Gas Heat Specifications / High Altitude - Lennox Enlight LGT Series Manual

SP ECIF ICATIONS
Usage Data
Number of Gas Heat Stages
¹ Gas Heating Input - Btuh
Performance
Output - Btuh
Temperature Rise Range - °F
Minimum Air Volume - cfm
Thermal Efficiency
Gas Supply Connections
Recommended Gas Supply
Pressure - in. w.g.
Gas Supply
Pressure Range
Two-stage heat models can be operated with four stages of gas heating when controlled in either zone sensor, Discharge Air Control, or fresh air tempering mode on
1
the Lennox CORE unit controller (available when using the CS8500 thermostat or when connected to Building Automation Systems using BACnet, LonTalk, or S-Bus
®
protocols).
HIG H ALTITU DE D ERATE
NOTE - Units may be installed at altitudes up to 2000 feet above sea level without any modification.
At altitudes above 2000 feet, units must be derated to match gas manifold pressures shown
in table below.
At altitudes above 4500 feet units must be derated 4% for each 1000 feet above sea level.
NOTE − This is the only permissible derate for these units.
Refer to the Installation Instructions for more detailed information.
ONE STAGE HEAT
TWO STAGE HEAT
Heat Input Type Altitude Feet
Standard (2 stage) 2001 - 4500
Medium (2 stage) 2001 - 4500
High (2 stage) 2001 - 4500
FOUR STAGE HEAT
¹ Heat Input Type Altitude Feet
Standard (4 stage) 2001 - 4500
Medium (4 stage) 2001 - 4500
High (4 stage) 2001 - 4500
Four-Stage Gas Heating is field configured.
1
Model Number
Heat Input Type
First Stage
Second Stage
Third Stage
Fourth Stage
First Stage
Second Stage
Third Stage
Fourth Stage
First Stage
Second Stage
1 in. NPT
Natural
LPG/Propane
Min./Max. (Natural)
Min./Max. (LPG)
No Adjustment Required
Gas Manifold Pressure - in. w.g.
Natural Gas
1.6 / 3.1
1.6 / 3.1
1.6 / 3.1
Gas Manifold Pressure - in. w.g.
Natural Gas
1.6 / 3.1
1.6 / 3.1
1.6 / 3.1
LGT156
LGT180
LGT210
Low (L) Standard (S)
One ¹ Two
169,000 85,000
- - - 169,000
- - - 214,000
- - - 260,000
135,000 - - -
- - - - - -
- - - - - -
- - - 211,000
15-45 15-45
- - - - - -
4500 4500
80% 81%
1 in. NPT
7 7
11 11
LPG/Propane Gas
4.4 / 8.9
4.4 / 8.9
4.4 / 8.9
LPG/Propane Gas
4.4 / 8.9
4.4 / 8.9
4.4 / 8.9
Page 11
LGT156
LGT180
LGT210
LGT240
LGT300
Medium (M)
¹ Two
117,000
234,000
297,000
360,000
- - -
- - -
- - -
292,000
30-60
- - -
4500
81%
1 in. NPT
7
11
4.7 - 10.5 in. w.g.
10.8 - 13.5 in.w.g.
Input Rate (Btuh)
First Stage
169,000
234,000
312,000
Input Rate (Btuh)
First Second
Stage Stage
85,000 169,000
117,000 234,000
156,000 312,000
G A S HEAT
LGT180
LGT210
LGT240
LGT300
High (H)
¹ Two
156,000
312,000
396,000
480,000
- - -
- - -
- - -
389,000
40-70
- - -
5125
81%
1 in. NPT
7
11
Second Stage
239,000
331,000
442,000
Third Fourth
Stage Stage
204,000 239,000
283,000 331,000
377,000 442,000