Product Overview | 4452 Natural Gas Burner
CONSTRUCTION The burner body is constructed of sturdy cast iron. Mounting plates are steel, and the flame stabilizer is fabricated from stainless steel. The firing tube is 309 stainless steel (other alloys are available upon request). The firing tube and burner internal parts are easy to access and maintain. The standard 4452 burner has NPT pipe threads for all gas connections. Air connections on the 4452-6 burners are threaded, while the 4452-7 and -8 include threaded companion flanges. The metric version features British Parallel pipe threads on all gas connections and on the air connections for the M4452-6 size. Welded companion flanges are supplied with the M4452-7 and -8. LIGHTING ARRANGEMENTS Burner ignition is provided by a direct spark igniter located on the main burner body. The burner should be turned to low fire with the spark turned on before opening the burner gas valve. After the burner is lit, the spark must be turned off for proper burner operation. During the ignition period, a continuous 6000 volt (minimum) spark is required. Spark distributor systems can- not be used reliably with 4452 Burners. CONTROL and ADJUSTMENT The 4452 burner fuel/air ratio can be controlled with a simple cross-connected ratio regulator such as the North American 7216. For firing rate control the burner can use conventional on- ratio turndown, StepFire TM or pulse firing. 4452 burners will not operate reliably with excess fuel. Refer to Sheet 4452-3 for additional instructions and installation requirements. Accurate air/gas ratios can be determined by using 8697 Metering Orifices in the fuel and air lines.
FLAME SUPERVISION UV flame detectors or flame rods can be used with the 4452. A UV scanner applied to this burner will detect the direct igniter's spark. A UV-based flame supervision system must be designed to ignore this detection by use of an appropriate flame relay, or other code-compliant means, to prevent interruption of the ignition sequence. See Bulletin 8832 for choices of flame detectors and adapters or Parts List 4452-1 for applicable flame rod part numbers . UV detector, adapter, and flame rod must
be ordered separately. MOUNTING TO SHELL
The Burner must be attached to the shell of the furnace for support and sealed to avoid air infiltration. If air is allowed to leak between the furnace shell and the mounting flange NOx emissions could increase. The burner is supplied with a "FGR" collector which helps maintain uniform FGR flow into the burner. The FGR collector flange is welded to the furnace shell and the burner mounted to the collector flange with pre-attached studs.
Weld FGR collector flange to furnace shell
6"
30° minimum (60° included)
Flare opening for thick wall or roof sections
(Burner shown separated from collector for clarity.)
Air cooled flame rods are suggested for applications above 1200°F or when the burner will operate at low fire for sustained periods. Low pressure combustion air, upstream of a control valve, is required. Air consumption will be approximately 100 scfh at 16 osi. A minimum of 12 osi is recom- mended.
Bulletin 4452 Page 3
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