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Proper Combustion
Furnace should operate minimum 15 minutes with correct
manifold pressure and gas flow rate before checking
combustion. Take combustion sample beyond the flue
outlet and compare to Table 14. The maximum carbon
monoxide reading should not exceed 100 ppm.
CO
% for Nat
2
Model
Low Fire
High Fire
-070
5.5 - 6.5
7.3 - 8.3
-090
5.9 - 6.9
7.8 - 8.8
-110
6.3 - 7.3
8.2 - 9.2
The maximum carbon monoxide reading should not exceed
100ppm.
Table 16.
NF96DV
Gas
Natural
All Models
Lp/
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.
Natural to LP/
Model
070
090
110
*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-
1371 m).
Table 15. Conversion Kit Fan Pressure Switch Requirements at Varying Altitudes
31-5000727 Rev. 0
CO
% for LP
2
Low Fire
High Fire
6.5 - 7.5
8.6 - 9.6
6.9 - 7.9
9.1 - 10.1
7.3 - 8.3
9.5 - 10.5
0 - 4500 ft.
4501 - 5500 ft.
Low
High
Low
High
Fire
Fire
Fire
Fire
1.7
3.5
1.6
4.9
10.0
4.6
Table 14. Manifold and Supply Line Pressure 0 - 10,000 ft.
High Altitude Natural
Propane
Burner Orifice Kit
0 - 7500 ft
7501 - 10000 ft
(0 - 2286m)
(2286 - 3048m)
11K48
*51W01
High Altitude
The manifold pressure, gas orifice and pressure switch
may require adjustment or replacement to ensure proper
operation at higher altitudes. See Table 15 for manifold
pressures. See Table 16 for gas conversion and pressure
switch kits.
Manifold Pressure in w.g.
5501 - 6500ft.
6501 - 7500ft.
Low
High
Low
Fire
Fire
Fire
3.3
1.5
3.2
1.5
9.4
4.4
9.1
4.3
High Altitude LP/
Propane Burner
Orifice Kit
7501 - 10000 ft
(2286 - 3048m)
11K47
Page 43
7501-10000ft.
High
Low
High
Fire
Fire
Fire
3.1
1.7
3.5
8.9
4.9
10.0
High Altitude Pressure switch
4501 - 7500 ft
7501 - 10000 ft
(1371 - 2286m)
(2286 - 3048m)
14A55
14A54
14A46
Supply Line
Pressure in
w.g.
0 - 10000 ft.
Min.
Max.
4.5
13.0
11.0
13.0
14A56
14A53
14A51
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