Bryant 310A Installation, Start--Up, Operating, And Service And Maintenance page 43

(Tabulated data based on 21,000 btuh per burner, derated 4 percent for each 1000 ft. (305 M) above sea level)
ALTITUDE
RANGE
HEAT VALUE
FT. (M)
AT ALTITUDE
(BTU/CU FT.)
U.S.A. and 0 to 2000
Canada (0 to 610)
U.S.A.
Altitudes
2001 to
3000
(610 to
U.S.A. and 914)or
Canada Canada
Altitudes
2000 to
4500
(610 to
1372)
3001 to
4000
U.S.A. Only
(914 to
1219)
4001 to
5000
U.S.A. Only
(1219 to
1524)
* Orifice numbers 43 are factory installed.
Table 14—Orifice Size* and Manifold Pressure for Gas Input Rate
AVG. GAS
0.58
Orifice Manifold
No. Pressure
900 42 3.2
925 43 3.7
950 43 3.5
975 43 3.3
1000 44 3.6
1025 44 3.4
1050 44 3.3
1075 45 3.8
1100 46 3.8
800 43 3.8
825 43 3.5
850 43 3.3
875 43 3.2
900 43 3.0
925 43 2.8
950 43 2.7
975 43 2.5
1000 43 2.4
775 43 3.5
800 43 3.3
825 43 3.1
850 43 2.9
875 43 2.8
900 43 2.6
925 43 2.5
950 43 2.4
750 43 3.3
775 43 3.1
800 43 2.9
825 43 2.7
850 43 2.6
875 43 2.4
900 43 2.3
925 43 2.2
SPECIFIC GRAVITY OF NATURAL GAS
0.60 0.62
Orifice Manifold Orifice
No. Pressure No.
42 3.3 42
43 3.8 42
43 3.6 43
43 3.4 43
43 3.3 43
44 3.6 43
44 3.4 44
44 3.2 44
45 3.7 44
42 3.2 42
43 3.7 43
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
43 3.7 43
43 3.4 43
43 3.2 43
43 3.0 43
43 2.9 43
43 2.7 43
43 2.6 43
43 2.4 43
43 3.4 43
43 3.2 43
43 3.0 43
43 2.8 43
43 2.7 43
43 2.5 43
43 2.4 43
43 2.2 43
43
0.64
Manifold Orifice Manifold
Pressure No. Pressure
3.4 42 3.5
3.2 42 3.3
3.7 43 3.8
3.5 43 3.7
3.4 43 3.5
3.2 43 3.3
3.5 43 3.2
3.3 44 3.4
3.2 44 3.3
3.3 42 3.4
3.8 42 3.2
3.6 43 3.7
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 2.7
3.8 42 3.2
3.5 43 3.7
3.3 43 3.4
3.1 43 3.2
3.0 43 3.1
2.8 43 2.9
2.7 43 2.7
2.5 43 2.6
3.5 43 3.6
3.3 43 3.4
3.1 43 3.2
2.9 43 3.0
2.8 43 2.8
2.6 43 2.7
2.5 43 2.5
2.3 43 2.4