Data Sheet

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Fire Alarm Systems | D273 Photoelectric Smoke and Smoke and Heat Detectors

D273 Photoelectric Smoke and Smoke and

Heat Detectors

www.boschsecurity.com

u 12 VDC or 24 VDC input

u Designed for commercial or residential use

u Four-wire application

u Light-emitting diodes (LEDs) indicate the status of

the chamber, power, and alarm

u Removable terminal block to simplify wiring

connections

The D273 Family includes the following detector

models:

Model Description

D273 Four-wire

D273IS

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

and sounder

D273TH Four-wire with 135°F (57°C) heat sensor

D273THC Four-wire with 135°F (57°C) heat sensor and auxiliary

relay

D273THCS

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

relay, and sounder

D273THE Four-wire with 135°F (57°C) heat sensor and EOL

relay

D273THR

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

relay

D273THS

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

D273THES

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

and EOL relay

Sounders produce 85 dB at 10 ft (3 m).

The trouble relay indicates both Dirty Smoke Chamber and/or

Power Loss conditions.

Each of the detector models is UL Listed and works

with commercial fire protective signaling and

household fire warning systems. Each model detects

smoke particles produced during wood, paper, and

fabric combustion.

System overview

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.

Summary of content (4 pages)

PAGE 1
Fire Alarm Systems | D273 Photoelectric Smoke and Smoke and Heat Detectors D273 Photoelectric Smoke and Smoke and Heat Detectors www.boschsecurity.
PAGE 2
| D273 Photoelectric Smoke and Smoke and Heat Detectors When a D132B Reversing Relay Module is used, the LED does not latch on alarm. Functions 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. Parts included Quant.
PAGE 3
| D273 Photoelectric Smoke and Smoke and Heat Detectors D273IS Four‑Wire Smoke Detector with Isolated Heat Sensor and Sounder Four‑wire smoke detector with an isolated 135°F (57°C) heat sensor and a sounder. Order number D273IS D273TH Four‑Wire Smoke/Heat Detector Four‑wire smoke detector with a 135°F (57°C) heat sensor. Order number D273TH D273THC Four‑Wire Smoke/Heat Detector with Auxiliary Relay Four‑wire smoke detector with an isolated 135°F (57°C) heat sensor and an auxiliary relay.
PAGE 4
| D273 Photoelectric Smoke and Smoke and Heat Detectors Represented by: Americas: Bosch Security Systems, Inc. 130 Perinton Parkway Fairport, New York, 14450, USA Phone: +1 800 289 0096 Fax: +1 585 223 9180 security.sales@us.bosch.com www.boschsecurity.us Europe, Middle East, Africa: Bosch Security Systems B.V. P.O. Box 80002 5617 BA Eindhoven, The Netherlands Phone: + 31 40 2577 284 Fax: +31 40 2577 330 emea.securitysystems@bosch.com www.boschsecurity.