Lennox EL280UH Installation Instructions Manual page 34
Elite series gas furnace upflow / horizontal air discharge
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Also See for EL280UH:
- User's information manual (7 pages) ,
- Installation instructions manual (38 pages)
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Unit
Gas
Input
Low Fire
Natural
070
3
LP/propane
Natural
090
LP/propane
3
Natural
110
3
LP/propane
Natural
135
3
LP/propane
1
This is the only permissible derate for these units.
2
Natural gas high altitude orifice kit required.
3
A natural to L.P. propane gas changeover kit is necessary to convert this unit. Refer to the changeover kit installation instruction for the conversion
procedure.
NOTE − Units may be installed at altitudes up to 4500 ft. above sea level without modifications.
High Altitude Pressure Switch Kit
Unit
Input
0 − 4500 ft.
4501 − 7500 ft.
070
090
No Change
110
135
NOTE − A natural to L.P. propane gas changeover kit is necessary to convert this unit. Refer to the changeover kit installation instruction for the conversion
procedure.
Manifold Pressure Settings at all Altitudes
Manifold
Pressure in.wg.
0−4500 ft.
High Fire
1.7
3.5
4.9
10.0
1.7
3.5
4.9
10.0
1.7
3.5
4.9
10.0
1.7
3.5
4.9
10.0
Pressure Switch and Gas Conversion Kits at all Altitudes
7501 − 10,000 ft.
91W53
73W35
91W53
73W35
91W53
73W35
73W33
73W34
TABLE 14
Manifold
Pressure in.wg.
1
4501−7500 ft.
Low Fire
High Fire
1.6
3.4
4.9
10.0
1.5
3.2
4.9
10.0
1.5
3.2
4.9
10.0
1.5
2.8
4.9
10.0
TABLE 15
High Altitude
Natural Gas Kit
7501 − 10,000 ft.
73W37
Page 34
Manifold
Pressure in.wg.
2
7501 − 10,000 ft.
Low Fire
High Fire
1.7
3.5
4.9
10.0
1.7
3.5
4.9
10.0
1.7
3.5
4.9
10.0
1.7
3.5
4.9
10.0
LP/Propane Gas Kit
0 − 7500 ft
7501 − 10,000 ft.
77W07
77W11
Supply Line
Pressure
in. w.g.
Min
Max
4.5
13.0
11.0
13.0
4.5
13.0
11.0
13.0
4.5
13.0
11.0
13.0
4.5
13.0
11.0
13.0
LP/Propane to
Natural Kit
0 − 7500 ft.Min
77W09
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