FOAM
GASKETS
SAMPLING TUBE
SAMPLING TUBE
FILTERS
DETECTOR
COVER
DETECTOR BOARD
CONDUIT HOLES
DETECTOR
HOUSING
TERMINAL STRIP
POWER BOARD
COVER MOUNTING
SCREWS
J500-41-00
1
I56-2199-003R
Johnson Controls, Inc., 507 E. Michigan St., Milwaukee, WI 53201
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 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 DH300RPL 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 DH300RPL has remote test capability with the RTS451/RTS451KEY Remote Test Station. The
DH300RPL incorporates a cover tamper feature. When the cover is removed for more than 20 minutes, the unit loses communication at the panel, a
trouble is indicated at the panel and the alarm relay switches states thereby shutting down fans, dampers and blowers. In the case when the sensor
is removed or when there is no power to the unit, only a trouble is indicated at the panel (alarm relay does not work any longer).
CONTENTS OF THE DUCT SMOKE DETECTOR HOUSING KIT
The DH300RPL Duct Smoke Detector consists of the following items
(See Figure 1.):
DH300RPL 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.
Contents Of The Duct Smoke
Detector
1. Complete duct smoke detector assembly with
sensor
2. Two #10 x
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.
H0129-00
