The InnovairFlex D4120 4-wire photoelectric duct smoke detector features a pivoting housing that fits both square and rectangular footprints and mounts to round or rectangular ductwork. This unit senses smoke in the most challenging conditions, operating in airflow speeds of 100 - 4000 fpm, temperatures of -4 to 158 deg F and a humidity range of 0 to 95% (non-condensing). A plug-in sensor head offers improved false alarm immunity and simple installation, testing and maintenance. An improved cover design isolates the sensor head from the low-flow feature for simple maintenance. The InnovairFlex housing provides ample wiring space, a 3/4 in conduit knockout and built-in short circuit protection to prevent damage to sensitive components during installation. High contrast terminal designations make wiring easy. With its 2:1 sensor-to-power capability, the power board of the D4120 may be used to monitor a second sensor, D4S, simultaneously (i.e., supply and return side). As many as 50 InnovairFlex detectors can be interconnected. When one unit senses smoke, all interconnected detectors will switch their relays; only the detector sensing smoke will go into alarm, thus pinpointing the fire source. An easy-access test/reset button makes it possible to test the unit with the cover on. Three DIP switches can be used to configure field selectable settings: cover tamper delay, number of sensors to be controlled and shut down on trouble option. Each power board has 2 LEDs that can be used to indicate the status of connected sensors and a quick reference imprinted on the cover explains the LED status indications (standby, maintenance, trouble and alarm). The InnovairFlex duct smoke detector can be customized to meet local codes and specifications without additional wiring. The new InnovairFlex product line is compatible with all previous Innovair models, including remote test accessories.

System Sensor® InnovairFlex Duct Smoke Detector, 20 to 29 VDC, 120/24 VAC, 0-95% RH Humidity, 100 to 4000 fpm Air Duct Velocity, 65 mA at 24 VDC, 135 mA RMS at 24 VAC 60 Hz, 35 mA RMS at 120 VAC 60 Hz Alarm Current, 2 A at 30 V DC Resistive (SPST), 10 A at 30 V DC Resistive, 10 A at 250 V AC Resistive, 1/2 hp at 240 V AC, 1/4 hp at 120 V AC (DPDT) Contact, 270 uF, 21 mA at 24 VDC, 65 mA RMS at 24 VAC 60 Hz, 20 mA RMS at 120 VAC 60 Hz Maximum Standby Current, 3 VDC Minimum at 20 to 29 VDC, 2 VAC Minimum at 24 VAC, 10 VAC Minimum at 120 VAC Reset Voltage, 0.6 s Maximum Reset Time, 15 s Response, -4 to 158 deg F Operating, -22 to 158 deg F Storage, 5 in Width, 14-3/8 in Height, 2-1/2 in D

• Four-wire photoelectric, integrated low-flow technology
• Versatile mounting options: square or rectangular configuration
• Plug-in sensor offers superb false alarm immunity and the latest sensor technology
• Increased wiring space with a newly added 3/4 in conduit knockout
• One-easy-access test/reset button and improved LED status
• Patented interconnect feature for multi-fan shutdown
• New high contrast terminal designations
• Built-in short circuit protection from operator wiring errors
• Field selectable settings for configuring the detector
• Two-DPDT form-C relay contacts
• Backward compatibility with existing invar products including remote accessories
• Patented sampling tube installs from front or back of the detector with no tools required