System Sensor DH100ACDCLWP User Manual
D200-24-00 1 I56-0056-07R
DH100ACDCLWP Watertight Air Duct Smoke
Detector with Extended Air Speed Range
INSTALLATION AND MAINTENANCE INSTRUCTIONS
3825 Ohio Avenue, St. Charles, Illinois 60174
800/736-7672, FAX: 630-377-6495
www.systemsensor.com
The Innovair DH100ACDCLWP is a photoelectric extended air
speed range duct smoke detector with a NEMA 4 Rated
watertight housing. This detector is specially designed for
use in either indoor or outdoor applications to provide a
degree of protection against falling dirt, rain, sleet, windblown dust, splashing water and hose-directed water.
The DH100ACDCLWP is listed for an extended air speed
range of 100 to 4000 feet per minute (0.5 m/s to 20.2 m/s).
IMPORTANT NOTES
The following temperature limitations must be observed
during the installation and handling of this product:
Operating temperature: +32° to +131°F (0° to + 55°C)
Storage temperature: –22° to +158°F (–30° to +70°C)
To maintain the watertight properties of this duct smoke
detector, watertight conduit and fittings must be used.
Mount the product with the conduit holes facing downwards, if possible.
Before Installing
Please thoroughly read the System Sensor Guide for Proper Use
of Smoke Detectors in Duct Applications, 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 regularly following NFPA 90 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
5
[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 DH100ACDCLWP Air Duct Smoke Detector is supplied as a photoelectronic model. This smoke detection
method is combined with an efficient housing design that
samples air passing through a 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 DH100ACDCLWP 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 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. Prior to cover installation, the green LED should be
flashing, indicating that the detector is powered and functioning. To accurately determine detector status following
installation, System Sensor offers a variety of remote
annunciation and test accessories.
The DH100ACDCLWP can be reset by a momentary power
interruption, the reset button on the front cover, the control
panel, or remote reset accessory. The DH100ACDCLWP
incorporates a cover tamper feature that provides a trouble signal after 7 minutes if the cover is removed or
improperly installed. Proper reinstallation 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
DH100ACDCLWP 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.
WARNING
WARNING
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 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.
[4] Contents Of The Duct Smoke Detector Kit
1. Complete housing base and cover assembly
2. Two #10×11⁄4″ 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 telescoping 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 DH100ACDCLWP 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 to check the
air velocity in the duct.
WARNING
WARNING
[5.2] Select Mounting Orientation
If possible, mount the DH100ACDCLWP with the wiring
entry hole(s) facing downwards, so that all wiring enters
the housing from below. This minimizes the possibility of
water entering around the conduit fittings. Mounting the
product with the wiring entry holes on the uppermost surface should be avoided.
[5.3] 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.
[5.4] Secure The Detector Housing To The Duct
Slide the foam gaskets over the tube bushings as shown in
Figure 2. Use the two 11⁄4″ long sheet metal screws to screw
the detector housing to the duct.
CAUTION: Do not overtighten the screws.
Figure 2. Installation of foam gaskets over sampling
tube bushings:
[5.5] Sampling Tube Installation
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 tubes must be ordered separately and
resized for the duct width, as specified in Table 1. It is recommended that the sampling tube length extend at least 2⁄3
across the duct width for optimal performance. The
D200-24-00 2 I56-0056-07R
[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
SCREW HOLES FOR
ATTACHING HOUSING
TO DUCT WORK.
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.
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 3). Figure 4 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 3.
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 2/3the duct width.
[5.5.1] Installation For Ducts Greater Than 11/2Feet
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 short-
er 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.
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 3. Air duct detector sampling tube:
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.
[5.5.2] 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 inlet tube as follows:
1. Drill a 3/4-inch hole in the duct directly opposite the hole
already drilled for the inlet 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.
3. From inside the duct, couple the other sections of the
sampling tube to the section already installed using the
1
/2-inch conduit fittings supplied. Make sure that the
holes on both of the air inlet tubes are lined up and facing into the air flow.
4. 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
when the tube protrudes.
SAMPLING
TUBE
END CAP
AIR HOLES
ARROW
MUST FACE
INTO AIR FLOW
AIR FLOW DIRECTION
FLANGE
D200-24-00 3 I56-0056-07R
DOTS INDICATE POSITION OF
SAMPLING TUBE HOLES
AIR FLOW
DIRECTION
DETECTOR
HOUSING
AIR FLOW
DIRECTION
DETECTOR
HOUSING
AIR FLOW
DIRECTION
DETECTOR
HOUSING
A.
SAMPLING
EXHAUST
TUBE
TUBE
HORIZONTAL MOUNTING OF HOUSING
C.
VERTICAL MOUNTING OF HOUSING
EXHAUST
TUBE
SAMPLING
TUBE
EXHAUST
TUBE
SAMPLING
TUBE
B.
DETECTOR
HOUSING
AIR FLOW
DIRECTION
D.
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