This piping schematic details the hydronic water supply and return connections for an air handling unit coil utilizing a two-way control valve arrangement. The supply and return risers incorporate automatic flow control assemblies per specifications, shut-off valves, pressure and temperature wells, Pete's plugs, flexible connections, and typical automatic air vents. A three-quarter-inch threaded hose drain valve with cap is provided on the return line. The hydronic coil connection maintains a clearance distance of four and a half times the pipe diameter. Notes require providing two-way or three-way control valve arrangements per equipment schedules and installing supply and return piping in the same plane without blocking access doors.
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