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18
Gas Adjustment
Natural Gas Orifice Sizes and Manifold Pressure - Single and Three Phase Models
Nameplate Input (Btu/hr)
Altitude of Installation (FT. Above Sea Level)
U.S.A.
*
*. In the U.S.A., the input rating for altitudes above 2000 ft (610m) must be reduced by 4% for each 1000 ft (305 m) above sea level.
In Canada, the input rating for altitudes from 2001 to 4500 ft (611 to 1372 m) above sea level must be derated by 10% by an authorized gas conversion station or dealer.
For Canadian Installations from 2000 to 4500 ft (610-1372 m), use U.S.A. column 2001 to 3000 ft (611 to 914 m).
0 to 2000
(0-610 m)
45,000
Orifice No. (Qty)
0.125-in.
Manifold Press. (in. W.C.)
3.2~3.8
60,000
Orifice No. (Qty)
28 (1)
Manifold Press. (in. W.C.)
3.2~3.8
89,000
Orifice No. (Qty)
18 (1)
Manifold Press. (in. W.C.)
3.2~3.8
High Altitude Compensation, Natural Gas - Single and Three Phase Models
Nameplate Input (Btu/hr)
Rated Heating Input (Btu/hr), Natural Gas at Installation Altitude Above Sea Level, U.S.A.
*
*
*. In the U.S.A., the input rating for altitudes above 2000 ft (610m) must be reduced by 4% for each 1000 ft (305 m) above sea level.
In Canada, the input rating for altitudes from 2001 to 4500 ft (611 to 1372 m) above sea level must be derated by 10% by an authorized gas conversion station or dealer.
For Canadian Installations from 2000 to 4500 ft (610-1372 m), use U.S.A. column 2001 to 3000 ft (611 to 914 m).
0 to 2000 ft
(0-610 m)
45,000
45,000
60,000
60,000
89,000
89,000
