Bryant 310A Installation, Start--Up, Operating, And Service And Maintenance page 41

(Tabulated data based on 22,000 btuh per burner, derated 4 percent for each 1000 ft. (305 M) above sea level)
AVG. GAS
ALTITUDE RANGE HEAT VALUE
AT ALTITUDE
FT. (M)
(BTU/CU FT.)
0 to
U.S.A.
2000
and
(0 to
Canada
610)
U.S.A.
Altitudes
2001 to
3000
(610 to
U.S.A. 914) or
and Canada
Canada Altitudes
2000 to
4500
(610 to
1372)
3001 to
U.S.A.
4000
Only
(914 to
1219)
4001 to
U.S.A.
5000
Only
(1219 to
1524)
* Orifice numbers 43 are factory installed.
Table 13—Orifice Size* and Manifold Pressure for Gas Input Rate
0.58
Orifice Manifold
No. Pressure
900 42 3.5
925 42 3.3
950 43 3.8
975 43 3.6
1000 43 3.5
1025 43 3.3
1050 44 3.6
1075 44 3.4
1100 44 3.3
800 42 3.4
825 42 3.2
850 43 3.7
875 43 3.5
900 43 3.3
925 43 3.1
950 43 2.9
975 43 2.8
1000 43 2.6
775 42 3.2
800 43 3.6
825 43 3.4
850 43 3.2
875 43 3.0
900 43 2.9
925 43 2.7
950 43 2.6
750 43 3.6
775 43 3.4
800 43 3.2
825 43 3.0
850 43 2.8
875 43 2.7
900 43 2.5
925 43 2.4
SPECIFIC GRAVITY OF NATURAL GAS
0.60
Orifice Manifold Orifice
No. Pressure No.
42 3.6 42
42 3.4 42
42 3.3 42
43 3.8 42
43 3.6 43
43 3.4 43
43 3.2 43
44 3.5 43
44 3.4 44
42 3.5 42
42 3.3 42
43 3.8 42
43 3.6 43
43 3.4 43
43 3.2 43
43 3.0 43
43 2.9 43
43 2.7 43
42 3.3 42
43 3.8 42
43 3.5 43
43 3.3 43
43 3.1 43
43 3.0 43
43 2.8 43
43 2.7 43
43 3.8 42
43 3.5 43
43 3.3 43
43 3.1 43
43 2.9 43
43 2.8 43
43 2.6 43
43 2.5 43
41
0.62 0.64
Manifold Orifice Manifold
Pressure No. Pressure
3.7 41 3.5
3.5 42 3.7
3.4 42 3.5
3.2 42 3.3
3.7 43 3.8
3.5 43 3.6
3.4 43 3.5
3.2 43 3.3
3.5 43 3.2
3.6 42 3.7
3.4 42 3.5
3.2 42 3.3
3.7 43 3.8
3.5 43 3.6
3.3 43 3.4
3.1 43 3.2
3.0 43 3.1
2.8 43 2.9
3.4 42 3.5
3.2 42 3.3
3.7 43 3.8
3.4 43 3.6
3.3 43 3.4
3.1 43 3.2
2.9 43 3.0
2.8 43 2.8
3.2 42 3.3
3.6 43 3.8
3.4 43 3.5
3.2 43 3.3
3.0 43 3.1
2.9 43 2.9
2.7 43 2.8
2.6 43 2.6