Sheet 6435-2 Page 5
6435-5
Main Air Pressure, osi
Not Burning
0.2
1
4
9
16
20
Main air, scfh
12 100
Atom. air, scfh at 30 osi Atom. air, scfh at 16 osi
700 s
520
Burning Natural Gas
0.2
1
4
9
16
20
Main air, scfh, stoich.
895
2060
4460
6950
9500
520
510
485
450
400
Atom. air, scfh at 16 osi, stoich.
† Total air, scfh, stoich. Gas flow, stoich., scfh
1600
2760
5150
7600
10 100
160
276 0.8
515 2.8
760
1 010
Gas pressure, stoich., osi Flame length, in., stoich. Flame diameter, in., stoich. Tile pressure, osi, stoich.
0.1
6.3
10.8
12
18
19
19
19
4
4
5
6
6
0.1
0.4
1.4
3.5
5.8
Max. %XSAir ‡ Stability and flame supervision
20 20 20 30
250 250
400 400
350 325
350 200 100
Ignition--pilot
Ignition--direct spark
65 30
60 30
75 30
Max. %XSFuel
10
Burning #2 Oil
0.2
1
4
9
16
20
Main air, scfh, stoich.
895
2110
4760
7450
10 000
695
690
670
640
585
§ Atom. air, scfh at 30 osi, stoich.
† Total air, scfh, stoich. Oil flow, stoich., gph
1780
2990
5620
8280
10 775
1.1
2
3.9
5.8 1.6
7.6 1.8 24
Oil pressure, stoich., psi Flame length, in., stoich. Flame diameter, in., stoich. Tile pressure, osi, stoich.
1.0
1.2
1.4 24
10
14
24
3
4
5
6
6
0.08
0.5
1.3
2.8
5.2
Max. %XSAir ‡ Stability and flame supervision
25 25
125 125 20+
275 275
300 225
350 150
• Ignition--pilot
-Max. %XSFuel
20+
20
20
20
† Total air is main air plus atomizing air plus 190 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.
Electrode setup used was that shown in drawing B4-7249. The cooling air was left on for the ignition tests. • Direct spark ignition on oil is not considered a viable lighting method due to the lack of repeatability.
Figure includes 110 scfh air for cooling on spark for #2 oil. Figure includes 75 scfh air for cooling on spark for natural gas.
Velocity: The distance (in inches) from the tile outlet to the point where the tile velocity pressure is 0.1"wc (1259 fpm) is 130" on gas and 130" on oil (firing stoichiometric with 16 osi main air pressure).
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