Greystone DH100ACDCPA Instruction Manual

D100-68-00 Revision Date: 12-06-99 1 I56-1525-000
DH100ACDCIA & DH100ACDCPA
Air Duct Smoke Detector
INSTALLATION AND MAINTENANCE
Before Installing
ULCstandardCAN/ULC-S524-M91“StandardForTheInstalla-
tionOfFire Alarm Systems” should bereferencedfor Canadian
Installations information. For additional reference the System
Sensor Guide for Proper Use of Smoke Detectors in Duct Ap-
plications (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.
IMPORTANT: This detector must be tested and maintained
regularly following CAN/ULC-S536-97 requirements. The
detector should be cleaned at least once a year.
Table 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] DuctSmoke Detector Maintenance andTestProcedures5
[7] Detector Cleaning Procedures 7
[8] Board Replacement 8
[9] Specifications 8
[10] Warranty 8
[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 DH100ACDCA Air Duct Smoke Detectors are sup-
plied 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 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, 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/
VAC, 120 VAC, or 240 VAC. Alarm and supervisory relay con-
tacts are available for control panel interface (alarm initiation),
HVAC control, and other auxiliary functions. Auxiliary relays
arealso provided forfan shut down orsignaling of upto 9 other
detectors in the loop for multiple fan shut down. These detec-
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 oc-
curs. 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 interrup-
tion, 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 SUB-
STITUTE 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
DH100ACDCAAirDuctSmokeDetectorsarelistedperUL268A
&CAN/ULC-S529
WARNING
This device will not operate without electrical power.
Fire situations may cause an interruption of power. The sys-
tem safeguards should be discussed with your local fire pro-
tection specialist.
WARNING
This device will not sense smoke unless the ventilation sys-
tem 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 op-
erated within ALL electrical and environmental specifica-
tions 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. Two #10 machine screws for mounting
3. Two sampling tube filters
4. One test magnet
5. Drilling template
6. Two foam gaskets
7. Four #6-self tapping mounting screws for the metal sam-
pling tube and optional exhaust tube extension
8. Two jack nuts
150 English Drive, Moncton, NB, E1E 4G7 CANADA
tel: [phone] fax: [phone]
e-mail: [email protected]
www.greystoneenergy.com
tors are not designed for 2-wire applications.

the supplemental tube matches the number as deter-
mined in step 2. Secure with the #8 self-tapping screw
into the bottom of the permanent tube.
NOTE: For ducts greater than 11/2feet in width, refer to sec-
tions [5.4.1] and [5.4.2].
Figure 2. Sampling tube connected to duct smoke
detector:
[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.
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 11/2feet, 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.
[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 pa-
rameters. 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 sup-
plied. 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 indicat-
ed 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 11/2Feet 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
D100-68-00 2 I56-1525-000
FOAM
GASKETS
PLASTIC
SAMPLING TUBE
CONDUIT HOLES DETECTOR
HOUSING
TERMINAL STRIP
DETECTOR
COVER
SAMPLING TUBE
FILTERS
COVER MOUNTING
SCREWS
PLASTIC SAMPLING TUBE
SELF-TAPPING SCREW POWER BOARD
DETECTOR BOARD
Tube Installation Chart:
Supplemental Duct
Tube Holes Width
5 12”-14”
6 14”-16”
7 16”-18”
[3] Figure 1: Exploded View Of Duct Smoke Detector Components

INLET
TUBE
END
PLUG
AIR HOLES
ARROWS
MUST FACE
INTO AIR FLOW
AIR FLOW DIRECTION
FLANGE
Figure 4. Air duct detector inlet sampling tube:
A78-2047-00
Figure 5. Tube mounting configurations with
varying air flow direction:
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
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 ex-
posed to the air stream.
