The LiftMaster LMPD24-4W is a hardwired, photoelectric smoke detector engineered for integration with 4‑wire releasing and control circuits operating at 12 or 24 volts. Designed to detect smoke from slow‑smoldering fires, it interfaces via a dedicated power pair and an alarm relay pair, making it a dependable choice for commercial life‑safety applications such as rolling steel fire doors and shutter systems using LiftMaster release controls, as well as other compatible 4‑wire alarm or releasing panels. This detector is commonly used as a replacement part or upgrade in existing 4‑wire installations where a photoelectric sensing profile is desired.
Typical use involves wiring the detector’s power leads to a listed control or release device and landing the alarm relay on the panel’s initiating circuit, with end‑of‑line supervision components used where required by the control equipment. Its 12/24V operation supports a wide range of systems encountered in commercial and industrial facilities. For safe and compliant performance, install and locate detectors per the manufacturer’s instructions, NFPA 72, and local codes; use only with listed, compatible equipment; and function‑test at commissioning and during routine maintenance. This LMPD24‑4W photoelectric model serves buyers searching for a LiftMaster smoke detector for 4‑wire circuits, a compatible component for fire door release systems, or a reliable replacement sensor for commercial applications.