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Proper Cumbustion
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 table below.
TABLE 20
CO
% For Nat
EL297
2
Model
Low Fire
045
5.4 - 6.4
070
5.3 - 6.3
090
5.8 - 6.8
110
6.1 - 7.1
135
6.1 - 7.1
The maximum carbon monoxide reading should not exceed 100ppm.
0 - 4500 ft
Unit
Gas
Low
Fire
Natuarl
1.7
All
LP/
Sizes
4.5
Propane
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.
LP/Propane Conversion Kit and Pressure Switch Requirements at Varying Altitudes
Unit
045
070
090
110
135
* 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).
CO
% For L.P
2
High Fire
Low Fire
High Fire
7.5 - 8.5
6.4 - 7.4
8.8 - 9.8
7.4 - 8.4
6.3 - 7.3
8.7 - 9.7
7.6 - 8.6
6.8 - 7.8
8.9 - 9.9
8.0 - 9.0
7.1 - 8.1
9.3 - 10.3
7.8 - 8.8
7.1 - 8.2
9.1 - 10.1
Manifold and Supply Line Pressure 0-10,000ft.
4501 - 5500 ft.
High
Low
High
Fire
Fire
Fire
3.5
1.6
3.3
10.0
4.2
9.4
High Altitude
Natural to
Natural Burner
LP/Propane
Orifice Kit
0 - 7500 ft
7501 - 10,000 ft
*11K51
73W37
High Altitude
NOTE - In Canada, certification for installations at eleva-
tions over 4500 feet (1372 m) is the jurisdiction of local
authorities.
Units may be installed at altitudes up to 10,000 ft. above
sea level. See TABLE 21 for de-rate manifold values. Units
installed at altitude of 7501 - 10,000 feet require an orifice
change. Units installed at altitude of 4501 - 10,000 feet
require a pressure switch change which can be ordered
separately. TABLE 22 lists conversion kit and pressure
switch requirements at varying altitudes.
The combustion air pressure switch is factory-set and re-
quiresno adjustment.
TABLE 21
Manifold Pressure in. wg.
5501 - 6500 ft
6501 - 7500 ft
Low
High
Low
Fire
Fire
Fire
1.5
3.2
1.5
4.0
9.1
3.9
TABLE 22
High Altitude LP/
Propane Burner
Orifice Kit
7501 - 10,000 ft
*11K46
Page 63
Pressure in. w.g
7501 - 10,000 ft
High
Low
High
Fire
Fire
Fire
3.1
1.7
3.5
8.9
4.5
10.0
High Altitude Pressure Switch
4501 - 7500 ft
7501 - 10,000 ft
14A51
14A48
14A54
25B93
25B94
Supply Line
0 - 10,000 ft.
Min
Max
4.5
13.0
11.0
13.0
14A53
14A54
14A53
14A45
25B95
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