Carrier 140/E Series Installation, Start--Up, Operating, And Service And Maintenance page 43

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Table 14 - Orifice Size* And Manifold Pressure (In. W.C.) For Gas Input Rate
(Tabulated Data Based On 21,000 Btuh Per Burner, Derated 4 Percent For Each 1000 Ft. (305 M) Above Sea Level)
(TABULATED DATA BASED ON 21,000 BTUH PER BURNER, DERATED 4%/1000 FT (305M) ABOVE SEA LEVEL)
ALTITUDE AVG. GAS SPECIFIC GRAVITY OF NATURAL GAS
RANGE HEAT VALUE 0.58 0.60 0.62
AT ALTITUDE Orifice Manifold Orifice Manifold Orifice Manifold Orifice
ft (m) IBtu/cu ft I No. Pressure No. Pressure No. Pressure No.
900 42 3.2 42 3.3 42 3.4 42
0 925 43 3.7 43 3.8 42 3.2 42
(0) 950 43 3.5 43 3.6 43 3.7 43
975 43 3.3 43 3.4 43 3.5 43
to 1000 44 3.6 43 3.3 43 3.4 43
1025 44 3.4 44 3.6 43 3.2 43
2000 1050 44 3.3 44 3.4 44 3.5 43
(610) 1075 45 3.8 44 3.2 44 3.3 44
1100 46 3.8 45 3.7 44 3.2 44
800 43 3.8 42 3.2 42 3.3 42
825 43 3.5 43 3.7 43 3.8 42
U.S.A. 850 43 3.3 43 3.5 43 3.6 43
2001 (611) 875 43 3.2 43 3.3 43 3.4 43
to 900 43 3.0 43 3.1 43 3.2 43
3000 (914) 925 43 2.8 43 2.9 43 3.0 43
950 43 2.7 43 2.8 43 2.9 43
975 43 2.5 43 2.6 43 2.7 43
1000 43 2.4 43 2.5 43 2.6 43
775 43 3.5 43 3.7 43 3.8 42
3001 800 43 3.3 43 3.4 43 3.5 43
(915) 825 43 3.1 43 3.2 43 3.3 43
850 43 2.9 43 3.0 43 3.1 43
to
875 43 2.8 43 2.9 43 3.0 43
4000 900 43 2.6 43 2.7 43 2.8 43
(1219) 925 43 2.5 43 2.6 43 2.7 43
950 43 2.4 43 2.4 43 2.5 43
750 43 3.3 43 3.4 43 3.5 43
4001 775 43 3.1 43 3.2 43 3.3 43
(1220) 800 43 2.9 43 3.0 43 3.1 43
825 43 2.7 43 2.8 43 2.9 43
to
850 43 2.6 43 2.7 43 2.8 43
5000 875 43 2.4 43 2.5 43 2.6 43
(1524) 900 43 2.3 43 2.4 43 2.5 43
925 43 2.2 43 2.2 43 2.3 43
725 43 3.1 43 3.2 43 3.3 43
5001 750 43 2.9 43 3.0 43 3.1 43
(1525) 775 43 2.7 43 2.8 43 2.9 43
800 43 2.5 43 2.6 43 2.7 43
to
825 43 2.4 43 2.5 43 2.5 43
6000 850 43 2.2 43 2.3 43 2.4 43
(1829) 875 43 2.1 43 2.2 43 2.3 43
900 43 2.0 43 2.1 43 2.1 43
675 43 3.1 43 3.2 43 3.3 43
6001 700 43 2.9 43 3.0 43 3.1 43
(1830) 725 43 2.7 43 2.8 43 2.9 43
750 43 2.5 43 2.6 43 2.7 43
to
775 43 2.3 43 2.4 43 2.5 43
7000 800 43 2.2 43 2.3 43 2.3 43
(2133) 825 43 2.1 43 2.1 43 2.2 43
850 48 3.7 43 2.0 43 2.1 43
0.64
Manifold
Pressure
3.5
3.3
3.8
3.7
3.5
3.3
3.2
3.4
3.3
3.4
3.2
3.7
3.5
3.3
3.1
2.9
2.8
2.7
3.2
3.7
3.4
3.2
3.1
2.9
2.7
2.6
3.6
3.4
3.2
3.0
2.8
2.7
2.5
2.4
3.4
3.2
3.0
2.8
2.6
2.5
2.3
2.2
3.4
3.2
2.9
2.8
2.6
2.4
2.3
2.1
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