Lennox 14ACX - Page 41

CHARGING INFORMATION
FOR COMPLETE CHARGING DETAILS, REFER TO THE OUTDOOR UNIT INSTALLATION INSTRUCTION.
Size
-018
-024
-030
-036
-041
-042
-047
-048
-059/-060
-
018
-
024
-
030
-
036
-
041
-
042
-
04
7 -
048
-
0
5
9/
-
060
Table 1- Normal Operating Pressures
1
°F(°C)
2
TXV System - Liquid Line ( + 10 psig) / Suction Line ( + 5 psig)
65 (18) 230 / 138 225 / 135 226 / 129 238 / 132 233 / 142 236 / 138 233 / 139 238 / 136 239 / 133
75 (24) 265 / 140 260 / 138 259 / 134 273 / 138 256 / 143 273 / 141 272 / 141 277 / 139 278 / 136
85 (29) 307 / 142 304 / 141 301 / 140 316 / 142 299 / 145 318 / 143 315 / 142 320 / 139 323 / 138
95 (35) 351 / 144 351 / 142 348 / 142 366 / 144 343 / 146 366 / 146 361 / 144 369 / 141 370 / 140
105 (41) 407 / 145 403 / 145 399 / 144 420 / 147 389 / 148 417 / 148 413 / 145 422 / 144 415 / 143
115 (45) 466 / 147 463 / 147 456 / 146 480 / 149 452 / 151 475 / 151 465 / 148 481 / 148 476 / 147
°F(°C)
2
RFC System - Liquid Line ( + 10 psig) / Suction Line ( + 5 psig )
65 (18) 232 / 124 228 / 125 229 / 128 241 / 131 228 / 131 248 / 135 232 / 125 240 / 126 244 / 125
75 (24) 267 / 131 261 / 131 261 / 132 277 / 136 263 / 138 285 / 141 268 / 133 281 / 133 281 / 131
85 (29) 307 / 138 303 / 137 305 / 138 321 / 141 306 / 144 327 / 145 312 / 140 324 / 138 324 / 136
95 (35) 351 / 143 347 / 142 349 / 142 366 / 145 348 / 148 372 / 149 357 / 144 371 / 142 370 / 141
105 (41) 400 / 148 394 / 146 396 / 146 416 / 149 395 / 151 421 / 152 406 / 149 420 / 146 418 / 145
115 (46) 457 / 153 447 / 150 449 / 150 480 / 152 453 / 155 476 / 154 460 / 152 473 / 150 471 / 147
Table 2- Approach (APP) Values
3
-TXV System - ºF (ºC) + 1ºF (0.5ºC)
65 (18) 4 (2.2) 2 (1.1) 2 (1.1) 2 (1.1) 3 (1.7) 6 (3.3) 9 (5.0) 7 (3.9) 8 (4.4)
75 (24) 5 (2.8) 4 (2.2) 4 (2.2) 5 (2.8) 3 (1.7) 8 (4.4) 9 (5.0) 8 (4.4) 9 (5.0)
85 (29) 6 (3.3) 4 (2.2) 6 (3.3) 8 (4.4) 4 (2.2) 8 (4.4) 8 (4.4) 8 (4.4) 9 (5.0)
95 (35) 5 (2.8) 4 (2.2) 5 (2.8) 7 (3.9) 4 (2.2) 8 (4.4) 8 (4.4) 8 (4.4) 9 (5.0)
105 (41) 3 (1.7) 4 (2.2) 5 (2.8) 6 (3.3) 4 (2.2) 8 (4.4) 8 (4.4) 8 (4.4) 9 (5.0)
115 (45) 3 (1.7) 3 (1.7) 4 (2.2) 6 (3.3) 5 (2.8) 8 (4.4) 8 (4.4) 9 (5.0) 9 (5.0)
Table 3- Subcooling (SC) Values
4
-TXV System - ºF (ºC) + 1ºF (0.5ºC)
65 (18) 10 (5.6) 10 (5.6) 11 (6.1) 13 (7.2) 9 (5.0) 10 (5.6) 6 (3.3) 8 (4.4) 8 (4.4)
75 (24) 6 (3.3) 7 (3.9) 8 (4.4) 9 (5.0) 7 (3.9) 7 (3.9) 6 (3.3) 8 (4.4) 7 (3.9)
85 (29) 6 (3.3) 8 (4.4) 6 (3.3) 7 (3.9) 7 (3.9) 7 (3.9) 6 (3.3) 8 (4.4) 8 (4.4)
95 (35) 6 (3.3) 9 (5.0) 6 (3.3) 8 (4.4) 7 (3.9) 7 (3.9) 6 (3.3) 8 (4.4) 7 (3.9)
105 (41) 10 (5.6) 9 (5.0) 7 (3.9) 9 (5.0) 7 (3.9) 7 (3.9) 6 (3.3) 8 (4.4) 6 (3.3)
115 (46) 10 (5.6) 10 (5.6) 8 (4.4) 10 (5.6) 6 (3.3) 7 (3.9) 5 (2.8) 7 (3.9) 6 (3.3)
1
Typical pressures; indoor evaporator match up, indoor air quantity, and
evaporator load will cause the pressures to vary.
