System Sensor 7251A Installation And Maintenance Instructions Manual

INSTALLATION AND MAINTENANCE INSTRUCTIONS

6581 Kitimat Rd., Unit #6, Mississauga, Ontario, L5N 3T5

7251A Intelligent Laser Smoke Sensor

Specifications

Operating Voltage Range: 15 to 32 VDC
Standby Current: 330
Max. Alarm Current (LED on:) 6.5 mA @ 24 VDC
Operating Humidity Range: 10% to 93% Relative Humidity, noncondensing
Operating Temperature Range: 0°C to 38°C (32°F to 100°F)
Height: 1.7 inches (43 mm) installed in B210LPA Base
Diameter: 6.1 inches (155 mm) installed in B210LPA Base

4.1 inches (104 mm) installed in B501A Base
Weight: 5.0 oz. (142 g)
Additional Bases Available: All 200/500 Series bases are compatible.

µA @ 24 VDC (one communication every 5 sec. with LED blink enabled)

1-800-SENSOR2, FAX: [phone]

www.systemsensor.ca

Before Installing

This sensor must be installed in compliance with the con­trol panel system installation manual. The installation must
meet the requirements of the Authority Having Jurisdiction
(AHJ). Sensors offer maximum performance when installed
in compliance with CAN/ULC S524.

General Description

Model 7251A is a plug-in type smoke sensor that uses a
laser based sensing chamber. The sensor uses analog­addressable communications to transmit smoke density
and other information to the control panel. Rotary-decade
switches are provided for setting the sensor’s address. 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 RA400Z).

This detector 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 CAN/ULC S524. 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 CAN/ULC S524 or the System
Sensor Guide For Proper Use of System Smoke Detectors,
available from System Sensor (P/N I56-407-XX).

All wiring must be installed in compliance with the Canadian
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 sys
tem from responding properly in the event of a fire.

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. Set the desired address on the sensor address switch­es, see Figure 2.

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 unit and activate the communication line.

5. Test the sensor(s) as described in the TESTING section
of this manual.

-

Wiring Instructions

D200-09-00 1 I56-1986-000

CAUTION

3

2

1

3

2

1

+

–

–

+

OPTIONAL RETURN LOOP

RE M OTE ANNUN C IATOR

+ –

Figure 1. Wiring diagram:

CAUTION

ULC Listed Compatible

Control Panel

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.

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
CAN/ULC S536.

The sensor can be tested in the following ways:
A. Functional: Magnet Test (P/N M02-04-01 or M02-09-

00)

This sensor can be functionally tested with a test mag-

net. The test magnet electronically simulates smoke in
the sensing chamber, testing the sensor electronics and
connections to the control panel.

1. Hold the test magnet in the magnet test area as

Do not loop wire under terminal 1 or 2. Break
wire run to provide supervision of connection.

C0100-00

shown in Figure 3.

2. The sensor should alarm the panel.
Two LEDs on the sensor are controlled by the panel

to indicate sensor status. 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.

B. Smoke Entry: Aerosol Generator (Gemini 501)

The GEMINI model 501 aerosol generator can be used
for smoke entry testing. Set the generator to represent
4%/ft. to 5%/ft. obstruction as described in the GEMINI
501 manual. Using the bowl shaped applicator, apply
aerosol until the panel alarms.

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.

D200-09-00 2 I56-1986-000