System Sensor DH400ACDCIHT Installation And Maintenance Instructions Manual

INSTALLATION AND MAINTENANCE INSTRUCTIONS
DH400ACDCIHT 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 online at www.systemsensor.com
or via System Sensor's toll free fax-back service, Documents
on Demand at 800/736-7672. NFPA Standards 72 and 90A
should also be referenced for detailed information.
NOTICE: This manual should 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.
This detector is intended for use only with the 1451DHHT
detector head (supplied).

Table of Contents

[1] General Description
[2] Exploded View of Duct Detector Components
[3] Contents of the Duct Detector Kit
[4] Installation Sequence
[5] Duct Detector Maintenance and Test Procedures
[6] Detector Cleaning Procedures
[7] Specifications
[8] DH400 OE-1 Description and Installation
Warranty
List of Tables and Figures
Fig. 1: Duct Detector Exploded View
Fig. 2: Installation of Sampling Tube Gaskets
Fig. 3: Mounting Location of Speed Nuts
Table 1: Inlet Sampling Tube Selection
Fig. 4: Inlet Sampling Tube
Fig. 5: Sampling Tube Mounting Configurations
Fig. 6: Sampling Tube Filter Installation
Fig. 7: Wiring Diagram
Fig. 8: Wiring Diagram - No Control Panel
Fig. 9: Wiring Diagram - Accessories
Fig. 10: Testing Detector Alarm
Fig. 11: Detector Head Removal
Fig. 12: RTS451/RTS451KEY Test Coil Installation
Fig. 13: Ion Head Exploded View
D400-64-00
WARNING
[1] General Description
An HVAC system supplies conditioned air to virtually every
area of a building. Smoke introduced into this air duct sys-
tem will be distributed to the entire building. Smoke detec-
tors designed for use in air duct systems are used to sense
the presence of smoke in the duct.
Model DH400ACDCIHT Air Duct Smoke Detectors are sup-
plied with the model 1451DHHT ionization detector head.
This smoke detection method is combined 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 initi-
ated at the fire control panel monitoring the detector, and
appropriate action can be taken to shut off fans and blow-
ers, 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.
The DH400ACDCIHT air duct smoke detector is designed to
operate from 24 VDC, 24 VAC, 120 VAC, or 240 VAC. Alarm
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and supervisory relay contacts are available for control
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panel interface (alarm initiation), HVAC control, and other
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auxiliary functions. This detector is not designed for 2-wire
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applications.
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For testing, the alarm can be enabled by a magnet activated
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test switch or by the optional remote test station. The duct
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smoke detectors latch into alarm state when alarm occurs.
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LEDs on each detector illuminate to provide local alarm
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indication, and optional accessories offer a variety of
annunciation capabilities.
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2
The detector can be reset by a momentary power inter-
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ruption, by the magnet activated reset switch, or by the
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optional remote test station.
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NOTICE: The DH400ACDCIHT can be installed outdoors
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using the optional accessory DH400 OE-1.
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Please refer to section 9 for a description and
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installation instructions.
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1
3825 Ohio Avenue, St. Charles, Illinois 60174
1-800-SENSOR2, FAX: 630-377-6495
www.systemsensor.com
I56-991-08R