Which device is not allowed to initiate Elevator Phase I recall?

Which device is not allowed to initiate Elevator Phase I recall?

• A. Smoke detector
• B. Manual fire alarm box
• C. Hoistway detector
• D. Lobby detector

Answer: (B)

Phase I recall is the automatic process that brings elevators to a safe floor when a fire alarm is triggered, so the fire department can access the building. This recall is typically initiated by automatic detecting devices connected to the fire alarm system or by the fire command function coordinating the elevator control circuits. Smoke detectors in the elevator lobby or machine room, hoistway detectors in the shaft, and lobby detectors are all designed to provide immediate, automatic input to start Phase I recall, ensuring a quick and coordinated response without relying on manual actions. A manual fire alarm box is used to summon the building-wide alarm, but it is not considered a direct initiator of Elevator Phase I recall. The recall action is controlled through the fire alarm control panel and the elevator control circuitry, so manual pull stations trigger the general alarm rather than directly causing the elevator to recall. This separation helps prevent unnecessary recalls from isolated manual activations and keeps recall behavior tightly coordinated with the overall fire response.

Phase I recall is the automatic process that brings elevators to a safe floor when a fire alarm is triggered, so the fire department can access the building. This recall is typically initiated by automatic detecting devices connected to the fire alarm system or by the fire command function coordinating the elevator control circuits. Smoke detectors in the elevator lobby or machine room, hoistway detectors in the shaft, and lobby detectors are all designed to provide immediate, automatic input to start Phase I recall, ensuring a quick and coordinated response without relying on manual actions.

A manual fire alarm box is used to summon the building-wide alarm, but it is not considered a direct initiator of Elevator Phase I recall. The recall action is controlled through the fire alarm control panel and the elevator control circuitry, so manual pull stations trigger the general alarm rather than directly causing the elevator to recall. This separation helps prevent unnecessary recalls from isolated manual activations and keeps recall behavior tightly coordinated with the overall fire response.