Lennox LGA Series Unit Information page 34

TABLE 15
LGA/LCA048S
Outdoor Coil
DIscharge
Entering
+10psig
Air Temp
65_F
75_F
85_F
95_F
105_F
115_F
TABLE 16
LGA/LCA060H
Outdoor Coil
DIscharge
Entering
+10psig
Air Temp
65_F
75_F
85_F
95_F
105_F
115_F
TABLE 17
LGA/LCA060S
Outdoor Coil
DIscharge
Entering
+10psig
Air Temp
65_F
75_F
85_F
95_F
105_F
115_F
Suction +5
psig
161 73
191 74
221 76
251 78
281 80
311 82
Suction +5
psig
165 75
192 76
221 78
253 80
287 82
323 83
Suction +5
psig
175 69
206 71
237 73
267 75
298 76
328 78
Page 34
TABLE 18
LGA/LCA072H
Outdoor Coil
Entering
Air Temp
65_F
75_F
85_F
95_F
105_F
115_F
TABLE 19
LGA/LCA072S
Outdoor Coil
Entering
Air Temp
65_F
75_F
85_F
95_F
105_F
115_F
Charge Verification - Sub-Cooling Method
If ambient temperature is above 60_F (15_C), read liquid line
temperature. Read liquid line pressure from gauge and con-
vert to condensing temperature using standard R-22 temper-
ature/pressure conversion chart (or conversion scale on
gauge). The difference between the condensing temperature
and the liquid line temperature is subcooling (subcooling =
condensing temperature minus liquid line temperature). The
subcooling should approximate the value given in table 20.
Add refrigerant to increase subcooling and remove refriger-
ant to reduce subcooling.
NOTE - Outdoor air dampers should be closed when
charging.
TABLE 20
SUBCOOLING
Unit
LGA/LCA036S, 036H, 042H, LGA/LCA036S, 036H, 042H,
048S, 048H, 072H 048S, 048H, 072H
LGA/LCA042S, 060H LGA/LCA042S, 060H
LGA/LCA060S
LGA/LCA072S
DIscharge Suction +5
+10psig psig
185 76
210 77
238 78
269 80
304 81
338 83
DIscharge Suction +5
+10psig psig
191 71
224 72
258 74
292 75
326 77
360 78
Circuit 2
10_F + 1(5.6_C + 1) 10_F + 1(5.6_C + 1)
11_F + 1(6.1_C + 1) 11_F + 1(6.1_C + 1)
16_F + 1(9_C + 1)
19_F + 1(11_C + 1)