System Sensor Innovair flex D4120A User manual

1 I56-3102-003
7/8/2019
D4120A Duct Smoke Detector
D4SA Sensor Component
D4P120A Power Board Component
INSTALLATION AND MAINTENANCE INSTRUCTIONS
3333 Unity Drive, Mississauga, ON L5L 3S6
1-800-SENSOR2, FAX: [phone]
www.systemsensor.ca
TABLE OF CONTENTS PAGE
[1] Limitations of Duct Smoke Detectors 1
[2] Exploded View of Duct Smoke Detector Components 2
[3] General Description 2
[4] Contents of Duct Smoke Detector Kit 2
[5] Detector Installation 2
[6] Sampling Tube Installation 3
[7] Measurement Tests 3
[8] Field Wiring Installation Guidelines 4
[9] Unit Configuration 5
[10] Detector Status Indication 6
[11] Interconnection (Multiple Fan Shut Down) 6
[12] Verification of Operation 6
[13] Detector Cleaning Procedures 7
[14] Sensor replacement 7
[15] Optional Accessories 7
Wiring Diagrams 5-7
Warranty 8
BEFORE INSTALLING
Read the System Sensor Guide for Proper Use of Smoke Detectors in Duct
Applications (HVAG53), which provides information on detector spacing,
placement, zoning, wiring, and special applications. This manual is available
online at www.systemsensor.ca. CAN/ULC S524 should also be referenced
for detailed information.
NOTICE: This manual shall be left with the owner/user of this equipment.
NOTE: The D4120A duct detector consists of D4P120A Power Board component and the D4SA Sensor component.
SPECIFICATIONS
Operating Temperature: D4120A & D4SA: –4° to 158° F (–20° to 70° C) D4P120A: –40° to 158° F (–40° to 70° C)
Storage Temperature: D4120A & D4SA: –22° to 158° F (–30° to 70° C) D4P120A: –40° to 158° F (–40° to 70° C)
Humidity: 0% to 95% Relative Humidity Non-condensing
Air Velocity: 100 to 4000 ft./min. (0.5 to 20.3 m/sec.)
D4120A Footprint Dimensions: Rectangular - 14.38 in L x 5 in W x 2.5 in D (37cm L x 12.7cm W x 6.36cm D)
Square - 7.75 in L x 9 in W x 2.5 in D (19.7cm L x 22.9cm W x 6.35cm D)
D4SA/D4P120A Footprint Dimensions: 7.75 in L x 5 in W x 2.5 in D (19.7cm L x 12.7cm W x 6.35cm D)
D4120A Weight: 2.5 pounds; 1.14 kg
Electrical
Power supply voltage: 20-29 VDC 24 VAC 50-60-Hz 120 VAC 50-60 Hz
Input capacitance: 270 µF max. 270 µF max. N/A
Reset Voltage: 3.0 VDC min. 2.0 VAC min. 10 VAC min.
Reset Time (with RTS451): .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.
Power Up Time: 35 sec. max. 35 sec. max. 35 sec. max.
Alarm response time: 15 sec. 15 sec. 15 sec.
Sensitivity Test: See detector label See detector label See detector label
Current Requirements (Using No Accessories)
Standby current 21 mA @ 24 VDC 65 mA RMS @ 24VAC 60Hz 20 mA RMS @ 120 VAC 60 Hz
Alarm current 65 mA @ 24 VDC 135 mA RMS @ 24 VAC 60 Hz 35 mA RMS @ 120 VAC 60 Hz
CONTACT RATINGS
Alarm initiation contacts
(SPST)
2.0A @ 30 VDC (resistive)
Alarm auxiliary contatcs
(DPDT)
10A @30 VDC (resistive)
10A @250 VAC (resistive)
1/2HP @240 VAC
1/4HP @120 VAC
NOTE: Alarm auxiliary contacts shall not be connected to initiating
circuits of control panels. Use the alarm initiation contact for this
purpose.
Supervisory Contacts
(SPDT)
2.0A @ 30 VDC (resistive)
2.0A @ 125 VAC (resistive)
ACCESSORY CURRENT LOADS AT 24 VDC
DEVICE STANDBY TROUBLE ALARM
MHRA/MHWA 0mA n/a 29mA Max.
RA400ZA 0mA n/a 12mA Max.
RTS451 0mA n/a 12mA Max.
RTS451KEYA 12mA n/a 12mA Max.
NOTE: Any combination of accessories may be used such that the given
accessory loads are: 110mA or less at the Aux output, and 50mA or less at
the Alarm output.
IMPORTANT: This detector must be tested and maintained regularly follow-
ing CAN/ULC S536 requirements. The detector should be cleaned at least
once a year.
