Which device, when closed, sends a signal to a controller indicating that a timed override period is to begin?

• A. Timed override initiator
• B. Digital output
• C. Building automation system output
• D. Flow switch

Answer: (A)

Starting a timed override period hinges on a device that closes a contact to send a signal into the controller, telling it to begin counting the override time. The timed override initiator is built for that exact function: its contact closes, the controller receives the input, and the override timer starts. This is different from a digital output, which is a signal from the controller to field devices, not a signal that starts the timer. A building automation system output likewise originates from the controller to other devices rather than initiating the override. A flow switch is a sensor that detects flow and reports it to the controller, not specifically used to start a timed override.