[2] GENERAL DESCRIPTION
Smoke introduced into this air duct system will be distributed throughout the
entire building. Smoke detectors designed for use in air duct systems are used
to sense the presence of smoke in the duct.
Model DNRA Air Duct Smoke Detector uses photoelectric technology for the
detection of smoke. This detection method, when combined with an efficient
housing design, samples air passing through the 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 appro-
priate action can be taken to shut off fans, blowers, 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 DNRA incorporates a sensor cover tamper feature that provides a trou-
ble signal at the panel immediately if the cover is removed or improperly in-
stalled. Proper installation of the sensor cover removes the trouble condition.
When programmed with the system control panel, two LEDs on each duct
smoke detector light to provide local visible indication.
The DNRA provides a remote alarm output for use with auxiliary devices,
such as the RA100ZA remote LED annunciator, as well as remote test capabil-
ity with the RTS151 or RTS151KEY-A Remote Test Stations.
[2.1] DETECTOR FEATURE SET
– Uses plug-in head ULC-listed as compatible with the system control panel
– Sampling tubes install from front and rear
– Compatible with existing accessories
– Able to address detector per code switches on sensor head
[3] CONTENTS OF THE DUCT SMOKE DETECTOR KIT
1. Sensor/power board assembly, covers, and factory-installed sensor head
2. Three #10 sheet metal screws for mounting
3. Drilling template
4. One sampling tube end cap
5. One plastic exhaust tube
NOTE: A DST sampling tube must be ordered to complete the installation. It
must be the correct length for the width of the duct where it will be installed.
See Table 1 on page 2 to determine the inlet tube required for different
duct widths.
SPECIFICATIONS
Operating Temperature:
–4° to 158° F (–20° to 70° C);
32° F to 120° F (0° C to 49° C) with module installed in the DNRA
Storage Temperature:
–22° to 158° F (–30° to 70° C)
Humidity:
0% to 93% Relative Humidity Non-condensing
Air Velocity:
100 to 4000 ft./min. (0.5 to 20.3 m/sec.)
Rectangular Footprint Dimensions: 14.38 in L × 5 in W × 2.5 in D (37 cm L × 12.7 cm W × 6.36 cm D)
Square Footprint Dimensions:
7.75 in L × 9 in W × 2.5 in D (19.7 cm L × 22.9 cm W × 6.35 cm D)
Weight:
1.6 pounds; 0.73 kg
Electrical (See applicable detector head installation manual for electrical specifications. To determine applicable sensor head, use the Base/Sensor Cross Reference
chart at www.systemsensor.com (available on the Tools menu).
TABLE OF CONTENTS
PAGE
[1] Limitations of Duct Smoke Detectors ................................................ 1
[2] General Description ......................................................................... 1
[3] Contents of the Duct Smoke Detector Kit .......................................... 1
[4] Detector Installation ....................................................................... 2
[6] Measurement Tests .......................................................................... 3
[7] Field Wiring; Installation Guidelines ................................................. 4
[8] Verification of Operation ................................................................. 4
[9] Cleaning ......................................................................................... 5
[10] Sensor Replacement ....................................................................... 5
[11] Optional Accessories ..................................................................... 5
Three-Year Limited Warranty ................................................................. 6
BEFORE INSTALLING
Read System Sensor’s
Applications Guide for Duct Smoke Detectors
(HVAG53),
which provides detailed information on detector spacing, placement,
zoning, wiring, and special applications. This manual is available online at
www.systemsensor.com. NFPA Standards 72, 90A and CAN/ULC-S524 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 follow-
ing CAN/ULC-S524 requirements. The detector should be visually inspected
semiannually and functionally tested at least once a year. This may need to be
more frequent depending on the air quality of the duct supply air.
[1] LIMITATIONS OF DUCT SMOKE DETECTORS
WARNING
The National Fire Protection Association has established that DUCT DETEC-
TORS 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.
System Sensor supports this position and strongly recommends that the user
read NFPA Standards 90A, 72,101 and CAN/ULC-S524. The DNRA Air Duct
Smoke Detectors are ULC listed.
This device will not operate without electrical power. Fire situations may
cause an interruption of power. The system safeguards should be discussed
with your local fire protection specialist.
This device will not sense smoke unless the ventilation system is operating
and the cover is installed.
For this detector to function properly, it MUST be installed according to the in-
structions in this manual. Furthermore, the detector MUST be operated within
ALL electrical and environmental specifications listed in this manual and the
sensor head installation manual. Failure to comply with these requirements
may prevent the detector from activating when smoke is present in the air
duct.
I56-3
104-004
INSTALLATION AND MAINTENANCE INSTRUCTIONS
DNRA
Duct Smoke Detector
ACCESSORY CURRENT LOADS AT 24 VDC
DEVICE
STANDBY
ALARM
RA100ZA
0mA
12mA Max.
RTS151
0mA
12mA Max.
RTS151KEY-A
12mA
12mA Max.
Only (A) models are ULC listed.
3333 Unity Drive, Mississauga, Ontario L5L 3S6
800/736-7672, FAX: 905-812-0771
www.systemsensor.ca
1
I56-3104-004
4/18/2019