[1] LIMITATIONS OF DUCT SMOKE DETECTORS
WARNING
The National Fire Protection Association has established that DUCT DETEC-
TORS MUST NOT BE USED AS A SUBSTITUTE FOR OPEN AREA DE-
TECTOR 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, 101and CAN/ULC S524. The D4120A Air
Duct Smoke Detectors are listed per ULC.
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.
This device will not sense smoke unless the ventilation system is operating
and the cover is installed.
For this detector to function properly, it MUST be installed according to the in-
structions in this manual. Furthermore, the detector MUST be 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.
I56-3102-003

SENSOR MODULE
COVER
POWER BOARD MODULE COVER
SENSOR HEAD
METAL
SAMPLING TUBE
POWER BOARD
EXHAUST TUBE
4-WIRE
MAGNET TEST LOCATION
(sold seperately)
[3] GENERAL DESCRIPTION
Smoke introduced into an air duct system will be distributed throughout the
entire building. Smoke detectors designed for use in air duct systems are
used to sense the presence of smoke in the duct.
Model D4120A and D4SA Duct Smoke Detectors utilize 4-wire photoelectric
technology for the detection of smoke. This detection method, when com-
bined with an efficient housing, samples air passing through the duct allow-
ing detection of a developing hazardous condition. When sufficient smoke is
sensed, an alarm signal is initiated 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.
The D4120A and D4P120A detectors are designed to operate on 24 VDC/
VAC or 120 VAC. Alarm and supervisory relay contacts are available for
control panel interface, HVAC control, and other auxiliary functions. Auxiliary
relays are provided for fan shut down. Detector interconnection provides sig-
naling of up to 50 other detectors in the loop for multiple fan shut down. These
detectors are not designed for 2-wire applications. If units are powered by AC
power and monitored by a ULC listed FACP, the fire alarm zone needs to be
programmed as a monitor zone.
[3.1] DETECTOR FEATURE SET
-Utilizes 2D51A plug-in head
-2 sensors to 1 power board capability
-Cover missing signal
-Sampling tubes install from front or rear of detector
-Compatible with existing accessories
[4] CONTENTS OF THE DUCT SMOKE DETECTOR KIT
1. Sensor/power board assembly and cover(s)
2. Three #10 sheet metal screws for mounting
3. Drilling template
4. One sampling tube end cap
5. One plastic exhaust tube
NOTE: A sampling tube must be ordered to complete the installation. It must
be the correct length for the width of the duct where it will be installed. See
Table 1 on page 3 to determine the inlet tube required for different duct widths.
[5] DETECTOR INSTALLATION
[5.1] VERIFY AIR FLOW DIRECTION AND VELOCITY
Model D4120A detectors are designed to be used in air handling systems
with air velocities of 100 to 4000 feet per minute. Duct widths from 6 inches
to 12 feet can be accommodated. Be sure to check engineering specifica-
tions to ensure that the air velocity in the duct falls within these parameters.
If necessary, use a velocity meter (anemometer) to check the air velocity in
the duct.
[5.2] DETERMINE MOUNTING LOCATION AND CONFIGURATION
On ducts wider than 18 inches it is recommended that the detector be
mounted downstream of a bend, obstruction in the duct, or the supply or re-
turn air inlet.
Exception: Installation of duct detectors can be on or within a commercial
packaged rooftop heating and air-conditioning system, fire/smoke dampers
and economizers. They may be mounted in either the supply and/or return air
section as determined by local code.
Once a suitable location is selected, determine if the detector is to be
mounted in a side-by-side “rectangular” configuration or a top-over-bottom
“square” configuration as shown in Figure 2. If mounting in the square con-
figuration, remove the rear attachment screw, rotate the unit at the hinge, and
replace the screw into the new attachment hole as shown in Figure 2. Do
NOT remove the hinge screw during this process. Final installation approval
shall be based upon passing section 7.2.2 and/or 8.2.4 tests.
FIGURE 2.
REMOVE SCREW AND PIVOT
DETECTOR AS SHOWN BELOW.
REPLACE SCREW
TO SECURE DETECTOR
IN PLACE.
H0550-00
[5.3] 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.
[5.3.1] FOR RECTANGULAR SIDE-BY-SIDE MOUNTING
CONFIGURATION
Center punch at (4) target centers: (2) “A” for sampling tubes and (2) “B” for
the rectangular configuration mounting tabs as shown on mounting template.
Drill pilot holes at target “A” centers and cut two 1.375 inch diameter holes
using a 13/8inch hole saw or punch. Drill .156 inch diameter holes using a 5/32
inch drill at target “B” centers.
