What Is Elevator Recall and How Does Fire Service Mode Work?

Elevator recall automatically returns cars to a safe floor on fire alarm activation (Phase I), then gives firefighters manual control of the cars (Phase II). Engineers design the detector locations, the fire alarm-to-elevator interfaces, primary and alternate recall floors, and the keyed firefighter operation — with every interface explicitly assigned. Recall is one of those systems that looks simple on a riser diagram and generates endless field arguments. The design has to be explicit about who does what, because two trades meet at the controller and neither wants the liability.

Phase I is automatic and fast: detection in the protected elevator spaces signals the controller, the cars complete their current run or reverse, travel to the recall floor, open, and go out of service. The lobby detection placement is critical — detectors have to catch smoke before it reaches the hoistway doors, and the machine room needs its own coverage because an equipment fire there is its own emergency. Phase II is manual and deliberate: a firefighter inserts the key, takes control, and operates the car with constant-pressure buttons — the car only moves while the button is held, so a panicked passenger can't send it somewhere. The firefighter can bypass landing calls and go directly to the fire floor or to floors where people need evacuation. The car also needs emergency power: elevators on standby power are sequenced so the generator isn't overloaded, and at least one car has to be available for firefighter use.

Recall is tested at every fire alarm acceptance test, and it fails when the interfaces weren't designed. Here's what I lock down. The recall coordination checklist.

• Detection placed correctly: lobby, machine room, and hoistway coverage per the code and the sequence
• Interface defined in writing: fire alarm side and elevator side meet at a documented point
• Both recall floors designated: primary and alternate, with the selection logic in the sequence of operations
• Firefighter operation verified: Phase II key switches tested on every car designated for fire service
• Power sequenced: elevator emergency power arranged so cars are available when the generator runs