What occurs next in the normal sequence of operation of an electric release mechanism after the solenoid valve opens?

After the solenoid valve opens, the next step in the normal sequence of operation involving an electric release mechanism is that water drains from the priming chamber. The opening of the solenoid valve allows water to flow, which is necessary for proper system function and indicates that the control mechanism is functioning as intended.

In sprinkler systems, the priming chamber must be emptied to allow water to flow into the piping system. This drainage is crucial to prepare the system for activation and helps ensure that there is an efficient delivery of water when the sprinkler system is engaged. Following this drainage, the system can move forward to distribute water effectively to the areas needing protection.

The other choices suggest preliminary or alternative actions that do not directly follow the opening of the solenoid valve. The electric release device activating and the control panel energizing typically occur prior to the valve opening, indicating that the system is preparing to release water. Holding water in the priming chamber would impede the drainage process and is not part of the normal sequence following the opening of the valve. Therefore, the accurate answer is that water drains from the priming chamber after the solenoid valve opens.