[5.4.2] Installation For Ducts More Than 8
Feet Wide
NOTE: To install inlet tubes in ducts more than 8 feet wide,
workmust beperformedinsidethe air duct.Samplingof
air in ducts wider than 8 feet is accomplished by using
theST-10 inlet sampling tube. If the tube is shorter than
thewidth of the air duct, install the end plug intotheinlet
tubeas shown inFigure4and support the endopposite
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 1to
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 bush-
ing 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 in-
let 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
A78-2045-00
[5.4] Sampling Tube Installation for Ducts Greater
Than 11/2Feet 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 sepa-
rately. 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 A2440-
00 Exhaust Tube Extension is available as an accessory in
those cases where the molded exhaust port does not ex-
tend at least 2 inches into the duct.
The inlet tube is always installed with the air inlet holes fac-
ing 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. Mount-
ing the detector housing in a vertical orientation is accept-
able, 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
1. If the tube is longer than the width of the air duct, drill a 3/4”
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. 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. 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”to 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

air flow.
4. Trim the end of the tube protruding through the duct so
that 1to2” 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
when the tube protrudes.
NOTE: An alternate method to using the ST-10 is to use
two ST-5 inlet tubes. Remove the flange from one of
the tubes and install as described above. After the
installation, use electrical tape to close off some of
the sampling holes so that there are a total of 10 to
12 holes spaced as evenly as possible across the
width of the duct.
NOTE: Air currents inside the duct may cause excessive
vibration, especially when the longer sampling
tubes are used. In these cases a 3 inch floor flange
(available at most plumbing supply stores) may be
used to fasten the sampling tube to the other side of
the duct. When using the flange/connector mount-
ing technique, drill a 1-inch to 11/4-inch hole where
the flange will be used.
[5.4.3] Modifications of Inlet Sampling Tubes
There may be applications where duct widths are not what is
specified for the installation. In such cases, it is permissible
to modify an inlet sampling tube that is longer than neces-
sary to span the duct width. Usea0.193-inch diameter (#11)
drill and add the appropriate number of holes so that the total
number of holes exposed to the air flow in the duct is 10 to 12.
Space the additional holes as evenly as possible over the
length of the tube.
NOTE: This procedure should only be used as a temporary
fix. It is not intended as a permanent substitute for
ordering the correct length tubes.
[5.5] Install The Filters
To install the sampling tube filters, simply push the filters
into the sampling and exhaust tube holes, as shown in Fig-
ure 6. If a metal sampling tube is used, install the filters over
the tube ends.
Figure 6. Sampling tube filter installation:
CAUTION
Filters require periodic cleaning or replacement, depending
on the amount of dust and dirt accumulated. Visually in-
spect the filters at least quarterly; inspect them more often if
the dust accumulation warrants it. See Section [6] for more
information. Replacement filters can be ordered from Sys-
tem Sensor, 6581 Kitimat Rd. Unit#6, Mississauga,
Ontario, L5N 3T5 (Exhaust tube/intake tube filter P/N F36-
09-00)
[5.6] Field Wiring Wiring Installation Guidelines
All wiring must be installed in compliance with the National
Electrical Code and the local codes having jurisdiction.
Proper wire gauges should be used. The conductors used to
connect smoke detectors to control panels and accessory
devices should be color-coded to prevent wiring mistakes.
Improper connections can prevent a system from respond-
ing properly in the event of a fire.
For signal wiring, (the wiring between interconnected detec-
tors or from detectors to auxiliary devices), it is usually rec-
ommended that single conductor wire be no smaller than 18
gauge. The duct smoke detector terminals accommodate
wire sizes up to 12 gauge. The last foot of conduit should be
flexible conduit (available in electrical supply houses), which
facilitates easier installation and puts less strain on the con-
duit holes in the housing. Solid conduit connections may be
used if desired.
Smoke detectors and alarm system control panels have
specifications for allowable loop resistance. Consult the
control panel manufacturer’s specifications for the total loop
resistance allowed for the particular model control panel be-
ing used before wiring the detector loop.
Wiring Instructions
The DH100ACDCA detectors are designed for easy wir-
ing. The housing provides a terminal strip with clamping
plates. Wiring connections are made by stripping about
3/8-inch of insulation from the end of the wire, sliding the
bare end under the plate, and tightening the clamping
plate screw.
