Greystone DH100ACDCPA, DH100ACDCIA Installation And Maintenance Manual

INSTALLATION AND MAINTENANCE

150 English Drive, Moncton, NB, E1E 4G7 CANADA

DH100ACDCIA & DH100ACDCPA

Air Duct Smoke Detector

tel: [phone] fax: [phone]

e-mail: [e-mail]

www.greystoneenergy.com

Before Installing

ULC standard CAN/ULC-S524-M91 “Standard For The Installa­tion Of Fire Alarm Systems” should be referenced for Canadian
Installations information. For additional reference the System
Sensor

plications

Guide for Proper Use of Smoke Detectors in Duct Ap-

(I56-473), provides detailed information on detector
spacing, placement, zoning, wiring, and special applications.
Copies of this manual are available from System Sensor.
NOTICE: This manual should be left with the owner/user of
this equipment.
IMPORT ANT: This detector must be tested and maintained
regularly following CAN/ULC-S536-97 requirements. The
detector should be cleaned at least once a year.

T able of Contents Page
[1] General Description 1
[2] Limitations of Duct Smoke Detectors 1
[3] Exploded View of Duct Smoke Detector Components 2
[4] Contents of the Duct Smoke Detector Kit 2
[5] Installation Sequence 2
[6] Duct Smoke Detector Maintenance and T est Procedures5
[7] Detector Cleaning Procedures 7
[8] Board Replacement 8
[9] Specifications 8
[10] Warranty 8

[1] General Description

An HV AC system supplies conditioned air to virtually every
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 DH100ACDCA Air Duct Smoke Detectors are sup­plied as an ionization model or photoelectronic model.
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 hazardous 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, 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.

DH100ACDCA detectors are designed to operate on 24 VDC/
V AC, 120 V AC, or 240 V AC. Alarm and supervisory relay con­tacts are available for control panel interface (alarm initiation),
HVAC control, and other auxiliary functions. Auxiliary relays
are also provided for fan shut down or signaling of up to 9 other
detectors in the loop for multiple fan shut down. These detec-

tors are not designed for 2-wire applications.

D100-68-00 Revision Date: 12-06-99 1 I56-1525-000

For testing, the alarm can be enabled by a magnet activated
test switch or by the optional remote test station. The duct
smoke detector latches into alarm state when an alarm oc­curs. A green LED flashes to indicate power, a red LED
signals local alarm indication, and optional accessories
offer a variety of annunciation capabilities. The
DH100ACDCA can be reset by a momentary power interrup­tion, the reset button on the front cover, the control panel, or
remote reset accessory .

[2] Limitations Of Duct Smoke Detectors

WARNING

The National Fire Protection Association has established
that DUCT DETECTORS MUST NOT BE USED AS A SUB­STITUTE FOR OPEN AREA DETECTOR PROTECTION as
a means of providing life safety. Nor are they a substitute for
early warning in a building’s regular fire detection system.
System Sensor supports this position and strongly recommends
that the user read NFPA Standards 90A, 72, and 101. The
DH100ACDCA Air Duct Smoke Detectors are listed per UL 268A
& CAN/ULC-S529

WARNING

This device will not operate without electrical power.

Fire situations may cause an interruption of power. The sys­tem safeguards should be discussed with your local fire pro­tection specialist.

WARNING

This device will not sense smoke unless the ventilation sys­tem is operating and the cover is installed.

WARNING

For this detector to function properly, it MUST be installed
according to the instructions in this manual. Furthermore,
the detector MUST be protected from the elements and op­erated within ALL electrical and environmental specifica­tions listed in this manual. Failure to comply with these
requirements may prevent the detector from activating when
smoke is present in the air duct.

