5-inch upflow and sideflow furnace cabinets

fatigued diaphragm switches

always use the 350F rollout switch specified by the manufacturer

While the 221526 is factory-calibrated for Natural Gas

you know that intermittent ignition failures are usually traced back to a failing control module

Johnson Controls V43BS-3 Regulating Valve 322055-301 5-inch upflow and sideflow furnaceThe Johnson Controls V43BS 3 is a 2 inch, heavy duty pressure actuated water regulating valve engineered for precision head pressure control in water cooled condensers. Constructed with a red brass body to withstand high stress environments, this valve is NAVSEA certified, making it the industry standard for naval and marine applications where MIL spec compliance is mandatory. This model features a four hole ASME flanged connection and operates within