Abstract: A pilot assembly for a furnace burner includes a housing having a first port capable of mating with a flame detector which can monitor the pilot or main flame of the furnace burner. The housing further includes an air-fuel mixture inlet port coaxially disposed with respect to a second port, which serves the purpose of mating with a spark ignition means. The axes of the fuel mixture inlet port and second port are substantially perpendicular to the axis of the first port. The second port is adapted such that any portion of the spark ignition means extending through the second port and into the housing will not interfere with the monitoring performed by the flame detector means. The housing further includes a third port which can accommodate means for visually sighting the pilot flame. The third port can also serve the purpose of providing manual ignition of the pilot burner.

Abstract: A refractory burner block having a generally cup shaped depression is adapted for mounting in the furnace wall, with the depression facing the furnace interior. The block is provided with a bore that extends from the cup shaped depression to accommodate a burner nozzle. Resilient means connect the burner block with the cover plate so that both block and cover plate may independently contract and expand, minimizing stress loads on the cup, resulting in less cup cracking and failure.A joint is provided with a step between the furnace wall and the burner block, reducing the possibility of gaps opening up and forming a barrier to radiant heat and to convection flow.A central locating collar relieves the anchor bolts from undue stress in supporting the burner block. A resilient seal is used to seal the block against the central locating collar.Pilot means to light the main burner and plenum means to buffer the pilot from the main burner are provided to reduce pilot "blowout.