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TABLE 8—MODEL 373LAV ORIFICE SIZE† AND MANIFOLD PRESSURE FOR CORRECT INPUT
(Tabulated Data Based on 23,000 BTUH Per Burner, Derated 4 Percent per 1000 Ft Above Sea Level)*
AVG GAS
ALTITUDE
HEAT VALUE
RANGE
AT ALTITUDE
(FT)
(BTU/CU FT)
700
725
750
775
5001
800
825
to
850
875
6000
900
925
950
975
1000
AVG GAS
ALTITUDE
HEAT VALUE
RANGE
AT ALTITUDE
(FT)
(BTU/CU FT)
650
675
700
6001
725
750
to
775
800
7000
825
850
875
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
* For size 060135 only, input is 22,500 Btuh per burner. Deduct 0.1-in. wc from manifold pressure shown in table. Change orifice size if manifold pressure falls below 3.2-in.
wc on altitudes up to 2000 ft, otherwise change orifice size if manifold pressure falls below 2.0-in. wc.
† Orifice sizes shown in BOLD are factory installed.
0.58
0.60
Orifice
Manifold
Orifice
No.
Pressure
No.
43
3.7
43
43
3.4
43
43
3.2
43
43
3.0
43
43
2.8
43
43
2.7
43
43
2.5
43
43
2.4
43
43
2.2
43
43
2.1
43
48
3.8
43
48
3.6
48
48
3.4
48
0.58
0.60
Orifice
Manifold
Orifice
No.
Pressure
No.
43
3.7
43
43
3.4
43
43
3.2
43
43
3.0
43
43
2.8
43
43
2.6
43
43
2.4
43
43
2.3
43
43
2.2
43
43
2.0
43
0.58
0.60
Orifice
Manifold
Orifice
No.
Pressure
No.
43
3.4
43
43
3.2
43
43
3.0
43
43
2.7
43
43
2.6
43
43
2.4
43
43
2.2
43
43
2.1
43
48
3.7
43
48
3.5
48
0.58
0.60
Orifice
Manifold
Orifice
No.
Pressure
No.
43
3.2
43
43
3.0
43
43
2.7
43
43
2.5
43
43
2.4
43
43
2.2
43
43
2.0
43
48
3.6
48
48
3.4
48
—17—
SPECIFIC GRAVITY OF NATURAL GAS
0.62
Manifold
Orifice
Manifold
Pressure
No.
Pressure
3.8
42
3.2
3.6
43
3.7
3.3
43
3.4
3.1
43
3.2
2.9
43
3.0
2.7
43
2.8
2.6
43
2.7
2.4
43
2.5
2.3
43
2.4
2.2
43
2.3
2.1
43
2.1
3.7
43
2.0
3.5
48
3.6
SPECIFIC GRAVITY OF NATURAL GAS
0.62
Manifold
Orifice
Manifold
Pressure
No.
Pressure
3.8
42
3.2
3.5
43
3.7
3.3
43
3.4
3.1
43
3.2
2.9
43
3.0
2.7
43
2.8
2.5
43
2.6
2.4
43
2.5
2.2
43
2.3
2.1
43
2.2
SPECIFIC GRAVITY OF NATURAL GAS
0.62
Manifold
Orifice
Manifold
Pressure
No.
Pressure
3.6
43
3.7
3.3
43
3.4
3.1
43
3.2
2.8
43
2.9
2.6
43
2.7
2.5
43
2.6
2.3
43
2.4
2.2
43
2.2
2.0
43
2.1
3.6
48
3.7
SPECIFIC GRAVITY OF NATURAL GAS
0.62
Manifold
Orifice
Manifold
Pressure
No.
Pressure
3.3
43
3.4
3.1
43
3.2
2.8
43
2.9
2.6
43
2.7
2.4
43
2.5
2.3
43
2.3
2.1
43
2.2
3.7
43
2.1
3.5
48
3.6
(Continued)
0.64
0.66
Orifice
Manifold
Orifice
No.
Pressure
No.
42
3.3
42
43
3.8
42
43
3.5
43
43
3.3
43
43
3.1
43
43
2.9
43
43
2.8
43
43
2.6
43
43
2.5
43
43
2.3
43
43
2.2
43
43
2.1
43
48
3.7
43
0.64
0.66
Orifice
Manifold
Orifice
No.
Pressure
No.
42
3.3
42
43
3.8
42
43
3.5
43
43
3.3
43
43
3.1
43
43
2.9
43
43
2.7
43
43
2.5
43
43
2.4
43
43
2.3
43
0.64
0.66
Orifice
Manifold
Orifice
No.
Pressure
No.
43
3.8
42
43
3.5
43
43
3.3
43
43
3.0
43
43
2.8
43
43
2.6
43
43
2.5
43
43
2.3
43
43
2.2
43
43
2.1
43
0.64
0.66
Orifice
Manifold
Orifice
No.
Pressure
No.
43
3.5
43
43
3.3
43
43
3.0
43
43
2.8
43
43
2.6
43
43
2.4
43
43
2.3
43
43
2.1
43
48
3.7
43
Manifold
Pressure
3.4
3.2
3.6
3.4
3.2
3.0
2.8
2.7
2.5
2.4
2.3
2.2
2.1
Manifold
Pressure
3.5
3.2
3.6
3.4
3.2
3.0
2.8
2.6
2.5
2.3
Manifold
Pressure
3.2
3.6
3.4
3.1
2.9
2.7
2.5
2.4
2.2
2.1
Manifold
Pressure
3.6
3.4
3.1
2.9
2.7
2.5
2.3
2.2
2.0
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