Lennox XP14 Elite Series Installation Instructions Manual page 17

IMPORTANT
Table 5. Normal Operating Pressures - Liquid +10 and Vapor +5 PSIG* (Cooling)
XP14-018 XP14-024 XP14-030 XP14-036 XP14-042 XP14-048 XP14-060
Liquid/ Liquid/ Liquid/ Liquid/ Liquid/ Liquid/ Liquid/
°F (°C)** Vapor Vapor Vapor Vapor Vapor Vapor Vapor
Heating
60 (15) 346 / 139 352 / 138 338 / 137 350 / 134 373 / 139 355 / 130 351 / 117
50 (10) 323 / 117 331 / 114 334 / 112 331 / 117 363 / 117 336 / 113 333 / 105
40 (4) 306 / 98 304 / 99 312 / 93 313 / 97 348 / 97 315 / 88 316 / 88
30 (-1) 278 / 84 299 / 80 302 / 74 298 / 83 336 / 74 296 / 72 308 / 70
20 (-7) 273 / 66 283 / 66 280 / 53 284 / 66 322 / 64 286 / 64 300 / 61
Cooling
65 (18) 226 / 140 233 / 137 238 / 138 220 / 138 223 / 125 231 / 136 243 / 136
70 (21) 244 / 141 252 / 138 263 / 139 236 / 140 241 / 130 248 / 139 263 / 137
75 (24) 263 / 142 271 / 140 279 / 139 256 / 141 261 / 134 271 / 140 282 / 138
80 (27) 283 / 143 292 / 141 299 / 140 276 / 142 282 / 138 291 / 142 306 / 139
85 (29) 302 / 144 314 / 142 324 / 141 298 / 143 302 / 139 312 / 143 327 / 140
90 (32) 328 / 145 338 / 143 340 / 142 321 / 144 326 / 140 335 / 144 351 / 141
95 (35) 351 / 146 361 / 145 375 / 145 344 / 144 349 / 141 359 / 145 376 / 142
100 (38) 376 / 147 387 / 146 397 / 145 369 / 146 374 / 142 384 / 146 401 / 143
105 (41) 402 / 148 412 / 147 424 / 147 394 / 147 399 / 143 411 / 148 426 / 145
110 (38) 430 / 149 441 / 148 454 / 150 421 / 148 428 / 145 439 / 149 452 / 146
115 (45) 465 / 150 471 / 151 485 / 150 449 / 149 455 / 146 468 / 150 484 / 148
*IMPORTANT--These are most popular match-up pressures. Indoor match up, indoor air quality, and indoor
load cause pressures to vary.
**Temperature of the air entering the outside coil.
1. Recover the refrigerant from the unit,
2. Conduct leak check; evacuate as previously outlined,
3, Weigh in the unit nameplate charge plus any charge
required for line set differences from 15 feet and any
extra indoor unit match-up amount per table 7, (If
weighing facilities are not available, use the
subcooling method,)
Table 6. Charge per Line Set Lengths
Liquid Line Oz. per 5 ft. (g per 1.5m) adjust from
Set Diameter 15 ft. (4.6m) line set*
3/8 in. (9.5mm) 3 ounce per 5 ft. (85g per 1.5m)
NOTE - *if line length is greater than 15 ft. (4.6 m), add this amount, If
line length is less than 15 ft. (4.6 m), subtract this amount.
Requirements--these items are required for charging:
• Manifold gauge set connected to unit.
• Thermometers for measuring outdoor ambient, liquid
line, and vapor line temperatures,
When to use cooling mode--When outdoor
temperature is 60°F (15°C) and above, use cooling mode
to adjust charge,
When to use heating mode--When the outdoor
temperature is below 60°F (15°C), use the heating mode to
adjust the charge,
Adding Charge for Indoor Match-Up--Table 7 lists all
the Lennox recommended indoor unit matches along with
the charge levels for the various sizes of outdoor units,
Page 17
XP14 SERIES