D400-14-00
1
I56-554-05
DH400 Air Duct Smoke Detector
INSTALLATION AND MAINTENANCE INSTRUCTIONS
A Division of Pittway
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 de-
tailed 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.
Table of Contents
Page
[1] General Description
1
[2] Exploded View of Duct Detector Components
2
[3] Contents of the Duct Detector Kit
2
[4] Limitations of Duct Detectors
2
[5] Installation Sequence
2
[6] Duct Detector Maintenance and Test Procedures
8
[7] Detector Cleaning Procedures
10
[8] Specifications
12
Warranty
13
Detector Test Log
16
List Of Tables And Figures
Page
Fig. 1: Duct Detector Exploded View
2
Fig. 2: Installation of Sampling Tube Gaskets
3
Fig. 3: Mounting Location of Speed Nuts
3
Table 1: Inlet Sampling Tube Selection
3
Fig. 4: Inlet Sampling Tube
4
Fig. 5: Sampling Tube Mounting Configurations
4
Fig. 6: System Wiring Diagram (2-wire)
6
Fig. 7: Wiring Diagram for Remote Test Station
7
Fig. 8: Sampling Tube Filter Installation
8
Fig. 9: Testing Detector Alarm
9
Fig. 10: Detector Head Removal
9
Fig. 11: RTS451/RTS451KEY Test Coil Installation
10
Fig. 12: Photo Head Exploded View
11
Fig. 13: Ion Head Exploded View
11
[1] 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.
Model DH400 Air Duct Smoke Detectors are supplied with
System Sensor’s model 1451DH ionization detector heads
or model 2451 photoelectronic detector heads. These two
principle smoke detection methods are combined with an
efficient housing design that samples air passing through a
duct and allows detection of a developing hazardous condi-
tion. 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, blow-
ers, 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.
DH400 detectors are designed to operate with 12 or 24 VDC
UL listed compatible 2-wire control panels. Alarm current
must be limited to 100mA or less by the control panel. Aux-
iliary relay contacts for control purposes are not available
for use with the DH400. Control must initiate from the con-
trol panel.
For testing, the alarm can be enabled by a magnet activated
test switch, by insertion of a calibrated test card into the sens-
ing chamber (photoelectronic version only), or by the op-
tional remote test station. The duct smoke detectors latch into
alarm state when alarm occurs. LEDs on each detector illumi-
nate to provide local alarm indication, and the optional
RA400Z accessory offers remote LED annunciation capability.
The DH400 duct detector must be reset by the control panel.
Summary of Contents for DH400
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