The LiftMaster LMPD24-2W is a conventional photoelectric smoke detector designed for use on compatible 2‑wire detection circuits operating at 12 or 24 VDC. Using photoelectric sensing to identify visible combustion particles from smoldering fires, it’s a practical choice for commercial and light‑industrial applications where early smoke detection is required to trigger protective actions. Commonly used with LiftMaster fire door release controls (LM21 Series) and other listed releasing devices or conventional fire alarm control panels that support 2‑wire photoelectric detectors, this unit serves well as a replacement part or an upgrade in rolling steel door, warehouse, retail, parking facility, and general commercial environments.
As a 2‑wire model, the LMPD24-2W simplifies wiring by sharing power and signaling on a single pair, but it must be connected only to control equipment specifically listed for use with 2‑wire photoelectric detectors. Follow all code and manufacturer requirements for detector placement, spacing, and wiring, including polarity and the correct end‑of‑line resistor as specified by the panel. Installation and periodic testing should be performed by qualified personnel in accordance with NFPA 72 and local codes. For best results, mount in clean, dry indoor locations and avoid areas prone to excessive dust, steam, or cooking aerosols. This LiftMaster 12/24V two‑wire photoelectric smoke detector provides dependable, conventional detection for compatible fire door release systems and conventional alarm circuits in residential/commercial applications where listed compatibility is met.