North American 6435 Dual-Fuel Burner Engineering Data
Sheet 6435-2
6435-1
Main Air Pressure, osi
Not Burning Main air, scfh
0.2
1
4
9
16
30
1350
Atom. air, scfh at 30 osi Atom. air, scfh at 8 osi
195
90
Burning Natural Gas Main air, scfh, stoich.
0.2
1
4
9
16
30
65 90
240
545
870
1220
1690
Atom. air, scfh at 8 osi, stoich.
90
90
90
75
50
† Total air, scfh, stoich. Gas flow, stoich., scfh
290
465
770
1100
1430
1870
29
47
77 1.8
110
143 5.6
187
Gas pressure, stoich., osi Flame length, in., stoich. Flame diameter, in., stoich. Tile pressure, osi, stoich.
0.22
0.65
3.25
10.0
2
3
6
8
9
10
1
1
1
1
1
1
0.15
0.4
1.15
2.1
3.5
6.2
Max. %XSAir
‡ Stability and flame supervision
20 20 25
100 100
250 250
400 400
400 400
400 400
Ignition--pilot
Max. %XSFuel
25
25
25
25
0
Burning #2 Oil
0.2
1
4
9
16
30
Main air, scfh, stoich.
85
230 190 555 0.39
545 190
865 185 1180 0.84
1200
1680
§ Atom. air, scfh at 30 osi, stoich.
195 415
180
175
† Total air, scfh, stoich. Oil flow, stoich., gph
870 0.62
1520 1.08 0.35
1990
0.29
1.42
Oil pressure, stoich., psi Flame length, in., stoich. Flame diameter, in., stoich. Tile pressure, osi, stoich.
0.1
0.1
0.1
0.2
0.69
2
2
4
8 2
9 2
11
1
1
1
2
0.08
0.4
1.3
2.4
3.7
6.2
Max. %XSAir ‡ Stability and flame supervision
20 20 25
50 50 25
50 50 25
110 110
200 200
250 250
• Ignition--pilot
Max. %XSFuel
25
25
0
† Total air is main air plus atomizing air plus 135 scfh for pilot air. ‡ Honeywell Ultravision Flame Detector C7027A and Honeywell Flame Supervision Protectorelay RA890G yielded 1.5 micro amps or greater for all above rates. § 30 osi is recommended atomizing air pressure for oil, but all burners will operate on oil with 22 osi atomizing air (at the burner) and 10% or more excess air. • Direct spark ignition on oil is not considered a viable lighting method due to the lack of repeatability. NOTE: Test results above were obtained with pilot air regulated at 2 osi above tile pressure, resulting in constant flow of 135-140 scfh air. Because of the small size of this burner, pilot air must not be run any higher. Velocity: The distance (in inches) from the tile outlet to the point where the tile velocity pressure is 0.1"wc (1259 fpm) is 40" on gas and 48" on oil (firing stoichiometric with 16 osi main air pressure).
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