During Phase II operation, which button sequence should a firefighter use to ensure the elevator goes to a specific floor?

The correct approach for a firefighter to ensure the elevator goes to a specific floor during Phase II operations is to push and hold the 'Door Close' button followed by the desired floor button. This sequence is essential because Phase II operations allow firefighters to take control of the elevator system during emergencies. In this phase, elevators can be manually operated, and utilizing the combination of pressing 'Door Close' ensures that the doors do not reopen until the requested floor is reached, thereby providing more control over the elevator's function in a potentially high-stress environment.

Simply selecting the floor number does not provide the same level of control and could lead to the door reopening if an external call is received. Pressing the 'Emergency' button might initiate emergency protocols but is not specifically intended for floor selection in this context. The 'Alarm' button primarily serves to notify or signal an emergency situation rather than to control the elevator's operational sequence. Thus, the button sequence that includes holding 'Door Close' reinforces not only the intention of reaching a desired floor but also enhances safety by preventing unwanted door operations during critical fire operations.