Heating Start Up - Lennox LGA Series Unit Information

TABLE 17
LGC/LCC Series 360 R410A − VAV
CIRCUIT 1 CIRCUIT 2
Outdoor
Coil En-
DIs Suc Dis
+10 +5 +10
tering Air
psig psig psig
Temp
65_F* 260 115 255
75_F 315 119 310
85_F 360 122 360
95_F 415 126 410
105_F 460 130 465
115_F 515 134 515
*Outdoor fans may cycle on and off at this temperature.
TABLE 18
LGA/LCA360H CAV with 3 compressors − R22
CIRCUIT 1
Outdoor
Coil En-
DIs Suc
+10 +5
tering Air
psig psig
Temp
65_F* 164 63
75_F 191 64
85_F 219 66
95_F 250 68
105_F 284 70
115_F 320 72
*Outdoor fans may cycle on and off at this temperature.
TABLE 19
LGA/LCA360H CAV with 3 compressors R410A
CIRCUIT 1
Outdoor
Coil En-
DIs Suc
tering Air +10 +5
psig psig
Temp
65_F* 286 111
75_F 320 115
85_F 363 119
95_F 413 122
105_F 465 126
115_F 523 130
*Outdoor fans may cycle on and off at this temperature.
D−Charge Verification − Approach Method
1− Using the same thermometer, compare liquid temper-
ature to outdoor ambient temperature.
Approach Temperature = Liquid temperature minus
ambient temperature.
2− Approach temperature should match values in table
20. An approach temperature greater than value
shown indicates an undercharge. An approach tem-
perature less than value shown indicates an over-
charge.
3− Do not use the approach method if system pressures
do not match pressures in tables 6 through 19. The ap-
proach method is not valid for grossly over or under-
charged systems.
CIRCUIT 3 CIRCUIT 4
Suc DIs Suc DIs Suc
+5 +10 +5 +10
psig psig psig psig psig
122 270 124 280 123
125 330 127 330 126
129 380 130 390 129
132 430 133 440 133
136 480 136 490 136
139 535 139 550 140
CIRCUIT 2 CIRCUIT 3
Dis Suc DIs Suc
+10 +5 +10 +5
psig psig psig psig
176 76 178 75
207 77 206 76
233 78 234 77
270 80 271 78
303 81 301 79
346 82 345 81
CIRCUIT 2 CIRCUIT 3
Dis Suc DIs Suc
+10 +5 +10 +5
psig psig psig psig
307 125 302 123
351 130 336 129
397 132 382 133
448 135 430 137
501 137 478 140
561 142 534 141
Liquid Temp. Minus Ambient Temp.
Unit
1st Stage
248 R22
8°F+1
+5
CAV/VAV
(4.4°C+0.5)
248
R410A 8°F+1
CAV
(4.4°C+0.5)
248
R410A 7°F+1
VAV
(3.9°C+0.5)
300H
6°F+1
R22 CAV
(3.3°C+0.5)
300H
6°F+1
R22 VAV
(3.3°C+0.5)
300H
R410A 8°F+1
CAV
(4.4°C+0.5)
300H
5
R410A °F+1
VAV
(2.8°C+0.5)
360
6°F+1
R22 CAV
(3.3°C+0.5)
360
8°F+1
R22 VAV
(4.4°C+0.5)
360
R410A 8°F+1
VAV
(4.4°C+0.5)
360
7°F+1
R410A
(3.9+0.5)
CAV
8°F + 1
360H
(4.4'°C +
R22
0.5)
12°F + 1
360H
(6.7°C +
R410A
0.5)
E−Heating Start Up
FOR YOUR SAFETY READ BEFORE LIGHTING
BEFORE LIGHTING smell all around the appliance area
for gas. Be sure to smell next to the floor because some gas
is heavier than air and will settle on the floor.
Use only your hand to push in or turn the gas control knob.
Never use tools. If the knob will not push in or turn by hand,
do not try to repair it, call a qualified service technician.
Force or attempted repair may result in a fire or explosion.
Electric shock hazard. Can cause
injury or death. Before attempting to
perform any service or maintenance,
turn the electrical power to unit OFF at
disconnect switch(es). Unit may have
multiple power supplies.
Page 55
TABLE 20
2nd Stage 3rd Stage 4th Stage
8°F+1 8°F+1 8°F+1
(4.4°C+0.5) (4.4°C+0.5) (4.4°C+0.5)
8°F+1 8°F+1 8°F+1
(4.4°C+0.5) (4.4°C+0.5) (4.4°C+0.5)
7°F+1 7°F+1 7°F+1
(3.9°C+0.5) (3.9°C+0.5) (3.9°C+0.5)
7°F+1 6°F+1 6°F+1
(3.9°C+0.5) (3.3°C+0.5) (3.3°C+0.5)
6°F+1 7°F+1 9°F+1
(3.3°C+0.5) (3.9+0.5) (5.0+0.5)
8°F+1 8°F+1 8°F+1
(4.4°C+0.5) (4.4°C+0.5) (4.4°C+0.5)
5 5
°F+1 °F+1 8°F+1
(2.8°C+0.5) (2.8°C+0.5) (4.4°C+0.5)
6°F+1 7°F+1 8°F+1
(3.3°C+0.5) (3.9+0.5) (4.4°C+0.5)
8°F+1 8°F+1 10°F+1
(4.4°C+0.5) (4.4°C+0.5) (5.6°C+0.5)
8°F+1 8°F+1 10°F+1
(4.4°C+0.5) (4.4°C+0.5) (5.6°C+0.5)
7°F+1 8°F+1 8°F+1
(3.9+0.5) (4.4°C+0.5) (4.4°C+0.5)
10°F + 1 8°F + 1
(5.6°C + (4.4°C +
NA
0.5) 0.5)
14°F + 1 13°F + 1
(7.8°C + (7.2°C +
NA
0.5) 0.5)
WARNING