Operation | Quick Clean Burner
DIRECT SPARK IGNITION The 4419 series incorporates direct spark ignition, eliminating the need for gas pilots, mixers and other premix pilot support parts. Maintenance of the burner is also reduced with fewer components to adjust and maintain. The igniter and igniter ground leg are easily replaced without special tools. It’s always a good idea to stock a few spare igniters and ground legs. The spark gap should be set to approximately .09 inch (2.3 mm).
RATIO CONTROL and OPERATION The 4419 series burner fuel/air ratio can be controlled with a simple cross connected ratio regulator such as the North Ameri- can 7216 for gas or the 7052 Ratiotrol for fuel oil. Accurate fuel/ air flows can be determined by using 8697 Metering Orifices in the fuel gas and air lines . periods of operation on gas, the atomizer can be partially retracted or completely removed and stored: Use a blanking disk and gasket to seal the burner if the atomizer is removed (see page 8). Use the stop collar on the atomizer assembly to return the atomizer to the correct position when reinstalling the atomizer. DUAL FUEL OPTION and OPERATION The North American 6419 series is the dual fuel version of the Quick Clean burner for firing #2 fuel oil or fuel gas. The fuel gas only 4419 Series Quick Clean burner can be easily converted to a 6419 Series in the field by adding an atomizer and an 1813 Sensitrol™ Oil Valve. When operating with #2 fuel oil, the atomizer should be operat- ed with a constant 20 osi/35"w.c./86 mbar air pressure. During gas operation, use at least 4 osi/7"w.c./17 mbar atomizing air to cool atomizer (full atomizing air may be used); or for extended
Spark ground leg
Igniter
Spark gap
Stablizer
UV sight tube
If furnace temperatures after shutdown rise above 1600 °F, pass air through burner to prevent overheating.
LIGHTING ARRANGEMENTS The burner air should be turned to low fire, and 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 cannot be used with the 4419 Series Burners. When burning #2 fuel oil, the burner should be lit with a small amount of gas first, which is turned off after the oil lights. FLAME SUPERVISION The North American 4419 series has an internally purged flame detector tube that runs from the backplate to the stabilizer. The sight line of the tube is angled to minimize the sensing of flame outside the tile by the UV flame detector. It is recommended that the UV connection be located at the 12 o'clock position for most installations. To optimize the flame signal during low fire oil applications, it may be necessary to have the UV tube sight line point to the "short side" of the angled wall as shown in Figure 1. The connection on the 4419 Series UV flame dectector is a ½" MPT fitting. Refer to Bulletin 8832 for choices of UV flame detectors and adapters.
4419A/6419A UPDATED DESIGN
4419 series burners built after mid 2020 have an updated design and are designated as 4419A/6419A. Several parts have been simplified, but all the input connection dimensions and capacities are the same as the previous design. The updated parts include: — Inner and outer body tubes combined into one assembly — UV swivel mounting plate — 14 mm igniter with single electrode — Replaceable igniter ground rod assembly — Relocated body air pressure tap
Bulletin 4419 Page 3
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