Lennox EL196UHE Series Information page 44

2" Long Square Tubing
(remove for manifold adjustment)
Gas Valve Regulator
Vent Hose
(to burner box)
Barbed Fitting
E-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 table below. The maximum carbon
monoxide reading should not exceed 100 ppm.
TABLE 18
EL196 Unit CO2% Nat
-030
-045
-070
-090
-110
10" Long
Square
Tubing
Measuring Device
CO2% LP
7.5- 8.5 8.2 - 9.5
(−)
Tee
FIGURE 57
F-High Altitude
NOTE - In Canada, certification for installations at eleva-
tions over 4500 feet (1372 m) is the jurisdiction of local
authorities.
Some units installed at altitude of 4501 - 10,000 feet (1373
to 3048 m) may require a pressure switch change which
can be ordered separately and a manifold de-rate. See
TABLE 19 for manifold pressures at all altitudes. TABLE
20 lists conversion kit and pressure switch requirements
at varying altitudes.
The combustion air pressure switch is factory-set and re-
quires no adjustment.
Page 44
Negative Barbed Fitting
(remove for manifold adjustment)
(+)
Manifold Pressure Outlet