Bosch D278S Specsheet
Fire Alarm Systems | D278S Four‑wire Addressable Detector Base (12 VDC)
D278S Four‑wire Addressable Detector
Base (12 VDC)
www.boschsecurity.com
u Low‑profile modular design
u Addressable application
Use the D278S Four‑wire Addressable Detector Base
with smoke and heat detector heads to provide early
warning fire detection for life safety and property
protection systems. The detector base is a 12 VDC
base for use in systems controlled by a D7412G or
D9412G 12 VDC Control Panels with a D8125 POPEX
Module. The detector base has a built‑in POPIT to
provide individual addresses on the FACP data
expansion circuit.
The detector base accepts the D285/D285TH
Photoelectric Smoke Detector Heads, the D286
Ionization Smoke Detector Head, and the D603, D604,
and D605 Heat Detector Heads. When used with the
D285 detector heads, the detector base indicates
Chamber Check trouble to the control panel through
the POPIT bus. The Chamber Check trouble indication
appears on the keypads as a fire trouble.
u Data In and Data Out terminals
u Easy head removal for cleaning and servicing
Certifications and approvals
Region Certification
USA UL UROX: Smoke - Automatic Fire Detectors
CSFM see our website
NYCMEA
(ANSI/UL 268)
12-92-E, Vol. X
Installation/configuration notes
Compatible Products
The following products are compatible with the D278S
Four‑wire Addressable Detector Base:
Category Product ID Product Description
Control Panels D7412G Addressable control panel
D9412G Addressable control panel
Detector Heads D285 Photoelectric smoke detector head
D285TH Photoelectric smoke detector head
D286 Ionization smoke detector
with fixed-temperature (+135°F
[+57°C]) heat sensor
2 | D278S Four‑wire Addressable Detector Base (12 VDC)
D603 Rate‑of‑Rise heat detector
D604 Fixed‑temperature (+135°F
D605 Fixed‑temperature (+190°F
[+57°C]) heat detector
[+88°C]) heat detector
Mounting
The detector base mounts on a single‑gang switch box
or on standard three‑inch and four‑inch square or
octagonal back boxes. An adapter plate is packaged
with the base.
Wiring
The detector base accepts any wire from 12 AWG to
24 AWG (ISO 4 mm2 to 0.2 mm2). The minimum wire
size depends on the number of bases used and the
distance from the FACP to the furthermost base. For
specific wiring requirements, see the D278S/D298S
Installation Instructions.
Parts included
Quant. Component
1 D278S detector base
1 Adapter plate (P/N: 18851)
1 Hardware pack
1 Literature pack
Technical specifications
Electrical (Auxiliary Supply)
Current (alarm): 40 mA
Current (standby): 2.5 mA
Voltage (operating): 9.6 VDC to 13.9 VDC
Environmental
Temperature (operating): +32°F to +100°F (0°C to +38°C)
Mechanical
Color: Bone white
Dimensions (diameter x D): 6.375 in. x 0.9 in.
(16.2 cm x 2.3 cm)
Ordering information
D278S Four‑wire Addressable Detector Base (12 VDC)
A 12 VDC base with a built‑in POPIT for use in systems
controlled by a D7412G or D9412G 12 VDC Control
Panel with a D8125 POPEX Module
Order number D278S
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