Page 45
(+)
(−)
Gas Valve Regulator
Vent Hose
(to burner box)
2” Long Square Tubing
(remove for manifold adjustment)
Tee
10” Long
Square
Tubing
Measuring Device
Barbed Fitting
Manifold Pressure Outlet
Negative Barbed Fitting
(remove for manifold adjustment)
FIGURE 57
G- Proper Combustion
Furnace should operate at least 15 minutes with correct
manifold pressure and gas flow rate before checking com
-
bustions. Take sample beyond the flue outlet and compare
to TABLE 18.
The maximum carbon monoxide reading
should not exceed 100 ppm.
TABLE 18
ML196UHE Unit
CO2% Nat
CO2% LP
-030
7.5- 8.5
8.2 - 9.5
-045
-070
-090
-110
-135
H- 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.
Summary of Contents for ML196UH030XE36B
Page 57: ...Page 57...
