During the pressure control test, what action must be taken before noting the pump discharge?

In a pressure control test, engaging the pump is essential because it initiates the flow of water through the system, allowing the operator to measure the pressure accurately at the discharge point. Once the pump is engaged, the system can be pressurized, and the operator can gather the necessary data related to the pump's performance, including discharge pressure.

Before noting the pump discharge, other actions, such as calibrating the water tank, closing the tank valve, or opening the discharge valve, may be part of the testing protocol but do not precede the activation of the pump. Engaging the pump is the first critical step to ensure that water is moving through the system, enabling subsequent measurements and adjustments to be made effectively.