Download Series 100 - HVACpartners

TABLE 11—Orifice Size* and Manifold Pressure For Gas Input Rate
(Tabulated Data Based On 21,000 Btuh Per Burner, Derated 4 Percent For Each 1000 Ft Above Sea Level)
U.S.A. and Canada
ALTITUDE
RANGE
(FT)
AVG GAS
HEAT VALUE
(BTU/CU FT)
0
to
2000
U.S.A. and Canada
ALTITUDE
RANGE
(FT)
AVG GAS
HEAT VALUE
(BTU/CU FT)
U.S.A.
Altitudes
2001
to
3000
or
Canada
Altitudes
2000
to
4500
ALTITUDE
RANGE
(FT)
U.S.A. Only
800
825
850
875
900
925
950
975
1000
AVG GAS
HEAT VALUE
(BTU/CU FT)
775
800
825
850
875
900
925
950
3001
to
4000
ALTITUDE
RANGE
(FT)
U.S.A. Only
900
925
950
975
1000
1025
1050
1075
1100
AVG GAS
HEAT VALUE
(BTU/CU FT)
4001
to
5000
750
775
800
825
850
875
900
925
SPECIFIC GRAVITY OF NATURAL GAS
0.60
0.62
Orifice
Manifold
Orifice
Manifold
No.
Pressure
No.
Pressure
0.58
Orifice
Manifold
No.
Pressure
42
43
43
43
44
44
44
45
46
Orifice
No.
43
43
43
43
43
43
43
43
43
Orifice
No.
43
43
43
43
43
43
43
43
Orifice
No.
43
43
43
43
43
43
43
43
3.2
3.7
3.5
3.3
3.6
3.4
3.3
3.8
3.8
42
3.3
42
3.4
43
3.8
42
3.2
43
3.6
43
3.7
43
3.4
43
3.5
43
3.3
43
3.4
44
3.6
43
3.2
44
3.4
44
3.5
44
3.2
44
3.3
45
3.7
44
3.2
SPECIFIC GRAVITY OF NATURAL GAS
0.60
0.62
Orifice
Manifold
Orifice
Manifold
No.
Pressure
No.
Pressure
0.58
Manifold
Pressure
3.8
3.5
3.3
3.2
3.0
2.8
2.7
2.5
2.4
42
3.2
42
3.3
43
3.7
43
3.8
43
3.5
43
3.6
43
3.3
43
3.4
43
3.1
43
3.2
43
2.9
43
3.0
43
2.8
43
2.9
43
2.6
43
2.7
43
2.5
43
2.6
SPECIFIC GRAVITY OF NATURAL GAS
0.60
0.62
Orifice
Manifold
Orifice
Manifold
No.
Pressure
No.
Pressure
0.58
Manifold
Pressure
3.5
3.3
3.1
2.9
2.8
2.6
2.5
2.4
43
3.7
43
3.8
43
3.4
43
3.5
43
3.2
43
3.3
43
3.0
43
3.1
43
2.9
43
3.0
43
2.7
43
2.8
43
2.6
43
2.7
43
2.4
43
2.5
SPECIFIC GRAVITY OF NATURAL GAS
0.60
0.62
Orifice
Manifold
Orifice
Manifold
No.
Pressure
No.
Pressure
0.58
Manifold
Pressure
3.3
3.1
2.9
2.7
2.6
2.4
2.3
2.2
43
43
43
43
43
43
43
43
* Orifice numbers 43 are factory installed
41
3.4
3.2
3.0
2.8
2.7
2.5
2.4
2.2
43
43
43
43
43
43
43
43
3.5
3.3
3.1
2.9
2.8
2.6
2.5
2.3
Orifice
No.
42
42
43
43
43
43
43
44
44
Orifice
No.
42
42
43
43
43
43
43
43
43
Orifice
No.
42
43
43
43
43
43
43
43
Orifice
No.
43
43
43
43
43
43
43
43
0.64
Manifold
Pressure
3.5
3.3
3.8
3.7
3.5
3.3
3.2
3.4
3.3
0.64
Manifold
Pressure
3.4
3.2
3.7
3.5
3.3
3.1
2.9
2.8
2.7
0.64
Manifold
Pressure
3.2
3.7
3.4
3.2
3.1
2.9
2.7
2.6
0.64
Manifold
Pressure
3.6
3.4
3.2
3.0
2.8
2.7
2.5
2.4