Are heat detectors permitted to activate the elevator recall function in the described system?

• A. Yes
• B. No
• C. Only in certain areas
• D. Only when used with a smoke detector

Answer: (B)

Elevator recall needs a fire-initiating device that provides fast, reliable detection of a fire condition. Heat detectors respond to temperature rise, which can be slower and less reliable for signaling a developing fire, and they may be affected by ambient heat sources. Because of that, heat detectors are not used as the sole initiator to recall elevators. The recall function is expected to be triggered by devices intended for rapid fire detection, such as smoke detectors (or other listed fire-detection devices designed for recall). So, heat detectors are not permitted to activate the elevator recall function.