System Sensor 1112/24B Manuel utilisateur

D200-63-00 1 I56-931-02

1112/24B and 1112/24BA Ionization

Smoke Detectors

INSTALLATION AND MAINTENANCE INSTRUCTIONS

A Division of Pittway

3825 Ohio Avenue, St. Charles, Illinois 60174

1-800-SENSOR2, FAX: 630-377-6495

Before Installing

Please thoroughly read System Sensor Manual I56-407,

Guide for Proper Use of System Smoke Detectors, which

provides detailed information on detector spacing,

placement, zoning, wiring, and special applications.

Copies of this manual are available at no charge from

System Sensor. (For installation in Canada, refer to

CAN/ULC-S524-M91, Standard for the Installation of

Fire Alarm Systems, and CEC Part 1, Sec. 32.)

NOTICE: This manual should be left with the owner/user

of this equipment.

IMPORTANT: This detector must be tested and maintained

following NFPA 72 requirements. The detector should be

cleaned at least once a year.

Specifications

Diameter: 5.5 inches (140 mm)

Height (including adapter bracket): 1.7 inches (43 mm)

Weight: 5.3 oz. (150 g)

Operating Temperature Range: 32°to 120°F (0°to 50°C)

Operating Humidity Range: 10% to 93% Relative Humidity, Noncondensing

Latching Alarm: Reset by momentary power interruption

Relay Contact Ratings–

Resistive or inductive (60% power factor) load

Form A: 0.5A @ 30VAC/DC

Electrical Ratings

System Voltage nominal: 12 or 24 VDC

Minimum: 8.5 VDC

Maximum: 35 VDC

Maximum Ripple Voltage: 30% of nominal voltage (peak to peak)

Reset Voltage: 0.8 VDC minimum

Standby Current: 50 µA maximum

Alarm Current: 17 mA typical, 23 mA maximum @ 12V

19 mA typical, 25 mA maximum @ 24V

Reset Time: 0.3 seconds maximum

Start-up Time: 30 seconds maximum (after 60 second reset)

General Description

The 1112/24B and 1112/24BA are 4-wire ionization

smoke detectors that use a state-of-the-art sensing

chamber. These detectors are designed to provide open

area protection.

Installation of these detectors are simplified by the use

of an adapter bracket and a plug-in screw terminal block

that can be prewired to the system, allowing the detec-

tors to be easily installed or removed for cleaning. The

detector sensitivity can be tested in place using the

MOD400R Test Module.

An LED on the detector provides local visual indication of

the detector status. If power is applied to the detector, and

it is functioning normally in standby, the status LED blinks

every five seconds. The LED also latches on in alarm.

The 1112/24B also features visual indication that mainte-

nance is required; if the sensing chamber drifts out of its

sensitivity limits, the LED ceases to blink.

D200-63-00 2 I56-931-02

Mounting

Each 1112/24B and 1112/24BA detector is supplied with a

mounting bracket that permits the detector to be mounted:

1. To a single gang box, or

2. Directly to a 3 1/2-inch or 4-inch octagonal box, or

3. To a 4 inch square electrical box by using a plaster ring.

Wiring Installation Guidelines

All wiring must be installed in compliance with the Na-

tional Electrical Code, applicable local codes, and any spe-

cial requirements of the local authority having jurisdiction.

Proper wire gauges should be used. The conductors used to

connect smoke detectors to control panels and accessory

devices should be color-coded to reduce the likelihood of

wiring errors. Improper connections can prevent a system

from responding properly in the event of a fire.

The screw terminal block accepts 14 – 22 gauge wire. For

best system performance, all wiring should be installed in

separate grounded conduit. Do not mix fire system wiring

in the same conduit as any other electrical wiring. Twisted

pair may be used to provide additional protection against

electrical interference.

