System Sensor Innovair Dh100Acdcp Users Manual I56 1147 12R

DH100ACDCP to the manual 8c7a453e-0df6-4f89-9923-cea610c2f32e

2015-02-02

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INSTALLATION AND MAINTENANCE INSTRUCTIONS

DH100ACDCP Air Duct Smoke Detector
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 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 detailed
information.
NOTICE: This manual shall 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.

or signaling of up to 9 other detectors in the loop for multiple fan shut down. These detectors are not designed for
2-wire applications.
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 DH100ACDCP can be reset by a momentary power
interruption, the reset button on the front cover, the control
panel, or remote reset accessory. The DH100ACDCP incorporates a cover tamper feature that provides a trouble
signal after 7 minutes if the cover is removed or improperly installed. Proper installation of the cover removes the
trouble condition.

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] Duct Smoke Detector Maintenance and Test Procedures 5
[7] Detector Cleaning Procedures
7
[8] Board Replacement
8
[9] Specifications
8
Warranty
8

[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 DH100ACDCP Air Duct Smoke Detectors are listed per
UL 268A.

[1] General Description
An HVAC 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.

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.

Model DH100ACDCP Air Duct Smoke Detector utilizes
photoelectric technology for the detection of smoke. This
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 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.

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.

The DH100ACDCP detector is designed to operate on
24 VDC/VAC, 120 VAC, or 240 VAC. 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
D100-68-00

A Division of Pittway
3825 Ohio Avenue, St. Charles, Illinois 60174
1-800-SENSOR2, FAX: 630-377-6495

I56-1147-12R

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

CONDUIT HOLES
DETECTOR
HOUSING

PLASTIC
SAMPLING TUBE

TERMINAL STRIP

POWER BOARD

PLASTIC SAMPLING TUBE
SELF-TAPPING SCREW

DETECTOR BOARD
SAMPLING TUBE
FILTERS

DETECTOR
COVER

COVER MOUNTING
SCREWS

[5.2.1] Sampling Tube Installation for Ducts Less
Than 11⁄2 Feet Wide (see Figure 2)
1. Remove the front cover.
2. Slide the plastic sampling tube into the housing bushing.
3. Align the holes in the bushing with the holes in the
sampling tube. Make sure there are 6 exposed holes on
the plastic sampling tube. Secure with the #8 self-tapping
screw into the bottom of the permanent tube (shown in
Fig. 1).
NOTE: For ducts greater than 11⁄2 feet in width, refer to
sections [5.4.1] and [5.4.2].

[4] Contents Of The Duct Smoke Detector Kit
1. Complete housing base and cover assembly
2. Two #10×11⁄4″ sheet metal 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
sampling tube and optional exhaust tube extension
8. One inlet tube end plug
9. One plastic sampling tube
10. One #8 self-tapping screw for the plastic 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.

Figure 2. Plastic sampling tube
connected to duct smoke detector:

[5] Installation Sequence
[5.1] Verify Duct Air Flow Direction And Velocity
Model DH100ACDCP 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.

[5.3] Secure The Detector Housing To The Duct
Slide the foam gaskets over the tube bushings as shown in
Figure 3. Use the two 11⁄4″ long sheet metal screws to screw
the detector housing to the duct.
CAUTION: Do not overtighten the screws.

[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.
D100-68-00

I56-1147-12R

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

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.

SCREW HOLES FOR
ATTACHING HOUSING
TO DUCT WORK.

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 plastic 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 A2440-00
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.

Figure 4. Air duct detector inlet sampling tube:
FLANGE

INLET
TUBE
END
PLUG

ARROWS
MUST FACE
INTO AIR FLOW

AIR FLOW DIRECTION
A78-2047-00

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

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.

DOTS INDICATE POSITION OF
SAMPLING TUBE HOLES

AIR FLOW
DIRECTION

DETECTOR
HOUSING

INLET
TUBE

EXHAUST
TUBE

INLET
TUBE

HORIZONTAL MOUNTING OF HOUSING
EXHAUST
TUBE

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

AIR FLOW
DIRECTION
DETECTOR
HOUSING

EXHAUST
TUBE
INLET INLET
TUBE TUBE
C.

DETECTOR
HOUSING
AIR FLOW
DIRECTION

VERTICAL MOUNTING OF HOUSING

NOTE: Only metal sampling tubes may be used on orientations C and D.
WARNING

[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
smoke 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.
D100-68-00

AIR HOLES

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.
[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.
3

I56-1147-12R

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 to 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 1⁄2inch conduit fittings supplied. Make sure that the holes
on both of the air inlet tubes are lined up and facing into
the air flow.
4. 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
when the tube protrudes.

