SPECIFICATIONS - GAS HEAT
Usage Data Model Number LGM156
LGM180
LGM210
LGM156
LGM180
LGM210
LGM240
LGM300
LGM180
LGM210
LGM240
LGM300
Heat Input Type
Number of Gas Heat Stages 1 2 2 2
Gas Heating
Performance
Input - Btuh First Stage 234,000 312,000
Second Stage N/A 480,000
Output - Btuh First Stage 135,000 - - - - - - - - -
Second Stage N/A 208,000 288,000 384,000
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Gas Heating
Performance
Input - Btuh First Stage N/A 84,500 117,000
Second Stage N/A 234,000 312,000
Third Stage N/A 214,000
Fourth Stage N/A 480,000
Output - Btuh First Stage 135,000 - - - - - - - - -
Second Stage N/A - - - - - - - - -
Third Stage N/A - - - - - - - - -
Fourth Stage N/A 208,000 288,000 384,000
15 - 45 15 - 45 40 - 70
80.0% 80.0% 80.0% 80.0%
Gas Supply Connections 1 in. npt 1 in. npt 1 in. npt 1 in. npt
Recommended Gas Supply
Pressure - in. w.g.
Natural 7 7 7 7
LPG/Propane 11 11 11 11
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Four-stage gas heating is enabled when room sensor, Discharge Air Control, or fresh air tempering mode is selected. (Available when using the CS8500 thermostat or
when connected to Building Automation Systems using BACnet, LonTalk, or S-Bus protocols)
HIGH ALTITUDE DERATE
At altitudes above 2000 feet, units must be derated to match gas manifold pressures shown in table below.
At altitudes above 4500 feet unit must be derated 2% for each 1000 feet above sea level.
TWO-STAGE
Gas Heat
Type
Altitude - ft. Gas Manifold Pressure - in. w.g. Input Rate
Natural Gas or LPG/Propane - Btuh
Natural Gas LPG/Propane Gas First
Stage
Second
Stage
Low (L) No adjustment required
Standard (S) 2001 - 4500 3.4
Medium (M) 2001 - 4500 3.4 234,000 345,000
High (H) 2001 - 4500 3.4 312,000
FOUR-STAGE
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Gas Heat
Type
Altitude - ft. Gas Manifold Pressure - in. w.g. Input Rate
Natural Gas or LPG/Propane - Btuh
Natural Gas LPG/Propane Gas First
Stage
Second
Stage
Third
Stage
Fourth
Stage
Low (L) No adjustment required
Standard (S) 2001 - 4500 3.4 84,000
Medium (M) 2001 - 4500 3.4 117,000 234,000 345,000
High (H) 2001 - 4500 3.4 312,000
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