Data Sheet df-51096.pdf - Fire-Lite Alarms

GENERAL
HVAC systems supply conditioned air to virtually every area
of a building. Smoke introduced into an air recirculation
system is distributed to occupied areas of a building. The
System Sensor DH400 Series Duct Detector Housing is
designed to sample air currents passing through a duct,
allowing early detection of a developing fire. When sufficient
smoke is sensed, an alarm signal is initiated at the
fire alarm panel monitoring the detector, and appropriate
action can be taken to shut off fans and blowers, change
over air handling systems, etc. This can prevent the rapid
distribution or isolation of toxic smoke and fire gases
throughout the areas served by the duct system.
The System Sensor DH400 duct detector system is easy
to install and maintain.
NOTE: The System Sensor DH400 Duct Detector Housing
is supplied with either the 1451DH Ionization Sensor
(DH400I) or the 2451 Photoelectric Sensor (DH400P).
FEATURES
12/24 VDC operation.
Accommodates ionization or photoelectric heads.
Simple change-out of detectors heads; twist-in, twist-out.
Powered output for remote LED.
Air velocity rating from 500 to 4,000 feet (152.4 to 1219.2
meters) per minute.
UL 268A listed to two-wire control panels.
Clear polycarbonate cover for convenient visual inspection
of sampling tube filters.
Rugged Noryl® housing (mounting portion).
Remote test station option.
Easy and quick mounting to round or rectangular ducts
from 1' to 12' (0.6 to 3.66 meters) wide.
Three-year limited warranty.
APPLICATIONS
Duct smoke detectors have specific limitations.
Duct detectors are:
NOT a substitute for open area smoke detectors.
NOT a substitute for early warning detection.
NOT a replacement for a building’s regular fire detection
system.
System Sensor duct detector “Applications and Installation
Instructions” should be used for reference, as well as
“Guide for Proper Use of System Smoke Detectors” (I56-
407-000). Call Fire Lite for information.
June 18, 1998
DH400 Series
2-Wire Duct Detector Housings for
Ionization and Photoelectric Sensors
S911
This document is not intended to be used for installation purposes. We try to keep our product
information up-to-date and accurate. We cannot cover all specific applications or anticipate all
requirements. All specifications are subject to change without notice. For more information,
contact Fire•Lite Alarms, One Fire-Lite Place, Northford, Connecticut 06472. Phone: (800) 627-
3473, Toll Free FAX: (877) 699-4105, FAX Back:(888) 388-3299
WEB: www.firelite.com
Section: Conventional Initiating Devices
CS308
MEA
427-91-E 0V3A0.AY
California
State Fire
Marshal
F-575
3240-1209:155
DH400 Series Duct Detector Housing
CONSTRUCTION AND INSTALLATION
The twist-in, twist-out detector and base allow the removal
of detectors easily and quickly for cleaning and maintenance.
In addition, detector heads can be changed to fit
the application without removing the duct housing. The
DH400 comes with built-in exhaust tube. Sampling tubes
are available to fit ducts from 1 to 12 feet (0.6 to 3.66 meters)
wide.
SPECIFICATIONS
DIMENSIONS: Width: 14-1/2" (36.83 cm). Height: 5"
(12.70 cm). Depth (installed): 4" (10.16 cm).
Weight: 4 lbs. (1.814 kg.).
OPERATING RANGES: Temperature: 0°C to 49°C (32°F
to 120°F). Humidity: 10% to 93% relative humidity.
Air duct velocity: 500' (152.4 m) to 4,000' (1219.2 m) per
minute.
Reset time: 0.3 seconds (maximum).
UL listed to 268A.
DF-51096 — Page 1 of 2

ELECTRICAL RATINGS
(includes base and detector)
System voltage: 12/24 VDC.
Maximum ripple voltage: 4 volts peak to peak.
Start-up capacitance: 0.02 µF maximum.
Standby ratings: 8.5 VDC minimum, 35 VDC maximum,
120 µA maximum.
Alarm ratings: 4.2 VDC minimum at 10 mA; 6.6 VDC maximum
at 100 mA; alarm current must be limited to 100 mA
or less by the control panel. If used, the RA400Z remote
lamp operates within the specified alarm currents.
Reset voltage: 2.5 VDC minimum.
Reset time: 0.3 seconds maximum.
INLET TUBE SELECTION
Outside Duct Width Inlet Tube Required*
Up to 2 feet
(0.6096 m)
2 to 4 feet
(0.6096 to 1.2192 m)
4 to 8 feet
(1.2192 to 2.4384 m)
8 to 10 feet
(2.4384 to 3.0480 m)
*NOTE: Inlet tube is required and must be purchased
separately. Order one inlet tube for each duct detector
housing ordered.
Page 2 of 2 — DF-51096
ST-1.5
ST-3
ST-5
ST-10
PRODUCT LINE INFORMATION
Model Description
DH400I Duct detector housing with ionization smoke
detector.
1451DH Replacement ionization smoke detector head.
DH400P Duct detector housing with photoelectric
smoke detector.
2451 Replacement photoelectric smoke detector
head.
ST-1.5 Metal sampling tube, duct widths 1' to 2' (see
table at left for metric lengths).
ST-3 Metal sampling tube, duct widths 2' to 4'.
ST-5 Metal sampling tube, duct widths 4' to 8'.
ST-10 Metal sampling tube, duct widths 8' to 12'.
RA400Z Remote annunciator alarm LED.
M02-04-00 Test magnet.
RTS451 Remote test station. Mounts in single-gang
box. Includes red alarm LED and magnet test
switch (separate 24 VDC/VAC is required).
MOD400R Sensitivity test kit.
CRT-400 Ionization cover removal tool.
The RTS451
The RA400Z