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
4441-1 HV Air Pressure UA osi ("w.c.) Air Flow, not burning (scfh)
0.5 (0.9")
1 (1.7")
4 (6.9")
9 (15.6") 16 (27.7")
20 (34.6")
1650 1200
Air Flow (scfh)
200
300
580
880
1350
Air Orifice , UA-DA, (in.w.c.) Gas Orifice , UG-DG, (in.w.c.)
0.4
0.6 0.3
2.3 0.8 4.4
5.3
9.8 3.2 17.3
12.2
0.1
1.7 10
4
Tile Pressure DG (in.w.c.) Max. % XSAir, fs, ignition
0.55 400
1
21.6
600
900
2000
1500
2000
Max. % XSFuel, fs
30 30
30 30
30 30
30 30
30 30
30 30
Max. % XSFuel, ignition Flame Length (in.) Flame Diameter (in.)
6
8
7
8
8
9
0.75
1
1
1
1
1
4441-1 MV Air Pressure UA osi ("w.c.) Air Flow, not burning (scfh)
0.2 (0.3")
1 (1.7")
4 (6.9")
9 (15.6") 16 (27.7")
1800 1700
Air Flow (scfh)
220 0.25
400
850
1250
Air Orifice , UA-DA, (in.w.c.) Gas Orifice , UG-DG, (in.w.c.)
1.3
5.3
12.1 3.8 2.8
21.6
0.1
0.4 0.3
1.7 1.2
6.7 4.9
Tile Pressure DG (in.w.c.) Max. % XSAir, fs, ignition
0.07 300
600
900
2000
1900
Max. % XSFuel, fs
30 30
30 30 10 1.5
30 30
30 30
30 30
Max. % XSFuel, ignition Flame Length (in.) Flame Diameter (in.)
10
11
12
12
2
1.5
1.5
1.5
Sheet 4441-1 page 4
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