System Sensor InnovAir DH100ACDCI Installation And Maintenance Instructions Manual
INSTALLATION AND MAINTENANCE INSTRUCTIONS
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Archived Document
DH100ACDCI Ionization
Air Duct Smoke Detector
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 referenced for detailed information.
NOTICE: This manual shall be left with the owner/user of
this equipment.
IMPORTANT: This detector must be tested and maintained
regularly 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]Exploded View of Duct Smoke Detector Components 2
[4]Contents of the Duct Smoke Detector Kit 2
[5]Installation Sequence 2
[6]
Duct Smoke Detector Maintenance and Test Procedures
[7]Detector Cleaning Procedures 7
[8]Board Replacement 8
[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 ionization technology for the detection of smoke. This smoke
detection method, when combined with an efficient housing design, samples air passing through the duct and allows
detection of a developing 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 control, and other auxiliary functions. Auxiliary relays are also provided for fan shut down
or signaling of up to 9 other detectors in the loop for mul-
5
3825 Ohio Avenue, St. Charles, Illinois 60174
A Division of Pittway
800/736-7672, FAX: 630-377-6495
tiple 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 annunciation capabilities.
The DH100ACDCI can be reset by a momentary power
interruption, the reset button on the front cover, the control
panel, or remote reset accessory. The DH100ACDCI incor-
porates 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
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 building’s regular fire detection system.
System Sensor supports this position and strongly recommends 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
situations 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
according 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 detector from activating
when smoke is present in the air duct.
D100-68-00 1 I56-1684-06R
[3] Figure 1: Exploded View Of Duct Smoke Detector Components
FOAM
GASKETS
PLASTIC
SAMPLING TUBE
CONDUIT HOLES
DETECTO
R
HOUSING
TERMINAL STRIP
DETECTOR
COVER
SAMPLING TUBE
FILTER
S
PLASTIC SAMPLING TUBE
SELF-TAPPING SCRE
W
POWER BOARD
DETECTOR BOARD
COVER MOUNTING
SCREWS
Archived Document
A78-2690-00
[4] Contents Of The Duct Smoke Detector Kit
1. Complete housing base and cover assembly
2. Two #10 x 11/4” 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 11⁄2 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 different duct widths.
[5] Installation Sequence
[5.1] Verify Duct Air Flow Direction And Velocity
Model DH100ACDCI detectors are designed to be used in
air handling systems having air velocities of 500 to 4000
feet per minute. Be sure to check engineering specifications
to ensure that the air velocity in the duct falls within these
parameters. If necessary, use a velocity meter to check the
air velocity in the duct.
[5.2] Drill The Mounting Holes
Remove the paper backing from the mounting template
supplied. Affix the template to the duct at the desired
mounting location. Make sure the template lies flat and
smooth on the duct. Center punch holes A and B. Drill the
holes as indicated on the template.
[5.2.1] Sampling Tube Installation for Ducts Less
Than 11⁄2 Feet Wide (see Figure 2)
1. Remove the front cover.
2. Slide the plastic sampling tube into the housing bushing.
3. Align the holes in the bushing with the holes in the
sampling tube. Make sure there are 6 exposed holes on
the plastic sampling tube. Secure with the #8 self-tapping
screw into the bottom of the permanent tube (shown in
Fig. 1).
NOTE: The sampling tube end cap is critical to the proper
operation of the duct smoke detector. The end cap
is needed to create the proper air flow to the sensor
of the duct smoke detector.
NOTE: For ducts greater than 11⁄2 feet in width, refer to
sections [5.4.1] and [5.4.2].
Figure 2. Plastic sampling tube
connected to duct smoke detector:
[5.3] Secure The Detector Housing To The Duct
H0110-00
Slide the foam gaskets over the tube bushings as shown
in Figure 3. Use the two 11/4” long sheet metal screws to
screw the detector housing to the duct.
CAUTION: Do not overtighten the screws.