[5.7] Perform Detector Check
1. Perform STANDBY AND TROUBLE TEST per Section
[6.2.1].
2. Perform MAGNET TEST per Section [6.2.2.1]. The
RTS451 test of Section [6.2.2.2] may substitute for this
requirement.
3. Perform AIR FLOW TEST per Section [6.1.1].
4. Perform SMOKE RESPONSE TEST per Section [6.1.2].
5. Perform SENSITIVITY TEST per Section [6.2.3].
[5.8] Install The Cover
Install the cover using the four screws that are captured in
the housing cover. Be certain filters are installed as speci-
fied in Section [5.5]. Make sure that the cover fits into the
base groove and that all gaskets are in their proper posi-
tions. Tighten the four screws.
D100-68-00 4 I56-1525-000
A78-2106-01

[6] Duct Smoke Detector Maintenance And Test Pro-
cedures
Test and maintain duct detectors as recommended in NFPA
72. The tests contained in this manual were devised to as-
sist maintenance personnel in verification of proper detector
operation.
Before conducting these tests, notify the proper authorities
that the smoke detection system will be temporarily out of
service. Disable the zone or system under test to prevent
unwanted alarms.
[6.1] Smoke Entry Tests
[6.1.1] Air Flow
To verify sufficient sampling of ducted air, use a manometer to
measure the differential pressure created from air flow across
thesamplingtubes. The pressure shouldmeasureno less than
0.03 inches of water and no greater than 1.4 inches of water.
The air handler must be operating for this test.
[6.1.2] Smoke Response
To determine if smoke is capable of entering the sensing
chamber, visually identify any obstructions. Plug the ex-
haust and inlet tube holes to prevent ducted air from carrying
smoke away from the detector head, then blow smoke such
as cigarette, cotton wick, or punk directly at the head to
cause an alarm. REMEMBER TO REMOVE THE PLUGS
AFTER THIS TEST, OR THE DETECTOR WILL NOT FUNC-
TION PROPERLY.
[6.1.3] Filter Replacement
The filters do not substantially affect smoke performance
even when up to 90% of the filter is clogged. Quarterly visual
inspection usually suffices to determine whether the filters
should be replaced because only a high percentage of con-
tamination affects performance. If further testing is required,
compare differential pressure readings with and without the
filters installed. If the difference exceeds 10% replace the fil-
ters. In no case should the pressure differential fall below
0.03 inches of water.
[6.2] Standby, Alarm, And Sensitivity Tests
[6.2.1] Standby And Trouble
Standby — Look for the presence of the flashing green
LED through the transparent housing cover.
The LED should flash approximately every 10
seconds.
Trouble — If the detector LED does not flash, then the
detector lacks power (check wiring, panel, or
power supply), the detector board is missing
(replace), or the unit is defective (return for re-
pair)
Test — The trouble condition can be caused inten-
tionally to verify correct operation of the sys-
tem. Remove the detector board to cause a
trouble condition locally and at the system
control panel.
Cover
Tamper — If the cover is removed for a period longer than
20 minutes, a trouble signal is generated to
indicate the cover is missing.
[6.2.2] Alarm Tests
[6.2.2.1] M02-04-00 Magnet Test
1. Place the painted surface of the magnet onto the TEST
locator on the bottom of the housing (Figure 11).
2. The red alarm LED on the detector should latch on, as
should any accessories (i.e. RA400Z, RTS451). Verify
system control panel alarm status and control panel ex-
ecution of all intended auxiliary functions (i.e. fan shut-
down, damper control, etc.).
3. The detector must be reset by system control panel, front
cover reset button, or remote accessory.
D100-68-00 5 I56-1525-000

D100-68-00 6 I56-1525-000
24V
120
VAC
220/240
VAC
910 A BC
AVAILABLE POWER INPUTS
ALARM AUXILIARY CONTACTS
FOR FAN SHUTDOWN, ETC.
