Bryant 345MAV Installation, Start-Up, And Operating Instructions Manual page 37

TABLE 9—MODEL 345MAV ORIFICE SIZE AND MANIFOLD PRESSURE FOR CORRECT INPUT
(TABULATED DATA BASED ON 20,000 BTUH PER BURNER, DERATED 2% FOR EACH 1000 FT ABOVE SEA LEVEL) *
AVG GAS
ALTITUDE
HEAT VALUE
RANGE
AT ALTITUDE
(FT)
(BTU/CU FT)
850
875
900
0 925
950
to 975
1000
2000 1025
1050
0% 1075
derate 1100
AVG GAS
ALTITUDE
HEAT VALUE
RANGE
AT ALTITUDE
(FT)
(BTU/CU FT)
U.S.A. 775
Altitudes 800
2001 to 825
3000 850
or 875
Canada 900
Altitudes 925
2001 to 950
4000 975
5% 1000
derate 1025
AVG GAS
ALTITUDE
HEAT VALUE
RANGE
AT ALTITUDE
(FT)
(BTU/CU FT)
750
775
800
3001 825
850
to 875
900
4000 925
950
7% 975
derate 1000
* Orifice numbers 45 are factory installed.
Percents of derate are based on midpoints of U.S. altitude ranges.
0.58 0.60
Orifice Manifold Orifice
No. Pressure No.
43 3.7 43
43 3.5 43
44 3.7 43
44 3.5 44
44 3.4 44
44 3.2 44
45 3.7 45
45 3.5 45
45 3.3 45
45 3.2 45
47 3.6 47
0.58 0.60
Orifice Manifold Orifice
No. Pressure No.
43 3.8 42
43 3.5 43
44 3.8 43
44 3.6 44
44 3.4 44
44 3.2 44
45 3.7 45
45 3.5 45
45 3.3 45
45 3.1 45
45 3.0 45
0.58 0.60
Orifice Manifold Orifice
No. Pressure No.
43 3.7 43
43 3.5 43
44 3.7 43
44 3.5 44
44 3.3 44
45 3.8 44
45 3.6 45
45 3.4 45
45 3.2 45
45 3.0 45
45 2.9 45
—37—
SPECIFIC GRAVITY OF NATURAL GAS
0.62
Manifold Orifice Manifold
Pressure No. Pressure
3.8 42 3.2
3.6 43 3.7
3.4 43 3.5
3.7 44 3.8
3.5 44 3.6
3.3 44 3.4
3.8 44 3.2
3.6 45 3.7
3.4 45 3.6
3.3 45 3.4
3.7 45 3.2
SPECIFIC GRAVITY OF NATURAL GAS
0.62
Manifold Orifice Manifold
Pressure No. Pressure
3.2 42 3.3
3.7 43 3.8
3.4 43 3.6
3.7 44 3.8
3.5 44 3.6
3.3 44 3.4
3.8 44 3.2
3.6 45 3.7
3.4 45 3.5
3.2 45 3.4
3.1 45 3.2
SPECIFIC GRAVITY OF NATURAL GAS
0.62
Manifold Orifice Manifold
Pressure No. Pressure
3.8 42 3.3
3.6 43 3.7
3.4 43 3.5
3.6 44 3.8
3.4 44 3.5
3.2 44 3.3
3.7 45 3.8
3.5 45 3.6
3.3 45 3.4
3.2 45 3.3
3.0 45 3.1
0.64 0.66
Orifice Manifold Orifice
No. Pressure No.
42 3.3 42
43 3.8 42
43 3.6 43
43 3.4 43
44 3.7 44
44 3.5 44
44 3.4 44
44 3.2 44
45 3.7 45
45 3.5 45
45 3.4 45
0.64 0.66
Orifice Manifold Orifice
No. Pressure No.
42 3.4 42
42 3.2 42
43 3.7 43
43 3.5 43
44 3.7 43
44 3.5 44
44 3.3 44
45 3.8 44
45 3.6 45
45 3.5 45
45 3.3 45
0.64 0.66
Orifice Manifold Orifice
No. Pressure No.
42 3.4 42
43 3.8 42
43 3.6 43
43 3.4 43
44 3.7 44
44 3.5 44
44 3.3 44
45 3.7 44
45 3.5 45
45 3.4 45
45 3.2 45
Manifold
Pressure
3.4
3.2
3.7
3.5
3.8
3.6
3.5
3.3
3.8
3.6
3.5
Manifold
Pressure
3.5
3.3
3.8
3.6
3.4
3.6
3.4
3.3
3.8
3.6
3.4
Manifold
Pressure
3.5
3.2
3.7
3.5
3.8
3.6
3.4
3.2
3.7
3.5
3.3