Installation guide

Table 14--Orifice Size* and Manifold Pressure (In. W.C.) for Gas Input Rate
(Tabulated data based on 22,000 btuh per burner, derated 4 percent for each 1000 ft. (305 M) above sea level)
AVG. GAS SPECIFIC GRAVITY OF NATURAL GAS
ALTITUDE RANGE HEAT VALUE 0.58 0.60 0.62 0.64
FT. (M) AT ALTITUDE Orifice Manifold Orifice Manifold Orifice Manifold Orifice Manifold
(BTU/CU FT.) No. Pressure No. Pressure No. Pressure No. Pressure
900 42 3.5 42 3.6 42 3.7 41 3.5
925 42 3.3 42 3.4 42 3.5 42 3.7
950 43 3.8 42 3.3 42 3.4 42 3.5
0 to 975 43 3.6 43 3.8 42 3.2 42 3.3
2000
U.S.A, 1000 43 3.5 43 3.6 43 3.7 43 3.8
(0 to
610) 1025 43 3.3 43 3.4 43 3.5 43 3.6
1050 44 3.6 43 3.2 43 3.4 43 3.5
1075 44 3.4 44 3.5 43 3.2 43 3.3
1100 44 3.3 44 3.4 44 3.5 43 3.2
800 42 3.4 42 3.5 42 3.6 42 3.7
825 42 3.2 42 3.3 42 3.4 42 3.5
2001 to 850 43 3.7 43 3.8 42 3.2 42 3.3
3000 875 43 3.5 43 3.6 43 3.7 43 3.8
U.S.A, (610 to 900 43 3.3 43 3.4 43 3.5 43 3.6
914) 925 43 3.1 43 3.2 43 3.3 43 3.4
950 43 2.9 43 3.0 43 3.1 43 3.2
975 43 2.8 43 2.9 43 3.0 43 3.1
1000 43 2.6 43 2.7 43 2.8 43 2.9
775 42 3.2 42 3.3 42 3.4 42 3.5
800 43 3.6 43 3.8 42 3.2 42 3.3
3001 to 825 43 3.4 43 3.5 43 3.7 43 3.8
U.S.A, 4000 850 43 3.2 43 3.3 43 3.4 43 3.6
(914 to 875 43 3.0 43 3.1 43 3.3 43 3.4
1219) 900 43 2.9 43 3.0 43 3.1 43 3.2
925 43 2.7 43 2.8 43 2.9 43 3.0
950 43 2.6 43 2.7 43 2.8 43 2.8
750 43 3.6 43 3.8 42 3.2 42 3.3
775 43 3.4 43 3.5 43 3.6 43 3.8
4001 to 800 43 3.2 43 3.3 43 3.4 43 3.5
U.S.A, 5000 825 43 3.0 43 3.1 43 3.2 43 3.3
(1219 to 850 43 2.8 43 2.9 43 3.0 43 3.1
1524) 875 43 2.7 43 2.8 43 2.9 43 2.9
900 43 2.5 43 2.6 43 2.7 43 2.8
925 43 2.4 43 2.5 43 2.6 43 2.6
Orifice numbers 43 are factory installed.
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