Piping connections for an HVAC coil serve both the supply and return lines. The supply line features a union, an air vent positioned at the highest point, pressure and temperature test plugs, a calibrated balancing valve, and a strainer. The return line includes an isolation valve, a strainer, a three-quarter inch ball valve equipped with a hose-thread drain connection, pressure and temperature test plugs, and a union. Piping is arranged to maintain required service clearances.
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