D273TH BOSCH
D273TH BOSCH
D273TH 4-WIRE PHOTO/HEAT DETECTOR.
D273TH Four‑Wire Smoke/Heat Detector Four‑wire smoke detector with a 135°F (57°C) heat sensor.
These detector models use an infrared (IR) LED light source and a silicon photodiode to measure light in a chamber. A fine screen covers the chamber to deter insects and reduce dust accumulation and nuisance alarms.
During a fire, smoke particles reflect light onto the photodiode. When the photodiode measurements exceed the alarm threshold, the detector signals an alarm condition. After the alarm condition clears, interrupt power at the control panel to reset the detector.
D273TH Chamber Calibration Tests
Check the sensitivity and calibration of any of these detectors using a visual check, a magnet test, or a voltage measurement test. Refer to the D263/D273 Families Installation Guide for specific instructions to perform these sensitivity tests.
D273TH Mounting
The detector has a mounting plate that attaches to a standard four-inch back box. For commercial and industrial installations in accordance with NFPA 72, space each detector 30 ft (9.2 m) apart.
D273TH Wiring
The terminal block accepts up to 12 AWG (ISO 2.5 mm2 ) wire. You can remove the terminal block from the detector for easier wiring. The terminal block snaps in and out of the detector.
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