Proper Combustion; High Altitude - Lennox EL296UHE Installation Instructions Manual

Proper Combustion

Furnace should operate minimum 15 minutes with correct
manifold pressure and gas flow rate before checking com­
bustion. Take combustion sample beyond the flue outlet
and compare to the tables below.
TABLE 16
CO %
EL296
2 For Nat
Model
Low Fire High Fire
045 5.4 - 6.4 7.5 - 8.5
070 5.3 - 6.3 7.4 - 8.4
090 5.8 - 6.8 7.6 - 8.6
110 6.1 - 7.1 8.0 - 9.0
135 6.1 - 7.1 7.8 - 8.8
The maximum carbon monoxide reading should not exceed 50 ppm.
EL296
Unit
All Sizes
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.
LP/Propane Conversion Kit and Pressure Switch Requirements at Varying Altitudes
Natural to
LP/Propane
EL296
Unit
0 - 7500 ft
(0 - 2286m)
-045
-070
-090
*78W93
-110
-135
* Conversion requires installation of a gas valve manifold spring which is provided with the gas conversion kit.
Pressure switch is factory set. No adjustment necessary. All models use the factory-installed pressure switch from 0-4500 feet (0-1370 m).
CO %
2 For L.P
Low Fire High Fire
6.4 - 7.4 8.8 - 9.8
6.3 - 7.3 8.7 - 9.7
6.8 - 7.8 8.9 - 9.9
7.1 - 8.1 9.3 - 10.3
7.1 - 8.2 9.1 - 10.1
Manifold and Supply Line Pressure 0-10,000ft.
Manifold Pressure in.wg.
Gas
Low Fire
Natural 1.7
LP/propane 4.9

High Altitude

Natural Burner
Orifice Kit
7501 - 10,000 ft
(2286 - 3038m)
73W37
High Altitude Information
NOTE - In Canada, certification for installations at eleva­
tions over 4500 feet (1372 m) is the jurisdiction of local au­
thorities.
Units may be installed at altitudes up to 10,000 ft. above
sea level without manifold adjustment. Units installed at al­
titude of 4501 - 10,000 feet (1373 to 3048m) may require a
pressure switch change which can be ordered separately.
Table 18 lists conversion kit and pressure switch require­
ments at varying altitudes.
The combustion air pressure switch is factory-set and re­
quires no adjustment.
TABLE 17
High Fire
3.5
10.0
TABLE 18
High Altitude
LP/Propane Burner
Orifice Kit
7501 - 10,000 ft
(2286 - 3038m)
*78W96
Page 51
Supply Line Pressure in. w.g.
Min
4.5
11.0
High Altitude Pressure Switch
4501 - 7500 ft 7501 -10,000 ft
(1373 - 2286m) (2286 - 3048m)
93W81 93W84
93W80 93W85
93W82 93W80
93W80 93W85
93W83 93W85
Max
10.5
13.0