[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
Figure 6. If a metal sampling tube is used, install the filters
over the tube ends.

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.

Filters require periodic cleaning or replacement, depending on the amount of dust and dirt accumulated. Visually
inspect 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 System Sensor, 3825 Ohio Ave., St. Charles, IL 60174.
(Exhaust tube/intake tube filter P/N F36-09-00)

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
mounting technique, drill a 1-inch to 11⁄4-inch hole
where the flange will be used.

[5.6] Field 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
responding properly in the event of a fire.

[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
necessary to span the duct width.

For signal wiring, (the wiring between interconnected
detectors or from detectors to auxiliary devices), it is usually recommended 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 conduit 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 being used before wiring the detector loop.

Figure 6. Sampling tube filter installation:

A78-2106-01

CAUTION

Use a 0.193-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.

Wiring Instructions
The DH100ACDCP detectors are designed for easy wiring.
The housing provides a terminal strip with clamping plates.
D100-68-00

I56-1147-12R

[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 contamination affects performance. If further testing is
required, compare differential pressure readings with and
without the filters installed. If the difference exceeds 10%
replace the filters. In no case should the pressure differential fall below 0.03 inches of water.

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].

[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.

[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 specified in Section [5.5]. Make sure that the cover fits into the
base groove and that all gaskets are in their proper positions. Tighten the four screws.

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), the cover has been missing or not secured properly for more than 7 minutes (se
cure cover properly), or the unit is defective
(return for repair).

[6] Duct Smoke Detector Maintenance And Test
Procedures
Test and maintain duct smoke detectors as recommended
in NFPA 72. The tests contained in this manual were
devised to assist maintenance personnel in verification of
proper detector operation.

Test —

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.

Cover
Tamper — If the cover is removed or not properly secured
for a period longer than 7 minutes, a trouble
signal is generated to indicate the cover is missing.

[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 the sampling tubes. The pressure should measure no
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.

[6.2.2] 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 13).
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
execution of all intended auxiliary functions (i.e. fan
shutdown, damper control, etc.).
3. The detector must be reset by system control panel, front
cover reset button, or remote accessory.

[6.1.2] Smoke Response
To determine if smoke is capable of entering the sensing chamber, visually identify any obstructions. Plug the
exhaust 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
FUNCTION PROPERLY.

D100-68-00

The trouble condition can be caused intention
ally to verify correct operation of the system.
Remove the detector board to cause a trouble
condition locally and at the system control
panel.

I56-1147-12R

Figure 7. System wiring diagram for 4-wire duct smoke detectors:
CAUTION

Do not loop wire under terminals when wiring detectors. Break wire runs to provide system supervision of connections.
AVAILABLE POWER INPUTS

AVAILABLE POWER INPUTS
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.

120
VAC

24V

120
VAC

24V

220/240
VAC

220/240
VAC
ALARM AUXILIARY CONTACTS
FOR FAN SHUTDOWN, ETC.
18
7
17
6
16

AUX. CONTACT RATINGS
10A @ 30 VDC RESISTIVE
10A @ 250 VAC
100mA MINIMUM @ 5 VDC
NOT INTENDED FOR
CONNECTION TO CONTROL
PANELS.

ALARM AUXILIARY CONTACTS
FOR FAN SHUTDOWN, ETC.
6

N.C.

N.O.

N.C.

CONNECT POWER SOURCE
TO APPROPRIATE TERMINALS
OF EACH DETECTOR. SEE
SPECIFICATIONS FOR
ADDITIONAL POWER SUPPLY
INFORMATION.

N.O.

8
N.C.

ALARM AUXILIARY CONTACTS SHOWN IN
STANDBY. CONTACTS TRANSFER DURING
ALARM AS INDICATED BY THE ARROWS.

SUPERVISORY TROUBLE CONTACTS

TROUBLE CONTACT RATING
2.0 A @ 30 VDC resistive
2.0 A @ 125 VAC resistive

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

TROUBLE CONTACTS CLOSED IN ALARM AND STANDBY.
CONTACTS OPEN WHILE DETECTOR PCB OR POWER IS
REMOVED OR WHEN TAMPER FEATURE TIMES OUT. OPEN
CONTACTS SIGNAL TROUBLE CONDITION TO PANEL.

+
5

5
CONTACTS SHOWN
OPEN IN STANDBY.
CONTACTS CLOSE
IN ALARM.

ALARM
INITIATION
CONTACTS

CONTACTS SHOWN
OPEN IN STANDBY.
CONTACTS CLOSE
IN ALARM.

