Fire-Lite SD365-IV Intelligent, Addressable Photoelectric Smoke Sensor

The Fire-Lite SD365-IV is an ivory intelligent addressable photoelectric smoke detector supporting both LiteSpeed and CLIP communication protocols, 15-32 VDC operation, and programmable smoke sensitivity from 0.5% to 4.0% obscuration per foot. Designed for compatible Fire-Lite addressable fire alarm control panels, it features rotary decimal addressing, dual multicolor status LEDs, magnetic functional testing, and a removable smoke sensing chamber cover. Its low-profile housing supports compatible 4-inch and 6-inch mounting bases, while UL 268 listing and dual-protocol compatibility make it suitable for new installations and compatible SD355 Series replacement applications.

Fire-Lite SD365-IV Ivory Addressable Photoelectric Smoke Detector with LiteSpeed and CLIP

The Fire-Lite SD365-IV is an intelligent addressable photoelectric smoke detector with an ivory housing and dual LiteSpeed/CLIP communication compatibility, designed for commercial and institutional fire alarm systems. Manufactured by Fire-Lite Alarms, a Honeywell brand, the SD365-IV incorporates an enhanced optical smoke sensing chamber that detects airborne smoke particles and communicates smoke density information to a compatible Fire-Lite fire alarm control panel. The detector operates over a two-wire signaling line circuit (SLC), allowing each installed device to report its individual address, operating status, and alarm condition. Its rotary decimal address switches support up to 159 device addresses, subject to the connected control panel's capacity and communication protocol. Designed as a replacement for compatible earlier SD355 Series detectors, the SD365-IV supports fire alarm installations in offices, schools, hospitals, hotels, warehouses, retail buildings, and other facilities requiring individually identifiable smoke detection.

The SD365-IV features microprocessor-controlled photoelectric smoke sensing with a factory-preset nominal alarm threshold of 1.5% obscuration per foot. Compatible Fire-Lite control panels support a UL application sensitivity range of 0.5% to 4.0% obscuration per foot, allowing alarm thresholds and sensitivity monitoring to be managed according to the system's programming capabilities. The enhanced sensing chamber is engineered to respond to smoke from a broad range of combustion sources while supporting stable addressable communication. The detector incorporates two panel-controlled LEDs providing visible status indication from multiple viewing directions. Depending on the control panel, the indicators can display red, green, or amber and may be configured to blink, remain illuminated, or turn off. The SD365-IV also supports electronic remote testing from compatible panels and includes a magnet-activated functional test switch for local testing without removing the sensing head. A removable cover and insect-resistant chamber screen simplify inspection and cleaning during scheduled fire alarm maintenance.

The Fire-Lite SD365-IV operates from a 15-32 VDC addressable signaling line circuit, with a maximum average standby current of 200 microamps at 24 VDC when communicating every five seconds with the LED enabled. The detector draws a maximum of 2 mA in its specified alarm indication condition and 4.5 mA at maximum LED operating current, supporting low-current operation on compatible addressable detection loops. Its dual-protocol electronics support Fire-Lite LiteSpeed and Classic Loop Interface Protocol (CLIP), providing compatibility with newer LiteSpeed-capable panels and selected legacy CLIP-based fire alarm systems. Manufacturer compatibility documentation identifies supported control panels including the ES-50X, ES-200X, ES-1000X, MS-9050UD, MS-9200 Series, and MS-9600 Series, subject to the exact panel model and approved configuration. The SD365-IV is specifically distinguished from the standard white SD365, which supports LiteSpeed only. The detector is designed for operating temperatures from 32 F to 122 F (0 C to 50 C), with relative humidity from 10% to 93%, non-condensing, and a listed air velocity range of 0-4,000 feet per minute.

The SD365-IV incorporates a low-profile, fire-resistant plastic detector housing with plug-in mounting construction, allowing field wiring to remain connected to the base when the sensing head is removed for maintenance or replacement. The detector measures approximately 2 inches high when installed in a compatible B300-6 base, with an assembled diameter of approximately 6.2 inches using the B300-6 base or 4.1 inches using the B501 base. The detector head weighs approximately 3.4 ounces (95 grams). Compatible mounting options include standard flanged bases, compact bases, and selected relay, isolator, and sounder bases approved for the connected fire alarm control panel. The detachable base design supports mounting to appropriately sized electrical boxes, while the built-in tamper-resistant mechanism helps prevent unauthorized removal when enabled. An optional RA100Z remote LED annunciator can provide detector status indication at a separate location. Fire-Lite recommends typical detector spacing of 30 feet on smooth ceilings in low-airflow applications, subject to NFPA 72, ceiling geometry, airflow, and the authority having jurisdiction.

The Fire-Lite SD365-IV is designed for intelligent addressable smoke detection in Fire-Lite systems requiring LiteSpeed or legacy CLIP communication. The SD365 Series is UL 268 listed for smoke detection applications, with manufacturer documentation identifying UL/ULC listing file S1059, FM approval, and California State Fire Marshal recognition. The detector also supports compatible duct detection applications when installed in an approved housing or arrangement according to the manufacturer's instructions. Unlike the SD365T-IV, which includes a 135 F fixed-temperature heat sensor, the standard SD365-IV provides photoelectric smoke detection only. The SD365R-IV is the separately designated remote-test-capable version intended for compatible duct detector housings. The SD365-IV does not contain an integrated audible sounder, carbon monoxide sensor, or standalone alarm power supply; these functions require separately specified compatible equipment. Combining dual-protocol addressable communication, enhanced optical smoke sensing, programmable sensitivity, low standby current, and simplified maintenance, the Fire-Lite SD365-IV provides a smoke detection solution for compatible new fire alarm installations and legacy Fire-Lite system upgrades.