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 informa-
tion.
NOTICE:
This manual shall 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.
GENERAL DESCRIPTION
An HVAC system supplies conditioned air to virtually every area of a building. Smoke introduced into this air duct system is 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 DH300PL air duct smoke detector is a photoelectric detector. This smoke detection method combines 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 initiated at
the fire control panel monitoring the detector, and appropriate action can be taken to shut off fans, blowers and change over air handling systems, etc.
This can prevent the distribution or it can isolate toxic smoke and fire gases throughout the areas served by the duct system.
Two LEDs on each detector may illuminate, if programmed by the system control panel, to provide a local alarm indication. There is also a remote
alarm output for use with auxiliary devices. The DH300PL has remote test capability with the RTS451/RTS451KEY Remote Test Station.
CONTENTS OF THE DUCT SMOKE DETECTOR HOUSING KIT
The DH300PL Duct Smoke Detector consists of the following items: (See Figure 1.)
DH300PL INTELLIGENT PHOTOELECTRONIC DUCT SMOKE DETECTOR
WITH EXTENDED AIR SPEED RANGE
INSTALLATION AND MAINTENANCE INSTRUCTIONS
Figure 1: Exploded View Of Duct Smoke Detector Components
NOTE:
For ducts over 1
1
⁄ 2
feet, longer sampling tubes must be ordered to complete the installation. They must be the correct length for the width of
the duct where they will be installed. See Table 1 on page 3 to determine the sampling tube required for different duct widths.
WARNING
LIMITATIONS OF DUCT DETECTORS
WARNING
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 sys-
tem.
1. Complete duct smoke detector assembly with
sensor
2. Two #10 x 1
1/4
″
sheet metal mounting screws
3. Two sampling tube filters
4. One test magnet
5. Drilling template
6. Two foam gaskets
7. Four #6-self tapping mounting screws for
the sampling tube and optional exhaust tube
extension
8. One sampling tube end cap
9. One plastic sampling tube
10. One #8 self-tapping screw for plastic sampling
tube
NOTE: A detector sensor board DOES NOT
need to be ordered separately.
Contents Of The
Duct Smoke Detector
J500-42-00
1
I56-2198-003R
Johnson Controls Inc., 507 E. Michigan St., Milwaukee, WI 53201
FOAM
GASKETS
PLASTIC
SAMPLING TUBE
SAMPLING TUBE
FILTERS
PLASTIC SAMPLING TUBE
SELF-TAPPING SCREW
DETECTOR
COVER
DETECTOR BOARD
CONDUIT HOLES
DETECTOR
HOUSING
TERMINAL STRIP
POWER BOARD
COVER MOUNTING
SCREWS
H0100-00
