Bosch D273TH Smoke/Heat Detector

Bosch D273TH

Four-wire with 135°F (57°C) heat sensor.

12 VDC or 24 VDC input
They a r e Designed for commercial or residential use.
Four-wire application.
Light-emitting diodes (LEDs) indicate the chamber’s status, power, and alarm.
Removable terminal block to simplify wiring connections.

Each detector model i s UL-listed and works with commercial fire protective signaling and household fire warning systems. Each model detects smoke particles produced, by wood, paper, and
fabric combustion.

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.
Smoke particles reflect light onto the photodiode. 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.

Chamber Calibration Tests
Check the sensitivity and calibration of any of these detectors using a visual check, or a magnet test. Or a voltage measurement test. Refer to the D263/D273
Families Installation Guide for specific instructions to perform these sensitivity tests.

Bosch D273TH

Use smoke detectors for detection circuits that protect people. Use heat detectors for circuits that protect property.

Loop Supervision
For loop supervision, install a Bosch Security Systems D275 Power Supervision Module. And an EOL resistor, the device on the loop.
Mounting
The detector has a mounting plate attached to a standard four-inch back box.
For commercial and industrial installations by NFPA 72, space each detector 30 ft (9.2 m) apart.
Wiring
The terminal block accepts up to 12 AWG (ISO 2.5 mm2) wires. You can remove the terminal block from the detector for easier wiring. The terminal block snaps in and out of the detector.

Datasheet

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