A78-2336-01

OPTIONAL CLASS A WIRING

EOL RESISTOR

SPECIFIED BY

PANEL

MANUFACTURER

EOL POWER

SUPERVISION

RELAY (SHOWN

ENERGIZED)

A77-716 12/24V

POWER

DETECTORS

UL LISTED

CONTROL

PANEL

INITIATING

LOOP

–

N.O. C

–

N.O. C

Figure 2. 1112/24B and 1112/24BA detector

mounting bracket:

ALIGNMENT ARROWS

TAMPER RESISTANT TAB

(CUT OFF SMALL TAB TO

ACTIVATE TAMPER-RESIST

FEATURE)

Figure 1. Surface mounting 1112/24B and 1112/24BA

detectors on 3 1/2-inch and 4-inch octagonal box:

A78-2563-00

,,,,,,,,,,,,,,,,,,,,,,,,

,,,,,,,,,,,,,,,,,,,,,,,,,

A78-2333-02

Figure 3. Wiring diagram for the 1112/24B(A) detector:

Smoke detectors and alarm system control panels have

specifications for allowable loop resistance. Consult the

control panel specifications for the total loop resistance al-

lowed for the control panel being used before wiring the

detector loops.

Wire connections are made by stripping about 1/4inch of

insulation from the end of the feed wire, inserting the wire

into the appropriate terminal, and tightening the screw to

secure the wire in place.

Tamper-Resist Feature

This detector includes a tamper-resist feature that prevents

its removal from the bracket without the use of a tool. To

make the detector tamper-resistant, remove the smaller tab

by breaking it at the scribed line on the tamper resistant tab

on the detector mounting bracket (see Figure 2), then in-

stall the detector. To remove the detector from the bracket

once it has been made tamper resistant, use a small screw-

driver to depress the tamper-resistant tab, located in the

slot on the mounting bracket (see Figure 4), and rotate the

detector counterclockwise.

D200-63-00 3 I56-931-02

Installation

WARNING

Remove power from the control unit or initiating device cir-

cuits before installing detectors.

1. Wire the plug-in screw terminal block per Figure 3 and

plug the terminal block into the detector.

2. Align the arrows on the detector with the arrows on the

mounting bracket.

3. Rotate the detector clockwise in the mounting bracket

until it clicks into place.

4. After all detectors have been installed, apply power to

the control unit or initiating device circuits.

5. Test the detector as described in TESTING.

6. Reset the detector at the system control panel.

7. Notify the proper authorities the system is in operation.

CAUTION

Dust covers are an effective way to limit the entry of dust

into smoke detector sensing chambers. However, they may

not completely prevent airborne dust particles from enter-

ing the detector. Therefore, System Sensor recommends the

removal of detectors before beginning construction or other

dust producing activity. Be sure to remove dust covers from

any sensors that were left in place during construction as

part of returning the system to service.

A78-2564-01a

Figure 4. Top and side views showing location of test switch:

PUSH RECESSED

SWITCH WITH A

0.1″MAX. DIAMETER TOOL

,,,,,,,,,,,,,,,,,,,,,,,,,

A78-2564-00a

LED

TEST MODULE

SOCKET RECESSED TEST

SWITCH

Testing

NOTE: Before testing, notify the proper authorities that

the smoke detector system is undergoing mainte-

nance and, therefore, will be temporarily out of

service. Disable the zone or system undergoing

maintenance to prevent unwanted alarms.

Detectors must be tested after installation and following pe-

riodic maintenance. Test the 1112/24B and 1112/24BA as

follows:

A. Test Switch

1. A recessed test switch is located on the detector hous-

ing (See Figure 4).

2. Press and hold the recessed test switch with a 0.1 inch

maximum diameter tool such as an allen wrench or

small screwdriver.

3. The detector’s LED should light within 5 seconds.

B. Test Module (System Sensor Model No. MOD400R).

The MOD400R test module can be used with a DMM or

analog voltmeter to check the detector sensitivity as de-

scribed in the test module’s manual.

C. Smoke Entry Test

Hold a smoldering punk stick or cotton wick at the side

of the detector and gently blow smoke through the de-

tector until the unit alarms.

A detector that fails to activate with any of the above tests

should first be cleaned as outlined in MAINTENANCE. If

the detector still fails to activate, return it for repair.

Notify the proper authorities the system is back in operation.