[5.3.2] FOR SQUARE TOP-OVER-BOTTOM MOUNTING
CONFIGURATION OR D4SA SENSOR COMPONENT MOUNTING
Center punch at (4) target centers: (2) “A” for sampling tubes and (2) “C” for
the square configuration mounting tabs as shown on mounting template. Drill
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[2] FIGURE 1. EXPLODED VIEW OF DUCT SMOKE DETECTOR COMPONENTS
H0549-06

pilot holes at target “A” centers and cut two 1.375 inch diameter holes using
a 13/8inch hole saw or punch. Drill .156 inch diameter holes using a 5/32 inch
drill at target “C” centers. If desired, drill an additional .156 inch hole at the
location of one of the mounting tabs on the lower housing.
[5.4] SECURE THE DUCT DETECTOR TO THE DUCT
Use two (rectangular configuration) or three (square configuration) of the pro-
vided sheet metal screws to screw the duct detector to the duct.
CAUTION: Do not overtighten the screws.
[6] SAMPLING TUBE INSTALLATION
[6.1] SAMPLING TUBE SELECTION
The sampling tube must be purchased separately. Order the correct length,
as specified in Table 1, for width of the duct where it will be installed. It is rec-
ommended that the sampling tube length extend at least 2/3across the duct
width for optimal performance.
TABLE 1. SAMPLING TUBES RECOMMENDED FOR DIFFERENT
DUCT WIDTHS
Outside Duct Width Sampling Tube Recommended*
Up to 1 ft. DST1
1 to 2 ft. DST1.5
2 to 4 ft. DST3
4 to 8 ft. DST5
8 to 12 ft. DST10 (2-piece)
*Must extend a minimum of 2/3the duct width. These sampling tubes can only
be used with new InnovairFlex duct smoke detectors.
The sampling tube is always installed with the air inlet holes facing into the
air flow. To assist proper installation, the tube’s connector is marked with an
arrow. Make sure the sampling tube is mounted so that the arrow points into
the airflow as shown in Figure 3. 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 3. The sampling tube and exhaust tube
can be mounted in either housing connection as long as the exhaust tube is
mounted downstream from the sampling tube.
FIGURE 3. AIR DUCT DETECTOR SAMPLING TUBE
SAMPLING TUBE ENDCAP
ARROW MUST FACE
INTO AIR FLOW
AIR FLOW
DIRECTION
H0551-00
CAUTION: The sampling tube end cap, included with the detector, is critical
to proper operation of the duct smoke detector. The end cap is needed to
create the proper air flow to the sensor of the duct smoke detector. Once any
sampling tube length adjustments are made, plug the end of the sampling
tube with the provided end cap.
A plastic exhaust tube is included with the unit to be installed if needed. Install
into the housing connection that is downstream from the sampling tube con-
nection. The exhaust tube can be installed from the front or back of the detec-
tor. A longer 1 foot exhaust tube, model ETX, is available as an accessory in
cases where the molded exhaust tube does not extend at least 2 inches into
the duct.
[6.2] SAMPLING TUBE INSTALLATION
1. For tubes shorter than the width of the duct, slide the sampling tube,
with installed end cap, into the housing connection that meets the airflow
first. Position the tube so the arrow points into the airflow as shown in
Figure 3. Per NFPA sampling tubes over 3 feet long should be sup-
ported at the end opposite the duct detector. In ducts wider than 8 feet,
work must be performed inside the duct to couple the other section of
the sampling tube to the section already installed using the 1/2inch con-
duit fitting. Make sure that the holes on both sections of the air inlet
sampling tube are lined up and facing into the airflow.
2. For tubes longer than the width of the duct, the tube should extend out of
the opposite side of the duct. Drill a 3/4inch hole in the duct opposite the
hole already cut for the sampling tube. Ensure that the sampling tube
is angled downward from the duct smoke detector to allow for moisture
drainage away from the detector. The sampling tube should be angled
at least 1/4” downward for every 12” of duct width per Figure 4. There
should be 10 to 12 holes spaced as evenly as possible across the width
of the duct. If there are more than 2 holes in the section of the tube ex-
tending out of the duct, select a shorter tube using Table 1. Otherwise,
trim the tube to leave approximately 1 to 2 inches extending outside
the duct. Plug the end with the end cap and tape closed any holes in
the protruding section of tube. Be sure to seal the duct where the tube
protrudes.
FIGURE 4.
DETECTOR
3/4˝
HOLE
12˝
1/4˝
2˝
H0215-00
NOTE: Air currents inside the duct may cause excessive vibration, espe-
cially 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 to 11/4inch hole where the flange will be used.
[6.3] MODIFICATIONS OF 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 a sampling tube that is
longer than necessary to span the duct width.
Use a 0.193 inch diameter (#10) 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 and is not
intended as a substitute for ordering the correct length tubes.
