Mechanical · M-QEXB8

AHU Coil Connection Detail

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The air handling unit coil piping arrangement features supply and return lines equipped with balancing valves, control valves, and isolation valves. A balancing valve is positioned a minimum of five pipe diameters from bends or restrictions and ten pipe diameters from pumps, verified per valve installation, operation, and maintenance instructions. A two-way or three-way control valve is included as specified on the plans, along with typical half-inch test ports and a digital thermometer on each line. Half-inch air vents with ball valves and caps are installed at high points in the system, while three-quarter-inch drain ball valves with hose end connections and caps are provided at low points. Shutoff valves utilize sweat ball valves for two-inch and smaller piping or grooved butterfly valves for two-and-a-half-inch and larger piping, with reducers included as necessary. Clearances must accommodate coil pull, access doors, and filter maintenance.

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