System Sensor DH100ACDCI User Manual

INSTALLATION AND MAINTENANCE INSTRUCTIONS

WARNING

I56-1684-007R

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 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 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 [3] Contents of the Duct Smoke Detector Kit [4] Exploded View of Duct Smoke Detector Components [5] Installation Sequence [6] Duct Smoke Detector Maintenance and Test Procedures [7] Detector Cleaning Procedures [8] Board Replacement [9] Speciﬁcations

Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

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[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.

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3825 Ohio Avenue, St. Charles, Illinois 60174

800/736-7672, FAX: 630-377-6495

www.systemsensor.com

The DH100ACDCI can be reset by a momentary power interruption, the reset button on the front cover, the control panel, or remote reset accessory.

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.

The DH100ACDCI incorporates a cover

[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 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

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 dif ferent duct widths.

/4˝ sheet metal screws for mounting

D100-68-00 1 I56-1684-007R

SCREW HOLES FOR ATTACHING HOUSING TO DUCT WORK.

[4] Figure 1: Exploded View Of Duct Smoke Detector Components

FOAM

GASKETS

PLASTIC

SAMPLING TUBE

CONDUIT HOLES

DETECTOR

HOUSING

TERMINAL STRIP

DETECTOR

COVER

SAMPLING TUBE

FILTERS

PLASTIC SAMPLING TUBE

SELF-TAPPING SCREW

POWER BOARD

DETECTOR BOARD

COVER MOUNTING

SCREWS

[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.

[5.3] Secure The Detector Housing To The Duct

Slide the foam gaskets over the tube bushings as shown in Figure 3. Use the two 1 ing to the duct.

CAUTION: Do not overtighten the screws.

/4˝ long sheet metal screws to screw the detector hous-

Figure 3. Installation of foam gaskets over sampling tube bushings:

H0401-00

[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 sam pling tube. Secure with the #8 self-tapping screw into the bot tom of the permanent tube (shown in

Figure 1).

NOTE: The sampling tube end cap is critical to the proper opera-

tion 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:

D100-68-00 2 I56-1684-007R

H0110-00

[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 cor rect 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 per formance. 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.

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 sam pling 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 indi cated in

Figure 4.

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

HORIZONTAL MOUNTING OF HOUSING

VERTICAL MOUNTING OF HOUSING

WARNING

Table 1. Sampling tubes recommended for different duct widths:

Figure 5. Tube mounting conﬁgurations with varying air ﬂow direction:

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 sam pling 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 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. Oth erwise, 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:

[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 inlet 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 and support the end opposite the duct smoke detector.

D100-68-00 3 I56-1684-007R

Figure 4

H0108-02

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.

Install the inlet tube as follows:

1. Drill a

2. Slide the sampling tube with the ﬂange into the housing bush

3. From inside the duct, couple the other sections of the sam

4. Trim the end of the tube protruding through the duct so that

NOTE: An alternate method to using the ST-10 is to use two ST-5 sampling tubes. Remove the ﬂange from one of the tubes and in stall as described above. After the installation, use electrical tape to close off some of the sampling holes so that there are a total of 10 to 12 holes spaced as evenly as possible across the width of the duct.

NOTE: Air currents inside the duct may cause excessive vibration, especially when the longer sampling tubes are used. In these cases a 3” ﬂoor ﬂange (available at most plumbing supply stores) may be used to fasten the sampling tube to the other side of the duct. When using the ﬂange/connector mounting technique, drill a 1 inch to 1

⁄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.

ing 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.

pling 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.

1 to 2 inches of the tube extend outside the duct. Plug this end with the end cap and tape closed any holes in the pro truding section of the tube. Be sure to seal the duct when the tube protrudes.

⁄4 inch hole where the ﬂange will be used.

H0109-01

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