System Sensor DH400ACDC

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D400-13-00 1 I56-555-08

DH400ACDC 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 the System Sensor Guide for Proper

Use of Smoke Detectors in Duct Applications (I56-473),

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: Wiring Diagram 6

Fig. 7: Wiring Diagram – No Control Panel 7

Fig. 8: Wiring Diagram – Accessories 8

Fig. 9: Sampling Tube Filter Installation 8

Fig. 10: Testing Detector Alarm 9

Fig. 11: Detector Head Removal 9

Fig. 12: RTS451/RTS451KEY Test Coil Installation 10

Fig. 13: Photo Head Exploded View 11

Fig. 14: 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 DH400ACDC Air Duct Smoke Detectors are supplied

with model 1451DH ionization detector heads or model

2451 photoelectronic detector heads. These two smoke de-

tection methods are combined with an efficient housing de-

sign that samples air passing through a duct and allows

detection of a developing hazardous condition. When suffi-

cient smoke is sensed, an alarm signal is initiated at the fire

control panel monitoring the detector, and appropriate ac-

tion can be taken to shut off fans and blowers, 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.

DH400ACDC 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 applica-

tion.

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 de-

tector illuminate to provide local alarm indication, and op-

tional accessories offer a variety of annunciation

capabilities.

The detector can be reset by a momentary power interrup-

tion, by the magnet activated reset switch, or by the op-

tional remote test station.

Main Page

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Summary

Product Overview and Pre-Installation

General Description of DH400 ACDC Detector

Describes the function of HVAC air duct smoke detectors and the DH400ACDC model.

Before Installing Guidance

Important pre-installation steps and references for proper use of smoke detectors.

Detector Components and Installation

Contents of the Duct Detector Kit

Lists the components included in the DH400ACDC duct detector kit.

Limitations of Duct Detectors

Outlines limitations and proper usage of duct detectors as per NFPA.

Installation Sequence Steps

Provides a step-by-step guide for installing the duct detector.

Sampling Tube Installation

Explains how to install the inlet sampling tube correctly based on duct width.

Field Wiring Instructions

Provides instructions and compliance guidelines for wiring the detector.

Detector Testing and Maintenance

Filter Installation and Maintenance

Details on how to install and maintain sampling tube filters.

Detector Performance Checks

Procedures for performing detector checks, including magnet and air flow tests.

Standby, Alarm, and Sensitivity Tests

Covers tests for standby, trouble, alarm, and sensitivity verification.

Detector Cleaning Procedures

Instructions for cleaning air filters and detector heads (photo/ion).

Specifications and Warranty

Model DH400 ACDC Specifications

Details environmental limits, mechanical specs, and accessories for the detector.

Electrical Specifications and Ratings

Provides electrical requirements, current loads, and contact ratings.

Three-Year Limited Warranty

Outlines the warranty terms and conditions for the detector.

Detector Test Log