Bryant 312AAV - Manual (Page 21)

TABLE 9–MODEL 312AAV GAS ORIFICE SIZE* AND MANIFOLD PRESSURES FOR GAS INPUT
(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
(BTU/CU FT)
SPECIFIC GRAVITY OF NATURAL GAS
0.58 0.60 0.62 0.64 0.66
Orifice
no.
Manifold
Pressure
Orifice
no.
Manifold
Pressure
Orifice
no.
Manifold
Pressure
Orifice
no.
Manifold
Pressure
Orifice
no.
Manifold
Pressure
U.S.A.
and
Canada 0
to
2000
850 42 3.6/1.6 42 3.8/1.6 41 3.5/1.5 41 3.6/1.6 41 3.7/1.6
875 42 3.4/1.5 42 3.6/1.5 42 3.7/1.6 42 3.8/1.6 41 3.5/1.5
900 42 3.2/1.4 42 3.4/1.5 42 3.5/1.5 42 3.6/1.6 42 3.7/1.6
925 43 3.7/1.6 42 3.2/1.4 42 3.3/1.4 42 3.4/1.5 42 3.5/1.5
950 43 3.6/1.5 43 3.7/1.6 43 3.8/1.6 42 3.2/1.4 42 3.3/1.4
975 43 3.4/1.5 43 3.5/1.5 43 3.6/1.6 43 3.7/1.6 43 3.8/1.7
1000 43 3.2/1.4 43 3.3/1.4 43 3.4/1.5 43 3.5/1.5 43 3.6/1.6
1025 44 3.5/1.5 43 3.2/1.4 43 3.3/1.4 43 3.4/1.5 43 3.5/1.5
1050 44 3.3/1.4 44 3.4/1.5 44 3.6/1.5 43 3.2/1.4 43 3.3/1.4
1075 45 3.8/1.7 44 3.3/1.4 44 3.4/1.5 44 3.5/1.5 43 3.2/1.4
1100 45 3.7/1.6 45 3.8/1.7 44 3.2/1.4 44 3.4/1.5 44 3.5/1.5
ALTITUDE
RANGE
(FT)
AVG GAS
HEAT VALUE
(BTU/CU FT)
SPECIFIC GRAVITY OF NATURAL GAS
0.58 0.60 0.62 0.64 0.66
Orifice
no.
Manifold
Pressure
Orifice
no.
Manifold
Pressure
Orifice
no.
Manifold
Pressure
Orifice
no.
Manifold
Pressure
Orifice
no.
Manifold
Pressure
U.S.A.
and
Canada
U.S.A.
Altitudes
2001
to
3000
or
Canada
Altitudes
2000
to
4500
775 42 3.4/1.5 42 3.5/1.5 42 3.6/1.6 42 3.7/1.6 42 3.8/1.7
800 43 3.8/1.7 42 3.3/1.4 42 3.4/1.5 42 3.5/1.5 42 3.6/1.6
825 43 3.6/1.6 43 3.7/1.6 42 3.2/1.4 42 3.3/1.4 42 3.4/1.5
850 43 3.4/1.5 43 3.5/1.5 43 3.6/1.6 43 3.8/1.6 42 3.2/1.4
875 43 3.2/1.4 43 3.3/1.4 43 3.4/1.5 43 3.5/1.5 43 3.6/1.6
900 44 3.5/1.5 44 3.6/1.6 43 3.2/1.4 43 3.3/1.5 43 3.4/1.5
925 44 3.3/1.5 44 3.4/1.5 44 3.5/1.5 43 3.2/1.4 43 3.3/1.4
950 45 3.8/1.6 44 3.2/1.4 44 3.3/1.4 44 3.4/1.5 44 3.6/1.5
975 46 3.8/1.6 45 3.7/1.6 45 3.8/1.7 44 3.3/1.4 44 3.4/1.5
1000 46 3.8/1.6 46 3.7/1.6 46 3.8/1.7 45 3.8/1.6 44 3.2/1.4
1025 46 3.4/1.5 46 3.5/1.5 46 3.6/1.6 46 3.8/1.6 45 3.7/1.6
ALTITUDE
RANGE
(FT)
AVG GAS
HEAT VALUE
(BTU/CU FT)
SPECIFIC GRAVITY OF NATURAL GAS
0.58 0.60 0.62 0.64 0.66
Orifice
no.