ALARM
INITIATION
CONTACTS

ALARM
INITIATION
LOOP

–
EOL RESISTOR
SPECIFIED BY
PANEL MANUFACTURER

LAST DETECTOR IN THE LOOP
DH100ACDCP

FIRST DETECTOR IN THE LOOP
DH100ACDCP

UL LISTED 4-WIRE
CONTROL PANEL

A78-2352-27

Figure 8. Wiring diagram for DH100ACDCP to APA451:

Figure 9. Wiring diagram for DH100ACDCP to
RTS451KEY and interconnect feature:

4-Wire Wiring to APA451
����������

DH100ACDCP
15

Aux. Power +

������

� �����
���������

RTS451/RTS451KEY

Alarm Signal

������������

��

������������

��

Sup. N. O.

����������

��

Sup. COM

��������

�

� �����
�����������

��

� ������

������������

Aux. Power –
Reset

(Red LED) Alarm
RTS451KEY
*For
only without a

control panel.

(Green LED)
Power

Test

������ �������������������������������������������������
�
�������������������������������������������������������

Figure 10. Multiple fan shutdown (interconnect):
1
–
1

6
12

DETECTOR 1

C
NEXT
DETECTOR

DETECTOR 2

DETECTOR 3

+
12

FAN
CONTROL

D100-68-00

SYSTEM
CONTROL
POWER OR
THERMOSTAT

FAN
CONTROL

SYSTEM
CONTROL
POWER OR
THERMOSTAT

FAN
CONTROL

SYSTEM
CONTROL
POWER OR
THERMOSTAT

Important Interconnect Notes
• When using the interconnect feature, all interconnected units must be powered with
the same, independent supply.
• Polarity must be maintained throughout the
interconnect wiring. Connect terminal 12 on
unit 1 to terminal 12 on unit 2 and so on.
Similarly, connect terminal 1 on unit 1 to terminal 1 on unit 2 and so on.
I56-1147-12R

Figure 11. Wiring diagrams for optional accessories:
(+)

15
ALARM SIGNAL (+)

(+)

(—)

Figure 12. Wiring diagram for
DH100ACDCP to SSK451:
FIELD INSTALLED
JUMPER FOR
TEMPORAL PATTERN

ALARM SIGNAL (+)

AUX POWER (—)

RED

AUX POWER (—)

DUCT DETECTOR
DH100ACDC

(—)

PA400 (OPTIONAL)
AUDIBLE ALERT

DUCT DETECTOR
DH100ACDC

RA400Z (OPTIONAL)
REMOTE (LED)
ANNUNCIATOR

A78-2354-07
ACCESSORY CURRENT LOADS AT 24 VDC
DEVICE

STANDBY

TROUBLE

ALARM

APA451

12.5mA Max.

n/a

30mA Max.

PA400

0mA

n/a

15mA Max.

RA400Z

0mA

n/a

10mA Max.

RTS451/RTS451KEY

12mA*

n/a

7.5mA Max.

SSK451

5mA Max.

9mA Max.

30mA Max.

COMMON

TEMPORAL SELECT

ALARM SIGNAL

SUPERVISORY SIGNAL

3
14

ALARM SIGNAL

SUPERVISORY
CONTACT

RESET

TEST

POWER (-)

AUX. POWER (-)

POWER (+)

AUX. POWER (+)

SSK451

DH100ACDC
FIELD INSTALLED
JUMPER

*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.

[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
indicated in the test module’s manual. The housing cover
must be removed to perform this test.

Figure 13. Testing detector alarm:

If test module readings indicate that the detector head is
outside 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 dispatch of the fire department.

A78-2325-00

[6.2.2.2] RTS451/RTS451KEY Remote Test Station
The RTS451/RTS451KEY Remote Test Station facilitates
test of the alarm capability of the duct smoke detector as indicated in the RTS451/RTS451KEY manual. The
DH100ACDCP duct smoke detector can be reset by the
RTS451/RTS451KEY. If a system control panel is used, the
panel itself may also require testing.
To install the RTS451/RTS451KEY, connect the device as
shown in Figure 9; wire runs must be limited to 25 ohms
or less per interconnecting wire.
Please note that the magnetic coil supplied with the
RTS451 and RTS451KEY is not required when these
accessories are used with the DH100ACDCP detectors.
The functionality of the magnetic coil has been designed
into the circuitry of the new Innovair™ duct smoke detectors.
[6.2.2.3] SSK451 Multi-Signaling Accessory
The System Sensor SSK451 Multi-Signaling accessory
combines a sounder feature with a key activated test and
reset function. green, amber and red LEDs provide a visual
indication of power, trouble, and alarm respectively. An
optional strobe (PS24LO) with a smoke lens can be added
to conform to the codes of certain jurisdictions.
To install the SSK451, connect the device as shown in figure 12.
D100-68-00

