Bryant 340MAV Installation, Start-Up, And Operating Instructions Manual page 40

TABLE 9—MODEL 340MAV 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)
625
650
7001 675
700
to 725
750
8000 775
800
15% 825
derate 850
AVG GAS
ALTITUDE
HEAT VALUE
RANGE
AT ALTITUDE
(FT)
(BTU/CU FT)
600
8001 625
650
to 675
700
9000 725
750
17% 775
derate 800
AVG GAS
ALTITUDE
HEAT VALUE
RANGE
AT ALTITUDE
(FT)
(BTU/CU FT)
575
9001 600
625
to 650
675
10,000 700
725
19% 750
derate 775
*Orifice numbers shown in BOLD are factory installed.
Percents of derate are based on midpoints of U.S. altitude ranges.
FOR USE WITH 040 THROUGH 120 SIZE FURNACES ONLY
0.58 0.60
Orifice Manifold Orifice
No. Pressure No.
43 3.8 42
43 3.5 43
44 3.8 43
44 3.5 44
44 3.3 44
45 3.7 45
45 3.5 45
45 3.3 45
45 3.1 45
45 2.9 45
0.58 0.60
Orifice Manifold Orifice
No. Pressure No.
43 3.8 42
43 3.5 43
44 3.7 43
44 3.5 44
44 3.2 44
45 3.6 45
45 3.4 45
45 3.2 45
45 3.0 45
0.58 0.60
Orifice Manifold Orifice
No. Pressure No.
43 3.8 42
43 3.5 43
44 3.7 44
44 3.4 44
45 3.8 44
45 3.6 45
45 3.3 45
45 3.1 45
45 2.9 45
—40—
SPECIFIC GRAVITY OF NATURAL GAS
0.62
Manifold Orifice Manifold
Pressure No. Pressure
3.3 42 3.4
3.7 43 3.8
3.4 43 3.5
3.6 44 3.8
3.4 44 3.5
3.8 44 3.3
3.6 45 3.7
3.4 45 3.5
3.2 45 3.3
3.0 45 3.1
SPECIFIC GRAVITY OF NATURAL GAS
0.62
Manifold Orifice Manifold
Pressure No. Pressure
3.3 42 3.4
3.6 43 3.8
3.4 43 3.5
3.6 44 3.7
3.3 44 3.4
3.8 44 3.2
3.5 45 3.6
3.3 45 3.4
3.1 45 3.2
SPECIFIC GRAVITY OF NATURAL GAS
0.62
Manifold Orifice Manifold
Pressure No. Pressure
3.2 42 3.3
3.6 43 3.7
3.8 43 3.5
3.5 44 3.7
3.3 44 3.4
3.7 45 3.8
3.4 45 3.6
3.2 45 3.3
3.0 45 3.1
(Continued)
0.64 0.66
Orifice Manifold Orifice
No. Pressure No.
42 3.5 42
42 3.2 42
43 3.6 43
43 3.4 43
44 3.6 44
44 3.4 44
45 3.8 44
45 3.6 45
45 3.4 45
45 3.2 45
0.64 0.66
Orifice Manifold Orifice
No. Pressure No.
42 3.5 42
42 3.2 42
43 3.6 43
44 3.8 43
44 3.6 44
44 3.3 44
45 3.8 44
45 3.5 45
45 3.3 45
0.64 0.66
Orifice Manifold Orifice
No. Pressure No.
42 3.5 42
42 3.2 42
43 3.6 43
44 3.8 43
44 3.5 44
44 3.3 44
45 3.7 45
45 3.4 45
45 3.2 45
Manifold
Pressure
3.6
3.3
3.7
3.5
3.7
3.5
3.3
3.7
3.5
3.3
Manifold
Pressure
3.6
3.3
3.7
3.4
3.7
3.4
3.2
3.6
3.4
Manifold
Pressure
3.6
3.3
3.7
3.4
3.6
3.4
3.8
3.5
3.3