2
Temperature of air entering outside coil.
3
Approach = Liquid Line Temp. minus Outdoor Ambient Temperature
4
Subcooling = Saturation Temp. minus Liquid Line Temp Temperature
AIRFLOW CHECK - Both airflow and refrigerant charge must be monitored for a
proper system set‐up. It may be necessary to alternately check and adjust the
airflow and the refrigerant charge.
NOTE - Be sure that filters and indoor and outdoor coils are clean before testing.
To determine temperature drop across indoor coil (Delta-T), measure the entering
air dry bulb (DB) and wet bulb (WB) temperatures at the indoor coil. Find Delta-T
in table 4. Measure coil's leaving air DB and subtract that value from entering air
DB. The measured difference should be within +
3ºF (+1.8ºC) of table value; if too
low, decrease the indoor fan speed (refer to indoor unit for information). If the
Delta-T is too high, increase the indoor fan speed. Repeat charging procedure and
Delta-T (air flow adjustment) procedure until both are correct.
Example: assume entering air DB - 72, WB - 64, leaving DB - 53. Therefore,
Delta-T should be 15 (per table); delta across coil is 72 - 53 or 19 (which is 4ºF
higher than table value); action necessary: increase fan speed.
Table 4. Evaporator Coil Delta-T
Dry bulb 80 24 24 24 23 23 22 22 22 20 19 18 17 16 15
temperature 78 23 23 23 22 22 21 21 20 19 18 17 16 15 14
of air 76 22 22 22 21 21 20 19 19 18 17 16 15 14 13
entering 74 21 21 21 20 19 19 18 17 16 16 15 14 13 12
indoor 72 20 20 19 18 17 17 16 15 15 14 13 12 11 10
coil (ºF) 70 19 19 18 18 17 17 16 15 15 14 13 12 11 10
ºF 57 58 59 60 61 62 63 64 65 66 67 68 69 70
[ Wet bulb temperature of air entering indoor coil ]
Table 5. Superheat (SH) Value
RFC System - +5ºF
40
15 18 20 23 26 29 32 34 38 41 43 46 48 51
45 13 16 18 21 24 27 30 33 36 39 41 44 46 49
50 11 14 16 19 22 25 28 31 34 37 39 42 44 47
Dry bulb 55 9 12141720232730333638404244
temperature 66 7 10121518212427303335384043
of ambient 65 ‐ 6 10 13 16 19 21 24 27 30 33 36 38 41
air entering 70 ‐ ‐ 7 1013161921242730333639
outdoor 75 ‐ ‐ ‐ 6 9 12 15 18 21 24 28 31 34 37
unit (ºF) 80 ‐ ‐ ‐ ‐ 5 8 1215182125283135
85 ‐‐‐‐‐‐811151922263033
90 ‐ ‐ ‐ ‐ ‐ ‐ 5 9 13 16 20 24 27 31
95 ‐‐‐‐‐‐‐6101418222529
100 ‐‐‐‐‐‐‐‐81216212428
105 ‐‐‐‐‐‐‐‐5913172226
110 ‐‐‐‐‐‐‐‐‐611152025
115 ‐‐‐‐‐‐‐‐‐‐8141824
ºF 50 52 54 56 58 60 62 64 66 68 70 72 74 76
[ Wet bulb temperature of air entering indoor coil ]
*2P0810* *P580336-01*
08 /10 580336-01