Product Overview | 4425 Fire•All™
A flame rod or ultraviolet (UV) detector can be installed in one of three holes in the body, using an adapter listed in Bulletin 8832. UV scanners allow ignition with up to 14 osi main air. If flame rods are used, 4425-2 through -6 Burners must be ignited at 1 osi or more main air. Do not apply flame rods to -7 and -8 size burners. When using flame supervision, an interrupted pilot is required--do not use constant or intermittent pilots. Startup and Adjustment: Refer to Bulletin GB-M1 for startup and adjustment of a nozzle-mix burner with ratio regulator air/fuel ratio control. HIGH VELOCITY TILES 4425- -MB Burners have a 13½" "Milk Bottle" tile with reduced outlet; they produce higher velocity flames than the standard burner, also offer somewhat better protection for burner internals from furnace radiation. Good tile installation practice is important with any burner (see Supplements DF-M1 and -M2). It is critical with Milk Bottle tiles because of higher pressures developed in the tile, which can cause burner and furnace wall damage if not properly sealed into the wall.
4425 Fire•All TM Burners are designed specifically for higher temperature operations such as forge furnaces, ceramic kilns, metal and glass melters, heat treat furnaces, etc. They are the high temperature version of North American’s 4422 Fire•All TM Burner, one of the most widely used industrial burners in the world. 4425's are particularly appropriate for applications that run at both high and low temperatures--an example is a batch type kiln in which early parts of the cycle run below 1200°F and require free oxygen in kiln atmosphere for raw material to process properly; then frequently the product must "soak" at temperatures above 2000°F. 4425 Burners handle this duty with ease due to their excess air flexibility and their construction that withstands radiant heat. CONSTRUCTION Metal parts are shielded by refractory: the tile and an insulating refractory "biscuit" covering face of burner. Mounting plate and burner body are made of heat resistant cast iron. Air tubes are high grade alloy. In furnace chambers above 2000°F, combustion air should not be turned down below 2 osi (with or without gas on). LIGHTING AND FLAME SUPERVISION A 4011 Pilot Set is normally used to light 4425 Burners. A manual torch can be used in some applications. The burner can be direct spark ignited with either the 4055 Direct Spark Igniter (4055- D for 4425-2 through -6 and 4055-B for 4425-7 and -8 sizes) or the 4051-D Air Assisted Igniter. 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 transformers can be used only with the 4055.
Maximum % excess air
Air pressure across burner in osi
Burner designation
1
4
8
16
4425-2 4425-3 4425-4 4425-5 4425-6
850
1750
860
1250 1675 1500
1500 1400
2000 1780
1500
1100
620 730
570
490 730
460 410
1080
4425-6-B 4425-7-A 4425-7-B 4425-8-A
1030
850
630
450
2000 4000 1000
450 500
2700 2000
1200 2460
875
2210
1350
Combustion air capacities in scfh (for Btu/h HHV, multiply by 100) Air pressure across the burner in osi
Approx. flame lengths with 16 osi main air (in open furnace)
Burner
designation
0.1
1
5
6
8
12
16
4425-2 4425-3 4425-4 4425-5 4425-6
160 280 460 750
520 890
1 160 1 980 3 240 5 300 8 300
1 270 2 160 3 540 5 800 9 100
1 470 2 500 4 100 6 700
1 800 3 050 5 000 8 150 12 900 14 500 22 700 28 200 36 700
2 100 3 550 5 800 9 450
1'
1 ½ '
1 450 2 370 3 700
2' 3' 3' 4' 6' 6' 7'
1180 1330 2070 2550 3350
10 500 11 900 18 500 23 000 30 000
14 800 16 900 26 200 32 600 42 400
4425-6-B 4425-7-A 4425-7-B 4425-8-A
4200
9400
10 300 16 000 19 900 26 000
6 550 14 600
8 150
18 200
10 600 23 700
All ratings are based on operation without pilot in a cold open furnace. Burners can be lighted at any of the ratings listed. If a thicker refractory "biscuit" is used for higher temperature service, excess air limits are lower.
Bulletin 4425 Page 2
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