Combustion Catalog | Fives North American

Product Overview | 4020 Nozzle-Mix Pilot Tip

The 4020 Nozzle-Mix Pilots are used to light burners as alter- natives to raw gas pilots or gas boosted premix pilot tips. In addition, they can be used as small burners. Nozzle-mix pilots operate with a wider stability range and with fewer components (such as mixers and boost gas tubes) to offer the ultimate price/ performance ratio. To serve a wide range of applications, the pi- lot tip body is availabe from ¾ " to 4" and in three different styles: Low Pressure (LP), High Pressure (HP), and Cool Boss (CB). 4020 Pilots are not recommended for the 4796/6796 Magna- Flame Burner. See individual burner literature for recommended pilots. The "LP" version, designed to be used in place of some raw gas pilots, is an ultra low pressure pilot requiring air pressures between 0.1 and 1 osi. The "HP" version requires 1-16 osi of air pressure and can operate with a cross connected pilot regulator. The "CB" version has extra air passages to keep the mounting boss cool and operates with the same air pressure requirements as the "HP" version. The -6 and -7 pilot bodies are "sandwiched" between the metal tile and a four bolt flange. The -6 and -7 pilot bodies are "sandwiched" between a four bolt air inlet flange and a replaceable metal tile. The -6 and -7 sizes are available with an optional reduced exit size. This allows a larger pilot to be mounted on a smaller pilot boss. Use these reduced exit 4020- 6/5, -6/4 or -7/6 size pilots when a stronger/higher capacity/ higher velocity pilot flame is needed. Two spark plug locations are provided on all 4020 sizes: one beside the gas inlet port and one opposite the gas port. Three ignition options are available. The standard 10 mm spark plug

(R240-2465) is provided with each tip and is recommended for use with pilots that are set rich, or when high burner backpres- sures are present. The optional 10 mm air purged spark (4-5635- 1) is recommended for pilots that continuously fire for extended periods. For manual lighting, use an OA2-0401-1 slotted torch lighting plug.

"LP" Low Pressure (use in place of raw gas pilot)

The "LP" style is used when only low pressure air is available; for example, a burner with inlet vortex control on the blower. The air for the pilot tip can be piped from the body of the main burner. The air pressure across the pilot tip can be set very low, 0.1 osi is often adequate if the main burner air pressure is also as low. Because a small amount of gas is pre-mixed into the air, it is important that the gas pressure be 2-6 times as high as the air pressure to insure good pilot stability. Always install a pressure tap in the air and gas lines at the pilot tip to check for suitable pressures. As with raw gas pilots, the "LP" works best if the main burner is always lit with the same pressure conditions as when adjusting the pilot. If the low fire burner start rate is changed, the pilot adjustment must be checked. Be aware that the "LP" will burn at high excess air conditions as well as high excess fuel conditions. Do not use a cross connected ratio regulator with the "LP". Burners with high swirl can pull the pilot away from the view of a flame detector.

4" 4020-HP Nozzle-Mix Pilot Tip 100% excess fuel 8 osi air pressure

2 ½ " 4020-HP Nozzle-Mix Pilot Tip 100% excess fuel 8 osi air pressure

1 ¼ " 4020-LP Nozzle-Mix Pilot Tip 100% excess fuel 0.1 osi air pressure

Bulletin 4020 Page 2

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