Natural Gas Operation | Tempest®
All Data:............................... is based on firing with ambient combustion air.
UA-DA:................................ Published data is reasonably accurate between 6.9 and 34.6"w.c. (1.7 and 8.6 kPa) main air pressure (UA) if piped with >5 diameters of straight pipe into burner. Square rooting the UA-DA pressure drops using the published 27.7"w.c. (6.9 kPa) data is reasonably accurate between 6.9-34.6"w.c. (1.7-8.6 kPa) air pressure. Below 6.9"w.c. (1.7 kPa) the UA-DA data is suspect and should not be used for accurate air metering. Square rooting will over-estimate air flow below 6.9"w.c. (1.7 kPa) and underestimate above 34.6"w.c. (8.6 kPa). UG-DG:................................ UG-DG information can be used to approximate fuel gas flow. External gas orifices or O 2 analysis should be used for precise determination of fuel metering and air/fuel ratio.
Max % XSAir, fs Max % XSAir, UV Max % XSAir, flame rod Max % XSFuel, fs
fs - indicates the maximum flame supervisory XSAir or XSFuel using either a UV detector or the specified flame rod listed on the 4441 parts list.
Max % XSAir, ignition Max % XSFuel, ignition
ignition - indicates the maximum XSAir or XSFuel at which the integral igniter will light the burner.
DG:...................................... Tile pressures are average values and are subject to considerable variation (±10%)
NOTE: The capacity of the burners has not changed but static pressure has been transitioned to measuring static pressure in imperial units by inches of water column. Previous versions of the bulletin measured static air pressure in ounces per square inch. Conversion: 1 osi = 1.73"w.c.
NATURAL GAS OPERATION Main Air Pressure, (UA pressure tap), "w.c
4441-1
0.9
1.7
6.9
15.6
20.8
27.7
34.6
41.6
Air Flow, not burning (scfh)
1600
Air Flow, (scfh)
200
280
600
900
1025
1250
1400
1550
Air Orifice , UA-DA, (“w.c.) Gas Orifice , UG-DG, (“w.c.)
0.4
0.7
2.9
7.1
9.7
13.2
15.8
19.5
0.1
0.2
1
2.2
2.5
3.9
5
6
Tile Pressure, DG ("w.c.)
0.55
0.9
3.7
8.1
10.8
14.1
17.7
21
Max. % XSAir, fs, ignition
400
600
900
2000
2000
2000
2000
2000
Max. % XSFuel, fs
30 30
30 30
30 30
30 30
30 30
30 30
30 30
30 30
Max. % XSFuel, ignition
Flame Length (in.)
6
7
7
8
9
10
10
10
Flame Diameter (in.)
0.75
0.75
0.75
1
1
1
1
1
4441-2
0.3
1.7
6.9
15.6
20.8
27.7
34.6
41.6
Air Flow, not burning (scfh)
2700
Air Flow, (scfh)
200
450
1040
1650
1890
2200
2500
2700
Air Orifice , UA-DA, (“w.c.) Gas Orifice , UG-DG, (“w.c.)
0.15
1.23
3.7
9
11.4
16.6
20.9
25.3
0.05
0.3
1.3
3
4.4
6.7
8.5
8.6
Tile Pressure, DG ("w.c.)
0.2
0.8
2.9
5.9
7.7
9.8
12
14.3
Max. % XSAir, fs, ignition
400
1500
2000
3000
3000
3000
3000
3000
Max. % XSFuel, fs
30 30
30 30
30 30
30 30
30 30
30 30
30 30
30 30
Max. % XSFuel, ignition
Flame Length (in.)
6
8
10
10
10
10
11
10
Flame Diameter (in.)
1
2
1.5
1.5
2
2
2
2
Bulletin 4441 page 5
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