D100-68-00
1
I56-1684-007R
DH100ACDCI Ionization
Air Duct Smoke Detector
INSTALLATION AND MAINTENANCE INSTRUCTIONS
3825 Ohio Avenue, St. Charles, Illinois 60174
800/736-7672, FAX: 630-377-6495
www.systemsensor.com
Before Installing
Please thoroughly read the System Sensor
Guide for Proper Use
of Smoke Detectors in Duct Applications
(A05-1004), which
provides detailed information on detector spacing, placement,
zoning, wiring, and special applications. Copies of this manual
are available online at www.systemsensor.com or via System
Sensor’s toll free fax-back service, Documents on Demand at
800/736-7672. NFPA Standards 72 and 90A should also be refer-
enced for detailed information.
NOTICE:
This manual shall be left with the owner/user of
this equipment.
IMPORTANT:
This detector must be tested and maintained reg-
ularly following NFPA 72 requirements. The detector should be
cleaned at least once a year.
Table of Contents
Page
[1] General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
[2] Limitations of Duct Smoke Detectors . . . . . . . . . . . . . . . . . 1
[3] Contents of the Duct Smoke Detector Kit . . . . . . . . . . . . . . 1
[4] Exploded View of Duct Smoke Detector Components . . . . . 2
[5] Installation Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
[6] Duct Smoke Detector Maintenance and Test Procedures . . . 4
[7] Detector Cleaning Procedures . . . . . . . . . . . . . . . . . . . . . . 5
[8] Board Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
[9] Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
[1] General Description
An HVAC system supplies conditioned air to virtually every area
of a building. Smoke introduced into this air duct system will be
distributed to the entire building. Smoke detectors designed for
use in air duct systems are used to sense the presence of smoke
in the duct.
Model DH100ACDCI Air Duct Smoke Detectors utilizes ioniza-
tion technology for the detection of smoke. This smoke detection
method, when combined with an efficient housing design, sam-
ples air passing through the duct and allows detection of a de-
veloping hazardous condition. When sufficient smoke is sensed,
an alarm signal is initiated and appropriate action can be taken
to shut off fans, blowers, change over air handling systems, etc.
These actions can facilitate the management of toxic smoke and
fire gases throughout the areas served by the duct system.
The DH100ACDCI detector is designed to operate on 24 VDC/VAC,
120 VAC, or 240 VAC. Alarm and supervisory relay contacts are
available for control panel interface (alarm initiation), HVAC con-
trol, and other auxiliary functions. Auxiliary relays are also pro-
vided for fan shut down or signaling of up to 9 other detectors
in the loop for multiple fan shut down. These detectors are not
designed for 2-wire applications.
For testing, the alarm can be enabled by a magnet activated test
switch or by the optional remote test station. The duct smoke
detector latches into alarm state when an alarm occurs. A green
LED flashes to indicate power, a red LED signals local alarm
indication, and optional accessories offer a variety of annuncia-
tion capabilities.
The DH100ACDCI can be reset by a momentary power interrup-
tion, the reset button on the front cover, the control panel, or
remote reset accessory.
The DH100ACDCI incorporates a cover
tamper feature that provides a trouble signal after 7 minutes if
the cover is removed or improperly installed.
Proper installation
of the cover removes the trouble condition.
[2] Limitations Of Duct Smoke Detectors
WARNING
The National Fire Protection Association has established that
DUCT DETECTORS MUST NOT BE USED AS A SUBSTITUTE FOR
OPEN AREA DETECTOR PROTECTION as a means of providing
life safety. Nor are they a substitute for early warning in a build-
ing’s regular fire detection system.
System Sensor supports this position and strongly recom-
mends that the user read NFPA Standards 90A, 72, and 101. The
DH100ACDCI Air Duct Smoke Detectors are listed per UL 268A.
This device will not operate without electrical power. Fire situa-
tions may cause an interruption of power. The system safeguards
should be discussed with your local fire protection specialist.
This device will not sense smoke unless the ventilation system is
operating and the cover is installed.
For this detector to function properly, it MUST be installed accord-
ing to the instructions in this manual. Furthermore, the detector
MUST be protected from the elements and operated within ALL
electrical and environmental specifications listed in this manual.
Failure to comply with these requirements may prevent the detec-
tor from activating when smoke is present in the air duct.
[3] Contents Of The Duct Smoke Detector Kit
1. Complete housing base and cover assembly
2. Two #10 x 1
1
/
4
˝ sheet metal screws for mounting
3. Two sampling tube filters
4. One test magnet
5. Drilling template
6. Two foam gaskets
7. Four #6-self tapping mounting screws for the metal sampling
tube and optional exhaust tube extension
8. One sampling tube end cap
9. One plastic sampling tube
10. One #8 self-tapping screw for the plastic sampling tube
NOTE:
For ducts over 1
1
⁄
2
feet, longer sampling tubes must be
ordered to complete the installation. They must be the correct
length for the width of the duct where they will be installed. See
Table 1 on page 3 to determine the sampling tube required for dif-
ferent duct widths.
I56-1684-00
7R
