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 15
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
0-4500 ft.
Gas
Unit
Low
Fire
Natural 1.7
All
Sizes
LP/propane 4.9
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.
4501-5500 ft.
High Low High Low
Fire Fire Fire
3.5 1.6 3.3
10.0 4.6 9.4

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. See table 16 for de-rate manifold values. Units
installed at altitude of 7501 - 10,000 feet require an orifice
change. Units installed at altitude of 4501 - 10,000 feet re­
quire a pressure switch change which can be ordered sep­
arately. Table 17 lists conversion kit and pressure switch
requirements at varying altitudes.
The combustion air pressure switch is factory-set and re­
quires no adjustment.
TABLE 16
5501-6500 ft. 6501 - 7500ft.
High Low High
Fire Fire Fire Fire
1.5 3.2 1.5
4.4 9.1 4.3
TABLE 17
High Altitude
LP/Propane Burner
Orifice Kit
7501 - 10,000 ft
(2286 - 3038m)
*78W96
Page 48
Supply Line
7501 - 10000ft.
Low High
Min
Fire Fire
3.1 1.7 3.5 4.5
8.9 4.9 10.0 11.0
High Altitude Pressure Switch
4501 - 7500 ft 7501 -10,000 ft
(1373 - 2286m) (2286 - 3048m)
93W81
11X65
11X72
93W80
93W83
Pressure
in. w.g.
0 - 10000 ft.
Max
13.0
13.0
93W84
98W79
11X65
93W85
93W85