System Sensor 4WT-B 4-wire Standard i3 Detector with Fixed 135° Thermal Sensor
The i³™ Series photoelectric and photoelectric/ thermal smoke detectors represent a significant advancement in conventional detection, incorporating three key features: installation ease, intelligence, and instant inspection.
Features
- Plug-in detector line — mounting base included.
- Large wire-entry port.
- In-line terminals with SEMS screws.
- Mounts to octagonal and single-gang backboxes, 4" (101.6 mm) square backboxes, or directly to ceiling.
- Removable detector cover and chamber for easy cleaning.
Electrical Specifications
- Operating Voltage Nominal 12/24 V non-polarized
- Minimum 8.5 V
- Maximum 35 V
- Maximum Ripple Voltage 30% peak to peak of applied voltage
- Standby Current 2-wire 50 μA maximum average; 4-wire: 50 μA maximum average
- Maximum Alarm Current 2-wire 130 mA limited by control panel; 4-wire: 20 mA @12 V, 23 mA
Physical Specifications
- Dimensions (including base) 5.3 inches (127 mm) diameter; 2.0 inches (51 mm) height
- Weight 6.3 oz (178 g)
- Operating Temperature Range 2W-B and 4W-B: 32°F to 120°F (0°C to 49°C); 2WT-B and 4WT-B: 32°F to 100°F (0°C to 37.8°C)
- Operating Humidity Range 0 to 95% RH non-condensing
- Thermal Sensor 135°F (57.2°C) fixed
- Freeze Trouble 2WT-B and 4WT-B only: 41°F (5°C)
- Sensitivity 2.5%/ft nominal
- Input Terminals 14 to 22 AWG
- Mounting 3-1/2" octagonal back box
4-inch octagonal back box
Single-gang back box
4-inch square back box with a plaster ring
Direct mount to ceiling
Agency Listings and Approvals
- UL/ULC
- FM Approved
- CSFM
- FDNY
