System Sensor DH200PL User Manual

INSTALLATION AND MAINTENANCE INSTRUCTIONS

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

DH200PL Intelligent Air Duct Smoke Detector with Extended Air Speed Range

Before installing detectors, please thoroughly read the NEMA 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 from NEMA (National Electrical Manufacturers Association, 2101 L Street NW, Washington, DC 20037). 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.

General Description

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

The DH200PL air duct smoke detector is a photoelectric detector. This smoke detection method combines 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 and change over air handling systems, etc. This can prevent the distribution or it can isolate toxic smoke and fire gases throughout the areas served by the duct system.

Two LEDs on each detector may illuminate, if programmed by the system control panel, to provide a local alarm indication. There is also a remote alarm output for use with auxiliary devices. The DH200PL has remote test capability with the RTS451/RTS451KEY Remote Test Station.

3825 Ohio Avenue, St. Charles, Illinois 60174

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

www.systemsensor.com

Contents of the Duct Smoke Detector Housing Kit

The DH200PL Duct Smoke Detector consists of the following items: (See Figure 1.)

Figure 1. Exploded View Of Duct Smoke Detector Components:

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Contents Of The Duct Smoke Detector

1. Complete duct smoke detector assem bly with sensor

2. Two #10 x 11⁄4″ sheet metal mounting screws

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 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 plastic sampling tube

NOTE: A detector sensor board DOES NOT need to be ordered separately.

NOTE: For ducts over 11⁄2 feet (0.46m), longer sampling tubes must be ordered to complete the installation. They must

D200-38-00 1 I56-1976-004R

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.

Limitations of Duct 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.

It is strongly recommended that the user read NFPA Standards 90A, 72, and 101.

[2.1] Sampling Tube Installation for Ducts Less Than 11⁄2 Feet (0.46m) 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 sam pling tube. Make sure there are 6 exposed holes on the plastic sampling tube. Secure with the #8 self-tapping screw into the bottom of the permanent tube (shown in Fig. 2).

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.

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

In order to function properly, this detector must be installed according to the instructions. Do not exceed the electrical or ambient specifications or the detector will not function properly. This detector must be protected from the elements.

Installation Sequence

Step 1. Verify duct air flow direction and velocity ......... 2

Step 2. Drill the mounting holes .................................. 2

Step 2.1 Install the sampling tube for ducts

less than 11⁄2 feet (0.46m) wide ........................ 2

Step 3. Secure the detector housing to the duct ............ 2

Step 4. Install the sampling tube for ducts

greater than 11⁄2 feet (0.46m) wide .................. 2

Step 4.1 Installation for ducts greater than 11⁄2 feet (0.46m)

but less than 8 feet (2.4m) wide .................... 3

Step 4.2 Installation for ducts more than 8 feet

(2.4m) wide .................................................... 4

Step 5. Install the filters .............................................. 4

Step 6. Field wiring ..................................................... 4

Step 7. Perform detector check .................................... 5

Step 8. Install the cover............................................... 5

Step 9. Detector Maintenance and Test Procedures ....... 5

[1] Verify Duct Air Flow Direction And Velocity

The DH200PL duct smoke detector is designed to be used in air handling systems having air velocities of 100 to 4000 feet per minute (0.5 to 20.32m/s). 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. See Air Flow Test, section 9.1.

[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.

NOTE: For ducts greater than 11⁄2 feet (0.46m) in width, refer to sections [4], [4.1] and [4.2].

[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.

[4] Sampling Tube Installation for Ducts Greater Than 11⁄2 Feet (0.46m) 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 11⁄2 feet (0.46m) wide. 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

⁄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 (50mm) 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 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 a metal sampling tube is installed and the air flows directly into the sampling tube holes as indicated in Figure 4.

Figure 2. Plastic sampling tube connected to duct smoke detector:

H0110-00

D200-38-00 2 I56-1976-004R

SCREW HOLES FOR ATTACHING HOUSING TO DUCT WORK.

[4.1] Installation For Ducts Greater Than 11⁄ 2 Feet

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

(0.46m) But Less Than 8 Feet (2.4m) Wide

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

a 3⁄4″ (19mm) hole in the duct opposite the hole already cut for the sampling tube. Make sure the hole is 1″ to 2″ (25 to 50mm) 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. (0.91m) 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, as shown in Figure 4.

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″ (25 to 50mm) 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.

Figure 4. Air duct detector sampling tube:

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

NOTE: The sampling tube end cap is critical to the proper operation of the duct smoke detectors. The end cap is

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needed to create the proper air flow to the sensor of the duct smoke detector.

NOTE: Only metal sampling tubes can be installed in

orientations C and D.

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

[4.2] Installation For Ducts More Than 8 Feet (2.4m) Wide

NOTE: To install sampling tubes in ducts more than 8 feet

(2.4m) wide, work must be performed inside the air duct. Sampling of air in ducts wider than 8 feet (2.4m) 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.

H0107-00

Table 1. Sampling tubes recommended for different duct widths: Outside Duct Width Sampling Tube Recommended*

1 to 2 ft. (0.3 to 0.6 m) ST-1.5 2 to 4 ft. (0.6 to 1.2 m) ST-3 4 to 8 ft. (1.2 to 2.4 m) ST-5 8 to 12 ft. (2.4 to 3.7 m) ST-10 *Must extend a minimum of

D200-38-00 3 I56-1976-004R

⁄3 the duct width

Install the sampling tube as follows:

1. Drill a 3⁄4-inch (19mm) hole in the duct directly opposite the hole already drilled for the sampling tube. Make sure the hole is 1″ to 2″ (25 to 50mm) 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.

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