Product Overview | 4723 Tube Gas Burners
FEATURES The 4723 Evenglow radiant tube burner is designed to adapt to most radiant tube applications. Fuel is burned by a combination of diffusion flame and adjustable partial premix combustion. A simple, easy-to-access adjustment screw located on the backplate changes the amount of primary air premixed with the fuel, which lengthens or shortens the flame. This adjustment can be made while the burner is firing, without having to disassemble and adjust any of the burner internal parts. Evenglow burners include a built-in V-port fuel adjustment plug, multiple observation ports, a flanged air connection, and a gas connection that can be rotated in 90° increments. Note: For systems using pulse-fired burner control the threaded backplate gas connection is to remain in-line with burner air connection as shown in 4723 burner graphics above. Ignition is provided by a direct spark igniter or a spark-ignited premix pilot. The ignition device is held in place with a rugged yoke that allows easy switching from one lighting method to the other. The burner body and backplate are constructed of sturdy cast iron. The flame retainer is a single piece investment casting made from high temperature alloy for longer life. THE EVENGLOW ADVANTAGE: — The Evenglow burner adapts to your radiant tube application, adjustable heat release capabilities are built in. — The rugged cast alloy flame retainer stages combustion, avoiding hot spots and burnouts. — Unique lighting arrangement provides easy lighting without high maintenance bayonet-style pilots or long expensive electrodes. — Easy access to controls and multiple observation ports are provided on the backplate.
AIR CAPACITY Capacities in Table 1 are with the primary air set to 30%. Burners are shipped with the primary air adjusting screw closed, corresponding to 20% primary air and 87.5% of listed capacities. Wide open adjustment of primary air screw increases primary air to approximately 40% and total air capacity to approximately 117% based on Table 1 figures. Table 2 shows the approximate number of turns of the air adjusting screw for 30% and maximum primary air. Installations using greater than 30% primary air should have blower capacity increased accordingly. Primary air screw may require adjustment for smooth operation on some tube configurations. NOTE: The air adjustment valve should be opened one turn prior to lighting and adjusting a new burner. PREHEATED AIR The hot air model of the 4723 is suitable for air preheats from 400 to 900°F. The premix pilot requires ambient temperature air. These burners do not include a built-in gas adjustment cartridge; a conventional 1807 Limiting Orifice Valve must be used instead. Valves should be piped as close to the burner as possible. To order a burner for hot air specify the gas pipe plug, preheated air adjusting plug, and the high temperature gasket when ordering.
Bulletin 4723 Page 2
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