System Sensor DH400ACDCP User Manual

D400-13-00

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I56-555-09R

3825 Ohio Avenue, St. Charles, Illinois 60174

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

www.systemsenor.com

Before Installing
Please  thoroughly  read  the  System  Sensor  Guide  for 
Proper  Use  of  Smoke  Detectors  in  Duct  Applications
(A05-1004),  which  provides  detailed  information  on  de-
tector  spacing,  placement,  zoning,  wiring,  and  special
applications.  Copies  of  this  manual  are  available  online
at www.systemsensor.com or via System Sensor’s toll free
fax-back service, Documents on Demand at 800/736-7672.
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.

[1]  General Description

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[2]  Exploded View of Duct Detector Components

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[3]  Contents of the Duct Detector Kit

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[4]  Limitations of Duct Detectors

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[5]  Installation Sequence

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[6]  Duct Detector Maintenance and Test Procedures

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[7]  Detector Cleaning Procedures

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[8]  Specifications

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Warranty

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Detector Test log

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Fig. 1:  Duct Detector Exploded View

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Fig. 2:  Installation of Sampling Tube Gaskets

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Fig. 3:  Mounting Location of Speed Nuts

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Table 1: Inlet Sampling Tube Selection

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Fig. 4:  Inlet Sampling Tube

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Fig. 5:  Sampling Tube Mounting Configurations

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Fig. 6:  Wiring Diagram

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Fig. 7:  Wiring Diagram – No Control Panel

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Fig. 8:  Wiring Diagram – Accessories

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Fig. 9:  Sampling Tube Filter Installation

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Fig. 10:  Testing Detector Alarm

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Fig. 11:  Detector Head Removal

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Fig. 12: RTS451/RTS451KEY Test Coil Installation

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Fig. 13: Photo Head Exploded View

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[1] General Description
An  HVAC  system  supplies  conditioned  air  to  virtually  ev-
ery 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.

Model  DH400ACDCP  Air  Duct  Smoke  Detector  utilizes
photoelectric  technology  for  the  detection  of  smoke.  This
smoke detection method, when combined with an efficient
housing design, samples air passing through the duct and
allows  detection  of  a  developing  hazardous  condition.
When sufficient smoke is sensed, an alarm signal is initi-
ated at the fire control panel monitoring the detector, and
appropriate action can be taken to shut off fans and 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.

DH400ACDCP  detectors  are  designed  to  operate  from  24
VDC, 24 VAC, 120 VAC, or 240 VAC. Alarm and supervisory
relay  contacts  are  available  for  control  panel  interface
(alarm initiation), HVAC control, and other auxiliary func-
tions.  These  detectors  are  not  designed  for  2-wire  appli-
cation.

For testing, the alarm can be enabled by a magnet activated
test switch, by insertion of a calibrated test card into the
sensing chamber (photoelectronic version only), or by the
optional remote test station. The duct smoke detectors latch
into alarm state when alarm occurs. LEDs on each detector
illuminate to provide local alarm indication, and optional
accessories offer a variety of annunciation capabilities.

The  detector  can  be  reset  by  a  momentary  power  inter-
ruption,  by  the  magnet  activated  reset  switch,  or  by  the
optional remote test station.