Sheet 6435-2 Page 4
6435-4
Main Air Pressure, osi
Not Burning Main air, scfh
0.2
1
4
9
16
20
7240
Atom. air, scfh at 30 osi Atom. air, scfh at 8 osi
460 240
Burning Natural Gas Main air, scfh, stoich.
0.2 545 230 905
1
4
9
16
20
1270 230 1630
2830
4350
6050
6900
Atom. air, scfh at 8 osi, stoich.
215
190
160
140
† Total air, scfh, stoich. Gas flow, stoich., scfh
3170
4670
6350
7150
90 0.1
163 0.7
317 2.4
467
635
715
Gas pressure, stoich., osi Flame length, in., stoich. Flame diameter, in., stoich. Tile pressure, osi, stoich.
5.2 20
8.7 20
10.7
11 3
18
20
22
3
3
4
4
5
0.1
0.35
1.3
2.8
4.5
5.5
Max. %XSAir ‡ Stability and flame supervision
75 75
300 300
350 350 200 30+
400 400 400 30+
350 350 250 30+
350 350 250
Ignition--pilot
Ignition--direct spark
Stoich
50
Max. %XSFuel
30+
30+
0
Burning #2 Oil
0.2
1
4
9
16
20
Main air, scfh, stoich.
665 455 1250
1240 440 1810
2750
4310
5850
6590
§ Atom. air, scfh at 30 osi, stoich.
425
415
390
370
† Total air, scfh, stoich. Oil flow, stoich., gph
3305
4855
6370
7090
1.0
1.3 1.0
2.4
3.5
4.6 1.8
5.1 2.1 20
Oil pressure, stoich., psi Flame length, in., stoich. Flame diameter, in., stoich. Tile pressure, osi, stoich.
0.9
1.2
1.5 19
10
10
17
20
3
3
3
4
4
4
0.05
0.4
1.5
3.2
5.6
6.8
Max. %XSAir ‡ Stability and flame supervision
25 25 10
50 50 20
200 200 20+
250 200 20+
300 200
300 200
• Ignition--pilot
Max. %XSFuel
20
0
† Total air is main air plus atomizing air plus 130 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. Cooling air was shut off for ignition and turned back on afterwards. • Direct spark ignition on oil is not considered a viable lighting method due to the lack of repeatability. Velocity: The distance (in inches) from the tile outlet to the point where the tile velocity pressure is 0.1"wc (1259 fpm) is 75" on gas and 85" on oil (firing stoichiometric with 16 osi main air pressure).
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