Lennox LGM156U Installation Instructions Manual page 22

TABLE 10
210 Reheat Compressor 1 Frequency 48Hz - 581019-01
Outdoor
Circuit 1 Circuit 2
Coil En­
tering
Dis Suc Dis.
Air
+10 +5 +10
psig psig psig
Temp
65°F 245 127 267
75°F 279 130 303
85°F 317 133 344
95°F 367 136 393
105°F 407 139 438
115°F 461 143 492
TABLE 11
240 Std. Compressor 1 Frequency 62Hz - 581020-01
Outdoor
Circuit 1 Circuit 2
Coil En­
tering
Dis Suc Dis.
Air
+10 +5 +10
psig psig psig
Temp
65°F 250 117 261
75°F 289 121 301
85°F 331 124 348
95°F 374 126 393
105°F 425 130 450
115°F 481 133 507
TABLE 12
240 Reheat Compressor 1 Frequency 62Hz - 581021-01
Outdoor
Circuit 1 Circuit 2
Coil En­
tering
Dis Suc Dis.
Air
+10 +5 +10
psig psig psig
Temp
65°F 263 122 296
75°F 304 126 336
85°F 348 129 384
95°F 387 129 405
105°F 442 133 464
115°F 500 137 523
TABLE 13
300 Std. Compressor 1 Frequency 68Hz - 581022-01
Outdoor
Circuit 1 Circuit 2
Coil En­
tering
Dis Suc Dis.
Air
+10 +5 +10
psig psig psig
Temp
65°F 260 115 260
75°F 301 118 304
85°F 345 121 350
95°F 387 126 407
105°F 437 128 460
115°F 490 131 519
LGM/LCM156, 180, 210, 240, 300
Circuit 3 Circuit 4
Suc Dis. Suc Dis. Suc.
+5 +10 +5 +10 +5
psig psig psig psig psig
126 241 120 264 141
129 279 129 301 146
132 318 136 342 149
134 365 143 391 152
138 409 147 438 155
141 462 151 493 159
Circuit 3 Circuit 4
Suc Dis. Suc Dis. Suc.
+5 +10 +5 +10 +5
psig psig psig psig psig
124 252 129 267 139
128 292 136 310 146
131 334 140 355 151
134 379 142 400 154
138 430 145 456 158
141 484 148 514 161
Circuit 3 Circuit 4
Suc Dis. Suc Dis. Suc.
+5 +10 +5 +10 +5
psig psig psig psig psig
126 239 126 273 140
126 276 133 312 144
128 318 138 357 148
129 373 140 389 148
133 424 144 440 151
136 477 147 497 152
Circuit 3 Circuit 4
Suc Dis. Suc Dis. Suc.
+5 +10 +5 +10 +5
psig psig psig psig psig
118 272 117 269 119
124 316 126 314 130
127 362 133 360 138
130 403 138 412 145
134 455 141 466 149
137 510 144 522 154
300 Reheat Compressor 1 Frequency 68Hz - 581023-01
Outdoor
Circuit 1
Coil En­
tering
Dis Suc
Air +10
Temp psig psig
65°F 274 121
75°F 316 124
85°F 363 126
95°F 415 129
105°F 469 132
115°F 525 136
E-Charge Verification - Approach Method - AHRI
Testing (Fin/Tube Coil)
1- Using the same thermometer, compare liquid
temperature to outdoor ambient temperature.
Approach Temperature = Liquid temperature (at
condenser outlet) minus ambient temperature.
2- Approach temperature should match values in table
15. An approach temperature greater than value
shown indicates an undercharge. An approach
temperature less than value shown indicates an
overcharge.
3- The approach method is not valid for grossly over or
undercharged systems.
guide for typical operating pressures.
APPROACH TEMPERATURES - FIN/TUBE COIL
Unit
1st Stage
3.0°F + 1
156 Std.
(1.7°C +0.5)
156 1.7°F+1
Reheat (0.9°C+0.5)
2.5°F + 1
180 Std.
(1.4°C +0.5)
180 1.0°F + 1
Reheat (0.6°C +0.5)
1.0°F + 1
210 Std.
(0.6°C +0.5)
210 2.5°F + 1
Reheat (1.4°C +0.5)
3.5°F + 1
240 Std.
(1.9°C +0.5)
240 1.9°F + 1
Reheat (1.1°C +0.5)
1.5°F+1
300 Std.
(0.8°C+0.5)
300 2.8°F+1
Reheat (1.5°C+0.5)
Page 22
TABLE 14
Circuit 2 Circuit 3
Dis. Suc Dis. Suc
+5 +10 +5 +10 +5
psig psig psig psig
295 120 259 114
339 122 301 123
387 124 346 131
442 127 395 137
497 130 447 142
558 133 502 145
5 through 14
Use tables
TABLE 15
Liquid Temp. Minus Ambient Temp.
2nd Stage 3rd Stage
6.0°F + 1 6.5°F + 1
(3.3°C +0.5) (3.6°C +0.5)
1.7°F+1 2.7°F+1
(0.9°C+0.5) (1.5°C+0.5)
5.0°F + 1 5.5°F + 1
(2.8°C +0.5) (3.1°C +0.5)
2.8°F + 1 4.8°F + 1
(1.6°C +0.5) (2.7°C +0.5)
5.5°F + 1 3.0°F + 1
(3.1°C +0.5) (1.7°C +0.5)
3.7°F + 1 6.0°F + 1
(2.1°C +0.5) (3.3°C +0.5)
8.3°F + 1 4.7°F + 1
(4.6°C +0.5) (2.6°C +0.5)
3.8°F + 1 2.2°F + 1
(2.1°C +0.5) (1.2°C +0.5)
5.5°F+1 4.0°F+1
(3.1°C+0.5) (2.2°C+0.5)
4.2°F+1 3.8°F+1
(2.3°C+0.5) (2.1°C+0.5)
Circuit 4
Dis. Suc.
+10 +5
psig psig
275 120
317 128
362 135
414 141
464 144
519 147
as a
4th Stage
NA
NA
NA
NA
6.0°F + 1
(3.3°C +0.5)
4.3°F + 1
(2.4°C +0.5)
7.5°F + 1
(4.2°C +0.5)
5.4°F + 1
(3.0°C +0.5)
6.5°F+1
(3.6°C+0.5)
5.4°F+1
(3.0°C+0.5)