HOCHIKI DH-100-A Addressable Duct Detector Installation Guide

HOCHIKI DH-100-A Addressable Duct Detector

Product Information

The DH-100-A Analog Addressable Smoke Detector is a duct detector designed for use in air ducts. It is configured with the ALN-DH Analog Addressable Photoelectric Smoke Detector and is compatible with Hochiki DCP (digital communication protocol). The detector is identified by the control panel as a duct detector with sensitivity limits specified in the table on page 2 of the installation instructions.

Location Requirements

Before installing the DH-100-A, ensure that the location meets the following requirements:

• Proper air flow and direction within the duct
• Suitable air velocities of 100 to 4000 feet per minute

Mounting the Detector

Follow these steps to mount the DH-100-A Duct Detector:

Duct Preparation

1. Remove the paper backing from the mounting template included in the installation kit.
2. Affix the mounting template to the desired location on the side or top of the duct.
3. Using the template as a guide, drill four mounting holes (3/32diameter) for the duct mounting screws (four #12 x 1/2 sheet metal screws included in the installation kit).
4. Drill or punch holes for sampling tubes in air ducts (1-3/8diameter) using the template as a guide.
5. Clean all holes.

Verify Air Flow and Direction

Ensure that the air flow direction is compatible with the DH-100-A Duct Detector. Refer to Figure 2 for the correct sampling tube orientation.

Sampling Tube Assembly

Assemble the sampling tubes as follows:

• The intake sampling tube should be a piece of steel piping withholes drilled along its entire length. The holes must face into the air flow.
• The exhaust tube is a piece of steel piping approximately 7-1/2 inches long.

Mount Sampling Tubes

1. Sampling tube connectors have set screws that allow mounting in specific directions. Refer to Figure 2 for the correct orientation based on airflow direction.
2. Insert the intake and exhaust tubes into the connectors,aligning the set screws with the corresponding holes in thetubes.
3. Tighten the set screws firmly.

Mount the Duct Housing

Move the duct housing/sampling tube assembly to the desired location and use four mounting screws (four #12 x 3/4 sheet metal screws included in the installation kit) to secure the housing to the air duct.

Cover Removal

To access the detector, follow these steps:

1. If installed, remove the tamper screw securing the access hatch cover.
2. Depress the tab to release the access hatch cover.
3. Unscrew the four screws on the top of the duct housing. The screws are captive in the housing.

Air Sampling Verification

To verify proper air sampling, use a Dwyer Model 4000 differential pressure gauge (or equivalent). Refer to Figure 5 for gauge connections. The pressure differential between the input sampling tube and exhaust tube should be greater than 0.01 of water and less than 1.2 of water.

Once verified, return the cover and tighten the captive screws.

INSTALLATION INSTRUCTIONS

DH-100-A ANALOG ADDRESSABLE SMOKE DETECTOR

These are Installation Instructions (DWG.# HA-06-429) for the DH-100-A Duct Detector configured as follows:

• DH-100-A Duct Housing with the ALN-DH Analog Addressable Photoelectric Smoke Detector
• For use with Hochiki DCP (digital communication protocol). See control panel manual for compatibility information. DH-100-A shall be identified by the panel as a duct detector with sensitivity limits meeting table on page 2 of these instructions.

LOCATION REQUIREMENTS

To prevent false alarms the detectors should not be mounted in areas of extreme high or low temperatures, in areas where high humidity exist, or in areas where duct air may contain gases or excess dust. The duct detector should, when possible, be located a minimum of six duct widths downstream from a source of turbulence (bends, inlets, or deflection plates). At theselocations, air flow is less turbulent and the air/smoke mixture should be more homogenous.Refer to NFPA 90A, 72, and 101for more information. See Figure

1. Exception: Where it is physically impossible to locate the duct detector accordingly, the duct detector can be positioned closer than six duct widths, but as far as possible from inlets, bends, or deflection plates.

MOUNTING THE DETECTOR

DUCT PREPARATION

1. Remove paper backing from mounting template (packaged in installation kit) and affix to duct at desired location on the side or top of duct.
2. Using template as a guide, drill 4 mounting holes (3/32″ diameter) for duct mounting screws (4 #12 x 1/2″ sheet metal screws packaged in installation kit).

Drill or punch holes for sampling tubes in air ducts (1-3/8″ diameter), using template as a guide. Clean all holes.

VERIFY AIR FLOW AND DIRECTION

The Duct Detectors are designed for use in ducts where the air velocities are from 100 to 4000 feet per minute. See Figure 2 for sampling tube orientation to air flow direction.

