INSTALLATION AND MAINTENANCE INSTRUCTIONS
DH100ACDCLP Air Duct Smoke Detector
with Extended Air Speed Range
The Innovair DH100ACDCLP model is a photoelectric
detector approved for an extended air speed range of 100 to
4000 feet per minute (0.5 m/s to 20.3 m/s) and an operational temperature range of 32°F to 131°F (0°C to 55°C).
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
(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 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 annunciation capabilities.
The DH100ACDCLP can be reset by a momentary power
interruption, the reset button on the front cover, the control panel, or remote reset accessory. The DH100ACDCLP
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
3825 Ohio Avenue, St. Charles, Illinois 60174
1-800-SENSOR2, FAX: 630-377-6495
www.systemsensor.com
[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..5
[7] Detector Cleaning Procedures..........................................7
[8] Board Replacement .........................................................8
[9] Specifications ..................................................................8
Warranty ..............................................................................8
[1] General Description
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 DH100ACDCLP Air Duct Smoke Detectors are listed per
UL 268A.
An HVAC system supplies conditioned air to virtually every
area of a building. Smoke introduced into this air duct
system will be distributed throughout the entire building.
Smoke detectors designed for use in air duct systems are
used to sense the presence of smoke in the duct.
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.
Model DH100ACDCLP Air Duct Smoke Detector utilizes
photoelectric technology for the detection of smoke. This
detection method, when combined with an efficient housing design, samples air passing through the duct and allows
This device will not sense smoke unless the ventilation
system is operating and the cover is installed.
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 DH100ACDCLP detector is designed to operate on
24 VDC/VAC, 120 VAC, or 240 VAC. Alarm and supervi-
For this detector to function properly, it MUST be installed
according to the instructions in this manual. Furthermore,
the detector MUST be 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.
sory relay contacts are available for control panel interface
D200-14-00 1 I56-0084-08R
SCREW HOLES FOR
ATTA
CHING HOUSING
TO
DUCT WORK.
[3] Figure 1: Exploded View of Duct Smoke Detector Components
FOAM
GASKETS
METAL
SAMPLING TUBE
SAMPLING TUBE
FILTERS
DETECTOR
COVER
DETECTOR BOARD
CONDUIT HOLES
DETECTOR
HOUSING
TERMINAL STRIP
POWER BOARD
COVER MOUNTING
SCREWS
H0165-00
[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
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:
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 inlet tube required for different
duct widths.
[5] Installation Sequence
[5.1] Verify Duct Air Flow Direction And Velocity
Model DH100ACDCLP detectors are designed to be used in
air handling systems having air velocities of 100 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 (anemometer) 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
[5.3] Secure The Detector Housing To The Duct
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.
Figure 3. Installation of foam gaskets over sampling
tube bushings:
H0110-00
the plastic sampling tube. Secure with the #8 self-tapping
screw into the bottom of the permanent tube (shown in
Fig. 2).
D200-14-00 2 I56-0084-08R
H0107-00
SAMPLING
TUBE
END CAP
AIR HOLES
ARROW
MUST
FACE
INTO AIR FLOW
AIR FLOW DIRECTION
FLANGE
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
[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 2⁄3 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.
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
Figure 5. Tube mounting configurations with varying
air flow direction:
H0108-02
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 2/3 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
NOTE: Only metal sampling tubes may be used on orientations C and D.
H0109-01
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 opposite the duct smoke detector.
2. Slide the tube into the housing bushing that meets the
air flow first. Position the tube so that the arrow points
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.
D200-14-00 3 I56-0084-08R
[5.4.2] Installation For Ducts More Than 8 Feet Wide
NOTE: To install sampling tubes in ducts more than 8
feet wide, work must be performed inside the air
duct. Sampling of air in ducts wider than 8 feet is
accomplished by using the ST-10 sampling tube. 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 and support the end opposite the duct
smoke detector.
Install the sampling tube as follows:
1. Drill a 3/4″ hole in the duct directly opposite the hole
already drilled 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 for moisture drainage.
2. Slide the sampling tube with the flange into the housing
bushing that meets the air flow first. Position the tube so
that the arrow points into the air flow. Secure the tube
flange to the housing bushing with two #6 self-tapping
screws.