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Bryant GAMA 331JAV Installation And Operating Instructions Manual page 18

Series b downflow 2-speed, 2-stage, induced-combustion gas-fired furnace
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TABLE 9—MODEL 331JAV ORIFICE SIZE AND MANIFOLD PRESSURE FOR CORRECT INPUT
(TABULATED DATA BASED ON 21,000 BTUH HIGH HEAT/13,500 BTUH LOW HEAT PER BURNER,
AVG GAS
ALTITUDE
HEAT VALUE
RANGE
AT ALTITUDE
(FT)
(BTU/CU FT)
625
650
675
7001
700
725
to
750
775
8000
800
825
850
AVG GAS
ALTITUDE
HEAT VALUE
RANGE
AT ALTITUDE
(FT)
(BTU/CU FT)
600
625
8001
650
675
to
700
725
9000
750
775
800
AVG GAS
ALTITUDE
HEAT VALUE
RANGE
AT ALTITUDE
(FT)
(BTU/CU FT)
575
600
9001
625
650
to
675
700
10,000
725
750
775
DERATED 4% FOR EACH 1000 FT ABOVE SEA LEVEL)
0.58
0.60
Manifold
Orifice
Orifice
Pressure
No.
No.
High/Low
44
3.3/1.4
44
45
3.7/1.5
45
46
3.6/1.5
46
47
3.8/1.6
46
47
3.5/1.5
47
48
3.7/1.5
47
48
3.5/1.5
48
48
3.3/1.4
48
49
3.6/1.5
49
49
3.4/1.4
49
0.58
0.60
Manifold
Orifice
Orifice
Pressure
No.
No.
High/Low
45
3.7/1.5
44
46
3.6/1.5
46
47
3.8/1.6
46
47
3.5/1.4
47
48
3.7/1.5
48
48
3.4/1.4
48
49
3.8/1.6
48
49
3.5/1.5
49
49
3.3/1.4
49
0.58
0.60
Manifold
Orifice
Orifice
Pressure
No.
No.
High/Low
46
3.6/1.5
46
47
3.7/1.5
46
47
3.4/1.4
47
48
3.6/1.5
48
48
3.4/1.4
48
49
3.7/1.5
49
49
3.4/1.4
49
50
3.8/1.6
49
50
3.5/1.5
50
SPECIFIC GRAVITY OF NATURAL GAS
0.62
Manifold
Manifold
Orifice
Pressure
Pressure
No.
High/Low
High/Low
3.4/1.4
44
3.5/1.5
3.8/1.6
44
3.3/1.3
3.7/1.5
46
3.8/1.6
3.4/1.4
46
3.6/1.5
3.6/1.5
47
3.8/1.6
3.4/1.4
47
3.5/1.5
3.6/1.5
48
3.8/1.6
3.4/1.4
48
3.5/1.5
3.8/1.6
48
3.3/1.4
3.5/1.5
49
3.7/1.5
SPECIFIC GRAVITY OF NATURAL GAS
0.62
Manifold
Manifold
Orifice
Pressure
Pressure
No.
High/Low
High/Low
3.2/1.3
44
3.3/1.4
3.7/1.5
46
3.8/1.6
3.4/1.4
46
3.5/1.5
3.6/1.5
47
3.7/1.5
3.8/1.6
47
3.5/1.4
3.6/1.5
48
3.7/1.5
3.3/1.4
48
3.4/1.4
3.7/1.5
49
3.8/1.6
3.4/1.4
49
3.5/1.5
SPECIFIC GRAVITY OF NATURAL GAS
0.62
Manifold
Manifold
Orifice
Pressure
Pressure
No.
High/Low
High/Low
3.7/1.5
46
3.8/1.6
3.4/1.4
46
3.5/1.5
3.6/1.5
47
3.7/1.5
3.8/1.6
47
3.4/1.4
3.5/1.4
48
3.6/1.5
3.8/1.6
48
3.3/1.4
3.5/1.5
49
3.7/1.5
3.3/1.4
49
3.4/1.4
3.7/1.5
50
3.8/1.6
—18—
Continued
0.64
0.66
Manifold
Orifice
Orifice
Pressure
No.
No.
High/Low
44
3.6/1.5
44
44
3.4/1.4
44
45
3.8/1.6
44
46
3.7/1.5
46
46
3.4/1.4
46
47
3.6/1.5
47
47
3.4/1.4
47
48
3.6/1.5
48
48
3.4/1.4
48
49
3.8/1.6
48
0.64
0.66
Manifold
Orifice
Orifice
Pressure
No.
No.
High/Low
44
3.4/1.4
44
45
3.8/1.6
44
46
3.7/1.5
46
47
3.8/1.6
46
47
3.6/1.5
47
48
3.8/1.6
47
48
3.5/1.5
48
48
3.3/1.4
48
49
3.7/1.5
49
0.64
0.66
Manifold
Orifice
Orifice
Pressure
No.
No.
High/Low
45
3.8/1.6
44
46
3.6/1.5
46
47
3.8/1.6
46
47
3.5/1.5
47
48
3.7/1.5
48
48
3.5/1.4
48
49
3.8/1.6
48
49
3.5/1.5
49
49
3.3/1.4
49
Manifold
Pressure
High/Low
3.7/1.5
3.5/1.4
3.2/1.3
3.8/1.6
3.5/1.5
3.7/1.5
3.5/1.4
3.7/1.5
3.5/1.5
3.3/1.4
Manifold
Pressure
High/Low
3.5/1.4
3.2/1.3
3.8/1.6
3.5/1.4
3.7/1.5
3.4/1.4
3.7/1.5
3.4/1.4
3.8/1.6
Manifold
Pressure
High/Low
3.2/1.3
3.8/1.6
3.5/1.4
3.6/1.5
3.8/1.6
3.6/1.5
3.3/1.4
3.6/1.5
3.4/1.4

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