Bosch D273, D273IS, D273TH, D273THCS, D273THE Specsheet
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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
The D273 Family includes the following detector
models:
Model Description
D273 Four-wire
1
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
1
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
2
Four-wire with 135°F (57°C) heat sensor and trouble
relay
D273THS
D273THES
1
Four-wire with 135°F (57°C) heat sensor and sounder
1
Four-wire with 135°F (57°C) heat sensor, sounder,
and EOL relay
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
1
Sounders produce 85 dB at 10 ft (3 m).
2
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.
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.
Certifications and approvals
Region Certification
USA UL UROX: Smoke - Automatic Fire Detectors
CSFM see our website
NYCMEA
MSFM
Hong Kong HKFSD J-005/C/023
(UL268 and A), UROX7: Smoke - Automatic Fire Detectors Certified for Canada (cULus)
274-93-E, Vol. VII
Installation/configuration notes
Use smoke detectors for detection circuits that
protect people. Use heat detectors for circuits that
protect property.
Compatible Products
The following products are compatible with the D273
Family detectors:
Category Product ID Product Description
Control
Panels
Modules D132B Reversing relay module
These detector models are compatible with UL Listed
four-wire control panels. Refer to the manufacturer’s
installation instructions to select the correct EOL resistor.
Loop Supervision
For loop supervision, install a Bosch Security Systems
D275 Power Supervision Module and an EOL resistor
after the last device on the loop.
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.
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.
Parts included
Quant. Component
1 Detector
1 Literature pack – Installation Manual, Technical Service
Note on installation
Technical specifications
Environmental Considerations
Relative Humidity: Up to 93%, non-condensing
Operating and Storage
Temperature:
Radio Frequency
Interference (RFI)
Immunity
+32°F to +120°F (0°C to +40°C)
No alarm or setup on critical frequencies
in the range of 26 MHz to 950 MHz.
Mechanical Properties
Dimensions (Diameter x H): 5 in. x 2 in. (12.7 cm x 5.1 cm)
Material: High impact, fire retardant ABS
plastic
Power Requirements
Power-up Time: 22 sec maximum
RMS Ripple: 25% of DC input maximum
Voltage (stand-by): 10 VDC to 30 VDC
Current Draw (alarm) at 30 VDC
D273, D273TH: 18 mA maximum
D273THC: 33 mA maximum
D273THE, D273THR: 36 mA maximum
D273THS: 78 mA maximum
D273THCS: 90 mA maximum
D273THES: 96 mA maximum
D273IS: 100 mA maximum
Current Draw (standby)
D273, D273TH, D27THC,
D273THCS, D273THS:
D273IS: 15 mA
D273THE, D273THES: 15 mA
D273THR: 18 mA maximum
0.1 mA maximum
Ordering information
D273 Four‑Wire Smoke Detector
Four‑wire smoke detector.
Order number D273
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