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Table 19 – Orifice Size and Manifold Pressure (in. w.c.) for Gas Input Rate
26,000 BTUH ONLY
AVG. GAS
HEAT VALUE
AT ALTITUDE
Orifice Manifold Orifice Manifold Orifice Manifold Orifice Manifold
(Btu/cu ft)
No. Pressure No. Pressure No. Pressure No. Pressure
900 44 1.8
43 1.7 43 1.7 43 1.8
0 925 44 1.7 44 1.8
43 1.6 43 1.7
(0) 950 44 1.6 44 1.7 44 1.8 44 1.8
975 44 1.6 44 1.6 44 1.7 44 1.7
to 1000 44 1.5 44 1.5 44 1.6 44 1.6
1025 44 1.4 44 1.5 44 1.5 44 1.6
2000 1050 44 1.3 44 1.4 44 1.4 44 1.5
(610) 1075 44 1.3 44 1.3 44 1.4 44 1.4
1100 44 1.2 44 1.3 44 1.3 44 1.4
U.S.A. 800
43 1.7 43 1.8 43 1.8 42 1.6
2001 (611) 825
43 1.6 43 1.7 43 1.7 43 1.8
to 850 44 1.8 44 1.8
43 1.6 43 1.7
3000 (914) 875 44 1.7 44 1.7 44 1.8 44 1.8
900 44 1.6 44 1.6 44 1.7 44 1.7
Canada 925 44 1.5 44 1.5 44 1.6 44 1.6
2001 (611) 950 44 1.4 44 1.5 44 1.5 44 1.6
to 975 44 1.3 44 1.4 44 1.4 44 1.5
4500 (1372) 1000 44 1.3 44 1.3 44 1.4 44 1.4
775
43 1.7 43 1.8 43 1.8 42 1.5
800 44 1.8
43 1.7 43 1.7 43 1.8
3001 825 44 1.7 44 1.8 44 1.8
43 1.7
(915) 850 44 1.6 44 1.7 44 1.7 44 1.8
875 44 1.5 44 1.6 44 1.6 44 1.7
900 44 1.4 44 1.5 44 1.5 44 1.6
4000 925 44 1.4 44 1.4 44 1.5 44 1.5
(1219) 950 44 1.3 44 1.3 44 1.4 44 1.4
750
43 1.7 43 1.7 43 1.8 43 1.8
775 44 1.8
43 1.6 43 1.7 43 1.7
4001 800 44 1.7 44 1.7 44 1.8
43 1.6
(1220) 825 44 1.6 44 1.6 44 1.7 44 1.8
850 44 1.5 44 1.5 44 1.6 44 1.7
to 875 44 1.4 44 1.5 44 1.5 44 1.6
5000 900 44 1.3 44 1.4 44 1.4 44 1.5
(1524) 925 44 1.3 44 1.3 44 1.4 44 1.4
725
43 1.7 43 1.7 43 1.8 43 1.8
5001 750 44 1.8 44 1.8
43 1.7 43 1.7
(1525) 775 44 1.7 44 1.7 44 1.8 44 1.8
800 44 1.6 44 1.6 44 1.7 44 1.7
825 44 1.5 44 1.5 44 1.6 44 1.6
850 44 1.4 44 1.4 44 1.5 44 1.5
6000 875 44 1.3 44 1.3 44 1.4 44 1.4
(1829) 900 44 1.2 44 1.3 44 1.3 44 1.4
675
43 1.8 43 1.8 42 1.5 42 1.6
6001 700
43 1.6 43 1.7 43 1.7 43 1.8
(1830) 725 44 1.7 44 1.8
43 1.6 43 1.7
750 44 1.6 44 1.7 44 1.7 44 1.8
775 44 1.5 44 1.6 44 1.6 44 1.7
7000 800 44 1.4 44 1.5 44 1.5 44 1.6
(2133) 825 44 1.3 44 1.4 44 1.4 44 1.5
850 44 1.3 44 1.3 44 1.4 44 1.4
* Orifice numbers shown in BOLD are factory-installed.
U.S.A. OnlyU.S.A. Only
to
U.S.A. Only
to
ORIFICE SIZE* AND MANIFOLD PRESSURE (IN WC) FOR GAS INPUT RATE
TABULATED DATA BASED ON 13,000 BTUH PER BURNER, DERATED 2%/1000 FT (305M) ABOVE SEA LEVE
ALTITUDE
RANGE
U.S.A. and CanadaU.S.A. and CanadaU.S.A. Only
ft (m)
SPECIFIC GRAVITY OF NATURAL GAS
0.58 0.60 0.62 0.64
to
A150571