D200-63-00 4 I56-931-02

Three-Year Limited Warranty

System Sensor warrants its enclosed smoke detector to be free from de-

fects 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 warranty 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 work-

manship under normal use and service during the three year period com-

mencing with the date of manufacture. After phoning System Sensor’s toll

free number 800-SENSOR2 (736-7672) for a Return Authorization number,

send defective units postage prepaid to: System Sensor, Repair Depart-

ment, RA #__________, 3825 Ohio Avenue, St. Charles, IL 60174. Please

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, modifica-

tions, 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 conse-

quential 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 which vary from state to state.

This smoke detector is designed to activate and initiate emergency ac-

tion, but will do so only when it is used in conjunction with an authorized

fire alarm system. This detector must be installed in accordance with

NFPA standard 72.

Smoke detectors will not work without power. AC or DC powered

smoke detectors will not work if the power supply is cut off.

Smoke detectors will not sense fires which start where smoke does not

reach the detectors. Smoldering fires typically do not generate a lot of

heat which is needed to drive the smoke up to the ceiling where the

smoke detector is usually located. For this reason, there may be large de-

lays in detecting a smoldering fire with either an ionization type detector

or a photoelectric type detector. Either one of them may alarm only after

flaming has initiated which will generate the heat needed to drive the

smoke to the ceiling.

Smoke from fires in chimneys, in walls, on roofs or on the other side of a

closed door(s) may not reach the smoke detector and alarm it. A detector

cannot detect a fire developing on another level of a building quickly or at

all. For these reasons, detectors shall be located on every level and in

every bedroom within a building.

Smoke detectors have sensing limitations, too. Ionization detectors and

photoelectric detectors are required to pass fire tests of the flaming and

smoldering type. This is to ensure that both can detect a wide range of

types of fires. Ionization detectors offer a broad range of fire sensing capa-

bility but they are somewhat better at detecting fast flaming fires than

slow smoldering fires. Photoelectric detectors sense smoldering fires better

than flaming fires which have little, if any, visible smoke. Because fires de-

velop in different ways and are often unpredictable in their growth, nei-

ther type of detector is always best, and a given detector may not always

provide early warning of a specific type of fire.

In general, detectors cannot be expected to provide warnings for fires re-

sulting from inadequate fire protection practices, violent explosions, es-

caping gases which ignite, improper storage of flammable liquids like

cleaning solvents which ignite, other similar safety hazards, arson, smok-

ing in bed, children playing with matches or lighters, etc. Smoke detectors

used in high air velocity conditions may have a delay in alarm due to dilu-

tion of smoke densities created by frequent and rapid air exchanges. Addi-

tionally, high air velocity environments may create increased dust

contamination, demanding more frequent maintenance.

Smoke detectors cannot last forever. Smoke detectors contain electronic

parts. Even though smoke detectors are made to last over 10 years, any

part can fail at any time. Therefore, smoke detectors shall be replaced after

being in service for 10 years. The smoke detector system that this detector

is used in must be tested regularly per NFPA 72. This smoke detector

should be cleaned regularly per NFPA 72 or at least once a year.

WARNING

The Limitations of Property Protection Smoke Detectors

Maintenance

NOTE: Before removing the detector, notify the proper au-

thorities that the smoke detector system is under-

going maintenance and will be temporarily out of

service. Disable the zone or system undergoing

maintenance to prevent unwanted alarms.

1. Remove the detector housing by gently prying the four

housing tabs on the bottom of the base with a small-

bladed screwdriver and pull the housing from the base.

2. Vacuum the screen carefully without removing it.

3. Remove the screen by pulling it straight away from the

sensing chamber (see Figure 5).

4. Clean the sensing chamber by vacuuming or blowing

out dust and particles.

5. Replace the screen by sliding it, tab side up, over the

sensing chamber. Make sure that the screen contact

slides into the circuit board contact.

6. Replace the housing by aligning the three triangular slots

on the base with their counterparts on the housing. Gen-

tly press the housing until it locks in place.

REMOVABLE

HOUSING

REMOVABLE

SCREEN

BASE

SENSING

CHAMBER

Figure 5. Removal of cover and screen for cleaning:

A78-2565-01

7. Reinstall the detector.

8. Notify the proper authorities that the system is back in

operation.

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