All Data:...............................
is based on fi ring with ambient combustion air.
UA-DA:................................
Published data is reasonably accurate between 1.7 and 8.6 kPa (6.9 and 34.6"w.c.) main air pressure (UA)
if piped with >5 diameters of straight pipe into burner. Square rooting the UA-DA pressure drops using
the published 6.9 kPa (27.7"w.c.) data is reasonably accurate between 1.7-8.6 kPa (6.9-34.6"w.c.) air
pressure. Below 1.7 kPa (6.9"w.c.) the UA-DA data is suspect and should not be used for accurate air
metering. Square rooting will over-estimate air fl ow below 1.7 kPa (6.9"w.c.) and underestimate above
8.6 kPa (34.6"w.c.) .
UG-DG:................................
UG-DG information can be used to approximate fuel gas fl ow. External gas orifi ces or O
2
analysis
should be used for precise determination of fuel metering and air/fuel ratio.
fs - indicates the maximum fl ame supervisory XSAir or XSFuel using either a UV detector or the
specifi ed fl ame rod listed on the 4441 parts list.
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%)
Max % XSAir, fs
Max % XSAir, UV
Max % XSAir, fl ame rod
Max % XSFuel, fs
Max % XSAir, ignition
Max % XSFuel, ignition
Bulletin 4441M
page 4
NATURAL GAS OPERATION
Main Air Pressure, (UA pressure tap), kPa
4441-1 0.2
0.4
1.7
3.9
5.2
6.9
8.6
10.3
Capacity, Nm3/h main air (not burning)
43
Capacity, Nm3/h burner (burning stoich)
5
7
16
24
27
33
37
41
Air
Orifi ce
, (UA-DA) mbar
1.0
1.7
7.2
17.7
24.1
32.8
39.3
48.5
Gas
Orifi ce
, (UG-DG) mbar
0.2
0.5
2.5
5.5
6.2
9.7
12.4
14.9
Tile Pressure, (DG) mbar
1.4
2.2
9.2
20.2
26.9
35.1
44.0
52.3
Max. % XSAir, fs, ignition
400
600
900
2000
2000
2000
2000
2000
Max. % XSFuel, fs
30
30
30
30
30
30
30
30
Max. % XSFuel, ignition
30
30
30
30
30
30
30
30
Flame Length, mm
152
178
178
203
229
254
254
254
Flame Diameter, mm
19
19
19
25
25
25
25
25
4441-2 0.07
0.4
1.7
3.9
5.2
6.9
8.6
10.3
Capacity, Nm3/h main air (not burning)
72
Capacity, Nm3/h burner (burning stoich)
5
12
28
44
51
59
67
72
Air
Orifi ce
, (UA-DA) mbar
0.4
3.1
9.2
22.4
28.4
41.3
52.0
63.0
Gas
Orifi ce
, (UG-DG) mbar
0.1
0.7
3.2
7.5
10.9
16.7
21.1
21.4
Tile Pressure, (DG) mbar
0.5
2.0
7.2
14.7
19.2
24.4
29.9
35.6
Max. % XSAir, fs, ignition
400
600
900
2000
2000
2000
2000
2000
Max. % XSFuel, fs
30
30
30
30
30
30
30
30
Max. % XSFuel, ignition
30
30
30
30
30
30
30
30
Flame Length, mm
152
203
254
254
254
254
279
254
Flame Diameter, mm
25
51
38
38
51
51
51
51
Natural Gas Operation |
Tempest®
