Lennox LGH120H4M User Manual

Page 51
B-Refrigerant Charge and Check - Fin/Tube Coil - TXV
LGH/LCH092H, 102H, 120H, 150S, 150H
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 18
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
65
o
F 235 137 262 137
75
o
F 272 139 298 141
85
o
F 312 142 338 144
95
o
F 357 146 380 146
105
o
F 407 149 428 149
115
o
F 460 154 477 153
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
65
o
F 242 134 262 139
75
o
F 279 137 297 143
85
o
F 319 140 338 146
95
o
F 364 143 379 148
105
o
F 414 146 427 151
115
o
F 467 151 476 155
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
65
o
F 241 139 273 141
75
o
F 277 141 307 144
85
o
F 318 143 348 147
95
o
F 362 145 389 149
105
o
F 411 148 437 151
115
o
F 464 150 486 152
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
65
o
F 249 137 272 142
75
o
F 285 139 306 145
85
o
F 327 141 347 148
95
o
F 370 143 389 150
105
o
F 420 146 436 152
115
o
F 473 148 485 154
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 LGH120H4M Specifications

General

Brand	Lennox
Model	LGH120H4M
Category	Air Handlers
Language	English