Product Overview | Small Fire•All™ Gas Burners
FLAME SUPERVISION and LIGHTING Flame Supervision. Use a UV detector with an adapter from Bulletin 8832. Flame rod supervision is not recommended. Flame supervision is strongly recommended for any application that will be below 1400°F during any part of its cycle. When flame supervision is used, pilots must be interrupted: Pilot is automatically turned off within 10 seconds of main flame ignition so detector monitors main flame only. A 4011-12 pilot set is recommended for individual burner ignition. When multiple burners share a single pilot pre-mix header, a 4021-12 pilot tip per burner with an appropriately sized air/gas mixer is recommended. DIRECT SPARK The burner can be direct spark ignited with either the 4055 Direct Spark Igniter (4055-D for -0 burner sizes, and 4055-C for -1 thru -3 burner sizes), or the 4051 Air Assisted Igniter (4051-D for -0 burner sizes, and 4051-C for -1 thru -3 burner sizes). The 4051 Air Assisted Igniter is recommended because it ignites the burners over a wider operating range. If using direct spark ignition of main flame, use standard 6000 volt transformer. Half-wave ignition transformer can be used only with the 4055.
Fire•All™ Burners are used on almost any kind of industrial furnace from low temperature air heaters to kilns and forge furnaces that operate in 2000-2400°F ranges. 4423 nozzle-mix burners are the small version of North American’s famous 4422 series. They provide medium velocity flames with wide air/fuel ratio and turndown flexibility. For applications above 1900°F, the 4424 modification is recommended . CONTROL The most common control scheme uses a cross connected atmospheric regulator (zero governor). On lower temperature installations, fuel-only control is frequently used to take advantage of superior convection heat transfer and uniformity afforded by excess air operation. More economical gas utilization can be realized by using a 7216 Variable Ratio Regulator, which allows correct air/fuel ratio at high fire but reduces gas faster than air on turndown. CONSTRUCTION Cast iron bodies and gas connections. Prefired refractory tiles suitable for 2950°F maximum tile temperature. 4423 air tubes are stainless steel. 4424 tubes are Inconel, with a refractory biscuit around them. Carbon steel tile jackets are used where there is no supporting refractory adjacent to the tile: Specify an "LC" suffix. Maximum jacket temperature 800°F. For higher temperature alloy jackets, consult North American. All burners have an observation port in the back of the gas connection, and provision for pilot and flame detector.
Combustion Air Capacities in scfh (for Btu/h HHV, multiply by 100) air pressure at burner in osi
flame length stoichiometric
max. excess air, % *
Burner
ratio 8 osi
designation
0.2
1
5
6
8
12
16
1 osi 9 osi 16 osi
4423- & 4424-0 4423- & 4424-1 4423- & 4424-2 4423- & 4424-3-A 4423- & 4424-3-B
70
155 315
350 705
380 770
440
540
630
6" 9"
170 165
120 255 455 730 900
100 285 455 670 730
140 260 395
890 1090 1650 2010
1260 2340 3540 4320
585 1300 1430
14" 20" 20"
730 900 900
885 1980 2160 2500 3050
480 1080 2410 2640 3050 3720
* XSA rates shown for 4423 Burners. They are somewhat less for the 4424 modification, used on high temperature applications that normally do not require high excess air rates.
Bulletin 4423/4424 Page 2
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