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SPECIFICATIONS GAS HEAT
Usage Data Model Number LDT156
LDT180
LDT156
LDT180
LDT240
LDT180
LDT240
Heat Input Type
One
¹ Gas Heating
Performance
- - -
- - -
- - -
- - - - - - - - -
- - - - - - - - - - - -
- - - - - - - - - - - -
- - -
15-45 15-45 40-70
- - - - - - - - - - - -
Minimum Air Volume - cfm 4500 4500 4500 5125
80% 81% 81% 81%
1 in. NPT 1 in. NPT 1 in. NPT 1 in. NPT
Natural 7 7 7 7
LPG/Propane 11 11 11 11
Pressure Range
1
®
HIGH ALTITUDE DERATE
NOTE - Units may be installed at altitudes up to 2000 feet above sea level without any modication.
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
No Adjustment Required
TWO STAGE HEAT
Heat Input Type Altitude Feet
Gas Manifold Pressure - in. w.g.
Natural Gas LPG/Propane Gas First Stage Second Stage
2001 - 4500
2001 - 4500
2001 - 4500
FOUR STAGE HEAT
¹ Heat Input Type Altitude Feet
Gas Manifold Pressure - in. w.g.
Natural Gas LPG/Propane Gas
First
Stage
Second
Stage
Third
Stage
Fourth
Stage
2001 - 4500
2001 - 4500
2001 - 4500
1
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