16 6 17 7188
N.C.C.N.O.
N.O.
C.
N.C.
ALARM AUXILIARY CONTACTS SHOWN IN
STANDBY. CONTACTS TRANSFER DURING
ALARM AS INDICATED BY THE ARROWS.
SUPERVISORY TROUBLE CONTACTS
TROUBLECONTACTSCLOSEDIN ALARMANDSTANDBY.
CONTACTSOPENWHILEDETECTORHEADORPOWERIS
REMOVEDORWHENTAMPERFEATURETIMESOUT. OPEN
CONTACTSSIGNALTROUBLECONDITIONTOPANEL.
24V
220/240
VAC
910ABC
AVAILABLE POWER INPUTS
ALARM AUXILIARY CONTACTS
FOR FAN SHUTDOWN, ETC.
16 617 7188
N.C.
C.
N.O.
N.O.
C.N.C.
ALARM AUXILIARY CONTACTS SHOWN IN
STANDBY. CONTACTS TRANSFER DURING
ALARM AS INDICATED BY THE ARROWS.
SUPERVISORY TROUBLE CONTACTS
TROUBLECONTACTSCLOSEDIN ALARMANDSTANDBY.
CONTACTSOPENWHILEDETECTORHEADORPOWERIS
REMOVEDORWHENTAMPERFEATURETIMESOUT. OPEN
CONTACTSSIGNALTROUBLECONDITIONTOPANEL.
314 314
4
5
ALARM
INITIATION
CONTACTS
CONTACTS SHOWN
OPEN IN STANDBY.
CONTACTS CLOSE
IN ALARM.
4
5
ALARM
INITIATION
CONTACTS
CONTACTS SHOWN
OPEN IN STANDBY.
CONTACTS CLOSE
IN ALARM.
ALARM
INITIATION
LOOP
UL LISTED 4-WIRE
CONTROL PANEL FIRST DETECTOR IN THE LOOP
DH100ACDCA LAST DETECTOR IN THE LOOP
DH100ACDCA EOL RESISTOR
SPECIFIED BY
PANEL MANUFACTURER
CONNECT POWER SOURCE
TO APPROPRIATE TERMINALS
OF EACH DETECTOR. SEE
SPECIFICATIONS FOR
ADDITIONAL POWER SUPPLY
INFORMATION.
FOR WIRING OF AUXILIARY
DEVICES, REFER TO
MANUFACTURER’S
INSTALLATION INSTRUCTIONS
OR CONTACT MANUFACTURER.
NOTE: THE SUPERVISORY RELAY NOW
PROVIDES A "FORM C" CONTACT FOR
CUSTOMIZED APPLICATIONS.
FOR STANDARD APPLICATIONS, ONLY
THE "NO" CONTACT IS USED
POWER INPUTS ACCEPT
24 VDC, 24 VAC 50-60 HZ,
120 VAC 50-60 HZ, OR
220/240 VAC 50-60 HZ.
CONNECT POWER SOURCE
TO APPROPRIATE TERMINALS
OF EACH DETECTOR.
AUX. CONTACT RATINGS
10A @ 30 VDC RESISTIVE
10A @ 250 VAC
100mA MINIMUM @ 5 VDC
NOT INTENDED FOR
CONNECTION TO CONTROL
PANELS.
TROUBLE CONTACT RATING
2.0 A @ 30 VDC resistive
+
—
120
VAC
CAUTION
Do not loop wire under terminals when wiring detectors. Break wire runs to provide system supervision of connections.
Figure 8. Wiring diagram for DH100ACDCA to
APA451:
A78-2352-03
Figure 7. System wiring diagram for 4-wire duct smoke detectors (detectors powered from
initiating circuit):
15
19
14
3
20 1
3
2
Alarm Signal
Aux. Power +
Sup. N. O.
Sup. COM
Aux. Power —
NOTE: Wiring diagram shown is for DH100ACDCA 4-wire duct
smoke detector system equipped without a control panel.
