OIL AND DUAL FUEL SYSTEMS
combustion air
air
gas
3D
5D
impulse lines
to regulator
oil
to Ratiotrol
atomizing air
oil
gas
Limiting Orifice Valve
4 PIPE DUAL-FUEL BURNER
Unlike the 3-pipe burner (previous page), this burner has separate connections for gas and atomizing air; so the atomizing air can be left on when burning gas. This gives equal air and heat input capacities with either fuel. It is necessary to make a major adjustment of the gas regulator spring to supply gas corresponding to the atomizing air flow at low fire. See Step 5, page 29. Liquids should enter burners from below; air, gas, pilot, and flame supervisory devices from above, to avoid accidental liquid accumulation in any of these lines, and to prevent dirt and refractory crumbs from plugging small openings or shorting flame rods.
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