Bryant 340MAV 用户手册
TABLE 10—MODEL 340MAV ORIFICE SIZE AND MANIFOLD PRESSURE FOR CORRECT INPUT
(Continued)
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.
Only
725
41
3.6
41
3.7
41
3.8
40
3.6
40
3.8
750
42
3.7
42
3.8
41
3.6
41
3.7
41
3.8
4001
775
42
3.5
42
3.6
42
3.7
42
3.8
41
3.6
800
42
3.3
42
3.4
42
3.5
42
3.6
42
3.7
to
825
43
3.7
42
3.2
42
3.3
42
3.4
42
3.5
850
43
3.5
43
3.6
43
3.8
42
3.2
42
3.3
5000
875
43
3.3
43
3.4
43
3.6
43
3.7
43
3.8
900
43
3.1
43
3.3
43
3.4
43
3.5
43
3.6
9%
925
43
3.0
43
3.1
43
3.2
43
3.3
43
3.4
derate
950
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
700
41
3.5
41
3.7
41
3.8
40
3.6
40
3.7
725
42
3.7
42
3.8
41
3.5
41
3.6
41
3.8
750
42
3.4
42
3.5
42
3.7
42
3.8
41
3.5
775
42
3.2
42
3.3
42
3.4
42
3.5
42
3.7
5001
800
43
3.7
43
3.8
42
3.2
42
3.3
42
3.4
825
43
3.5
43
3.6
43
3.7
43
3.8
42
3.2
to
850
43
3.3
43
3.4
43
3.5
43
3.6
43
3.7
875
43
3.1
43
3.2
43
3.3
43
3.4
43
3.5
6000
900
43
2.9
43
3.0
43
3.1
43
3.2
43
3.3
925
43
2.7
43
2.8
43
2.9
43
3.0
43
3.1
950
43
2.6
43
2.7
43
2.8
43
2.9
43
3.0
11%
975
43
2.5
43
2.6
43
2.6
43
2.7
43
2.8
derate
1000
43
2.3
43
2.4
43
2.5
43
2.6
43
2.7
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
650
41
3.8
40
3.6
40
3.7
40
3.8
39
3.7
675
41
3.5
41
3.6
41
3.7
40
3.6
40
3.7
6001
700
42
3.6
42
3.7
41
3.5
41
3.6
41
3.7
725
42
3.4
42
3.5
42
3.6
42
3.7
42
3.8
to
750
43
3.8
42
3.3
42
3.4
42
3.5
42
3.6
775
43
3.6
43
3.7
43
3.8
42
3.3
42
3.4
7000
800
43
3.4
43
3.5
43
3.6
43
3.7
43
3.8
825
43
3.2
43
3.3
43
3.4
43
3.5
43
3.6
13%
850
43
3.0
43
3.1
43
3.2
43
3.3
43
3.4
derate
875
43
2.8
43
2.9
43
3.0
43
3.1
43
3.2
*Orifice numbers shown in BOLD are factory installed.
Percents of derate are based on midpoints of U.S. altitude ranges.
—42—