The medium pressure gas supply line connects to the HVAC boiler through a series of valves and fittings. An isolation valve and an initial three-inch minimum dirt leg are installed upstream. The line incorporates a pressure reducing valve with a tagged PRV-29-X designation, flanked by typical unions for maintenance when flanges are absent. A Pete's plug is provided for temperature or pressure testing. A flexible appliance connector is included at the boiler inlet for field installation alongside a final three-inch minimum dirt leg.
PETE'S PLUG FLEX/APPLIANCE CONNECTOR WHERE REQUIRED FOR FIELD INSTALLATION DIRT LEG, 3" MIN UNION TYP. (IF NOT FLANGED) ISOLATION VALVE PRESSURE REDUCING VALVE DIRT LEG, 3" MIN HVAC BOILER 1 OR BOILER 2 PRV 29-X MPG
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