D500-08-00
1
I56-512-07R
DH500 Intelligent Air Duct Smoke
Detector Housing
INSTALLATION AND MAINTENANCE INSTRUCTIONS
3825 Ohio Avenue, St. Charles, Illinois 60174
1-800-SENSOR2, FAX: 630-377-6495
Before Installing
Please thoroughly read System Sensor's
Guide for Proper
Use of Smoke Detectors in Duct Applications
(I56-473-XX),
which provides detailed information on detector spacing,
placement, zoning, wiring, and special applications. Copies
of this manual are available from System Sensor. 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 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 sys-
tem will be distributed to the entire building. Smoke detec-
tors designed for use in air duct systems are used to sense
the presence of smoke in the duct.
The DH500 Air Duct Detector Housings are used with
System Sensor’s intelligent model 1551 ionization detector
head and model 2551 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
Specifications
Length:
14.5 inches
(36.7 cm)
Width:
5 inches
(12.7 cm)
Depth:
3.5 inches
(8.9 cm)
Weight:
2.8 lbs.
(1.1 kg)
Operating Temperature Range:
32° to 120°F (0° to 49°C)
Operating Humidity Range:
10% to 93% Relative Humidity
Duct Air Velocity:
500 – 4000 ft./min. (91.4 – 1219.2 m/min.)
Electrical Ratings for DH500
Voltage Range:
14.5 – 32 VDC Peak
Standby Current (nominal):
150uA at 24 VDC
Power-Up Surge at Max.
Rated Voltage:
1.5mA-sec.
LED current (nominal):
6mA at 24 VDC
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 DH500 has remote test
capability with the RTS451/RTS451KEY Remote Test
Station.
Contents of the Duct Detector Housing Kit
The DH500 consists of the following items: (See Figure 1.)
See Note 1 on Page 2 for inlet sampling tube and detector
supply information.
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.
12. Two #10 speed nuts.
13. One test coil and parts bag.
