Lennox LGH092H User Manual

Page 28
E-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,
reclaim 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
operating.
3- Use a thermometer to accurately measure the
outdoor ambient temperature.
4- Apply the outdoor temperature to tables 10 through
16 to determine normal operating pressures.
Pressures are listed for sea level applications at
80
5F dry bulb and 675F wet bulb return air.
5- Compare the normal operating pressures to the
pressures 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.
 Add or remove charge in increments.
 Allow the system to stabilize each time
refrigerant is added or removed.
7- Use the following approach method along with the
normal operating pressures to confirm readings.
TABLE 10
LGH/LCH092H Fin/Tube - 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 11
LGH/LCH092H Fin/Tube 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 12
LGH/LCH102H Fin/Tube - 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 13
LGH/LCH102H Fin/Tube 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

Lennox LGH092H Specifications

General

Brand	Lennox
Model	LGH092H
Category	Air Conditioner
Language	English