System Sensor 2951 Installation And Maintenance Instructions Manual
INSTALLATION AND MAINTENANCE INSTRUCTIONS
2951 Intelligent Photoelectronic
3825 Ohio Avenue, St. Charles, Illinois 60174
Smoke Sensor
Specifications
Operating Voltage Range: 15 to 30 VDC
Current: 270µA Max. Communication active but not to device in blink mode
LED Current: 6.5 mA Continous ON
Operating Humidity Range: 10% to 93% Relative Humidity, noncondensing
Operating Temperature Range: 0° to 49°C (32° to 120°F)
Height: 1.95 inches (50 mm) installed in Base
Diameter: 4.0 inches (102 mm) installed in Base
Weight: 2.96 oz. (92 g)
Before Installing
This sensor must be installed in compliance with the control panel system installation manual. The installation must
meet the requirements of the A uthority Having Jurisdiction
(AHJ). Sensors offer maximum performance when installed
in compliance with the National Fire Protection Association
(NFPA); see NFPA 72, and all applicable codes, ordinances
and regulations.
General Description
Model 2951 is a plug-in type smoke sensor that combines a
photoelectronic sensing chamber with addressable-analog
communications. The sensor transmits an analog representation of smoke density over a communication line to a
control panel. The sensor’s address is set b y the Hand Held
Programmer (HHP ). An LED on the sensor is controlled b y
the panel to indicate sensor status.
The Model 2951 requires compatible addressable communications to function properly. Connect this sensor to
listed-compatible control panels only.
Spacing
System Sensor recommends spacing sensors in compliance
with NFPA 72. In low air flow applications with smooth
ceilings, space sensors 30 feet apart. For specific information regarding sensor spacing, placement, and special applications, refer to NFPA 72 or the S y stem Sensor Guide For
Proper Use of System Smoke Detectors, available at no
charge from System Sensor (P/N I56-407-XX).
Wiring Instructions
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. Improper connections will prevent
a system from responding properly in the event of a fire.
NOTE: The mounting base (B901) uses SEMS Plate termi-
nals and can accommodate 2 wires each. The 2
wires can differ by a maximum of 2 wire gauges.
Remove power from the communication line before installing sensors.
All wiring must conform to applicable local codes, ordinances, and regulations.
1. Wire the sensor base (supplied separately) per the wiring diagram, see Figure 1.
2. Prior to installation, address the sensor using the Hand
Held Programmer (HHP ). See Hand Held Programmer
instruction manual for proper operation.
3. Install the sensor into the sensor base. Push the sensor
into the base while turning it clockwise to secure it in
place.
1-800-SENSOR2, FAX: 630-377-6495
A Division of Pittway
D200-86-00 1 I56-1321-00
Figure 1:
Remote Annunciator
+
-
+
OUT
+IN/OUT
-
IN
-
+R/A
-
-
-
U.L. listed compatible control panel
4. After all sensors have been installed, apply power to the
control unit and activate the communication line.
5. Test the sensor(s) as described in the TESTING section
of this manual.
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.
+
CAUTION
CLASS A OPTIONAL WIRING
+R/A
+IN/OUT
-
OUT
IN
The sensor can be tested in the following ways:
A. Smoke Entry: Aerosol Generator
Aerosol generators for smoke entry testing are available
from a number of third party manufacturers (e.g.,
Gemini Scientific). Follo wing the manufacturer’ s instructions, apply aerosol until the panel alarms.
Coded signals, transmitted from the panel, can cause the
LEDs to blink, latch on, or latch off. Refer to the control
panel technical documentation for sensor LED status
operation and expected delay to alarm.
+R/A
-
OUT
+IN/OUT
-
IN
A78-2665-01
B. Sensitivity:
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. Testing methods must satisfy the Authority
Having Jurisdiction (AHJ). Sensors offer maximum performance when tested and maintained in compliance with
NFPA 72 and all applicable codes, ordinances and regulations.
D200-86-00 2 I56-1321-00
The sensitivity of the detector can be monitored and
tested by the Hand Held Programmer. R efer to HHP documentation for sensitivity testing information. Certain
control panels may also monitor and test the detector’s
sensitivity. Refer to control panel documentation for sensitivity testing information. The sensitivity indication is
independent of communication. An acceptable sensitivity range is stamped on the back of the sensor.
A sensor that fails any of these tests should be cleaned as
described under CLEANING, and retested. If the sensor fails
after cleaning, it must be replaced and returned for repair.
When testing is complete, restore the system to normal operation and notify the proper authorities that the system is
back in operation.
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