System Sensor DH400 Installation And Maintenance Instructions Manual

INSTALLATION AND MAINTENANCE INSTRUCTIONS
DH400 Air Duct Smoke Detector
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

[1] General Description
[2] Exploded View of Duct Detector Components
[3] Contents of the Duct Detector Kit
[4] Limitations of Duct Detectors
[5] Installation Sequence
[6] Duct Detector Maintenance and Test Procedures
[7] Detector Cleaning Procedures
[8] Specifications
Warranty
Detector Test Log
List Of Tables And Figures
Fig. 1: Duct Detector Exploded View
Fig. 2: Installation of Sampling Tube Gaskets
Fig. 3: Mounting Location of Speed Nuts
Table 1: Inlet Sampling Tube Selection
Fig. 4: Inlet Sampling Tube
Fig. 5: Sampling Tube Mounting Configurations
Fig. 6: System Wiring Diagram (2-wire)
Fig. 7: Wiring Diagram for Remote Test Station
Fig. 8: Sampling Tube Filter Installation
Fig. 9: Testing Detector Alarm
Fig. 10: Detector Head Removal
Fig. 11: RTS451/RTS451KEY Test Coil Installation
Fig. 12: Photo Head Exploded View
Fig. 13: Ion Head Exploded View
D400-14-00
[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-
Page ers, change over air handling systems, etc. These actions
1 can facilitate the management of toxic smoke and fire gases
2 throughout the areas served by the duct system.
2
2 DH400 detectors are designed to operate with 12 or 24 VDC
2 UL listed compatible 2-wire control panels. Alarm current
8 must be limited to 100mA or less by the control panel. Aux-
10 iliary relay contacts for control purposes are not available
12 for use with the DH400. Control must initiate from the con-
13 trol panel.
16
For testing, the alarm can be enabled by a magnet activated
Page test switch, by insertion of a calibrated test card into the sens-
2 ing chamber (photoelectronic version only), or by the op-
3 tional remote test station. The duct smoke detectors latch into
3 alarm state when alarm occurs. LEDs on each detector illumi-
3 nate to provide local alarm indication, and the optional
4 RA400Z accessory offers remote LED annunciation capability.
4 The DH400 duct detector must be reset by the control panel.
6
7
8
9
9
10
11
11
1
A Division of Pittway
3825 Ohio Avenue, St. Charles, Illinois 60174
1-800-SENSOR2, FAX: 630-377-6495
I56-554-05