System Sensor DH100LP User Manual

INSTALLATION AND MAINTENANCE INSTRUCTIONS

WARNING

DH100LP Air Duct Smoke Detector with Extended Air Speed Range

The Innovair DH100LP 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 has 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.

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.

DH100LP detectors are designed to operate with 12/24VDC UL listed compatible 2-wire control panels. Alarm current must be limited to 130mA or less by the control panel. Auxiliary relay contacts for control purposes are not available for use with the DH100LP. Control must initiate from the control panel.

For testing, the alarm can be enabled by a magnet activated

3825 Ohio Avenue, St. Charles, Illinois 60174

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

test switch or by the optional remote test station. The duct

NOTICE: This manual shall be left with the owner/user of this equipment.

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

IMPORTANT: This detector must be tested and maintained

offer a variety of annunciation capabilities.

regularly following NFPA 72 requirements. The detector should be cleaned at least once a year.

The DH100LP can be reset by a momentary power interruption, the reset button on the front cover, the control panel,

Table of Contents Page

or remote reset accessory.

[1] General Description ................................................... 1

[2] Limitations of Duct Smoke Detectors........................... 1

[2] Limitations Of Duct Smoke Detectors

[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

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.

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

System Sensor supports this position and strongly recom-

[1] General Description

An HVAC system supplies conditioned air to virtually every area of a building. Smoke introduced into this air duct

mends that the user read NFPA Standards 90A, 72, and 101. The DH100LP Air Duct Smoke Detectors are listed per UL 268A.

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

Model DH100LP Air Duct Smoke Detectors utilizes photoelectric technology for the detection of smoke. This detec-

system safeguards should be discussed with your local fire protection specialist.

tion 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 at the

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

fire control panel monitoring the detector, and appropriate

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WARNING

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

FOAM

GASKETS

PLASTIC

SAMPLING TUBE

FILTERS

PLASTIC SAMPLING TUBE

SELF-TAPPING SCREW

DETECTOR

COVER

DETECTOR BOARD

CONDUIT HOLES

DETECTOR

HOUSING

TERMINAL STRIP

POWER BOARD

COVER MOUNTING

SCREWS

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.

[4] Contents Of The Duct Smoke Detector Kit

1. Complete housing base and cover assembly

Two #10 x 11⁄4

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. Metal sampling tube end plug

10. One plastic sampling tube

11. One #8 self-tapping screw for the plastic sampling tube

NOTE: For ducts over 11⁄2 feet, longer sampling tubes must

[5] Installation Sequence [5.1] Verify Duct Air Flow Direction And Velocity

Model DH100LP 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.

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” sheet metal machine screws for mounting

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.

[5.2] 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 six exposed holes on the plastic sampling tube. Secure with the #8 self-tapping screw into the bottom hole of the permanent tube.

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. Sampling tubes connected to duct smoke

detector:

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

[5.3] Secure The Detector Housing To The Duct

SCREW HOLES FOR ATTA

CHING HOUSING

DUCT WORK.

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:

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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 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.

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 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 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 when 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 inlet 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:

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

the duct width

⁄3

NOTE: Only metal sampling tubes may be used on orientations C and D.

*Must extend a minimum of

[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

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

the sampling tube. Make sure the hole is 1″ to 2″ below

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