[7] MEASUREMENT TESTS
[7.1] AIR FLOW
The D4120A is designed to operate over an extended air speed range of
100 to 4000 FPM. To verify sufficient sampling of ducted air, turn the air han-
dler on and use a manometer to measure the differential pressure between
the two sampling tubes. The differential pressure should measure at least
0.01 inches of water and no more than 1.11 inches of water. Because most
commercially available manometers cannot accurately measure very low
pressure differentials, applications with less than 500 FPM of air speed may
require one of the following: 1) the use of a current-sourcing pressure trans-
mitter (Dwyer Series 607) per Section 7.2, or 2) the use of aerosol smoke per
section 12.5.3.
[7.2] LOW FLOW AIR FLOW TEST USING DWYER SERIES 607
DIFFERENTIAL PRESSURE TRANSMITTER
Verify the air speed of the duct using an anemometer. Air speed must be at
least 100 FPM. Wire the Dwyer transmitter as shown in Figure 5. Connect
the leads of the meter to either side of the 1000Ω resistor. Allow unit to warm
up for 15 seconds. With both HIGH and LOW pressure ports open to ambient
air, measure and record the voltage drop across the 1000Ω resistor (mea-
surement 1), 4.00 volts is typical. Using flexible tubing and rubber stoppers,
connect the HIGH side of the transmitter to the sampling tube of the duct
smoke detector housing, and the LOW side of the transmitter to the exhaust
tube of the duct smoke detector housing. Measure and record the voltage
drop across the 1000Ω resistor (measurement 2). Subtract the voltage re-
corded in measurement 1 from the voltage recorded in measurement 2. If the
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difference is greater than 0.15 volts, there is enough air flow through the duct
smoke detector for proper operation.
FIGURE 5. PROCEDURE FOR VERIFYING AIR FLOW LESS THAN 500 FPM
HIGH LOW
9 VOLT
BATTERY
9 VOLT
BATTERY
9 VOLT
BATTERY
TO SAMPLING TUBE
TO EXHAUST TUBE
DIFFERENTIAL
PRESSURE
TRANSMITTER
MODEL #607-01
15 TO 36
VDC SUPPL
Y
1000 OHM 5%
1 WATT RESISTOR
VOLT METER FLUKE
MODEL 87 OR
EQUIVALENT
+–
H0163-01
[8] FIELD WIRING INSTALLATION GUIDELINES
All wiring must be installed in compliance with the Canadian 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 ac-
cessory devices should be color-coded to prevent wiring mistakes. Improper
connections can prevent a system from responding properly in the event of
a fire.
For signal wiring, (wiring between interconnected detectors or from detec-
tors to auxiliary devices), it is recommended that single conductor wire be no
smaller than 18 gauge.
Smoke detectors and alarm system control panels have specifications for al-
lowable loop resistance. Consult the control panel manufacturer’s specifica-
tions for the total loop resistance allowed for the particular control panel being
used before wiring the detector loop.
[8.1] WIRING INSTRUCTIONS
The D4120A and D4P120A detectors are designed for easy wiring. The hous-
ing provides a terminal strip with clamping plates. The D4SA housing pro-
vides 4 wiring terminals with clamping plates. Wiring connections are made
by sliding the bare end of the wire under the plate, and tightening the clamp-
ing plate screw. See Figure 7 on page 5 for system wiring.
[8.2] SENSOR 2 INSTALLATION/WIRING
The power board is capable of controlling a second housed sensor. The sec-
ond sensor, model D4SA, can be wired to the power board per the following:
1. Connect wires to the four wire terminals in the corner of the D4SA sensor
housing designated as Tamper (Y,Y), +R, and –B. Route wires through
the conduit openings in the sensor housing and D4120A power board
housing.
2. Connect the opposing ends of the wires to the terminal connections
marked “Sensor 2” on the Power board. See Figure 6 for reference.
Ensure that wires are connected to the appropriate terminal locations. A
No. 0 or 1 phillips screwdriver should be used for terminal connection.
The tamper terminals are not polarity sensitive.
3. Adjust the middle dip switch on the power board to indicate (2) sensors
as shown in Figure 6.
4. The D4SA can only be used with new InnovairFlex models and is not
compatible with previously sold detectors.
