System Sensor

System Sensor - D4120 - 4-Wire Photoelectric Duct Smoke Detector

Item: SYSD4120
MFG: D4120
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4-Wire Photoelectric Duct Smoke Detector


InnovairFlex™ duct smoke detectors combine an impressive collection of innovations to greatly simplify HVAC system monitoring. One unit can accommodate multiple installation footprints to overcome mounting constraints. Tool-free, plug-in sampling tubes speed and simplify installation. Broad temperature and humidity ranges accommodate exposure to environmental extremes. Easily visible status indications, a readily accessible test feature, and remote test station accessories simplify testing and maintenance. With its unmatched flexibility, InnovairFlex can adjust to fit any application
  • 4-Wire Photoelectric, integrated low-flow technology
  • Air velocity rating from 100 ft/min to 4,000 ft/min (0.5 m/s to 20.32 m/sec)
  • Versatile mounting options: square or rectangular configuration
  • Plug-in sensor and latest sensor technology help prevent false alarms
  • Broad ranges for operating temperature (–4°F to 158°F) and humidity (0% to 95% non-condensing)
  • Patented sampling tube installs from front or back of the detector with no tools required
  • Increased wiring space with an additional ¾-inch 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
  • 24 VAC/DC or 120 VAC
  • Backward compatibility with existing Innovair products, including remote accessories

California residents: see Proposition 65 Warning

Features and Specification

Height 2.5000
Hush Button No
Length 14.3800
EAN 0783863034411
Contact Rating Alarm initiation contacts (SPST) 2.0A @ 30 VDC (resistive)Alarm auxiliary contatcs (DPDT) 10A @30 VDC (resistive)10A @250 VAC (resistive)1/2 HP @240 VAC1/4 HP @120 VACNOTE: Alarm auxiliary contacts shall not be connected to initiating circuits ofcontrol panels. Use the alarm initiation contact for this purpose.Supervisory Contacts (SPDT) 2.0A @ 30 VDC (resistive)2.0A @ 125 VAC (resistive)
Battery Backup No
Brand System Sensor
Connection Type Terminal Block
Cubic Measurement 0.1040
CUL Listed No
Detection Method Photoelectric
Digital Readout No
Dimensional Weight 2.0000
Display No
Display Options None
Locking Pin No
Maximum Voltage 120 VAC/24 VDC
UL Listed Yes
Standards UL, FM, CSFM
Switch Action Dip Switches
Terminal Connection Yes
Test Button Yes
Type Duct Smoke Detector
UL Recognized No
UPC 783863034411
Visual Alert No
Voltage Various
Warranty Offered Yes
Width 5.0000
Wire Gauge Up to 12 AWG
Package Height 4.0000
Batteries Required No
Mounting Side by Side or Top over Bottom
Operating Temperature -4°F to 158°F (-20°C to 70°C)
Operating Temperature Range -4°F to 158°F (-20°C to 70°C)
Package Length 15.5000
Package Weight 3.3000
Package Width 5.2500
Power Source DC
Sensor Type Photoelectric
Approvals UL, ULC, FM, CSFM
Batteries Included No
Weight 3.3000
Audible Alert No
Accuracy Not Provided
Amps 0.21
Application Duct Smoke Detection


picture_as_pdf data sheet

picture_as_pdf installation instructions

picture_as_pdf specification sheet