Bosch FAD-325-DH Specsheet

Fire Alarm Systems | FAD-325-DH Analog Duct Smoke Detector Replacement Head

FAD-325-DH Analog Duct Smoke Detector
Replacement Head

www.boschsecurity.com

u Smoke density range of 0.88 %/ft to 2.75 %/ft

(2.9%/m to 9%/m)

The FAD‑325 ‑DH Analog Duct Smoke Detector
Replacement is a replacement detector for the
FAD‑325 Duct Smoke Detector Housing. It detects
smoke particles which typically result from wood,
paper, and fabric combustion. Use it in heating,
ventilation, and air conditioning (HVAC) systems.
It uses a LED and photodiode to measure particulate
levels in its detection chamber. These measurements
are transmitted via the DCP protocol to the fire panel.

Functions

Fire Panel Connections

The detector is controlled by a microprocessor and
communicates with the fire panel (both power and
data) over a two‑wire polling circuit.

Sensitivity levels

The system allows for adjusting sensitivity levels by
the detector over a range of 0.88 %/ft to 2.75 %/ft
(2.9%/m to 9%/m) obscuration. The unique detection
chamber design prevents external light from affecting
the photodiode.

u Adjustable threshold smoke level (determined by

panel)

u Provides automatic compensation values in case of

detector contamination

u Replacement detector for FAD‑325 Analog Duct

Smoke Detector Housing

u Easy detector removal for cleaning and servicing

Status Display

The detector has two LEDs that flash every time the
device is polled and can be switched on steady when
the module goes into active condition.

Certifications and approvals

Region Certification

USA UL UROX: Smoke-automatic Fire Detectors

CSFM see our website

(ANSI/UL 268)

Installation/configuration notes

Compatible Products

The following products are compatible with the
FAD‑325‑DH Photoelectric Smoke Detector
Replacement:

Category Product ID Product Description

Fire Panels FPA‑1000

Family

Analog Addressable Fire
Panels

2 | FAD-325-DH Analog Duct Smoke Detector Replacement Head

Detector Bases FAD‑325 Analog Duct Smoke Detector

Programming
Products

D5070 Analog Device Programmer

Housing

Mounting

The FAD‑325‑DH installs quickly and easily into the
FAD‑325 Analog Duct Housing to replace the detector.
The FAD‑325‑DH attaches to the FAD‑325 Analog Duct
Smoke Detector Housing by inserting the detector into
a groove on the base and turning the detector
clockwise.

Parts included

Quant. Component

1 FAD‑325‑DH Analog Duct Smoke Detector Replacement

1 Dust cover

1 Literature pack

Technical specifications

Electrical

Operating Voltage 17 VDC to 41 VDC range

Current Consumption Depends on housing

Mechanics

Dimensions (Ø x D) 4 in. x 1.5 in. (10.2 cm x 3.8 cm))

Weight 3.2 oz ()

Duct Air Velocity: 300 ft/min to 4000 ft/min

Color Ivory

Material ABS Blend

(1.5 m/s to 20.4 m/s)

Environmental Conditions

Relative Humidity Up to 85 %, non‑condensing

Operating Temperature +32°F to +120°F (0°C to +49°C)

Sensitivity Range 0.88 %/ft to 2.75 %/ft (2.9%/m to

9%/m) obscuration (nine threshold
levels are selectable)

Ordering information

FAD-325-DH Analog Duct Smoke Detector Replacement
Head

Two‑wire replacement detector for the FAD‑325 and
FAD‑325‑R duct housings has adjustable threshold
smoke level and automatic compensation values. It has
EEPROM addressing with the D5070, two polling and
detector status LEDs for 360º view, and easy removal
for cleaning and servicing.

Order number FAD-325-DH