System Sensor I56-1148-04, D100-67-00 User Manual

INSTALLATION AND MAINTENANCE INSTRUCTIONS

DH100 Air Duct Smoke Detector

A Division of Pittway

3825 Ohio Avenue, St. Charles, Illinois 60174

1-800-SENSOR2, FAX: 630-377-6495

Before Installing

Please thoroughly read the System Sensor Guide for Proper Use of Smoke Detectors in Duct Applications (I56-473),

which provides detailed information on detector spacing, placement, zoning, wiring, and special applications. Copies of this manual are available from System Sensor. NFPA Standards 72 and 90A should also be referenced for detailed information.

NOTICE: This manual should 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 5 [7] Detector Cleaning Procedures 7 [8] Board Replacement 7 [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 DH100 Air Duct Smoke Detectors are 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 at the fire control panel monitoring the detector, 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.

DH100 detectors are designed to operate with 12 or 24 VDC UL listed compatible 2-wire control panels. Alarm current must be limited to 100mA or less by the control panel. Auxiliary relay contacts for control purposes are not available for use with the DH100. Control must initiate from the control panel.

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 DH100 can be reset by a momentary power interruption, the reset button on the front cover, the control panel, or remote reset accessory.

[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 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 DH100 Air Duct Smoke Detectors are listed per UL 268A.

WARNING

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

This device will not sense smoke unless the ventilation system is operating and the cover is installed.

WARNING

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.

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[3] Figure 1: Exploded View Of Duct Detector Components

FOAM

GASKETS

TELESCOPING TUBE

#8 SELF-TAPPING SCREW

DETECTOR BOARD

SAMPLING TUBE

FILTERS

DETECTOR

COVER

CONDUIT HOLES

COVER MOUNTING

DETECTOR

SCREWS

[4] Contents Of The Duct Smoke Detector Kit

1. Complete housing base and cover assembly

2. Two #10 machine 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. Two jack nuts

9. One inlet tube end plug

10. Metal sampling tube end plug

11. One telescoping sampling tube

12. One #8 self-tapping screw for the telescoping sampling tube

NOTE: For ducts over 11/2 feet, longer inlet 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 DH100 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.

HOUSING

TERMINAL STRIP

POWER BOARD

Tube Installation Chart:

Supplemental Duct Tube Holes Width

512″-14″ 614″-16″ 716″-18″

holes as indicated on the template. Insert the two jack nut receptacles. Drive a #10 machine screw into the jacknut to flare the retainer and then back the screw out to use for detector mounting.

[5.2.1] Sampling Tube Installation for Ducts Less Than 11/2 Feet Wide (see Figure 2)

1. Remove the front cover.

2. Use the tube installation chart above to determine the set screw setting.

3. Slide the sampling tube into the housing bushing.

4. Align the holes in the bushing with the holes in the sampling tube. Make sure the number of holes exposed on the supplemental tube matches the number as determined in step 2. Secure with the #8 self-tapping screw into the bottom hole of the permanent tube.

NOTE: For ducts greater than 11/2 feet in width, refer to

sections [5.4.1] and [5.4.2].

Figure 2. Sampling tubes connected to duct smoke detector:

[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

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[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 machine 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:

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[5.4] Sampling Tube Installation of Ducts Greater Than 11/2 Feet Wide

The sampling tube is identified by a series of air inlet holes on the tube. One telescoping 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. 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 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. If the tube is shorter than the width of the air duct, install the end plug into the inlet tube as shown in Figure 4. Sampling tubes over 3 ft. long must be supported at the end opposite the duct 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 plug and tape closed any holes in the protruding section of the tube. Be sure to seal the duct when the tube protrudes.

Figure 4. Air duct detector inlet sampling tube:

FLANGE

AIR HOLES

ARROWS

MUST FACE

INTO AIR FLOW

AIR FLOW DIRECTION

INLET TUBE END PLUG

The inlet 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 arrows. Make sure the inlet tube is mounted so that the arrows point 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. Inlet tubes required for different duct widths:

Outside Duct Width Inlet Tube Required

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

[5.4.1] Installation For Ducts Greater Than 1 1/2 Feet But Less Than 8 Feet Wide

1. If the tube is longer than the width of the air duct, drill a

/4-inch hole in the duct opposite the hole already cut for

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

DOTS INDICATE POSITION OF

SAMPLING TUBE HOLES

INLET TUBE

AIR FLOW

DIRECTION

DUCT DETECTOR HOUSING

A78-1812-08

AIR FLOW

DIRECTION

DUCT DETECTOR HOUSING

TUBE

INLET TUBE

EXHAUST

TUBE

EXHAUST

AIR FLOW

DIRECTION

NOTE: Orientations C and D apply only to metal sampling tubes.

EXHAUST

TUBE

EXHAUST

TUBE

AIR FLOW

DIRECTION

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