Alarm
Power
Common
APA451DH100ACDCA
15
19
14
3
20
2
11
2
6
1
Alarm Signal
Aux. Power +
Sup. N. O.
Sup. COM
Aux. Power —
Reset
Test
(Red LED) Alarm
(Green LED) Power
Common
12
1
12
1
Interconnect +
Interconnect —
DH100ACDCA
DH100ACDCA
RTS451KEY
5
4
3Reset
Common
Test
NOTE: Wiring diagram shown is for
DH100ACDCA 4-wire duct smoke
detector system equipped
without a control panel.
Figure 9. Wiring diagram for DH100ACDCA to
RTS451KEYA and interconnect feature:
Unit Two
IMPORTANT!
ALL INTERCONNECTED
UNITS MUST BE POWERED
BY THE SAME,
INDEPENDENT POWER
SUPPLY.

D100-68-00 7 I56-1525-000
Figure 11. Testing detector alarm:
A78-2325-00
[6.2.2.2] RTS451A/RTS451KEYA Remote Test Station
The RTS451A/RTS451KEYA Remote Test Station facilitates
test of the alarm capability of the duct smoke detector as in-
dicated in the RTS451A/RTS451KEYA manual. The
DH100ACDCA duct smoke detector can be reset by the
RTS451A/RTS451KEYA. If a system control panel is used,
the panel itself may also require testing.
To install the RTS451A/RTS451KEYA, connect the device as
shown in Figure 9; wire runs must be limited to 25 ohms or
less per interconnecting wire.
[6.2.3] Sensitivity Tests
[6.2.3.1] MOD400 or MOD400R Test
After verification of alarm capability, use the MOD400R test
module with a voltmeter to check detector sensitivity as indi-
cated in the test module’s manual. The housing cover must
be removed to perform this test.
If test module readings indicate that the detector head is out-
side of the acceptable range that is printed on the label of the
detector, the detector chamber requires cleaning per Section
[7] of this manual.
[7] Detector Cleaning Procedures
Notify the proper authorities that the smoke detector system is
undergoing maintenance, and that the system will temporarily
be out of service. Disable the zone or system undergoing
maintenance to prevent unwanted alarms and possible dis-
patch of the fire department.
[7.1] Air Filters
1. Turn off power to the system.
2. Remove and inspect sampling tube filters.
3. If filters are heavily coated with dirt, replace them with new
filters. If they are not heavily coated, use a vacuum cleaner
or compressed air nozzle to remove dust, then reinstall the
filters.
[7.2] Photo Detector Boards
1. Remove the screen by gently grasping on each side and
pulling straight off.
2. Lift the photo chamber in the same fashion. Vacuum the
screen and cover. Use clean, compressed air to loosen
and blow out any remaining debris. Replacement screens
(S08-39-01) are available.
3. Vacuum photo chamber, then use clean compressed air to
blow area clean.
4. Replace the chamber by pressing it onto the base. Press
the screen into place. It should fit tightly on the chamber.
[7.3] Ion Detector Boards
1. Brush or vacuum inside area of cover. Chamber may then
be blown out using clean, compressed air.
2. Vacuum sensing chamber before using clean, com-
pressed air to loosen and blow out any remaining debris.
[8.0] Board Replacement
[8.1] Detector Board Replacement
1. Remove the two detector board mounting screws.
2. Pull gently on the board to remove it.
ALARM SIGNAL (+)
AUX POWER (Ð)
15
20
(+)
(Ð)
DUCT DETECTOR
DH100ACDCA PA400 (OPTIONAL) AUDIBLE ALERT
ALARM SIGNAL (+)
AUX POWER (Ð)
15
20
(+)
(Ð)
DUCT DETECTOR
DH100ACDCA RA400ZA (OPTIONAL)
REMOTE (LED)
ANNUNCIATOR
RED
ACCESSORY CURRENT LOADS AT 24 VDC
DEVICE
APA451
PA400
RA400ZA
RTS451/RTS451KEY
STANDBY
12.5mA Max.
