Lennox LGH092H4M User Manual

Page 51
B-Refrigerant Charge and Check - Fin/Tube Coil - TXV
LGH/LCH092H, 102H, 120H, 150S
WARNING-Do not exceed nameplate charge under any
condition.
This unit is factory charged and should require no further
adjustment. If the system requires additional refrigerant, re
claim the charge, evacuate the system, and add required
nameplate charge.
NOTE - System charging is not recommended below 60°F
(15°C). In temperatures below 60°F (15°C) , the charge
must be weighed into the system.
If weighing facilities are not available, or to check the
charge, use the following procedure:
IMPORTANT - Charge unit in standard cooling mode.
1- Attach gauge manifolds and operate unit in cooling
mode with economizer disabled until system stabilizes
(approximately five minutes). Make sure outdoor air
dampers are closed.
2- Check each system separately with all stages operat
ing.
3- Use a thermometer to accurately measure the outdoor
ambient temperature.
4- Apply the outdoor temperature to tables 9 through 16
to determine normal operating pressures. Pressures
are listed for sea level applications at 80
5F dry bulb
and 67
5F wet bulb return air.
5- Compare the normal operating pressures to the pres
sures obtained from the gauges. Minor variations in
these pressures may be expected due to differences in
installations. Significant differences could mean that
the system is not properly charged or that a problem
exists with some component in the system. Correct
any system problems before proceeding.
6- If discharge pressure is high, remove refrigerant from
the system. If discharge pressure is low, add refrigerant
to the system.
S Add or remove charge in increments.
S Allow the system to stabilize each time refrigerant
is added or removed.
7- Use the following approach method along with the nor
mal operating pressures to confirm readings.
TABLE 9
LGH/LCH092H Fin/Tube Coil - TXV
Outdoor
Coil
Entering
Air Temp
CIRCUIT 1 CIRCUIT 2
Dis
charge
+
10 psig
Suction
+
5 psig
Dis
charge
+
10 psig
Suction
+
5 psig
655 F 240 142 257 141
755 F 277 143 292 142
855 F 317 145 333 145
955 F 362 148 378 147
1055 F 410 151 422 149
1155 F 460 154 472 152
TABLE 10
LGH/LCH092H Fin/Tube Coil Hot Gas Reheat - TXV
Outdoor
Coil
Entering
Air Temp
CIRCUIT 1 CIRCUIT 2
Dis
charge
+
10 psig
Suction
+
5 psig
Dis
charge
+
10 psig
Suction
+
5 psig
655 F 247 140 257 141
755 F 284 142 294 144
855 F 324 144 334 147
955 F 367 145 375 149
1055 F 417 147 423 152
1155 F 468 150 469 154
TABLE 11
LGH/LCH102H Fin/Tube Coil - TXV
Outdoor
Coil
Entering
Air Temp
CIRCUIT 1 CIRCUIT 2
Dis
charge
+
10 psig
Suction
+
5 psig
Dis
charge
+
10 psig
Suction
+
5 psig
655 F 245 142 262 142
755 F 281 144 298 144
855 F 322 146 341 146
955 F 367 149 384 148
1055 F 415 152 430 150
1155 F 465 154 475 153
TABLE 12
LGH/LCH102H Fin/Tube Coil Hot Gas Reheat - TXV
Outdoor
Coil
Entering
Air Temp
CIRCUIT 1 CIRCUIT 2
Dis
charge
+
10 psig
Suction
+
5 psig
Dis
charge
+
10 psig
Suction
+
5 psig
655 F 250 140 262 141
755 F 289 143 301 144
855 F 328 145 339 147
955 F 374 147 382 150
1055 F 425 149 429 153
1155 F 478 151 473 155
TABLE 13
LGH/LCH120H Fin/Tube Coil - TXV
Outdoor
Coil
Entering
Air Temp
CIRCUIT 1 CIRCUIT 2
Dis
charge
+
10 psig
Suction
+
5 psig
Dis
charge
+
10 psig
Suction
+
5 psig
655 F 259 137 283 139
755 F 297 140 321 142
855 F 338 143 360 144
955 F 382 146 406 146
1055 F 431 149 453 148
1155 F 486 151 505 151
TABLE 14
LGH/LCH120H Fin/Tube Coil Hot Gas Reheat - TXV
Outdoor
Coil
Entering
Air Temp
CIRCUIT 1 CIRCUIT 2
Dis
charge
+
10 psig
Suction
+
5 psig
Dis
charge
+
10 psig
Suction
+
5 psig
655 F 266 134 281 139
755 F 303 137 310 141
855 F 344 140 358 143
955 F 391 143 403 145
1055 F 443 146 450 146
1155 F 499 149 497 148

Lennox LGH092H4M Specifications

General

Brand	Lennox
Model	LGH092H4M
Category	Air Handlers
Language	English