Page 44
FIGURE 56
(+)
(−)
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 17
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 18 for manifold pressures at all altitudes. Table 19 lists
conversion kit and pressure switch requirements at varying
altitudes.
The combustion air pressure switch is factory-set and re
quires no adjustment.
TABLE 18
Manifold and Supply Line Pressure 0-10,000ft.
ML196
Unit
Gas
Manifold Pressure in. wg.
Supply Line
Pressure
in. w.g.
0 - 10000 ft.
0-4500 ft.
4501-5500
ft.
5501-6500
ft.
6501 - 7500ft. 7501 - 10000ft.
All
Sizes
Natural 3.5 3.3 3.2 3.1 3.5 4.5 13.0
LP/propane 10.0 9.4 9.1 8.9 10.0 11.0 13.0
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.
To Next Page
Loading...
Need help?
General