Which procedure is essential for ensuring no air is trapped in the plumbing system after installation?

Flushing water through faucets is essential for ensuring that no air is trapped in the plumbing system after installation. This procedure helps to remove any air pockets that may be present in the lines by actively pushing water through the system. When faucets are turned on, water flows and displaces any air, allowing for a more complete filling of the pipes. This is crucial because trapped air can lead to reduced water flow and may affect the operation of faucets and other fixtures.

While testing controls and performing a pressure test are important for system functionality and checking for leaks, they do not specifically address the issue of air being trapped in the lines. Running the system for a set amount of time can help in various ways, but flushing the water specifically targets air removal and ensures that the plumbing system is fully operational.