[4] Contents Of The Duct Smoke Detector Kit

1. Complete housing base and cover assembly

2. T wo #10 machine screws for mounting

3. T wo sampling tube filters

4. One test magnet

5. Drilling template

6. T wo foam gaskets

7. Four #6-self tapping mounting screws for the metal sam-

pling tube and optional exhaust tube extension

8. T wo jack nuts

[3] Figure 1: Exploded View Of Duct Smoke Detector Components

FOAM

GASKETS

CONDUIT HOLES

PLASTIC

SAMPLING TUBE

PLASTIC SAMPLING TUBE

SELF-TAPPING SCREW

DETECTOR BOARD

SAMPLING TUBE

FILTERS

DETECTOR

COVER

COVER MOUNTING

SCREWS

9. One inlet tube end plug

10.One telescoping sampling tube

11. One #8 self-tapping screw for the telescoping sampling

tube

NOTE: For ducts over 11/2 feet, longer inlet sampling tubes

must be ordered to complete the installation. They
must be the correct length for the width of the duct
where they will be installed. See Table 1 on page 3
to determine the inlet tube required for different duct
widths.

DETECTOR

HOUSING

TERMINAL STRIP

POWER BOARD

Tube Installation Chart:

Supplemental Duct
Tube Holes Width

5 12”-14”
6 14”-16”
7 16”-18”

the supplemental tube matches the number as deter­mined in step 2. Secure with the #8 self-tapping screw
into the bottom of the permanent tube.

NOTE: For ducts greater than 11/2 feet in width, refer to sec-

tions [5.4.1] and [5.4.2].

Figure 2. Sampling tube connected to duct smoke
detector:

[5] Installation Sequence
[5.1] Verify Duct Air Flow Direction And Velocity

Model DH100ACDCA detectors are designed to be used in
air handling systems having air velocities of 500 to 4000 feet
per minute. Be sure to check engineering specifications to
ensure that the air velocity in the duct falls within these pa­rameters. If necessary , use a velocity meter to check the air
velocity in the duct.

[5.2] Drill The Mounting Holes

Remove the paper backing from the mounting template sup­plied. Affix the template to the duct at the desired mounting
location. Make sure the template lies flat and smooth on the
duct. Center punch holes A and B. Drill the holes as indicat­ed on the template. Insert the two jack nut receptacles.
Drive a #10 machine screw into jacket to flare the retainer,
then back out the screw to use for detector mounting.

[5.2.1] Sampling Tube Installation for Ducts Less
Than 11/2 Feet Wide (see Figure 2)

1. Remove the front cover.

2. Use the tube installation chart above to determine the set

screw setting.

3. Slide the sampling tube into the housing bushing.

4. Align the holes in the bushing with the holes in the sam-

pling tube. Make sure the number of exposed holes on

[5.3] Secure The Detector Housing To The Duct

Slide the foam gaskets over the tube bushings as shown in
Figure 3. Use the two machine screws to screw the detector
housing to the duct. CAUTION: Do not overtighten the
screws.

Figure 3. Installation of foam gaskets over sampling
tube bushings:

SCREW HOLES FOR
ATTACHING HOUSING
TO DUCT WORK.

D100-68-00 2 I56-1525-000

INLET
TUBE
END
PLUG

AIR HOLES

ARROWS

MUST FACE

INTO AIR FLOW

AIR FLOW DIRECTION

FLANGE

AIR FLOW

DIRECTION

DETECTOR

HOUSING

DOTS INDICATE POSITION OF

SAMPLING TUBE HOLES

AIR FLOW

DIRECTION

DETECTOR

HOUSING

INLET
TUBE

EXHAUST

TUBE

AIR FLOW

DIRECTION

EXHAUST

TUBE

INLET
TUBE

INLET
TUBE

EXHAUST

TUBE

DETECTOR

HOUSING

AIR FLOW

DIRECTION

EXHAUST

TUBE

INLET
TUBE

DETECTOR

HOUSING

A.

B.

C.

D.

NOTE: Orientations C and D apply ONLY to metal sampling tubes.

