Lennox LGM Series Manual page 37

TABLE 14 581030-01
LGM/LCM102U Reheat
Circuit 1
Outdoor
Dis­
Coil
Suction
Entering
charge
+5 psig
Air Temp
+10 psig
655 F 264
755 F 301
855 F 349
955 F 399
1055 F 450
1155 F 508
TABLE 15 581031-01
LGM/LCM120U No Reheat
Circuit 1
Outdoor
Dis­
Coil
Suction
Entering
charge
+5 psig
Air Temp
+10 psig
655 F 258
755 F 296
855 F 337
955 F 383
1055 F 439
1155 F 490
TABLE 16 581032-01
LGM/LCM120U Reheat
Circuit 1
Outdoor
Coil Dis­
Suction
Entering
charge
+5 psig
Air Temp
+10 psig
655 F 272
755 F 309
855 F 350
955 F 396
1055 F 452
1155 F 503
TABLE 17 581033-01
LGM/LCM150U No Reheat
Circuit 1
Outdoor
Coil Dis­
Suction
Entering
charge
+5 psig
Air Temp
+10 psig
655 F 267
755 F 308
855 F 355
955 F 399
1055 F 448
1155 F 503
Circuit 2
Dis­
Suction
charge
+5 psig
+10 psig
140 266 137
139 300 139
141 341 141
144 390 144
146 440 147
149 494 150
Circuit 2
Dis­
Suction
charge
+5 psig
+10 psig
132 263 131
137 302 133
139 344 135
141 389 137
142 438 140
145 494 143
Circuit 2
Dis­
Suction
charge
+5 psig
+10 psig
131 255 133
135 294 135
138 335 137
139 381 139
141 430 142
144 485 145
Circuit 2
Dis­
Suction
charge
+5 psig
+10 psig
122 270 113
128 313 120
133 363 127
136 407 130
139 456 132
142 510 136
TABLE 18 581034-01
LGM/LCM150U Reheat
Outdoor
Dis­
Coil
charge
Entering
+10 psig
Air Temp
655 F 313
755 F 353
855 F 401
955 F 445
1055 F 493
1155 F 548
Charge Verification - Subcooling Method - AHRI Test­
ing
1-
Attach gauge manifolds to discharge and suction lines. With
the economizer disabled, operate the unit in cooling mode
at high speed using the following mobile service app menu
path:
RTU MENU > SERVICE > COMPONENT TEST > COOLING
2- Use the liquid line pressure and a PT chart to determine
the saturated liquid temperature.
3- Measure the liquid line temperature at the condenser
outlet.
Subcooling Temperature = Liquid Saturated Tempera­
ture Minus Liquid Temperature.
4-
Refer to table 19 for subcooling temperatures. A subcooling
temperature greater than this value indicates an overcharge.
A subcooling temperature less than this value indicates an
undercharge.
SUBCOOLING TEMPERATURE
Unit
12°F + 1 (6.7°C +
092
17°F + 1 (9.4°C +
092 Reheat
11°F + 1 (6.1°C +
102
19°F + 1 (6.7°C +
102 Reheat
120 9°F + 1 (5.0°C + 0.5)
15°F + 1 (8.3°C +
120 Reheat
10°F + 1 (5.6°C +
150
22°F + 1 (12°C +
150 Reheat
Page 37
CIRCUIT 1 CIRCUIT 2
Dis­
Suction
charge
+5 psig +10 psig
123 259
129 302
134 351
137 396
140 445
143 499
>COOL 4
TABLE 19
Liquid Temp. Minus Ambient Temp.
1st Stage 2nd Stage
15°F + 1 (8.3°C + 0.5)
0.5)
15°F + 1 (8.3°C + 0.5)
0.5)
14°F + 1 (7.7°C + 0.5)
0.5)
14°F + 1 (7.7°C + 0.5)
0.5)
13°F + 1 (7.2°C + 0.5)
8°F + 1 (4.4°C + 0.5)
0.5)
11°F + 1 (6.1°C + 0.5)
0.5)
8°F + 1 (4.4°C + 0.5)
0.5)
Suction
+5 psig
113
121
127
130
133
137