System Sensor : 4-Wire Photoelectric Low-Flow Duct Smoke Detector, 24VDC/120VAC – D4120A

System Sensor Model D4120A — Specifications

• Model No.: D4120A
• Type: 4-Wire Photoelectric Low-Flow Duct Smoke Detector
• Sensor: Photoelectric, with plug-in sensor head for improved false-alarm immunity
• Air Velocity Rating: 100 ft/min to 4,000 ft/min (0.5 m/s to 20.32 m/s)
• Operating Temperature Range: –4 °F to 158 °F (–20 °C to 70 °C)
• Operating Humidity Range: 0% to 95% RH (non-condensing)
• Mounting Configuration: Flexible; supports square or rectangular duct footprints
• Sampling Tube Installation: Front or back installation—no tools required
• Enclosure Features:
• Increased wiring space and ¾″ conduit knockout
• High-contrast terminal labels for easy wiring
• Pivoting housing for flexible mounting
• Testing: Easy-access Test/Reset button that works with cover in place; supports remote testing (RTS151KEY or RTS2-AOS)
• Indications: Dual LED status indicators (Standby, Maintenance, Trouble, Alarm)
• Interconnectivity: Up to 50 units can be interconnected; only the alarmed unit activates, isolating the source of smoke
• Wiring Protection: Built-in short-circuit protection from operator wiring errors
• Field Configuration: DIP-switch settings for cover tamper, number of sensors, and trouble shutdown
• Relay Contacts: Two DPDT Form-C relays, rated for AC/DC control use
• Power Input: 24 VAC/DC or 120 VAC
• Backward Compatibility: Compatible with existing Innovair accessories and products