Manifold
Pressure
Orifice
no.
Manifold
Pressure
Orifice
no.
Manifold
Pressure
Orifice
no.
Manifold
Pressure
Orifice
no.
Manifold
Pressure
U.S.A.
Only 3001
to
4000
750 43 3.8/1.7 42 3.3/1.4 42 3.4/1.5 42 3.5/1.5 42 3.6/1.6
775 43 3.6/1.6 43 3.7/1.6 43 3.8/1.7 42 3.3/1.4 42 3.4/1.5
800 43 3.4/1.5 43 3.5/1.5 43 3.6/1.6 43 3.7/1.6 43 3.8/1.7
825 43 3.2/1.4 43 3.3/1.4 43 3.4/1.5 43 3.5/1.5 43 3.6/1.6
850 44 3.4/1.5 44 3.5/1.5 43 3.2/1.4 43 3.3/1.4 43 3.4/1.5
875 44 3.2/1.4 44 3.3/1.5 44 3.5/1.5 44 3.6/1.6 43 3.2/1.4
900 45 3.7/1.6 45 3.8/1.7 44 3.3/1.4 44 3.4/1.5 44 3.5/1.5
925 46 3.7/1.6 46 3.8/1.7 45 3.7/1.6 44 3.2/1.4 44 3.5/1.4
950 46 3.5/1.5 46 3.6/1.6 46 3.7/1.6 45 3.7/1.6 45 3.8/1.6
975 47 3.8/1.6 46 3.4/1.5 46 3.5/1.5 46 3.7/1.6 46 3.8/1.6
1000 47 3.6/1.6 47 3.7/1.6 47 3.8/1.7 46 3.5/1.5 46 3.6/1.6
ALTITUDE
RANGE
(FT)
AVG GAS
HEAT VALUE
(BTU/CU FT)
SPECIFIC GRAVITY OF NATURAL GAS
0.58 0.60 0.62 0.64 0.66
Orifice
no.
Manifold
Pressure
Orifice
no.
Manifold
Pressure
Orifice
no.
Manifold
Pressure
Orifice
no.
Manifold
Pressure
Orifice
no.
Manifold
Pressure
U.S.A.
Only
4001
to
5000
725 43 3.6/1.6 43 3.7/1.6 42 3.2/1.4 42 3.3/1.4 42 3.4/1.5
750 43 3.4/1.5 43 3.5/1.5 43 3.6/1.5 43 3.7/1.6 43 3.8/1.7
775 43 3.2/1.4 43 3.3/1.4 43 3.4/1.5 43 3.5/1.5 43 3.6/1.6
800 44 3.4/1.5 44 3.5/1.5 43 3.2/1.4 43 3.3/1.4 43 3.4/1.5
825 44 3.2/1.4 44 3.3/1.4 44 3.4/1.5 44 3.5/1.5 43 3.2/1.4
850 46 3.8/1.7 45 3.8/1.6 44 3.2/1.4 44 3.3/1.4 44 3.4/1.5
875 46 3.6/1.6 46 3.7/1.6 45 3.7/1.6 45 3.8/1.6 44 3.2/1.4
900 46 3.4/1.5 46 3.5/1.5 46 3.6/1.6 46 3.8/1.6 45 3.7/1.6
925 47 3.7/1.6 47 3.8/1.6 46 3.4/1.5 46 3.6/1.5 46 3.7/1.6
950 47 3.5/1.5 47 3.6/1.6 47 3.7/1.6 47 3.8/1.7 46 3.5/1.5
* Orifice numbers (43) shown in shading are factory installed.
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