Lennox EL280UHE Series Unit Information page 27
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Also See for EL280UHE Series:
- Installation instructions manual (44 pages) ,
- Service literature (45 pages) ,
- Unit information (47 pages)
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G- Proper Combustion
Furnace should operate minimum 15 minutes with correct
manifold pressure and gas flow rate before checking com
bustion. See sections E- and F-. Take combustion sample
beyond the flue outlet. Table 13 shows acceptable com
bustion for ALL EL280UHE(X) models. The maximum
carbon monoxide reading should not exceed 100 ppm.
TABLE 13
Firing Rate
High Fire
Low Fire
Unit
Gas
Input
Low Fire
Natural
045
3
LP/propane
Natural
070
LP/propane
3
Natural
090
3
LP/propane
Natural
110
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.
045
070
No
91W53
Change
090
110
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.
CO
%
CO
%
2
For Nat
2
For L.P.
6.0 - 7.5
7.0 - 8.5
5.0 - 6.5
5.8 - 7.3
Manifold Pressure Settings at all Altitudes
Manifold
Pressure in.wg.
0-4500 ft.
High Fire
1.7
3.5
4.5
10.0
1.7
3.5
4.5
10.0
1.7
3.5
4.5
10.0
1.7
3.5
4.5
10.0
Pressure Switch and Gas Conversion Kits at all Altitudes
7501 - 10,000 ft.
73W35
H- High Altitude
The manifold pressure may require adjustment and com
bustion air pressure switch may need replacing to ensure
proper combustion at higher altitudes. Refer to table 14 for
manifold pressure and table 15 for pressure switch change
and gas conversion kits.
TABLE 14
Manifold
Pressure in.wg.
1
4501-7500 ft.
Low Fire
High Fire
1.5
3.2
4.5
10.0
1.5
3.2
4.5
10.0
1.5
3.2
4.5
10.0
1.5
3.2
4.5
10.0
TABLE 15
High Altitude
Natural Gas Kit
7501 - 10,000 ft.
0 - 7500 ft
73W37
Page 27
Manifold
Pressure in.wg.
2
7501 - 10,000 ft.
Low Fire
High Fire
1.7
3.5
4.5
10.0
1.7
3.5
4.5
10.0
1.7
3.5
4.5
10.0
1.7
3.5
4.5
10.0
LP/Propane Gas Kit
7501 - 10,000 ft.
11K51
11K46
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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