Bosch D298M, D298S Specsheet
Fire Alarm Systems | D298 Four‑wire Addressable Detector Bases (24 VDC)
D298 Four‑wire Addressable Detector
Bases (24 VDC)
www.boschsecurity.com
u Low‑profile modular design
u Addressable application
The D298M Master Detector Base and the D298S
Detector Base are used with smoke and heat detector
heads to provide early warning fire detection for life
safety and property protection systems. The D298M
and D298S are 24 VDC bases for use in systems
controlled by either:
• a D7412G (or newer) or D9412G (or newer) control
panel with a D8125 POPEX Module and 24 VDC
auxiliary power supply, or
• a D9124 Fire Alarm Control Panel (FACP)
The D298M provides individual addresses on the FACP
data expansion circuit and accepts the D285/D285TH
Photoelectric Smoke Detector Heads, the D286
Ionization Smoke Detector Head, or the D603, D604,
and D605 Heat Detector Heads. It connects to the
D263 Photoelectric Smoke Detector or the D263TH
Photoelectric Smoke Detector with fixed‑temperature
(135°F [57°C]) heat sensor. It also acts as the master
in a slave circuit consisting of up to 19 D287 or D288
Two-wire Detector Bases with D285/D285TH
Photoelectric Smoke Detector Heads, D286 Ionization
Smoke Detector Heads, or D603, D604, or D605 Heat
Detector Heads. The D298M needs a 3 kΩ end‑of‑line
resistor (P/N: F01U008725) to complete the circuit
and provide supervision.
u Data In and Data Out terminals
u Easy head removal for cleaning and servicing
The D298S has a built‑in POPIT to provide individual
addresses on the FACP data expansion circuit and
accepts the D285 Series Photoelectric Smoke
Detector Heads and the D603, D604, and D605 Heat
Detector Heads. When used with the D285 Series
detector heads, the D298S 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.
These detector bases use the PAM‑4 Relay Module to
provide two Form C dry contact auxiliary outputs.
Removing a detector head from an active polling
circuit sends a trouble signal to the control panel, but
does not interrupt the polling circuit.
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
2 | D298 Four‑wire Addressable Detector Bases (24 VDC)
Installation/configuration notes
Compatible Products
The following products are compatible with both the
D298M Master Detector Base and the D298S Detector
Base:
Category Product ID Product Description
Control G Series
Panels D9124 Addressable FACP
Detector D285 Photoelectric smoke detector head
Heads D285TH Photoelectric smoke detector head with
D286 Ionization smoke detector head
D603 Rate‑of‑Rise heat detector
D604 Fixed‑temperature (+135°F [+57°C])
D605 Fixed‑temperature (+190°F [+88°C])
1
Includes the D7412G (and newer) and D9412G (and
1
Addressable Control Panels
fixed‑temperature (+135°F [+57°C])
heat sensor
heat detector
heat detector
newer) control panels
The following products are also compatible with the
D298M Master Detector Base:
Category Product ID Product Description
Detector D287 Two‑wire detector base
Bases D288 Two‑wire detector base
Detectors D263 Photoelectric smoke detector head
D263TH Photoelectric smoke detector head with
fixed‑temperature (+135°F [+57°C])
heat sensor
Mounting
These bases mount 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 D298M and D298S bases accept any solid 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 farthest
base. For specific wiring requirements, see the D278S/
D298S Installation Instructions or the D298M
Installation Instructions.
Parts included
D298M Master Detector Base
Quant. Component
1 D298M detector base
1 EOL resistor (P/N: F01U008725)
1 Adapter plate (P/N: 18851)
1 Hardware pack
1 Literature pack
D298S Detector Base
Quant. Component
1 D298S detector base
1 Adapter plate (P/N: 18851)
1 Hardware pack
1 Literature pack
Technical specifications
Electrical (Auxiliary Supply)
Current (alarm)
D298S: 18 mA maximum
D298S with PAM-4 Relay: 30 mA
D298M1: 36 mA maximum
D298M1 with PAM-4 Relay: 49 mA
Current (standby)
D298S: 2 mA
D298S with PAM-4 Relay: 8.5 mA
D298M1: 13 mA
D298M1 with PAM-4 Relay: 29 mA
Voltage (operating): 18.9 VDC to 28.0 VDC
1
The current ratings are based on D298M with 19 detectors.
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
D298M Master Detector Base
Provides individual addresses on the FACP data
expansion circuit and accepts the D285/D285TH
Photoelectric Smoke Detector Heads, the D286
Ionization Smoke Detector Head, or the D603, D604,
and D605 Heat Detector Heads.
Order number D298M
D298S Detector Base
Used as a stand-alone addressable base
Order number D298S
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