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SS-400-006 1 I56-3535-002R

Table of Contents Page

[1] Limitations of Duct Smoke Detectors .......................... 1

[2] General Description ...................................... 1

[3] Contents of the Duct Smoke Detector Kit .......................2

[4] Detector Installation ......................................2

[5] Sampling Tube Installation .................................3

[6] Measurement Tests .......................................3

[7] Field Wiring ............................................4

[8] Verification of Operation ...................................4

[9] Dectector Cleaning Procedures ..............................5

[10] Sensor Replacement .....................................5

Warranty ................................................. 6

BEFORE INSTALLING

Please thoroughly read System Sensor’s Guide for Proper Use of Smoke Detec-

tors in Duct Applications (I56-473-XX), which provides detailed information

on detector spacing, placement, zoning, wiring, and special applications. Cop-

ies of this manual are available from System Sensor. NFPA Standards 72, 76,

and 90A should also be referenced for detailed information.

NOTICE: This manual should be left with the owner/user of this equipment.

All sensors must be tested after installation and periodically thereafter. Test-

ing methods must satisfy the Authority Having Jurisdiction (AHJ). Sensors

offer maximum performance when tested and maintained in compliance with

NFPA 72.

SPECIFICATIONS

Length: 14.4 inches

Width: 5.0 inches

Depth: 2.9 inches

Weight: 1.6 pounds

Operating Temperature Range: 32° to 100°F (0° to 38°C)

Operating Humidity Range: 10% to 93% Relative Humidity

Duct Air Velocity: 300 – 4000 ft./min.

Voltage Range: 15 – 32 VDC Peak

Standby Current (nominal): 230uA at 24 VDC (no communication)

330uA at 24 VDC (one communication every 5 sec. with LED enabled)

LED current (nominal): 6.5mA at 24 VDC

[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, and 101. The DNRHS Air Duct Smoke Detectors

are listed per UL 268A.

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

instructions 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.

[2] 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. In facilities with large air changes per

hour, airflow can carry smoke particles directly to the HVAC system. Per NFPA

76 Very Early Warning Fire Detection (VEWFD) sensors shall be installed to

monitor return air from the space. The DNRHS can be installed to monitor the

return air from the space in order to meet NFPA 76 requirements.

I56-3535-002R

DNRHS Intelligent

Air Duct Smoke Detector

INSTALLATION AND MAINTENANCE INSTRUCTIONS

3825 Ohio Avenue, St. Charles, Illinois 60174

1-800-SENSOR2, FAX: 630-377-6495

www.systemsensor.com

H0569-06

EXHAUST TUBE

SENSOR HEAD

SENSOR MODULE COVER

WIRING COMPARTMENT COVER

WIRING COMPARTMENT

SENSOR MODULE

SAMPLING

TUBE

NOTE: SENSOR HEAD IS ONLY

INCLUDED ON SPECIFIED MODELS.

SOLD

SEPERATELY

FIGURE 1:

Summary of content (8 pages)

PAGE 1
I56-3535-002R INSTALLATION AND MAINTENANCE INSTRUCTIONS DNRHS Intelligent Air Duct Smoke Detector Specifications Length: Width: Depth: Weight: Operating Temperature Range: Operating Humidity Range: Duct Air Velocity: Voltage Range: Standby Current (nominal): LED current (nominal): 3825 Ohio Avenue, St. Charles, Illinois 60174 1-800-SENSOR2, FAX: 630-377-6495 www.systemsensor.com 14.4 inches 5.0 inches 2.9 inches 1.6 pounds 32° to 100°F (0° to 38°C) 10% to 93% Relative Humidity 300 – 4000 ft./min.
PAGE 2
The DNRHS Air Duct Smoke Detector uses a 7251 laser smoke sensor. This smoke detection method combined with an efficient housing design that samples air passing through a duct provides 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.
PAGE 3
[4.4]Secure the Duct Detector to the Duct 2. For tubes longer than the width of the air duct, the tube should extend out of the opposite side of the duct. Drill a ¾ inch hole in the duct opposite the hole already cut for the sampling tube. Ensure that the sampling tube is angled downward from the duct smoke detector to allow for moisture drainage away from the detector. The sampling tube should be angled at least 1⁄4” downward for every 12” of duct width.
PAGE 4
for 15 seconds. With both HIGH and LOW pressure ports open to ambient air, measure and record the voltage drop across the 1000Ω resistor (measurement 1), 4.00 volts is typical. Using flexible tubing and rubber stoppers, connect the HIGH side of the transmitter to the sampling tube of the duct smoke detector housing, and the LOW side of the transmitter to the exhaust tube of the duct smoke detector housing. Measure and record the voltage drop across the 1000Ω resistor (measurement 2).
PAGE 5
figure 10. DNRHS with test coil CAUTION Canned aerosol simulated smoke (canned smoke agent) formulas will vary by manufacturer. Misuse or overuse to these products may have long term adverse effects on the smoke detector. Consult the canned smoke agent manufacturer’s published instructions for any further warnings or caution statements.
PAGE 6
Please refer to insert for the Limitations of Fire Alarm Systems Three-Year Limited Warranty System Sensor warrants its enclosed product to be free from defects in materials and workmanship under normal use and service for a period of three years from date of manufacture. System Sensor makes no other express warranty for the enclosed product. No agent, representative, dealer, or employee of the Company has the authority to increase or alter the obligations or limitations of this Warranty.
PAGE 7
SS-400-006 7 I56-3535-002R
PAGE 8
DETECTOR TEST LOG Detector Identification Information Manufacturer & Detector Model: Serial Number: Date Installed: Description of Detector Location: The Results and Maintenance Data Date Tested SS-400-006 Test Description Maintenance Performed Test Results 8 Comments I56-3535-002R ©2012 System Sensor