SAMPLING TUBE ASSEMBLY (See Figure 2)

The sampling tubes may be ordered to a desired length or ordered in one of 3 standard lengths and cut per requirements. The intake sampling tube consists of a piece of steel piping with a series of holes drilled the entire length of the tube and should extend the entire width of the duct. The holes must be facing into the air flow (see Figure 2). The exhaust tube consists of a piece of steel piping approximately 7-1/2″ long.

INTAKE SAMPLING TUBES STANDARD LENGTHS:

• STS-2.5 For duct widths of 1.0′ to 2.5′
• STS-5.0 For duct widths of 2.5′ to 5.0′
• STS-10.0 For duct widths of 5.0′ to 10.0′

1. Cut the intake sampling tube to the desired length.
2. Firmly insert the stopper (packaged in installation kit) in the end of the INTAKE sampling tube.

MOUNT SAMPLING TUBES (See Figure 2)

1. Sampling tube connectors are equipped with set screws, which allow the tubes to be mounted only in directions shown in Figure 2. Establish proper orientationconsidering airflow direction.
2. Insert intake and exhaust tubes into connectors, align set screw to set screw hole in tubes and tighten firmly.

MOUNT THE DUCT HOUSING (See Figure 1B & 2)

Move duct housing/sampling tube assembly to desired location. Use 4 mounting screws (4 #12 x 3/4″) sheet metal screws, packaged in installation kit) to secure the housing to the air duct.

COVER REMOVAL (See Figure 1B & 2)

Remove the access hatch cover by removing tamper screw if installed, and depressing the tab. Unscrew the 4 screws on the top of the duct housing, screws are captive in the housing.

VERIFY AIR SAMPLING (See Figure 3)

To verify proper sampling of air, use a Dwyer Model 4000 differential pressure gauge (or equivalent). See Figure 5 for gauge connections (ALN-DH detector not shown). The pressure differential between input sampling tube andexhaust tube should be greater than 0.01″ of water and less than 1.2″ of water. Return cover and tighten captive screws.

ELECTRICAL INSTALLATION

GENERAL INFORMATION

Wiring must conform to applicable local codes, ordinances and regulations covering these types of devices. Wire the detectors according to the engineering drawings for the particular job requirements. These detectorsare not intended for open area protection, nor should they be used for open air protection. Refer to NFPA 90A and NFPA 72 for general and additional information on Duct Smoke Detectors concerning operation and installation. Terminals are suitable for up to #14 gauge wire.

DETECTOR WIRING

With power source de-energized, wire all connections per instructions on page 2. The wiring access hatch cover can be stored at the top of the unit. Return cover before restoring power.

TERMINAL BOARD WIRING

TESTING THE INSTALLATION

Smoke Port Testing:
Use with model 25s Aerosol Smoke cans.
The DH-100-A has a smoke port for the introduction of smoke or simulated smoke without cover removal by lifting the port tab. To test with aerosol smoke, remove the stock aerosol nozzle andreplace with included nozzle. Push nozzle fully into the open smoke port and press can. The requiredamount of aerosol is dependent on the duct air velocity, see below for estimated activations:

• 100-1,000 FPM: 1s, 1 activation
• 1,000-2,000 FPM: 2s, 1 activation
• 2,000-3,000 FPM: 4s, 1 activation
• 3,000-4,000 FPM: 8s, 1 activation

The port must be closed after testing to avoid air leakage from the DH-100-A housing.

Standard Aerosol Testing:
Use with model 25s Aerosol Smoke cans.
Follow cover removal instructions on page 1 to expose detector head. Duct air flow from thesampling ports may affect aerosol smoke entry. Spray at detector in 1s bursts, plug sampling portswith size 0 stopper or equivalent as needed. When completed, remove any sampling port stopper, return cover and tighten captive screws.

Panel Calibration and Detector Head Maintenance:
The DH-100-A housing with ALN-DH detector head can be calibrated by a compatible U.L. Listed analog control panel. See the FACP Installation Instructions for specific directions, and Technical Bulletin TB-006 Sensor Health. The ALN-DH may be cleaned per ALN-V cleaning instructions. To access the detector head, follow cover removal instructions on page 1. The metal divider plate is removable from the detector head; the divider plate must be installed before reinstalling the DH-100-A cover, see Figure 9.

Unsupported Tests:

• DH-100-A does not support a test switch feature.
• DH-100-A does not support a magnetic test feature.

HOCHIKI AMERICA CORPORATION

• 7051 Village Drive Suite 100
• Buena Park, CA 90621-2268
• Phone: 714/522-2246
• Fax: 714/522-2268
• Technical Support: 800/845-6692 or technicalsupport@hochiki.com.

Hochiki America Corporation

• DH-100-A Installation Instructions (HA-06-429. P/N 1700- 12630, Page 2 of 2)

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