Installation guide

Table 15--Orifice Size* and Manifold Pressure (In. W.C.) for Gas Input Rate (Continued)
(Tabulated data based on 21,000 btuh per burner, derated 4 percent for each 1000 ft. (305 M) above sea level)
AVG. GAS SPECIFIC GRAVITY OF NATURAL GAS
ALTITUDE HEAT VALUE
0.58 0.60 0.62 0.64
RANGE AT
FT. (M) ALTITUDE Orifice Manifold Orifice Manifold Orifice Manifold Orifice Manifold
(BTU/CU FT.) No. Pressure No. Pressure No. Pressure No. Pressure
725 43 3.1 43 3.2 43 3.3 43 3.4
750 43 2.9 43 3.0 43 3.1 43 3.2
775 43 2.7 43 2.8 43 2.9 43 3.0
5001 to
6000 800 43 2.5 43 2.6 43 2.7 43 2.8
U.S.A. (1524 to 825 43 2.4 43 2.5 43 2.5 43 2.6
1829) 850 43 2.2 43 2.3 43 2.4 43 2.5
875 43 2.1 43 2.2 43 2.3 43 2.3
900 43 2.0 43 2.1 43 2.1 43 2.2
675 43 3.1 43 3.2 43 3.3 43 3.4
700 43 2.9 43 3.0 43 3.1 43 3.2
725 43 2.7 43 2.8 43 2.9 43 2.9
6001 to
7000 750 43 2.5 43 2.6 43 2.7 43 2.8
U.S.A. (1829 to 775 43 2.3 43 2.4 43 2.5 43 2.6
2134) 800 43 2.2 43 2.3 43 2.3 43 2.4
825 43 2.1 43 2.1 43 2.2 43 2.3
850 48 3.7 43 2.0 43 2.1 43 2.1
650 43 2.9 43 3.0 43 3.1 43 3.2
675 43 2.7 43 2.7 43 2.8 43 2.9
700 43 2.5 43 2.6 43 2.6 43 2.7
7001 to
8000 725 43 2.3 43 2.4 43 2.5 43 2.5
U.S.A. (2134 to 750 43 2.1 43 2.2 43 2.3 43 2.4
2438) 775 43 2.0 43 2.1 43 2.2 43 2.2
800 48 3.6 48 3.7 43 2.0 43 2.1
825 48 3.3 48 3.5 48 3.6 48 3.7
625 43 2.7 43 2.7 43 2.8 43 2.9
650 43 2.5 43 2.5 43 2.6 43 2.7
8001 to
9000 675 43 2.3 43 2.4 43 2.4 43 2.5
U.S.A.
(2438 to 700 43 2.1 43 2.2 43 2.3 43 2.3
2743) 725 48 3.7 43 2.0 43 2.1 43 2.2
750 48 3.5 48 3.6 48 3.7 43 2.0
600 43 2.4 43 2.5 43 2.6 43 2.7
U.S.A,
625 43 2.3 43 2.3 43 2.4 43 2.5
9001 to
10,000 650 43 2.1 43 2.2 43 2.2 43 2.3
(2743 to 675 48 3.6 48 3.8 43 2.1 43 2.1
3048) 700 48 3.4 48 3.5 48 3.6 48 3.7
725 49 3.7 49 3.8 48 3.4 48 3.5
775 49 3.8 48 3.4 48 3.5 48 3.6
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