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FIELD SELECTABLE
DIP SWITCHES
TEST/RESET
BUTTON
POWER
BOARD LED 2
SENSOR
LEDs
GROUND
SCREW
SENSOR #1
TERMINALS
D4120A
CO-LOCATED
WIRING TERMINALS
24V AC/DC, 10
24V AC/DC, 9
AUX OUT +, 19
AUX OUT -, 20
INT/AUX-, 1
INT+, 12
ALARM, 15
R TEST, 11
R RESET, 2
ACC -
ACC +
120 VAC
B
-
R
+
YY
B
-
R
+
Y
Y
TAMPER TA MPER
SENSOR 1SENSOR 2
OFF/ON TRBL SHUTDN
1/2 SENSORS
7/0 MIN TMPR DELAY
7, NO
18, C
AUX B
8, NC 17, NO
AUX A
6, C
16, NC
14, N0
3, C
13, NC 5, NO
SUPALARM
4, C
D4SA
SENSOR ONLY
SENSOR #2
TERMINALS
TAMPER
Y Y R B
Y Y R B
+ –
TAMPER
+ –
SENSOR 2
D4120A
D4SA
NOTE: IF USING (2) D4SA
SENSOR ONLY
COMPONENTS WITH
MODEL D4P120A POWER
BOARD COMPONENT, USE
SENSOR #1 TERMINALS
A
ND WIRE IN SAME
MANNER AS SHOWN FOR
SENSOR #2.
POWER
BOARD LED 1
120
VAC INPUT
24 VAC/
DC INPUT H0557-01CDN
FIGURE 6. OPTIONAL SENSOR 2 CONFIGURATION AND WIRING

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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.
24VAC/DC
9 10
AUXILIARY CONTACTS
FOR FAN SHUTDOWN, ETC. (NOTE 2)
16 6178187
N.O.
C.
N.C.
N.O.
C.
N.C.
16 6178 18 7
N.O.
C.
N.C.
N.O.
C.
N.C.
SUPERVISORY CONTACTS
(NOTE 3)
24V
9 10
AUXILIARY CONTACTS
FOR FAN SHUTDOWN, ETC. (NOTE 2)
SUPERVISORY CONTACTS
(NOTE 3)
SUP C. SUP N.O. SUP N.O.
SUP C.
5
4
ALARM
INITIATION
CONTACTS
(NOTE 4)
5
4
ALARM
INITIATION
CONTACTS
(NOTE 4)
INITIATION
LOOP
ULC/FM LISTED
4-WIRE
CONTROL PANEL
+
120
VAC
120
VAC
OR OR
AUX A AUX B
AUX A AUX B
ALARM C.ALARM C.
ALARM N.O.
ALARM N.O.
14 14
33
FIRST DETECTOR IN THE LOOP
POWER INPUTS (NOTE 1) POWER INPUTS (NOTE 1)
LAST DETECTOR IN THE LOOP
EOL RESISTOR
SPECIFIED BY
PANEL
MANUFACTURER
NOTE 1: 24V Power Inputs accept a non-polarized 24VDC or 24VAC 50-
60Hz. 120VAC Power Inputs accept only 120VAC 50-60Hz. Connect power
source to appropriate terminals of each detector. See specifications for ad-
ditional power supply information.
NOTE 2: Auxiliary contacts shown in standby position. Contacts switch dur-
ing alarm as indicated by arrows. Auxiliary contacts are not to be used for
connection to the control panel. See specifications for contact ratings.
NOTE 3: Supervisory contacts shown in standby position. Open contacts in-
dicate a trouble condition to the panel. See specifications for contact ratings.
NOTE 4: Initiation contacts shown in standby position. Closed contacts indi-
cate an activated condition to the panel. See specifications for contact ratings.
H0558-02CDN
Designation Default Selection Features
TRBL SHUTDN OFF OFF Aux relay does not switch states with a Trouble condition
ON Aux relay switches states with a Trouble condition
SENSORS
1 1 Only one sensor is connected the Power Board
2Two sensors are connected to the Power Board
MIN TMPR
DELAY
7 7
Provides a Trouble condition ( terminals 3 and 14 open) when Sensor Housing cover has
been removed or has been secured improperly for more than 7 minutes
0Provides an instantaneous Trouble condition(terminals 3 and 14 open) upon cover removal
TABLE 2. DIP SWITCH SETTINGS
[9] UNIT CONFIGURATION
A three position Dip Switch is included only on the D4P120A in order to con-
figure the setup of the unit. One switch is used to determine it there are one
or two sensors connected to the Power Board. The second switch selects an
instantaneous or 7-minute tamper Delay. A tamper Condition indicates that
the cover of the sesor Housing has been removed or has not been secured
properly. The third switch is used to turn the Shutdown On Trouble feature
on or off. With this feature turned On, the Aux relay will switch states when a
Trouble Condition occurs.
*Trouble is indicated when the Supervisory Relay, switches state-Termi-
nals 3 and 14 are open in a Trouble Condition
Causes of a Trouble Condition may be:
• Unit loses Power
• Cover Tamper Feature times out
• Wiring Problems between the Sensor and the Power Board
• Mismatch between number of sensors connected to the Power Board
and the Dipswitch setting

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[10] DETECTOR STATUS INDICATION
Detector Staus is indicated by the LED sensor, and the correcsponding LED
on the power board. The power board has two separate LED’s to indicate the
status of each sensor connected to it. Refer to Table 3 on page 8 for more
details.
