The System Sensor D4120W is a high-performance 4-wire photoelectric duct smoke detector specifically engineered for harsh environments and outdoor rooftop HVAC installations. This air duct smoke detector features a NEMA 4 watertight enclosure, providing superior protection against windblown dust, rain, and splashing water. Utilizing integrated low-flow technology, the unit operates efficiently in airflow speeds ranging from 100 to 4,000 feet per minute, making it a reliable solution for diverse HVAC duct smoke detection requirements. Designed for versatile field application, the D4120W duct detector includes a pivoting housing that adjusts to both square and rectangular footprints, ensuring a tight seal on various duct geometries. It supports a flexible 24Vac/dc or 120Vac power supply and comes equipped with two DPDT relay contacts for fan shutdown and auxiliary control. The plug-in sensor head maximizes false alarm immunity and simplifies maintenance, while the patented sampling tube design allows for tool-free installation from the front or rear of the detector, streamlining setup for the technician on-site. Key Benefits NEMA 4 Watertight Enclosure: UL listed for non-hazardous indoor and outdoor applications, providing critical protection for rooftop units. Wide Velocity Range: Reliable smoke sensing in airflow environments from 100 to 4,000 FPM. Flexible Power Compatibility: Supports dual-voltage inputs (24V AC/DC or 120V AC) for seamless integration with existing fire alarm and BAS systems. Pivoting Housing: Easily adapts to fit both square and rectangular duct configurations. Technician-Friendly Design: Features an easy-access Test/Reset button and high-contrast terminal designations for rapid wiring. Common Questions Is the sampling tube included with the D4120W? No, the sampling tube must be ordered separately to match the specific width of your ductwork. Can the D4120W be interconnected for multiple fan shutdown? Yes, this detector features a patented interconnect capability that allows up to 50 units to be linked for coordinated multi-fan shutdown operations. Where should the conduit holes be positioned during installation? To maintain the watertight seal, it is recommended to mount the detector with the conduit holes facing downwards. This item is not eligible for free shipping. Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
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