System Sensor DH100ACDCP User Manual

INSTALLATION AND MAINTENANCE INSTRUCTIONS

WARNING

DH100ACDCP 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 from System Sensor. 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.

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 8 [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.

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 annunciation capabilities.

The DH100ACDCP can be reset by a momentary power interruption, the reset button on the front cover, the control panel, or remote reset accessory. The DH100ACDCP incor-

porates a cover 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.

[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 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 DH100ACDCP Air Duct Smoke Detectors are listed per UL 268A.

3825 Ohio Avenue, St. Charles, Illinois 60174

A Division of Pittway

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

Model DH100ACDCP Air Duct Smoke Detector utilizes photoelectric technology for the detection of smoke. This detection method, when combined with an efficient housing design, samples air passing through the duct and allows

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.

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

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

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.

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

The DH100ACDCP 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 control, and other auxiliary func-

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.

tions. Auxiliary relays are also provided for fan shut down

D100-68-00 1 I56-1147-12R

[3] 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

COVER MOUNTING

SCREWS

PLASTIC SAMPLING TUBE

SELF-TAPPING SCREW

POWER BOARD

DETECTOR BOARD

[5.2.1] Sampling Tube Installation for Ducts Less

[4] Contents Of The Duct Smoke Detector Kit

1. Complete housing base and cover assembly

2. Two #10×11⁄4″ sheet metal 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. One inlet tube end plug

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 sampling tube. Secure with the #8 self-tapping screw into the bottom of the permanent tube (shown in Fig. 1).

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

sections [5.4.1] and [5.4.2].

9. One plastic sampling tube

10. One #8 self-tapping screw for the plastic sampling tube NOTE: For ducts over 11⁄2 feet, longer inlet sampling tubes

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

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 DH100ACDCP 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.

D100-68-00 2 I56-1147-12R

[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 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

AIR FLOW

DIRECTION

DETECTOR

HOUSING

DOTS INDICATE POSITION OF

SAMPLING TUBE HOLES

AIR FLOW

DIRECTION

DETECTOR

HOUSING

INLET TUBE

EXHAUST

TUBE

AIR FLOW

DIRECTION

EXHAUST

TUBE

INLET TUBE

EXHAUST

TUBE

DETECTOR

HOUSING

AIR FLOW

DIRECTION

EXHAUST

TUBE

INLET TUBE

DETECTOR

HOUSING

HORIZONTAL MOUNTING OF HOUSING

VERTICAL MOUNTING OF HOUSING

WARNING

SCREW HOLES FOR ATTA

CHING HOUSING

DUCT WORK.

INLET TUBE END PLUG

AIR HOLES

ARROWS

MUST FACE

INTO AIR FLOW

AIR FLOW DIRECTION

FLANGE

tube bushings:

A78-2045-00

[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 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 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.

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 where the tube protrudes.

Figure 4. Air duct detector inlet sampling tube:

A78-2047-00

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

Table 1. Inlet tubes required for dif ferent 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

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

[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

inlet tube. Make sure the hole is 1″ to 2″ below the inlet hole on the opposite side of the duct to allow moisture

⁄4″ hole in the duct opposite the hole already cut for the

drainage away from the detector. 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 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.

D100-68-00 3 I56-1147-12R

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.

[5.4.2] Installation For Ducts More Than 8 Feet Wide

NOTE: To install inlet 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 plug into the inlet tube as shown in Figure 4 and support the end opposite the duct smoke detector.

+ 5 hidden pages