Page 44
FIGURE 57
(+)
(−)
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)
MANIFOLD PRESSURE CHECK SET UP
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
CO
2
%
For
Nat
CO
2
%
For
LP
All 7.5 - 8.5 8.2 - 9.5
The maximum carbon monoxide reading should not exceed 100 ppm.
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.
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