Lennox EL196UH030XE24B 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 tables below.
TABLE 18
Unit
All
The maximum carbon monoxide reading should not exceed 100 ppm.
MANIFOLD PRESSURE CHECK SET UP
10" Long
Square
Tubing
Measuring Device
CO % CO %
2 For Nat 2 For LP
7.5 - 8.5 8.2 - 9.5
Negative Barbed Fitting
(remove for manifold adjustment)
(+)
(−)
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 au­
thorities.
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 ta­
ble 19 or 20 for manifold pressures at all altitudes. Table 21
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
Manifold Pressure Outlet