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

Figure 2. Rotary decade address switches:

TENS ONES

9

8

7

6

5

4

3

2

1

0

9

8

7

6

5

4

3

2

1

0

D

N

T

N

I

A

P

T

O

O

LED STATUS
INDICATORS

TES

T

MAGNET

PAINTED

SURFACE

PAINTED

SURFACE

TEST

MAGNET

MAGNET TEST

MARKER

SENSING
CHAMBER

SCREEN
ASSEMBLY

SENSOR
COVER

COVER REMOVAL
TABS

Figure 3. Test magnet position:

Figure 4. Sensor assembly:

C0146-00

C0169-00

Cleaning

It is recommended that the detector be removed from
its mounting base to facilitate cleaning. The detector is
cleaned as follows:

NOTE: Before removing the detector, notify the proper

authorities that the smoke detector system is
undergoing maintenance and will be temporarily
out of service. Disable the zone or system under­going maintenance to prevent unwanted alarms.

1. Remove the detector cover by prying away the four

side tabs with a small-bladed screwdriver, and then
pulling the cover from the base.

2. Vacuum the screen carefully without removing it. If

further cleaning is required continue with Step 3, oth­erwise skip to Step 7.

3. Remove the screen/chamber cover assembly by pull-

ing it straight out (see Figure 4).

4. Clean the chamber by vacuuming or blowing out dust

and particles.

5. Replace the sensing chamber cover, aligning the

arrow on the top with arrow on the printed circuit
board.

6. To replace the screen, place it over the chamber

assembly, turning it until it snaps into place.

7. Replace the cover using the LEDs to align the cover

and then gently pushing it until it locks into place.

8. Reinstall the detector.

9. Test the detector as described in TESTING.

10. Reconnect disabled circuits.

11. Notify the proper authorities that the system is back

on line.

D200-09-00 3 I56-1986-000

C0170-00

Laser Safety Information

CAUTION

This smoke detector does not produce any hazardous
laser radiation and is certified as a Class 1 laser product
under the U.S. Department of Health and Human Services
(DHHS) Radiation Performance Standard according to the
Radiation Control for Health and Safety Act of 1968.

Any radiation emitted inside the smoke detector is com­pletely within the protective housings and external covers.
The laser beam cannot escape from the detector during
any phase of operation.

The Center of Devices and Radiological Health (CDRH) of
the U.S. Food and Drug Administration implemented regu­lations for laser products on August 2, 1976. These regula­tions apply to laser products manufactured after August 1,

1976. Compliance is mandatory for products marketed in
the United States.

Use of controls, adjustments, or performance of proce­dures other than those specified in this manual may result
in hazardous radiation exposure.

Special Note Regarding Smoke Detector Guards

Smoke detectors are not to be used with detector guards
unless the combination has been evaluated and found
suitable for that purpose.

Please refer to insert for the Limitations of Fire Alarm Systems

Three-Year Limited Warranty

System Sensor warrants its enclosed smoke detector to be free from defects in
materials and workmanship under normal use and service for a period of three
years from date of manufacture. System Sensor makes no other express war
ranty for this smoke detector. 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 repair
or replacement of any part of the smoke detector 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 1-800-SENSOR2 (736-7672) for a Return Authorization number,
send defective units postage prepaid to: System Sensor, Repair Department, RA
#__________, 6581 Kitimat Rd., Unit #6, Mississauga, Ontario, L5N 3T5. Please

FCC Statement

This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful inter­ference, and (2) this device must accept any interference received, including interference that may cause undesired operation.

Note: This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC Rules. These
limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This
equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may
cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful interference in which
case the user will be required to correct the interference at his own expense.

D200-09-00 4 I56-1986-000
© 2005 System Sensor

include a note describing the malfunction and suspected cause of failure. The
Company shall not be obligated to repair or 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 limitation or exclusion may
not apply to you. This Warranty gives you specific legal rights, and you may also
have other rights under common law.