tions.
NOTE:
MRI-2351RAP is also listed for use inside DNR(W) duct smoke
detectors.
WIRING GUIDE
All wiring must be installed in compliance with the National Electrical Code,
applicable local codes, and any special requirements of the Authority Having
Jurisdiction. Proper wire gauges should be used. The installation wires should
be color-coded to limit wiring mistakes and ease system troubleshooting. Im-
proper connections will prevent a system from responding properly in the
event of a fire.
Remove power from the communication line before installing sensors.
1. Wire the sensor base (supplied separately) per the wiring diagram, Figure 2.
2. Set the desired address on the sensor address switches, see Figure 1.
3. Install the sensor into the sensor base. Push the sensor into the base while
turning it clockwise to secure it in place.
4. After all sensors have been installed, apply power to the control panel and
activate the communication line.
5. Test the sensor(s) as described in the TESTING section of this manual.
CAUTION
Dust covers provide limited protection against airborne dust particles during
shipping. Dust covers must be removed before the sensors can sense smoke.
Remove sensors prior to heavy remodeling or construction.
FIGURE 2. WIRING DIAGRAM
2
3
1
2
3
3
1
2
1
(–)
(+)
+
-
UL Listed Compatib
le
Control P
anel
CAUTION: Do not loop wire under
terminal 1 or 2. Break wire run to
supervise connections.
CLASS A OPTIONAL WIRING
Remote
Annunciator
(–)
(+)
RA
+
–
+
RA
+
–
+
RA
+
–
+
C0129-10
TAMPER-RESISTANCE
MRI-2351RAP includes a tamper-resistant capability that prevents removal
from the base without the use of a tool. Refer to the base manual for details on
making use of this capability.
TESTING
Before testing, notify the proper authorities that the system is undergoing
maintenance, and will temporarily be out of service. Disable the system to
prevent unwanted alarms.
All sensors must be tested after installation and periodically thereafter. Test-
ing methods must satisfy the Authority Having Jurisdiction (AHJ). Sensors
offer maximum performance when tested and maintained in compliance with
NFPA 72.
SPECIFICATIONS
Operating Voltage Range:
15 to 32 VDC
Operating Current @ 24 VDC:
200 uA (one communication every 5 seconds with green LED blink on communication)
Maximum Alarm Current:
2 mA @ 24 VDC (one communication every 5 seconds with red LED solid on)
Maximum Current:
4.5 mA @ 24 VDC (one communication every 5 seconds with amber LED solid on)
Operating Humidity Range:
10% to 93% Relative Humidity, Non-condensing
Operating Temperature Range:
32°F to 122°F (0°C to 50°C), -4°F to 158°F (-20°C to 70°C) in duct applications
Air Velocity:
0 to 4000 ft./min. (0 to 1219.2 m/min.)
Height:
2.0˝ (51 mm) installed in B300-6 Base
Diameter:
6.2˝ (156 mm) installed in B300-6 Base; 4.1˝ (104 mm) installed in B501 Base
Weight:
3.4 oz. (95 g)
Isolator Load Rating:
0.0063*
*Please refer to your isolator base/module manual for isolator calculation instructions.
UL268A listed for Duct Applications
This sensor must be installed in compliance with the control panel system
installation manual. The installation must meet the requirements of the Au-
thority Having Jurisdiction (AHJ). Sensors offer maximum performance when
installed in compliance with the National Fire Protection Association (NFPA);
see NFPA 72.
GENERAL DESCRIPTION
MRI-2351RAP is a plug-in type smoke sensor that combines a photoelectronic
sensing chamber with addressable-analog communications. When used in
duct applications with a DNR(W), testing can be done remotely using ap-
proved System Sen sor test accessories, eliminating the need for a test coil. The
sensors transmit an analog representation of smoke density over a communi-
cation line to a control panel. Rotary dial switches are provided for setting the
sensor’s address.
FIGURE 1. ROTARY ADDRESS SWITCHES
TENS
ONES
9
10
11
12
13
14
15
8
7
6
5
4
3
2
1 0
9
8
7
6
5
4
3
2
1 0
C0162-00
Two LEDs on the sensor are controlled by the panel to indicate sensor status.
An output is provided for connection to an optional remote LED annunciator
(P/N RA100Z).
Note: Only System Sensor approved accessories may be used with the
MRI-2351RAP.
Secutron panels offer different features sets across different models. As a re-
sult, certain features of the photoelectric sensors may be available on some
control panels, but not on others. MRI-2351RAP supports Advanced Protocol
and CLIP (Classic Loop Interface Protocol) mode. The possible features avail-
able if supported by the control panel are:
1. The sensor’s LEDs can operate in three ways—on, off, and blinking–and
they can be set to red, green, or amber. This is controlled by the panel.
2. The remote output may be synchronized to the LED operation or con-
trolled independent of the LEDs.
3. Devices are point addressable up to 159 addresses.
Please refer to the operation manual for the UL listed control panel for specific
operation. The MRI-2351RAP requires compatible addressable communica-
tions to function properly. Connect these sensors to listed-compatible control
panels only.
SPACING
Secutron recommends spacing sensors in compliance with NFPA 72. In low air
flow applications with smooth ceilings, space sensors 30 feet apart (9.1 m).
For specific information regarding sensor spacing, placement, and special ap-
plications, refer to NFPA 72 or the System Smoke Detector Application Guide,
available from Secutron.
Duct Applications:
MRI-2351RAP is listed for use in ducts. See Duct Smoke
Detectors Applications Guide HVAG53 for details on pendant mount applica-
I56-6726-000
INSTALLATION AND MAINTENANCE INSTRUCTIONS
MRI-2351RAP
Advanced Protocol
Intelligent Photoelectric Smoke Sensor
with Remote Test Capability in Duct Applications
25 Interchange Way, Vaughan ON, L4K 5W3
PH: 905-695-3545
1
I56-6726-000
10/10/2020
