Hochiki DH-100-A Analog Addressable Smoke Detector Installation Instructions
These are Installation Instructions (DWG.# HA-06-429) for the DH-100-A Duct Detector, configured with the DH-100-A Duct Housing and the ALN-DH Analog Addressable Photoelectric Smoke Detector. It is designed for use with Hochiki DCP (digital communication protocol). Refer to the control panel manual for compatibility information. The DH-100-A will be identified by the panel as a duct detector with sensitivity limits meeting the table provided in these instructions.
I. Location Requirements
To prevent false alarms, detectors should not be mounted in areas of extreme high or low temperatures, high humidity, or where duct air may contain gases or excess dust. Ideally, the duct detector should be located a minimum of six duct widths downstream from a source of turbulence (bends, inlets, or deflection plates) to ensure a more homogenous air/smoke mixture. Refer to NFPA 90A, 72, and 101 for additional information. See Figure 1.
Figure 1 Description: This diagram illustrates recommended duct placement, suggesting the detector be located a minimum of six duct widths downstream from turbulence sources like bends, inlets, or deflection plates to ensure homogenous air/smoke mixture. An exception allows closer placement if physically necessary, advising to stay as far as possible from obstructions.
II. Mounting the Detector
A. Duct Preparation
- Remove the paper backing from the mounting template (packaged in the installation kit) and affix it to the duct at the desired location on the side or top of the duct.
- Using the template as a guide, drill 4 mounting holes (3/32" diameter) for the duct mounting screws (4 #12 x 1/2" sheet metal screws are packaged in the installation kit).
- Drill or punch holes for the sampling tubes in the air ducts (1-3/8" diameter), using the template as a guide.
- Clean all holes.
B. Verify Air Flow and Direction
The Duct Detectors are designed for use in ducts where air velocities range from 100 to 4000 feet per minute. See Figure 2 for sampling tube orientation relative to air flow direction.
C. Sampling Tube Assembly
The sampling tubes can be ordered to a desired length or in one of three standard lengths and cut per requirements. The intake sampling tube is a piece of steel piping with a series of holes drilled along its entire length and should extend the entire width of the duct. The holes must face into the air flow (see Figure 2). The exhaust tube is 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'
- Cut the intake sampling tube to the desired length.
- Firmly insert the stopper (packaged in the installation kit) into the end of the INTAKE sampling tube.
D. Mount Sampling Tubes
Sampling tube connectors are equipped with set screws, which allow the tubes to be mounted only in the directions shown in Figure 2. Establish proper orientation considering airflow direction.
Insert intake and exhaust tubes into connectors, align the set screw to the set screw hole in the tubes, and tighten firmly.
Figure 2 Description: This figure shows the DH-100 mounting, illustrating the intake and exhaust tubes, the stopper for the intake tube, and the set screw used to secure the tubes in their connectors. It emphasizes aligning the set screw with the hole in the tube and ensuring the intake tube holes face into the airflow.
Figure 3 Description: This figure provides sampling tube orientation details, showing the intake tube extending across the duct width with holes facing the airflow. It also notes that the intake sampling tube should be supported where the duct width is greater than 3 feet.
E. Mount the Duct Housing
Move the duct housing/sampling tube assembly to the desired location. Use the 4 mounting screws (4 #12 x 1/2" sheet metal screws, packaged in the installation kit) to secure the housing to the air duct.
Figure 6 Description: This figure shows the DH-100 cover attachment, indicating how the cover is secured.
Figure 7 Description: This figure illustrates the temporary storage of the DH-100 access hatch cover during installation.
F. Cover Removal
Remove the access hatch cover by removing the tamper screw, if installed, and depressing the tab. Unscrew the 4 screws on the top of the duct housing; these screws are captive in the housing.
Figure 4A Description: This figure details the DH-100 access hatch cover removal, showing the release tab and the location of the intake (high pressure) and exhaust (low pressure) tube holes and connectors.
G. Verify Air Sampling
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 the input sampling tube and the exhaust tube should be greater than 0.01" of water and less than 1.2" of water. Return the cover and tighten the captive screws.
Figure 5 Description: This figure illustrates the air sampling verification setup using a Dwyer Model 4000 differential pressure gauge (or equivalent). It shows the gauge connections to the intake and exhaust sampling tubes to measure the pressure differential.
III. Electrical Installation
A. 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 detectors are 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.
B. Detector Wiring
With the 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 the cover before restoring power.
C. Terminal Board Wiring
The diagram shows terminal connections for a UL Listed Compatible Control Panel, with terminals labeled S(+), SC(-), and for a remote LED (LED+, LED-). The LED is powered by the SLC loop, limited to 8mA.
IV. 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 and replace it with the included nozzle. Push the nozzle fully into the open smoke port and press the can. The required amount 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.
Figure 8 Description: This figure highlights the DH-100-A test locations, specifically pointing out the smoke port for testing.
Standard Aerosol Testing
Use with Model 25s Aerosol Smoke cans. Follow cover removal instructions on page 1 to expose the detector head. Duct air flow from the sampling ports may affect aerosol smoke entry. Spray at the detector in 1s bursts, plug sampling ports with size 0 stopper or equivalent as needed. When completed, remove any sampling port stopper, return the cover, and tighten the 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. Refer to 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.
Figure 9 Description: This figure shows the DH-100-A cover removed, emphasizing that the metal divider plate must be installed for proper operation. It also indicates aligning posts with detector holes.
Unsupported Tests
The DH-100-A does not support a test switch feature. The DH-100-A does not support a magnetic test feature.
Specifications
| Parameter | Value |
|---|---|
| SLC Applied Voltage | Rated Range 25.3 - 39.5 VDC |
| SLC Current Consumption (Includes detector) | Alarm: 30mA Max |
| Normal Standby: 450uA *Add 6.75mA per SLC loop for panel battery backup calculations. | |
| Operating Temperature Range | 0°C (32°F) ~ 38°C (100°F) |
| Storage Temperature Range | -30°C (-22°F) to 70°C (158°F) |
| Maximum Relative Humidity | 93% RH non-condensing |
| Air Velocity | 100-4,000 FPM |
| Sensitivity | 0.70 - 3.74%/FT @ 100 FPM |
| 0.70 - 3.38%/FT @ 300 FPM | |
| 0.70 - 3.39%/FT @ 1000 FPM | |
| 0.70 - 3.83%/FT @ 2000 FPM | |
| 0.70 - 4.00%/FT @ 3000 FPM | |
| 0.70 - 4.00%/FT @ 4000 FPM | |
| Environment | Indoor dry use only, Duct Side or Top |
| Dimensions | 7.5"W X 9.5"H X 2.5"D |
| Weight | Approximately 3.0lb |
Contact Information:
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 1 of 2)
Hochiki America Corporation * DH-100-A Installation Instructions (HA-06-429. P/N 1700- 12630, Page 2 of 2)