[11] INTERCONNECTION (MULTIPLE FAN SHUT DOWN)
When using the interconnect feature, an alarm from an initiating device will
switch the Aux Relays on the other devices interconnected.
FIGURE 8. MULTIPLE FAN SHUTDOWN
(INTERCONNECTION OF D4120A’S)
DETECT
OR 1
120 VACD4120A
C, AUX A
NC, AUX A
50
DET.
MAX.
INT/AUX–
INT+
SYSTEM CONTROL
POWER, FAN
CONTROL OR
THERMOSTAT
SYSTEM CONTROL
POWER, FAN
CONTROL OR
THERMOSTAT
12
1
–
+
2
11
15
20
19
9
10
16
6
5
13
3
14
17
8
18
7
4
DETECTOR 2
120 VACD4120A
C, AUX A
NC, AUX A
INT/AUX–
INT+
12
1
–
+
2
11
15
20
19
9
10
16
6
5
13
3
14
17
8
18
7
4
H0552-00CDN
FIGURE 9. MULTIPLE FAN SHUTDOWN
(INTERCONNECTION OF D4120A TO DH100ACDC)
DH100ACDC DH100ACDC
D4120A
D4120A
D4120A
H0617-00CDN
[11.1] IMPORTANT INTERCONNECTION NOTES
• When using the interconnect feature, all interconnected units must be
powered using the same independent supply.
• Polarity must be maintained throughout the interconnect wiring.
Connect the INT+ terminal on unit 1 to the INT+ terminal on unit 2 and
so on. Similarly, connect the INT/AUX- terminal on unit 1 to the INT/
AUX- terminal on unit 2 and so on.
• Up to 50 D4120A units may be interconnected.
• Up to 10 DH100ACDC units may be interconnected. Please note that
each of the 9 DH100ACDC units interconnected can be substituted by
three D4P120A units. Therefore, when using the interconnect feature
a single DH100ACDC can drive either 9 DH100ACDC’s or 27 D4120A
units.
NOTE: Alarm can be reset only at the initiating device and not at the devices
interconnected.
[12] VERIFICATION OF OPERATION
[12.1] FIELD SELECTABLE SETTINGS
Verify dip switch settings as per Table 2 on Page 5.
[12.2] POWERING THE UNIT
Apply 24 VDC power to 9 and 10 terminals on the D4P120A or apply 120
VAC on terminals named 120VAC. See Figure 7 and electrical specifications
for details.
[12.3] PERFORM DETECTOR CHECK
VERIFY STANDBY AND TROUBLE TEST per Table 3 on page 8. The use
of a remote accessory for visible indication of power and alarm is recom-
mended.
NOTE: If an instantaneous tamper delay is selected a trouble may be indi-
cated with the cover installed.
[12.4] SENSITIVITY VERIFICATION
The sensitivity of the sensor is confirmed to be operating within its allowable
range each time the sensor and power board LEDs blink green every 5 sec-
onds. Note in a maintenance condition the sensor LEDs will blink red every
5 seconds and power board will blink amber as depicted in Table 3 on page
8. The maintenance condition indicates that the sensor is operating outside
its original factory preset sensitivity and shall be cleaned or replaced. See
Section 9 for reference. Also,the GEMINI model 501 aerosol generator can
be used for smoke entry testing. Set the generator to represent 4%/ft to 5%/ft
obscuration as described in the GEMINI 501 manual. Using the bowl shaped
applicator, apply aerosol until the panel alarms.
[12.5] 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 signalling
and possible dispatch of the fire department.
[12.5.1] ALARM TESTS
1a. Test/Reset Button - Press and hold the test button located on the power
board cover for at least 2 seconds.
OR
1b. M02-04-00 Magnet Test - Place the painted surface of the magnet onto
the MAGNET TEST location on the sensor cover of unit (Figure 1).
OR
1c. Remote Test Accessory - See list on page 1.
The red alarm LED on the sensor and the power board should latch
on, as should any accessories (i.e. RA400ZA, RTS451). Verify system
control panel alarm status and control panel execution of all intended
auxiliary functions (i.e fan shutdown, damper control, etc.).
2. The detector must be reset by the system control panel, front cover Test/
Reset button, or remote accessory.
3. To reset using the Test/Reset button on the power board cover simply
Press and release.
4. Verify airflow test per Section 7 has been performed.
[12.5.2] SMOKE RESPONSE TESTS
To determine if smoke is capable of entering the sensing chamber, visually
identify any obstructions. Plug the exhaust and sampling tube holes to pre-
vent 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.