D100-68-00 2 I56-1684-06R
Figure 3. Installation of foam gaskets over sampling
AIR FLOW
DIRECTION
DETECTOR
HOUSING
DOTS INDICATE POSITION OF
SAMPLING TUBE HOLES
AIR FLOW
DIRECTION
DETECTOR
HOUSING
SAMPLING
TUBE
EXHAUST
TUBE
AIR FLOW
DIRECTION
EXHAUST
TUBE
SAMPLING
TUBE
SAMPLING
TUBE
EXHAUST
TUBE
DETECTOR
HOUSING
AIR FLOW
DIRECTION
DETECTOR
HOUSING
A.
B.
C.
D.
HORIZONTAL MOUNTING OF HOUSING
VERTICAL MOUNTING OF HOUSING
WARNING
SCREW HOLES FOR
ATTA
CHING HOUSING
TO
DUCT WORK.
SAMPLING
TUBE
END CAP
AIR HOLES
ARROW
MUST
FACE
INTO AIR FLOW
AIR FLOW DIRECTION
FLANGE
Archived Document
tube bushings:
H0107-00
[5.4] Sampling Tube Installation for Ducts Greater
Than 11⁄2 Feet Wide
The sampling tube is identified by a series of air inlet holes
on the tube. A plastic tube is included for ducts up to 18
in width. All other lengths must be purchased separately.
Order the correct length, as specified in Table 1, for width
of the duct where it will be installed. It is recommended
that the sampling tube length extend at least two-thirds
across the duct width for optimal performance. The
exhaust tube is molded onto the base of the duct housing,
and the A2440-00 Exhaust Tube Extension is available as
an accessory in those cases where the molded exhaust port
does not extend at least 2 inches into the duct.
site the duct smoke detector.
2. Slide the tube into the housing bushing that meets the
air flow first. Position the tube so that the arrows point
into the air flow.
3. Secure the tube flange to the housing bushing with two
#6 self-tapping screws.
4. For tubes longer than the width of the air duct, the tube
should extend out of the opposite side of the duct. If
there are more than 2 holes in the section of the tube
extending out of the duct, select a different length using
Table 1. Otherwise, trim the end of the tube protruding
through the duct so that 1” to 2” of the tube extend outside the duct. Plug this end with the end cap and tape
closed any holes in the protruding section of the tube.
Be sure to seal the duct where the tube protrudes.
NOTE: The sampling tube end cap is critical to the proper
operation of the duct smoke detector. The end cap
is needed to create the proper air flow to the sensor
of the duct smoke detector.
Figure 4. Air duct detector sampling tube:
The sampling tube is always installed with the air inlet
holes facing into the air flow. To assist proper installation,
the tube’s mounting flange is marked with an arrow. Make
sure the sampling tube is mounted so that the arrow points
into the air flow (see Figure 4). Figure 5 shows the various
combinations of tube mounting configurations with respect
to air flow. Mounting the detector housing in a vertical orientation is acceptable, provided that the air flows directly
into the sampling tube holes as indicated in Figure 4.
Table 1. Sampling tubes recommended for different
duct widths:
Outside Duct Width Sampling Tube Recommended*
1 to 2 ft. ST-1.5
2 to 4 ft. ST-3
4 to 8 ft. ST-5
8 to 12 ft. ST-10
*Must extend a minimum of two-thirds the duct width.
[5.4.1] Installation For Ducts Greater Than 11⁄2 Feet
But Less Than 8 Feet Wide
1. If the tube is longer than the width of the air duct, drill
a 3⁄4” hole in the duct opposite the hole already cut for
the sampling tube. Make sure the hole is 1” to 2” below
the inlet hole on the opposite side of the duct to allow
moisture drainage away from the detector. If the tube is
shorter than the width of the air duct, install the end cap
into the sampling tube as shown in Figure 4. Sampling
tubes over 3 ft. long must be supported at the end oppo-
D100-68-00 3 I56-1684-06R
H0108-02
Figure 5. Tube mounting configurations with varying
air flow direction:
H0109-01
NOTE: Only metal sampling tubes may be used on orientations C and D.
In no case should more than 2 air inlet holes be cut off the
tube. There must be a minimum of 10 holes in the tube
exposed to the air stream.
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