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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 7.2 − 8.2 8.6 − 9.6
The maximum carbon monoxide reading should not exceed 50 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.
Units installed at altitude of 4501 − 10,000 feet (1373 to
3048 m) may require a pressure switch change which can
be ordered separately. 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 19
LP/Propane Conversion Kit and Pressure Switch Requirements at Varying Altitudes
Unit
Natural to
LP/Propane
High Altitude
Natural Burner
Orifice Kit
High Altitude
LP/Propane Burner
Orifice Kit
High Altitude Pressure Switch
0 − 7500 ft
(0 − 2286m)
7501 − 10,000 ft
(2286 − 3038m)
7501 − 10,000 ft
(2286 − 3038m)
4501 − 7500 ft
(1373 − 2286m)
7501 −10,000 ft
(2286 − 3048m)
−045
*69W73 73W37 *68W68
No Change 80W60
−070 80W66 80W59
−090 80W65 80W59
−110 80W66 80W59
−135 80W65 80W59
* Conversion requires installation of a gas valve manifold spring which is provided with the gas conversion kit.
Pressure switch is factory set. No adjustment necessary. All models use the factory−installed pressure switch from 0−4500 feet (0−1370 m).
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