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for Natural and L.P. gases EXTERNAL ORIFICE CHANGE Adams special orifice in the manifold union permits orifice change without disassembling the burner. REDUNDANT GAS VALVE Provides back-up valve for added safety ELECTRONIC PRIMARY CONTROL Meeis the most stnngent flame supervision specifications. Flame proving within four (4) seconds; supervises all Ignition functions including 8 of a second relight capability; senses flame by rectification, providing positive flame monitoring PRESSURE SWITC