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Proper Combustion
Furnace should operate minimum 15 minutes with correct
manifold pressure and gas flow rate before checking com-
bustion. Table 12 shows acceptable combustion for ALL
EL280DF models. The maximum carbon monoxide
reading should not exceed 50 ppm
TABLE 12
Firing Rate
High Fire
Low Fire
Unit
Gas
Input
Low Fire
Natural
070
3
LP/propane
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.
070
090
No Change
No Change
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.
6.8 − 7.4
7.5 − 9.0
4.2 − 5.7
5.0 − 6.0
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
Pressure Switch and Gas Conversion Kits at all Altitudes
7501 − 10,000 ft.
73W36
73W36
73W35
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 13 for
manifold pressure and table 14 for pressure switch change
and gas conversion kits.
For safety, shut unit off and remove manometer as
soon as an accurate reading has been obtained.
Take care to replace pressure tap plug.
TABLE 13
Manifold
Pressure in.wg.
1
4501−7500 ft.
Low Fire
High Fire
1.5
3.2
4.9
10.0
1.5
3.0
4.9
10.0
1.5
3.2
4.9
10.0
TABLE 14
High Altitude
Natural Gas Kit
7501 − 10,000 ft.
73W37
Page 26
IMPORTANT
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
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
LP/Propane to
Natural Kit
0 − 7500 ft.Min
77W09
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