Bryant 120/C Series - Page 46

46
Table 11 – Orifice Size and Manifold Pressure for Gas Input Rate
(Tabulated Data Based on 22,000 Btuh High--Heat/14,500 Btuh for Low -- Heat per Burner, Derated 4 Percent for Each 1000 Ft...
Above Sea Level)
ALTITUDE RANGE
(FT..)
AVG.. GAS
HEAT VALUE
(BTUH/CU
FT..)
SPECIFIC GRAVITY OF NATURAL GAS
0.58 0.60 0.62 0.64
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
U.S.A
.and
Cana-
da
0to
2000
900 42 3.5/1.5 42 3.6/1.6 42 3.7/1.6 41 3.5/1.5
925 42 3.3/1.4 42 3.4/1.5 42 3.5/1.5 42 3.7/1.6
950 43 3.8/1.7 42 3.3/1.4 42 3.4/1.5 42 3.5/1.5
975 43 3.6/1.6 43 3.8/1.6 42 3.2/1.4 42 3.3/1.4
1000 43 3.5/1.5 43 3.6/1.6 43 3.7/1.6 43 3.8/1.7
1025 43 3.3/1.4 43 3.4/1.5 43 3.5/1.5 43 3.6/1.6
1050 44 3.6/1.6 43 3.2/1.4 43 3.4/1.5 43 3.5/1.5
1075 44 3.4/1.5 44 3.5/1.5 43 3.2/1.4 43 3.3/1.4
1100 44 3.3/1.4 44 3.4/1.5 44 3.5/1.5 43 3.2/1.4
ALTITUDE RANGE
(FT..)
AVG.. GAS
HEAT VALUE
(BTUH/CU FT..)
SPECIFIC GRAVITY OF NATURAL GAS
0.58 0.60 0.62 0.64
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
U.S.A
.and
Cana-
da
U.S.A.
Altitudes
2001 to
3000 or
Canada
Altitudes
2001 to
4500
800 42 3.4/1.5 42 3.5/1.5 42 3.6/1.6 42 3.7/1.6
825 42 3.2/1.4 42 3.3/1.4 42 3.4/1.5 42 3.5/1.5
850 43 3.7/1.6 43 3.8/1.6 42 3.2/1.4 42 3.3/1.4
875 43 3.5/1.5 43 3.6/1.6 43 3.7/1.6 43 3.8/1.7
900 43 3.3/1.4 43 3.4/1.5 43 3.5/1.5 43 3.6/1.6
925 44 3.5/1.5 43 3.2/1.4 43 3.3/1.4 43 3.4/1.5
950 44 3.4/1.5 44 3.5/1.5 44 3.6/1.6 43 3.2/1.4
975 44 3.2/1.4 44 3.3/1.4 44 3.4/1.5 44 3.5/1.5
1000 45 3.7/1.6 45 3.8/1.7 44 3.2/1.4 44 3.4/1.5
ALTITUDE RANGE
(FT..)
AVG. GAS
HEAT VALUE
(BTUH/CU FT.)
SPECIFIC GRAVITY OF NATURAL GAS
0.58 0.60 0.62 0.64
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
U.S.A
.Only
3001 to
4000
775 42 3.2/1.4 42 3.3/1.4 42 3.4/1.5 42 3.5/1.5
800 43 3.6/1.6 43 3.8/1.6 42 3.2/1.4 42 3.3/1.4
825 43 3.4/1.5 43 3.5/1.5 43 3.7/1.6 43 3.8/1.6
850 43 3.2/1.4 43 3.3/1.4 43 3.4/1.5 43 3.6/1.5
875 44 3.5/1.5 44 3.6/1.6 43 3.3/1.4 43 3.4/1.5
900 44 3.3/1.4 44 3.4/1.5 44 3.5/1.5 43 3.2/1.4
925 45 3.8/1.6 44 3.2/1.4 44 3.3/1.5 44 3.4/1.5
950 46 3.8/1.6 45 3.7/1.6 45 3.8/1.7 44 3.3/1.4
ALTITUDE RANGE
(FT.)
SPECIFIC GRAVITY OF NATURAL GAS
AVG. GAS
HEAT VALUE
(BTUH/CU FT.)
0.58 0.60 0.62 0.64
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
U.S.A
.Only
4001 to
5000
750 43 3.6/1.6 43 3.8/1.6 42 3.2/1.4 42 3.3/1.4
775 43 3.4/1.5 43 3.5/1.5 43 3.6/1.6 43 3.8/1.6
800 43 3.2/1.4 43 3.3/1.4 43 3.4/1.5 43 3.5/1.5
825 44 3.4/1.5 44 3.6/1.5 43 3.2/1.4 43 3.3/1.4
850 44 3.2/1.4 44 3.4/1.5 44 3.5/1.5 44 3.6/1.6
875 45 3.7/1.6 45 3.8/1.7 44 3.3/1.4 44 3.4/1.5
900 46 3.7/1.6 46 3.8/1.7 45 3.7/1.6 44 3.2/1.4
925 46 3.5/1.5 46 3.6/1.6 46 3.7/1.6 46 3.8/1.7
* Orifice numbers 43 are factory installed
315A