North American 6833-25 Dual-Fuel ™ Flat Flame Burners
Sheet 6833-1
Standard cast burner tiles are rated for 3000°F furnace temperature. Higher temperature materials are available. Ignition. 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. The atomizer design permits ratio control by a cross-connected 7052 Ratiotrol ™ . If the atomizer is left in the burner when burning gas, protect it from overheating with 2 psi atomizing air. Flame Supervision. Use a UV Flame Detector and an adapter with a B suffix. Provide 100 cfh of cleaning air at 16 osi from main air, mak- ing the connection downstream of the control valve. (An 8699-01 Balancing Orifice with #26 drill will pass about 100 cfh of air at 16 osi.) Cleaning air must be turned down with main air for best flame signal.
6833 Burner Complete shown with optional (recommended) Sensitrol™ Oil Valve.
6833-25 Dual-Fuel Flat Flame Burners incorporate 5625 Compressed Air Atomizers and main air discs designed for higher turndown, better flame shape, and wider stability limits than available with the former 6832 Burners. They operate on gas or distillate oil.
TABLE 1. Main and atomizing air capacities
Burner
Main air, cfh
Atomizing air, cfh
designation
1 osi
4 osi
9 osi
16 osi
Gas (2 psi)
Oil (8 psi)
6833-3-25 6833-4-25 6833-5-25 6833-6-25
825
1650 2720 4560
2480 4080 6840
3 300 5 300 9 000 14 500
100 100 130
200 200 260
1360 2280
—
—
—
92
350 (at 17 psi)
TABLE 2. Maximum % excess air
Burner
Gas, main air at osi
Oil, Main air at osi
designation
1
4
9
16
1
4
9
16
6833-3-25 6833-4-25 6833-5-25 6833-6-25
220 100 170 200
130 110
100
80 60 60 25
5
60 90
40 60
30 20 80 50
90 70
45
80
200
250
100
—
—
50
—
—
TABLE 3. Maximum % excess fuel
Burner
Gas, main air at osi
Oil, Main air at osi
designation
1
4
9
16
1
4
9
16
6833-3-25 6833-4-25 6833-5-25 6833-6-25
5
20 20 — —
15
10 10 —
5
10 10 — —
10 10 — —
10 10 10 10
20 — 20
20 — —
10 — 10
15
Made with FlippingBook flipbook maker