System Sensor DH200RPL User Manual

INSTALLATION AND MAINTENANCE INSTRUCTIONS

FOAM

GASKETS

SAMPLING TUBE

FILTERS

DETECTOR

COVER

DETECTOR BOARD

CONDUIT HOLES

DETECTOR

HOUSING

TERMINAL STRIP

POWER BOARD

COVER MOUNTING

SCREWS

DH200RPL 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 ref-

erenced 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 fol-

lowing 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 distrib-

uted 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 DH200RPL air duct smoke detector is 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 DH200RPL has remote

test capability with the RTS451/RTS451KEY Remote Test Station.

The DH200RPL incorporates a cover tamper feature. When the cover is

removed for more than 20 minutes, the unit loses communication at the

panel, a trouble is indicated at the panel and the alarm relay switches

states thereby shutting down fans, dampers and blowers. In the case

when the sensor is removed or when there is no power to the unit, only a

trouble is indicated at the panel (alarm relay does not work any longer).

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 DH200RPL Duct Smoke Detector consists of the following items

(See Figure 1.):

Figure 1. Exploded View Of Duct Smoke Detector Components:

NOTE: For ducts over 11⁄2 feet (0.46m), 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.

D200-39-00 1 I56-1977-004R

Contents Of The Duct Smoke Detector

1. Complete duct smoke detector assembly 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.

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.

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 operat-

ing.

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 DH200RPL duct smoke detector is designed to be used in air han-

dling 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.

[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 sampling 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).

NOTE: For ducts greater than 11⁄2 feet (0.46m) in width, refer to sec-

tions [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 1

⁄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 speci-

fied in Table 1, for width of the duct where it will be installed. It is recom-

mended 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 (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:

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

D200-39-00 2 I56-1977-004R

SCREW HOLES FOR ATTA

CHING HOUSING

DUCT WORK.

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

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.

NOTE: The sampling tube end cap is critical to the proper operation of the

duct smoke detectors. The end cap is needed to create the proper air flow

to the sensor of the duct smoke detector.

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

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

NOTE: Only metal sampling tubes can be installed in

orientations C and D.

[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 detec-

tor.

Install the sampling tube as follows:

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 2⁄3 the duct width

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.

3. From inside the duct, couple the other sections of the sampling tube

Figure 4. Air duct detector sampling tube:

to the section already installed using the 1⁄2-inch conduit fittings sup-

plied. Make sure that the holes on both of the sampling 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″

(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.

H0108-02

D200-39-00 3 I56-1977-004R

NOTE: An alternate method to using the ST-10 is to use two ST-5 sam-

pling tubes. Remove the flange from one of the tubes and install

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.

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