High Altitude - Lennox LGM Series Unit Information

SP ECIF ICATIONS
Input
Btuh
Output
Btuh
Temperature
Rise Range - °F
Thermal Efficiency
1
Gas Supply Connections
Recommended Gas Supply Pressure - Nat. / LPG
Gas Supply Pressure
Range
Thermal Efficiency at full input.
1
HIG H ALTITU DE D ERATE
NOTE - Units may be installed at altitudes
up to 2000 ft. above sea level without any
modifications. At altitudes above 2000 ft.
units must be derated to match information
in the table shown. At altitudes above 4500
ft. unit must be derated 2% for each 1000 ft.
above sea level.
NOTE - This is the only permissible derate
for these units.
Model No.
Heat Input Type Standard (2 Stage)
1st Stage
2nd Stage
1st Stage
2nd Stage
1st stage
2nd Stage
Min./Max. (Natural)
Min./Max. (LPG)
Heat Input Type
Standard (2 stage)
Medium (2 stage)
High (2 stage)
036, 048
060, 074
Medium (2 Stage)
53,000
65,000
43,000
52,000
5 - 35
15 - 45
81%
7 in. w.g. / 11 in. w.g.
4.5 - 10.5 in. w.g.
10.8 - 13.5 in. w.g.
Gas Manifold Pressure
Altitude Feet
Natural Gas LPG/Propane
2001 - 4500 3.0/1.7
2001 - 4500 3.0/1.7
2001 - 4500 3.0/1.7
Page 6
036, 048
060, 074
High (2 Stage)
81,000
108,000
66,000
87,000
25 - 55
30 - 70
81%
1/2 in. NPT
in. w.g.
Input Rate (Btuh)
9.0/5.1
9.0/5.1
9.0/5.1 139,000 / 104,000
G A S HEAT
048
060, 074
113,000
150,000
92,000
121,000
30 - 60
45 - 75
81%
60,000 / 49,000
100,000 / 75,000