DETECTOR TEST LOG
Detector Identification Information
Manufacturer and Serial Date
Detector Model: __________________ Number: ___________________ Installed: ________________
Description of Detector Location:
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Test Results and Maintenance Data
Date Test Test Maintenance
Tested Description Results Performed Comments
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N500-04-00 12 I56-507-06
© Notifier 1998
N500-04-00 1 I56-507-06
Notifier, 12 Clintonville Rd., Northford, CT 06472
DHX-502 INTELLIGENT AIR DUCT SMOKE DETECTOR HOUSING
INSTALLATION AND MAINTENANCE INSTRUCTIONS
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 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 cleanded 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 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.
The DHX-502 Air Duct Detector Housings are used with Notifier’s intelligent model CPX-551 ionization detector head
and Model SDX-551 photoelectronic detector head. These two principal smoke detection methods are combined with
an efficient housing design that samples air passing through a duct and allows early 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 and blowers, change over air handling systems, etc.
This can prevent the distribution or isolation of toxic smoke and fire gases throughout the areas served by the duct
system.
Two LEDs on each detector latch ON to provide a local alarm indication. There is also a remote alarm output for use
with auxiliary devices. The DHX-502 has remote test capability with the RTS451/RTS451KEY Remote Test Station.
CONTENTS OF THE DUCT DETECTOR HOUSING KIT
The DHX-502 Air Duct Detector Housings consist of the following items: (See Figure 1.)
See Note 1 on Page 2 for Inlet
Sampling Tube and Detector
Supply information.
SAMPLING TUBE
FILTERS
CONDUIT HOLES
DUCT DETECTOR
HOUSING
TERMINAL STRIP
DUCT DETECTOR
COVER
SAMPLING TUBE
MOUNTING
SCREWS
DETECTOR HEAD
(SUPPLIED SEPARATELY)
EXHAUST
FILTER ADAPTER
DETECTOR BASE
INLET SAMPLING TUBE
(SUPPLIED SEPARATELY)
O-RINGS
FOAM
GASKETS
HOUSING
MOUNTING SCREWS
TEST MAGNET
TUBE
END
PLUG
A78-2093-00
Figure 1.
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