North American 6423 Dual-Fuel™ Fire• All Burners
Sheet 6423
-- see tables below). An approved 3-way valve must be installed in the line feeding the gas/atomizing air connection to assure that the non-used medium is completely shut off. Gas pressure requirements at the burner are higher than they are for a 4423 Burner, but a standard cross-connected regulator system is satisfactory. PILOT, FLAME SUPERVISION A 4021-12 pilot tip lights the burner satisfactorily with 8-22 osi pilot air pressure (3-10"w.c. mixture pressure.) Use a UV flame detectcor -- flame rods are not satisfactory.
Light oil can be burned as standby or primary fuel in the larger sizes of 4423 Gas Burners by adding a 5423 Atomizer to an existing burner or by specifying a 6423 Dual-Fuel Burner for a new installation. 6423 Burners have the same 4423 "Fire•All" suitablility for a wide variety of industrial furnaces, from low temperature ovens to high temperature forge, heat treat, etc. applications. When burning oil, these burners are not as flexible re air/fuel ratio as they are on gas. But oil operations with 200% excess air can be realized at 12-16 osi main air, somewhat less XSA at lower inputs. Gas goes through the atomizer in a 6423 Burner, so atomizing air is not available when burning gas: Thus, total air capacity is greater when burning oil (by the amount of the atomizing air
See Bulletin 4423/4424 for construction and other characteristics.
Table 1. CAPACITIES, FLAME LENGTHS
flame length, in.
burning oil
burning gas
Burner
designation Btu/h HHV
oil, gph Btu/h HHV
gas,cfh
oil 13 16 18
gas
6423-2
277,000 396,000 475,000
2.1
234,000 354,000 432,000
234 354 432
8
6423-3-A 6423-3-B
3.0 3.6
17 17
based on 132,000 Btu/gallon oil with 16 osi main and atomizing air at the burner. based on 1,000 Btu/cf natural gas with 16 osi main air at the burner (atomizing air not available with burning gas).
Table 2. MAIN AN ATOMIZING AIR CAPACITIES
pressure at burner, osi atomizing air, cfh
pressure at burner, osi main air, cfh
Burner
designation
1
5
6
8
12
16
14
16
20
22
24
6423-2
585 885
1300 1430 1650
2010
2340 3540 4320
440 440 440
470 470 470
525 525 525
550 550 550
575 575 575
6423-3-A 6423-3-B
1980 2160 2500 3050 2410 2640 3050 3720
1080
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