Honeywell VR8540A 4079 Multifunction Combination Gas Control

The Honeywell VR8540A4079 is a multifunction combination gas control valve with Direct Spark Ignition (DSI), designed for reliable gas pressure regulation and burner control in HVAC and heating systems. Operating on 24 V (50/60 Hz) with a magnetic control, this valve supports a wide temperature range from -40°F to +175°F. It features 3/4″ NPT inlet and outlet connections and a two-stage regulator with a non-adjustable first stage at 5.5″ WC and an adjustable second stage range of 8–12″ WC (nominal 10.5″ WC). Built for durability and precision, the VR8540A4079 is ideal for residential and commercial applications requiring dependable gas flow management.