INSTALLATION AND MAINTENANCE INSTRUCTIONS
DH500ACDC Intelligent Air Duct
Smoke Detector Housing
Specifications
Length:
Width:
Depth:
Weight:
Operating Temperature Range:
Operating Humidity Range:
Duct Air Velocity:
Power Supply Electrical Ratings
Power
Requirements
Device
DH500ACDC
PA400*
RA400ZA*
RTS451/RTS451KEY*
RTS451**/RTS451KEY
120 VAC (102 - 132)
mA rms MAX.
Standby
44
--
--
--
11.5
Alarm
52
3
1.5
1.5
13
3825 Ohio Avenue
St. Charles, Illinois 60174
1-800-SENSOR2, FAX: 630-377-6495
14.5 inches (36.7 cm.)
5 inches
(12.7 cm.)
4 inches
(10.2 cm.)
4 lbs.
(1.8 kg.)
32° to 120°F (0° to 49°C)
10% to 93% Relative Humidity
500 – 4000 ft./min. (91.4 – 1219.2 m/min.
For DH500ACDC
240 VAC (204 - 264)
mA rms MAX.
Standby
25
--
--
--
5.5
Alarm
30
1.5
1
1
6.5
24 VAC (20.6 - 26.4)
mA rms MAX.
Standby
65
--
--
--
140
Alarm
182
29
17.3
17.3
157
24 VDC (20 - 30)
mA DC MAX.
Standby
26
--
--
--
95
Alarm
87
15
10
10
103
The currents shown for the DH500ACDC are maximum values with no accessories.
* All accessory currents are additional to DH500ACDC. There are no additional currents for accessories in standby.
** RTS451/RTS451KEY when the magnet is held in place to initiate an alarm.
24V output maximum load is 80 mA; auxiliary alarm output maximum load is 20 mA.
Auxiliary Relay Contacts
Minimum contact current must be greater than 500 mA at 24 VDC
10 amps maximum at 30 VDC
10 amps maximum at 250 VAC
Before Installing
Please thoroughly read the System Sensor Manual I56-473-
XX,
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 at no
charge 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 DH500ACDC Air Duct Detector Housings are used with
System Sensor's Model 1551 ionization detector heads and
Model 2551 photoelectronic detector heads (purchased sep-
arately). These two smoke detection methods are combined
with an efficient housing design that samples air passing
through a duct and allows detection of a developing haz-
ardous 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.
This can prevent the distribution of toxic smoke and fire
gases throughout the areas served by the duct system.
1
I56-432-11R
D500-07-00
SYSTEMSENSOR [ SYSTEMSENSOR ADVANCED IDEAS. ]