[12.5.3] SMOKE ENTRY USING AEROSOL SMOKE
This test is intended for low-flow systems (100-500 FPM). If the air speed is
greater than 500 FPM, use a conventional manometer to measure differential
pressure between the sampling tubes, as described in Section 7.1.
Drill a 1⁄4inch hole 3 feet upstream from the duct smoke detector. With the air
handler on, measure the air velocity with an anemometer. Air speed must be
at least 100 FPM. Spray aerosol smoke* into the duct through the 1⁄4inch hole
for five seconds. Wait two minutes for the duct smoke detector to alarm. If the
duct smoke detector alarms, air is flowing through the detector. Remove the
duct smoke detector cover and blow out the residual aerosol smoke from the
chamber and reset the duct smoke detector. Use duct tape to seal the aerosol
smoke entry hole.
*Aerosol smoke can be purchased from Home Safeguard Industries, model
25S Smoke Detector Tester, Malibu, CA. Phone: [phone]. When used
properly, the canned smoke agent will cause the smoke detector to go into

7 I56-3102-003
7/8/2019
FIGURE 10. DETECTOR SENSOR EXPLODED VIEW
SENSOR
COVER
SENSING
CHAMBER
COVER AND
SCREEN
SENSOR
CHAMBER
COVER
REMOVAL
TABS
H0584-00
FIGURE 11. WIRING DIAGRAMS FOR OPTIONAL ACCESSORIES
ALARM
AUX OUT –
15
20
(+)
(–)
ALARM
AUX OUT –
15
20
(+)
(–) RED
MHR/MHW
(OPTIONAL) AUDIO
ALERT
D4120A
DUCT DETECTOR
D4120A
DUCT DETECTOR
RA400ZA(OPTIONAL)
REMOTE (LED)
ANNUNCIATOR
H0554-00CDN
FIGURE 13. WIRING DIAGRAM FOR D4120A TO RTS451/RTS-
451KEYA
10
9
19
20
1
12
15
2
6
1
5
4
3
D4120A
RTS451/RTS451KEYA
(GREEN LED)
POWER
(RED LED)
ALARM
FIELD
INSTALLED
JUMPER
11
2
+
–
AUX OUT +
AUX OUT –
ALARM
R TEST
ACC +
ACC –
R RESET
7
18
8
17
6
16
14
3
13
5
4
SUP, NO
SUP, C
FOR RTS451KEYA ONLY WITHOUT A CONTROL PANEL
H0582-00CDN
alarm. Refer to the manufacturer’s published instructions for proper use of
the canned smoke agent.
CAUTION
Canned aerosol simulated smoke (canned smoke agent) formulas will vary
by manufacturer. Misuse or overuse to these products may have long term
adverse effects on the smoke detector. Consult the canned smoke agent man-
ufacturer’s published instructions for any further warnings or caution state-
ments.
[12.6] INSTALL THE COVER
Install the covers making sure that the cover fits into the base groove. Tighten
the seven screws that are captured in the covers.
[13] 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.
[13.1] DETECTOR SENSOR
1. Remove the sensor to be cleaned from the system.
2. Remove the sensor cover by pulling outward on each of the four re-
moval tabs that hold the cover in place. See Figure 10.
3. Vacuum the screen carefully without removing it. If further cleaning is
required continue with Step 4, otherwise skip to Step 7.
4. Remove the chamber cover/screen assembly by pulling it straight out.
5. Use a vacuum cleaner or compressed air to remove dust and debris
from the sensing chamber.
6. Reinstall the chamber cover/screen assembly by sliding the edge over
the sensing chamber. Turn until it is firmly in place.
7. Replace the cover using the holes for the LEDs for alignment and then
gently pushing it until it locks into place.
8. Reinstall the detector.
[13.2] REINSTALLATION
1. Reinstall the detector in its housing.
2. Restore system power.
3. Perform Detector Check, Section 12.3.
4. Notify the proper authorities testing has been completed and the smoke
detector system is back in operation.
[14] SENSOR REPLACEMENT (PART NO. 2D51A)
1. Remove the sensor head by rotating counterclockwise.
2. Pull gently to remove it.
3. To replace the sensor head, align the mounting features and rotate
clockwise into place.
[15] OPTIONAL ACCESSORIES
[15.1] RTS451/RTS451KEY REMOTE TEST STATION
The RTS451/RTS451KEYA Remote Test Station facilitates test of the alarm
capability of the duct smoke detector as indicated in the RTS451/RTS-
451KEYA manual. The D4120A duct smoke detector can be reset by the
RTS451/RTS451KEYA. To install the RTS451/RTS451KEYA, connect the
device as shown in Figure 12; wire runs must be limited to 25 ohms or less
per interconnecting wire. If a system control panel is used, the panel itself
may require testing.