0mA
0mA
12mA Max.
ALARM
30mA Max.
15mA Max.
10mA Max.
7.5mA Max.
When a unit is powered at the 120VAC or 220/240VAC input,
any combination of accessories may be used such that the given
accessory loads are:
60mA or less in the standby state,
110mA or less in the alarm state.
Figure 10. Wiring diagrams for optional accessories (see page 6 for APA451 wiring diagram):
A78-2354-05

D100-68-00 8 I56-1525-000
[9] Model DH100ACDCA Air Duct Smoke Detector Specifications
Temperature:
DH100ACDCPA 32° to 131° F 0° to 55° C
DH100ACDCIA 32° to 120° F 0° to 49° C
Humidity: 10% to 93% R.H. noncondensing
Air Velocity: 500 to 4000 ft./min. 2.5 to 20.3 m/sec.
Dimensions: 14.38” L x 5.5” W x 2.75” D 37cm L x 14cm W x 7cm D
Weight: 3.75 pounds 1.7 kg
Electrical Specifications
Power supply voltage: 20-29 VDC 24 VAC 50-60-Hz 120 VAC 50-60 Hz 220/240 VAC 50-60 Hz
Input capacitance: 270
µ F max. 270 µ F max. N/A N/A
Reset voltage: 3.0 VDC min. 2.0 VAC min. 10 VAC min. 20 VAC min.
Reset time (with RTS451): .03 to 0.3 sec. .03 to 0.3 sec. .03 to 0.3 sec. .03 to 0.3 sec.
Reset time (by power down): 0.6 sec. max. 0.6 sec. max. 0.6 sec. max. 0.6 sec. max.
Power up time: 34 sec. max. 34 sec. max. 34 sec. max. 34 sec. max.
Alarm response time: 2 to 17 sec. 2 to 17 sec. 2 to 17 sec. 2 to 17 sec.
Sensitivity Test: See detector label See detector label See detector label See detector label
3. To replace the board, align the board mounting features,
holes, and the interconnect terminals. Push the board
into place.
4. Secure board with the two mounting screws.
[8.2] Power Board replacement
1. Disconnect wiring from the terminal block.
2. Remove the two power board mounting screws.
3. Pull gently on the board to remove it.
4. To replace the board, align the board mounting features,
holes, and the interconnect terminals. Push the board
into place.
5. Secure board with the two mounting screws.
6. Re-connect wiring to terminal block.
Power Supply Voltage 20 - 29 VDC 24 VAC 50 - 60 Hz 120 VAC 50 - 60 Hz 220/240 VAC 50 - 60 Hz
CURRENT REQUIREMENTS (USING NO ACCESSORIES)
Max. standby current 15 mA 35 mA RMS 25 mA RMS* 15 mA RMS*
Max. alarm current 70 mA 125 mA RMS 35 mA RMS* 25 mA RMS*
CONTACT RATINGS
Alarm initiation contacts (SPST) 2.0A @ 30 VDC (resistive)
Alarm auxiliary contacts (DPDT) 10A @ 30 VDC
10A @ 250 VAC
Trouble contacts (SPDT) 2.0A @ 30 VDC (resistive)
Note: Alarm auxiliary contacts must switch 100 mA minimum at 5VDC. Alarm auxiliary contacts shall not be
connected to inititaing circuits of control panels. Use the alarm initiation contact for this purpose.
ACCESSORY CURRENT LOADS AT 24 VDC
DEVICE
APA451
PA400
RA400Z
RTS451/ RTS451KEY
STANDBY
12.5mA Max.
0mA
0mA
12mA
ALARM
30mA Max.
15mA Max.
10mA Max.
7.5mA Max.
* NOTE: When a unit is powered at the 120VAC or 220/240VAC input, any
combination of accessories may be used such that the given accessory loads are:
60 mA or less in the standby state,
110 mA or less in the alarm state.