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DHX-502
Maintenance Manual
6 pgs205.9 Kb0

Notifier DHX-502 Maintenance Manual

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DETECTOR TEST LOG
Detector Identification Information
Manufacturer and Serial Date Detector Model: __________________ Number:___________________ Installed: ________________
Description of Detector Location:
_____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________
Test Results and Maintenance Data
Date Test Test Maintenance
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.
1. Complete housing base and cover assembly.
2. Two #10 sheet metal mounting screws.
3. Two sampling tube filters.
4. One test magnet.
5. Drilling template.
6. Two 5/16-inch O-rings.
7. Two rubber tube bushings seals.
8. Four #6 self-tapping mounting screws for the sampling tube.
9. One filter adapter.
10.One inlet tube end plug.
11.Four #6x7/10 cover mounting screws.
11.Two #10 speed nuts. Note 1:The inlet sampling tube must be ordered separately. It must be the correct length for the width of the duct
where it will be installed. See Table 1 to determine the inlet tube required for different duct widths. Smoke detector heads (CPX-551, ionization; SDX-551, photoelectronic) must be ordered separately.
WARNING
LIMITATIONS OF DUCT 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.
Notifier supports this position and strongly recommends that the user read NFPA Standards 90A, 72, and 101. The DHX-502 is listed per CAN/ULC-S529.
WARNING: This device will not operate without electrical power. Frequently, fire situations may cause an
interruption of power to the detector. The system safeguards should be discussed with your local fire protection specialist.
WARNING: This device will not sense smoke unless the ventilation system is operating. WARNING: In order to function properly, this detector must be installed according to these instructions. Do not
exceed the electrical or ambient specifications or the detector will not function properly. This detector must be protected from the elements.
INSTALLATION SEQUENCE PAGE
Step 1. Verify duct air flow direction and velocity.......................................................................................................... 2
Step 2. Drill the mounting holes...................................................................................................................................... 3
Step 3. Secure the housing base to the duct ................................................................................................................. 3
Step 4. Install the inlet sampling tube ............................................................................................................................ 3
Step 5. Field wiring .......................................................................................................................................................... 5
Step 6. Install the filters and check pressure differential .............................................................................................. 5
Step 7. Perform detector check ...................................................................................................................................... 7
Step 8. Install the cover................................................................................................................................................... 8
Step 9. Perform the final system check (Testing).......................................................................................................... 8
STEP 1. VERIFY DUCT AIR FLOW DIRECTION AND VELOCITY
The DHX-502 is 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, a velocity meter to check the air velocity in the duct.
N500-04-00 2 I56-507-06 N500-04-00 11 I56-507-06
NOTES
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