Bryant Gas 340MAV - Manual (Page 41)

TABLE 10—MODEL 340MAV ORIFICE SIZE AND MANIFOLD PRESSURE FOR CORRECT INPUT
FOR USE WITH 140 SIZE FURNACES ONLY
(TABULATED DATA BASED ON 23,000 BTUH PER BURNER, DERATED 2% FOR EACH 1000 FT ABOVE SEA LEVEL)
ALTITUDE
RANGE
(FT)
AVG GAS
HEAT VALUE
AT ALTITUDE
(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
850 41 3.6 41 3.7 41 3.8 40 3.6 40 3.8
875 42 3.8 41 3.5 41 3.6 41 3.7 41 3.8
900 42 3.5 42 3.7 42 3.8 41 3.5 41 3.6
0 925 42 3.4 42 3.5 42 3.6 42 3.7 42 3.8
950 42 3.2 42 3.3 42 3.4 42 3.5 42 3.6
to 975 43 3.7 43 3.8 42 3.2 42 3.3 42 3.4
1000 43 3.5 43 3.6 43 3.7 42 3.2 42 3.3
2000 1025 43 3.3 43 3.4 43 3.6 43 3.7 43 3.8
1050 43 3.2 43 3.3 43 3.4 43 3.5 43 3.6
0% 1075 44 3.5 44 3.6 43 3.2 43 3.3 43 3.4
derate 1100 44 3.3 44 3.4 44 3.5 43 3.2 43 3.3
ALTITUDE
RANGE
(FT)
AVG GAS
HEAT VALUE
AT ALTITUDE
(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. 775 41 3.7 41 3.8 40 3.6 40 3.7 39 3.6
Altitudes 800 42 3.8 41 3.6 41 3.7 41 3.8 40 3.6
2001to 825 42 3.6 42 3.7 41 3.5 41 3.6 41 3.7
3000 850 42 3.4 42 3.5 42 3.6 42 3.7 41 3.5
or 875 42 3.2 42 3.3 42 3.4 42 3.5 42 3.6
Canada 900 43 3.7 43 3.8 42 3.2 42 3.3 42 3.4
Altitude 925 43 3.5 43 3.6 43 3.7 42 3.2 42 3.3
2001 to 950 43 3.3 43 3.4 43 3.5 43 3.7 43 3.8
4500 975 43 3.1 43 3.3 43 3.4 43 3.5 43 3.6
5% 1000 43 3.0 43 3.1 43 3.2 43 3.3 43 3.4
derate 1025 43 2.8 43 2.9 43 3.0 43 3.1 43 3.2
ALTITUDE
RANGE
(FT)
AVG GAS
HEAT VALUE
AT ALTITUDE
(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
750 41 3.6 41 3.8 40 3.6 40 3.7 40 3.8
775 42 3.8 41 3.5 41 3.6 41 3.7 40 3.6
800 42 3.5 42 3.7 42 3.8 41 3.5 41 3.6
3001 825 42 3.3 42 3.4 42 3.6 42 3.7 42 3.8
850 43 3.8 42 3.2 42 3.4 42 3.5 42 3.6
to 875 43 3.6 43 3.7 42 3.2 42 3.3 42 3.4
900 43 3.4 43 3.5 43 3.6 43 3.8 42 3.2
4000 925 43 3.2 43 3.3 43 3.5 43 3.6 43 3.7
950 43 3.1 43 3.2 43 3.3 43 3.4 43 3.5
7% 975 43 2.9 43 3.0 43 3.1 43 3.2 43 3.3
derate 1000 43 2.8 43 2.9 43 3.0 43 3.0 43 3.1
*Orifice numbers shown in BOLD are factory installed.
Percents of derate are based on midpoints of U.S. altitude ranges.
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