System Sensor 2551, 2551T User Manual
INSTALLATION AND MAINTENANCE INSTRUCTIONS
2551 and 2551T Plug-in Intelligent
Photoelectronic Sensors with
Communications
Specifications
Diameter: 6.1 inches (15.5 cm) installed in B501B
4.0 inches (10.2 cm) installed in B501
Height: 3.2 inches (8.1 cm)
Add 0.5 inches (1.3 cm) for thermal models
Weight: 9.6 ounces (272 g)
Installation Temperature Range
2551: 32° to 120°F (0° to 49°C)
2551T: 32° to 100°F (0° to 38°C)
Installation Humidity Range: 10% to 93% Relative Humidity
Mounting: B501B flanged base
B501 flangeless base
B501 with RMK400 recessed mounting kit
Maximum Air Velocity: 3000 Ft./Min. (15 m/S)
Voltage Range: 15 to 32 Volts DC Peak
Standby Current: 230 µA @ 24 VDC
LED Current: 6.5 mA @ 24 VDC
Before Installing
Please thoroughly read the system wiring and installation
manual, which provides detailed information on sensor
spacing, placement, zoning, and special applications. Copies of these manuals are available from System Sensor.
NOTICE: This manual should be left with the owner/user
of this equipment.
IMPORTANT: These detectors must be tested and maintained regularly following NFPA 72 requirements. These
detectors should be cleaned at least once a year.
General Description
The model 2551/2551T photoelectronic sensors utilize a
state-of-the-art, optical sensing chamber. These sensors are
designed to provide open area protection, and to be used
with compatible control panels only. Connect detectors
only to compatible control units. (For installation in
Canada, refer to CAN/ULC-S524-M86, Standard for the Installation of Fire Alarm Systems and CEC Part 1, Sec. 32.)
The 2551T adds a thermal heat collector that will alarm at a
fixed temperature of 135° F.
Wiring Guide
Refer to the installation instructions for the particular plugin base being used: 1) for the B501B base (D550-01-01); 2)
for the B501 base (D550-02-00); 3) for the RMK400 used
with the B501 base (D450-07-00). Bases are provided with
screw terminals for power, ground, and remote annunciator
connections (see Figure 1).
NOTE: All wiring must conform to applicable local codes,
ordinances, and regulations.
NOTE: Verify that all sensor bases are installed and that
the wiring polarity is correct at each base.
Remove power from the loop before installing sensors.
A Division of Pittway
3825 Ohio Avenue, St. Charles, Illinois 60174
1-800-SENSOR2, FAX: 630-377-6495
WARNING
Two LEDs on each sensor light to provide a local 360° vis-
ibility of the sensor indication. The LEDs can be latched
ON by code command from the panel for an alarm indication. The LEDs can also be unlatched to the normal condition by code command. Remote LED annunciator
capability is available as an optional accessory (part no.
RA400Z).
D500-04-00 1 I56-292-05
1. Install sensors:
a. Verify that the sensor type matches the type written
on the label on the base.
b. Set the sensor to a desired address and then write the
address on the label on the base.
c. Place the sensor into the sensor base.
Figure 1. Wiring Diagram:
REMOTE ANNUNCIAT OR
+-
+
2
3
1
CONTROL PANEL
U.L. LISTED COMPATIBLE
-
+
CLASS A OPTIONAL WIRING
d. Turn the sensor clockwise until it drops into place.
e. Continue turning the sensor clockwise until it locks
into place.
WARNING
Sensor will not detect smoke if dust cover is installed.
2. Tamper-proof feature:
The sensor bases include a tamper-proof feature that,
when activated, prevents removal of the sensor without
the use of a tool. See the installation instruction manual
for the sensor base for details in using this feature.
3. After all sensors have been installed, apply power to the
control unit.
4. Test all sensors per the TESTING section of this manual.
CAUTION: Do not loop wire under terminal 1 or 2.
Break wire run to provide supervision of connections.
2
3
1
2
3
1
Testing
Before testing, notify the proper authorities that the smoke
sensor system is undergoing maintenance, and therefore
the system will temporarily be out of service. Disable the
zone or system undergoing maintenance to prevent unwanted alarms.
Sensors must be tested after installation and periodic maintenance. The sensor may be tested in the following ways:
A. Test Magnet (Model No. M02-04-00)
1. Place the magnet against the cover opposite the test
module socket to activate the test feature (see Figure 2).
2. The LEDs should latch on within 10 seconds indicating alarm and annunciating the panel.
B. Test Module (Model No. MOD400R)
The MOD400R is used with your DMM or voltmeter to
check the sensor sensitivity as described in the
MOD400R’s manual.
A78-1253-01
Figure 2. Views showing position of test magnet (model 2551T shown):
LED
TEST MODULE
SOCKET
LED
D500-04-00 2 I56-292-05
TEST
MAGNET
PAINTED
SURFACE
TEST
MAGNET
A78-1410-01
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