Lennox LHT Series Information

Page 30
TABLE 3 581118-01
LHT078
Outdoor
Coil
Entering
Air Temp
CIRCUIT 1 CIRCUIT 2
Dis
charge
+
10 psig
Suction
+
5 psig
Dis
charge
+
10 psig
Suction
+
5 psig
65 °F 244 132 236 145
75 °F 281 134 271 146
85 °F 322 136 309 148
95 °F 366 138 354 150
105 °F 415 139 399 152
115 °F 464 141 449 154
TABLE 4 581119-01
LHT092
Outdoor
Coil
Entering
Air Temp
Circuit 1 Circuit 2
Dis
charge
+
10 psig
Suction
+
5 psig
Dis
charge
+
10 psig
Suction
+
5 psig
65 °F 250 139 253 139
75 °F 286 140 291 140
85 °F 326 141 331 141
95 °F 370 142 376 143
105 °F 417 144 426 146
115 °F 468 146 481 148
TABLE 5 581120-01
LHT102
Outdoor
Coil
Entering
Air Temp
Circuit 1 Circuit 2
Dis
charge
+
10 psig
Suction
+
5 psig
Dis
charge
+
10 psig
Suction
+
5 psig
65 °F 245 139 258 130
75 °F 283 142 296 133
85 °F 321 141 336 133
95 °F 370 146 389 138
105 °F 417 148 435 141
115 °F 469 151 492 144
TABLE 6 581121-01
LHT120
Outdoor
Coil
Entering
Air Temp
Circuit 1 Circuit 2
Dis
charge
+
10 psig
Suction
+
5 psig
Dis
charge
+
10 psig
Suction
+
5 psig
65 °F 248 126 256 125
75 °F 285 128 293 127
85 °F 326 130 334 129
95 °F 372 132 379 131
105 °F 420 135 426 134
115 °F 475 139 477 137
TABLE 7 581122-01
LHT150
Outdoor
Coil
Entering
Air Temp
CIRCUIT 1 CIRCUIT 2
Dis
charge
+
10 psig
Suction
+
5 psig
Dis
charge
+
10 psig
Suction
+
5 psig
65 °F 255 125 252 112
75 °F 295 128 293 124
85 °F 337 130 335 130
95 °F 382 134 381 133
105 °F 430 136 427 135
115 °F 485 139 476 137
B-Charging - Subcooling
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 >
COOL STAGE 3
2- Use the liquid line pressure and a PT chart to deter
mine 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 8 for subcooling temperatures. A subcooling
temperature greater than this value indicates an overcharge.
A subcooling temperature less than this value indicates an
undercharge.
TABLE 8
SUBCOOLING TEMPERATURE
Unit
Liquid Temp. Minus Ambient Temp.
1st Stage 2nd Stage
078 2°F + 1 (1.1°C + 0.5) 3°F + 1 (1.7°C + 0.5)
092, 102 2°F + 1 (1.1°C + 0.5) 5°F + 1 (2.8°C + 0.5)
120, 150 1°F + 1 (0.5°C + 0.5) 1°F + 1 (0.5°C + 0.5)

Lennox LHT Series Specifications

General

Brand	Lennox
Model	LHT Series
Category	Heat Pump
Language	English