323 / 138
346 / 139
370 / 140
396 / 142
415 / 143
449 / 145
476 / 147
244 / 125
263 / 128
281 / 131
303 / 134
324 / 136
347 / 139
370 / 141
394 / 143
418 / 145
444 / 146
471 / 147
14ACX SERIES