HORIZONTAL MOUNTING OF HOUSING

VERTICAL MOUNTING OF HOUSING

WARNING

A78-2045-00

[5.4] Sampling Tube Installation for Ducts Greater
Than 11/2 Feet Wide

The sampling tube is identified by a series of air inlet holes
on the tube. A telescoping tube is included for ducts up to
18” in width. All other lengths must be purchased sepa­rately . Order the correct length, as specified in Table 1, for
width of the duct where it will be installed. The exhaust tube
is molded onto the base of the duct housing, and the A2440­00 Exhaust Tube Extension is available as an accessory in
those cases where the molded exhaust port does not ex­tend at least 2 inches into the duct.

The inlet tube is always installed with the air inlet holes fac­ing into the air flow. To assist proper installation, the tube’s
mounting flange is marked with arrows. Make sure the inlet
tube is mounted so that the arrows point into the air flow
(see Figure 4). Figure 5 shows the various combinations of
tube mounting configurations with respect to air flow. Mount­ing the detector housing in a vertical orientation is accept­able, provided that the air flows directly into the sampling
tube holes as indicated in Figure 4.

Table 1. Inlet tubes required for different duct
widths:

Outside Duct Width Inlet Tube Required

1 to 2 ft. ST-1.5
2 to 4 ft. ST-3
4 to 8 ft. ST-5

8 to 12 ft. ST-10

[5.4.1] Installation For Ducts Greater Than 11/2

Feet But Less Than 8 Feet Wide

Figure 4. Air duct detector inlet sampling tube:

A78-2047-00

Figure 5. Tube mounting configurations with
varying air flow direction:

In no case should more than 2 air inlet holes be cut off the
tube. There must be a minimum of 10 holes in the tube ex­posed to the air stream.

1.

If the tube is longer than the width of the air duct,

hole in the duct opposite the hole already cut for the inlet
tube. Make sure the hole is 1” to 2” below the inlet hole on
the opposite side of the duct to allow moisture drainage
away from the detector.

of the air duct,

install the end plug into the inlet tube as

If the tube is shorter than the width

shown in Figure 4. Sampling tubes over 3 ft. long must be
supported at the end opposite the duct detector.

2. Slide the tube into the housing bushing that meets the air

flow first. Position the tube so that the arrows point into
the air flow.

3. Secure the tube flange to the housing bushing with two

#6 self-tapping screws.

4. For tubes longer than the width of the air duct, the tube

should extend out of the opposite side of the duct. If there
are more than 2 holes in the section of the tube extending
out of the duct, select a different length using Table 1.
Otherwise, trim the end of the tube protruding through the
duct so that 1” t o 2 ” of the tube extend outside the duct.
Plug this end with the end plug and tape closed any holes
in the protruding section of the tube. Be sure to seal the

duct where the tube protrudes.

D100-68-00 3 I56-1525-000

drill a 3/4”

[5.4.2] Installation For Ducts More Than 8
Feet Wide

NOTE: To install inlet tubes in ducts more than 8 feet wide,

work must be performed inside the air duct. Sampling of
air in ducts wider than 8 feet is accomplished by using
the ST-10 inlet sampling tube. If the tube is shorter than
the width of the air duct, install the end plug into the inlet
tube as shown in Figure 4 and support the end opposite
the duct smoke detector.

Install the inlet tube as follows:

1. Drill a 3/4” inch hole in the duct directly opposite the hole

already drilled for the inlet tube. Make sure the hole is 1 t o
2”below the inlet hole on the opposite side of the duct to
allow for moisture drainage.

2. Slide the inlet tube with the flange into the housing bush­ing that meets the air flow first. Position the tube so that
the arrows point into the air flow. Secure the tube flange
to the housing bushing with two #6 self-tapping screws.

3. From inside the duct, couple the other sections of the in­let tube to the section already installed using the 1/2-inch
conduit fittings supplied. Make sure that the holes on
both of the air inlet tubes are lined up and facing into the