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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 8.
Capacity
CO
All
The maximum carbon monoxide reading should not exceed
100 ppm.
Table 8.
Capacity
Gas
Natural
045
LP / Propane
Natural
070
LP / Propane
Natural
090
LP / Propane
Natural
110
LP / Propane
Natural
135
LP / Propane
NOTE: A natural to LP propane gas changeover kit is necessary to convert this unit. Refer to the changeover kit installation
instruction for the conversion procedure.
Capacity
Pressure
As Shipped
045
(-0.65" w.c.)
As Shipped
070
(-0.68" w.c.)
As Shipped
090
(-0.65" w.c.)
As Shipped
110
(-0.68" w.c.)
As Shipped
135
(-0.65" w.c.)
1 Minimum allowable set points for this altitude range. Application of a Pressure Switch with lower set point (less negative / closer to zero) is not
permitted.
2 Kit contains burner orifices and gas valve regulator spring(s).
% for Nat
CO
% for L.P.
2
2
7.2 - 7.8
7.5 - 9.0
Manifold Pressure in. w.g.
0-2,000 ft.
2,001-4,500 ft.
3.5
3.2
10.5
10.0
3.5
3.2
10.0
10.0
3.5
3.2
10.0
10.0
3.5
3.5
10.0
10.0
3.5
3.5
10.0
10.0
Table 9. Manifold and Supply Line Pressure 0-10,000 ft.
0-4,600 ft
Natural to LP/
Switch Kit
1
Propane Orifice Kit
11K50
2
(0.034")
Table 10. Burner Orifice Conversion Kits at Varying Altitudes
High Altitude
The manifold pressure may require adjustment and
combustion air pressure switch may need replacing to
ensure proper combustion at higher altitudes. Refer to
Table 9 for manifold pressure and Table 10 for pressure
switch change and gas conversion kits.
For safety, shut unit off and remove manometer as soon
as an accurate reading has been obtained. Take care to
replace pressure tap plug.
4,501-7,500 ft.
7,501-10,000 ft.
3.0
10.0
2.8
10.0
2.7
9.6
3.0
9.6
2.9
9.6
4,601 - 7,600 ft
Natural to LP/
Pressure
Switch
1
Propane Orifice
Kit
80W52
(-0.60" w.c.)
11K50
(0.034")
80W57
(-0.65" w.c.)
80W52
(-0.60" w.c.)
Page 20
IMPORTANT
Supply Line Pressure
in. w.g.
Min.
3.5
4.5
10.0
11.0
3.5
4.5
10.0
11.0
3.5
4.5
10.0
11.0
3.5
4.5
10.0
11.0
3.5
4.5
10.0
11.0
7,601 - 10,000 ft
Pressure
Switch
1
Kit
Kit
80W51
(-0.55" w.c.)
2
80W52
(-0.60" w.c.)
80W51
(-0.55" w.c.)
Max
13.0
LP/Propane to
Natural Orifice
Kit
11K45²
(0.032")
31-5000735 Rev. 0
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Troubleshooting