[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

I56-1147-12R

[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, compressed
air to loosen and blow out any remaining debris.
[8.0] Board Replacement
[8.1] Detector Board Replacement (Part No. A5190)
1. Remove the two detector board mounting screws.
2. Pull gently on the board to remove it.
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 (Part No. A5064)
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.

[9] Model DH100ACDCP Air Duct Smoke Detector Specifications
Temperature:
DH100ACDCP
32° to 131° F
Storage Temperature:
–22° to 150° F
Humidity:
10% to 93% R.H. noncondensing
Air Velocity:
500 to 4000 ft./min.
Dimensions:
14.38″ L x 5.5″ W x 2.75″ D
Weight:
3.75 pounds
Electrical Specifications
Power supply voltage:
20-29 VDC
24 VAC 50-60-Hz
Input capacitance:
270 µF max.
270 µF max.
Reset voltage:
3.0 VDC min.
2.0 VAC min.
Reset time (with RTS451):
.03 to 0.3 sec.
.03 to 0.3 sec.
Reset time (by power down):
0.6 sec. max.
0.6 sec. max.
Power up time:
34 sec. max.
34 sec. max.
Alarm response time:
2 to 17 sec.
2 to 17 sec.
Sensitivity Test:
See detector label See detector label
Power Supply Voltage

20 - 29 VDC

0° to 55° C
–30° to 70° C
2.5 to 20.3 m/sec.
37cm L x 14cm W x 7cm D
1.7 kg
120 VAC 50-60 Hz
N/A
10 VAC min.
.03 to 0.3 sec.
0.6 sec. max.
34 sec. max.
2 to 17 sec.
See detector label

220/240 VAC 50-60 Hz
N/A
20 VAC min.
.03 to 0.3 sec.
0.6 sec. max.
34 sec. max.
2 to 17 sec.
See detector label

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)

ACCESSORY CURRENT LOADS AT 24 VDC

2.0A @ 30 VDC (resistive)

Alarm auxiliary contacts (DPDT)

10A @ 30 VDC
10A @ 250 VAC
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.
Trouble contacts (SPDT)

2.0A @ 30 VDC (resistive)
2.0A @ 125 VAC (resistive)

DEVICE

STANDBY

TROUBLE

ALARM

APA451

12.5mA Max.

n/a

30mA Max.

PA400

0mA

n/a

15mA Max.

RA400Z

0mA

n/a

10mA Max.

RTS451

0mA

n/a

7.5mA Max.

RTS451KEY

12mA*

n/a

7.5mA Max.

SSK451

5mA Max.

9mA Max.

30mA 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.

Please refer to insert for the Limitations of Fire Alarm Systems
Three-Year Limited Warranty
System Sensor warrants its enclosed air duct smoke detector to be free
Avenue, St. Charles, IL 60174. Please include a note describing the malfrom defects in materials and workmanship under normal use and serfunction and suspected cause of failure. The Company shall not be oblivice for a period of three years from date of manufacture. System Sensor
gated to repair or replace units which are found to be defective because
makes no other express warranty for this air duct smoke detector. No
of damage, unreasonable use, modifications, or alterations occurring
agent, representative, dealer, or employee of the Company has the authorafter the date of manufacture. In no case shall the Company be liable for
ity to increase or alter the obligations or limitations of this Warranty. The
any consequential or incidental damages for breach of this or any other
Company’s obligation of this Warranty shall be limited to the repair or
Warranty, expressed or implied whatsoever, even if the loss or damage is
replacement of any part of the air duct smoke detector which is found to
caused by the Company’s negligence or fault. Some states do not allow
be defective in materials or workmanship under normal use and service
the exclusion or limitation of incidental or consequential damages, so the
during the three year period commencing with the date of manufacture.
above limitation or exclusion may not apply to you. This Warranty gives
After phoning System Sensor’s toll free number 800-SENSOR2 (736-7672)
you specific legal rights, and you may also have other rights which vary
for a Return Authorization number, send defective units postage prepaid
from state to state.
to: System Sensor, Returns Department, RA #__________, 3825 Ohio
D100-68-00

I56-1147-12R

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