8 I56-3102-003
©2019 System Sensor. 7/8/2019
THREE-YEAR LIMITED WARRANTY
System Sensor warrants its enclosed product to be free from defects in materials and
workmanship under normal use and service for a period of three years from date of man-
ufacture. System Sensor makes no other express warranty for the enclosed product. No
agent, representative, dealer, or employee of the Company has the authority to increase
or alter the obligations or limitations of this Warranty. The Company’s obligation of this
Warranty shall be limited to the replacement of any part of the product which is found to
be defective in materials or workmanship under normal use and service during the three
year period commencing with the date of manufacture. After phoning System Sensor’s
toll free number 800-SENSOR2 (736-7672) for a Return Authorization number, send de-
fective units postage prepaid to: System Sensor Canada (3PL), c/o Kuehne and Nagel,
6335 Edwards Blvd., Mississauga, Ontario L5N 2W7, RA #__________. Please include
a note describing the malfunction and suspected cause of failure. The Company shall
not be obligated to replace units which are found to be defective because of damage,
unreasonable use, modifications, or alterations occurring after the date of manufacture.
In no case shall the Company be liable for any consequential or incidental damages for
breach of this or any other Warranty, expressed or implied whatsoever, even if the loss
or damage is caused by the Company’s negligence or fault. Some states do not allow
the exclusion or limitation of incidental or consequential damages, so the above limita-
tion or exclusion may not apply to you. This Warranty gives you specific legal rights, and
you may also have other rights which vary from state to state.
Please refer to insert for the Limitations of Fire Alarm Systems
TABLE 3. DETECTOR STATUS INDICATION
NOTE: There are two LED’s on the Power board D4P120A, each indicating the Status of the two sensors connected. When
there is only one sensor connected, LED2 will remain off.
Sensor
D4S
Power Board
D4P120
At power-up or reset at the panel, the
sensor will take approx 45 seconds
to initialize. Also occurs if the sensor
has been removed and restored in
the base in the sensor housing.
RED Blink every 5
seconds
Alternating
Green/amber
every 1 second
Supervisory relay: Terminals 3 and 14 are open.
Alarm Relay: Terminals 4 and 5 are open.
Aux Relay does not switch states:Terminals 6 and 16 are closed,Terminals 8 and 18 are closed
Sensor is missing during the seven
minute tamper Delay, if selected. Off
Alternating
Green/amber
every 1 second
Supervisory relay: Terminals 3 and 14 are closed
Alarm Relay: Terminals 4 and 5 are open.
Aux Relay does not switch states:Terminals 6 and 16 are closed,Terminals 8 and 18 are closed
Maintenance
Sensor D4S is outside it's UL
approved sensitivity limits and needs
to be cleaned or replaced.
RED Blink every 5
seconds
Amber Blink
every 5 seconds
Supervisory relay: Terminals 3 and 14 are closed.
Alarm Relay: Terminals 4 and 5 are open.
Aux Relay does not switch states:Terminals 6 and 16 are closed,Terminals 8 and 18 are closed
.Unit loses Power Off Off
.Cover Tamper Delay times out Green Blink every 5
seconds Amber solid
.Wiring Problems between the
Sensor and the Power Board Off Amber solid
.Mismatch between the number of
sensors connected and the Dip
Switch setting
1 sensor connected,2 selected
Green blink every 5
seconds on first
sensor.
No second sensor.
LED1 Green
blink every 5
seconds
LED2 Amber
solid
2 sensors connected,1 selected
Green blink every 5
seconds on first
sensor.
LED's off on second
sensor
LED1 Green
blink every 5
seconds
LED2 Amber
solid
Alarm Unit detects smoke Solid Red Solid Red
Supervisory relay: Terminals 3 and 14 are closed
Alarm Relay: Terminals 4 and 5 are closed.
Aux Relay switches states: Terminals 6 and 16 are open, Terminals 8 and 18 are open
Standby
Unit has Power and it is not in
initialization, Trouble, Maintenance or
Alarm.
Green Blink every 5
seconds
Green Blink
every 5 seconds
Supervisory relay: Terminals 3 and 14 are closed
Alarm Relay: Terminals 4 and 5 are open.
Aux Relay does not switch states: Terminals 6 and 16 are closed, Terminals 8 and 18 are closed
LED Status
Status Description Status of Relays
Supervisory relay: Terminals 3 and 14 are open.
Alarm Relay: Terminals 4 and 5 are open.
Aux Relay does not switch states with no shutdown on Trouble selected:
Terminals 6 and 16 are closed. Terminals 8 and 18 are closed.
Aux Relay Switches states with shutdown on Trouble selected:
Terminals 6 and 16 are open, Terminals 8 and 18 are open
Trouble
Sensor
Initialization