System Sensor 2412 Manual de usuario

D400-06-00 1 I56-286-04R

2412, 2412TH, 2424, and 2424TH

Direct Wire Photoelectronic

Smoke Detectors

INSTALLATION AND MAINTENANCE INSTRUCTIONS

3825 Ohio Avenue

St. Charles, Illinois 60174

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

Before Installing

Please thoroughly read the System Sensor manual I56-407-

XX, Guide for Proper Use of System Smoke Detectors, which

provides detailed information on detector spacing, place-

ment, 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,

Standard for the Installation of Fire Alarm Systems and CEC

Part 1, Sec. 32.)

General Description

System Sensor 2412 and 2424 photoelectronic smoke detec-

tors utilize state-of-the-art, optical sensing chambers. These

detectors are designed to provide open area protection, and

to be used with compatible UL-listed 4-wire control panels

only. The 2412 applies to 12 volt panels and operates at

12VDC, and the 2424 applies to 24 volt panels and operates

at 24VDC. Operation and sensitivity can be tested in place.

Models 2412TH and 2424TH have the same specifications as

models 2412 and 2424, but in addition feature a built-in

fixed temperature (135°F) thermal detection unit.

Specifications

Diameter: 5.5 inches (14 cm)

Height: 3.19 inches (81 mm); Add 0.5 inches (1.3 cm) for thermal units

Weight: 0.7 lb (310 g)

Operating Temperature Range: 2412 and 2424 — 0° to +49°C (32° to 120°F)

2412TH and 2424TH — 0° to +38°C (32° to 100°F)

Operating Humidity Range: 10% to 93% Relative Humidity

Maximum Air Velocity: 3000 Ft./Min. (15 M/S)

Latching Alarm: Reset by momentary power interruption.

Electrical Ratings 2412 2424

System Voltage: 12 24 DC (4V Maximum Ripple)

Supply Voltage: 11.3 20 VDC Minimum

17 29 VDC Maximum

Reset Voltage: .73 .8 VDC Minimum

Standby Current: 120 120 µA Maximum

Alarm Currents: 35 21.3 mA Minimum

77 40.6 mA Maximum

The alarm and auxiliary relay operate within the specified voltage ratings.

Start-up Time: 34 34 S Maximum

EOL Relay: A77-716 A77-716

Reset Time: 0.3 0.3

Relay Contacts – resistive or inductive (60% power factor) load:

Form A: 2.0A @ 30VAC/DC

Form C:* 0.6A @ 110VDC; 2.0A @ 30VDC

1.0A @ 125VAC; 2.0A @ 30VAC

(*For Canadian installations, relay contact rating is 2.0A @ 30VAC/DC)

An LED on each detector lights to provide a local alarm indi-

cation. It flashes every ten seconds indicating that power is

applied to the detector. The LED lights continuously in

alarm. These detectors also have the latching alarm feature

that resets only by a momentary power interruption.

Each detector contains one set of Form A contacts for con-

nection to the alarm-initiating circuit, and one set of Form C

auxiliary contacts. Supervision of detector power is accom-

plished by installing a Power Supervisory End-of-Line Relay

Module (A77-716 Series) at the end of the detector power

loop. When power is applied to and through the detectors,

the EOL Power Supervisory Module is energized. Its relay

contacts close and provide a closed series circuit in the con-

trol panel’s alarm-initiating loop. A power failure or a break

in the detector power loop de-energizes the EOL Module.

The relay contacts open and trigger a trouble signal at the

control panel.

D400-06-00 2 I56-286-04R

Mounting

Each 2412 and 2424 detector is supplied with a mounting

bracket kit that permits the detector to be mounted:

1. Directly to a 31⁄2inch or 4 inch octagonal, 11⁄2inch deep

electrical box, (see Figure 1) or

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

with the supplied mounting bracket kit.

Installation Wiring Guidelines

NOTE: Refer to releasing device manufacturer’s installa-

tion instruction for proper connections.

All wiring must be installed in compliance with the

National Electrical Code and all applicable local codes and

any special requirements of the authority having jurisdic-

tion, using the proper wire size. 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.

For signal wiring (the wiring between interconnected

detectors), it is recommended that the wire be no smaller

than AWG 18. However, the screws and clamping plate, in

the base, can accommodate wire sizes up to AWG 12. The

use of twisted pair wiring for the power (+ and –) loop is

recommended to minimize the effects of electrical interfer-

ence.

Smoke detectors and alarm system control panels have

specifications for allowable loop resistance. Consult the

control panel manufacturer’s specifications for the total

loop resistance allowed for the particular model control

panel being used before wiring the detector loops.

NOTE: For system supervision – for terminals 1, 2, 7, and

8, do not use looped wire under terminals. Break

wire run to provide system supervision of connec-

tions.

NOTE: Contacts are shown in stand-by mode and will

transfer in alarm condition.

Wire connections are made by stripping about 3⁄8inch of

insulation from the end of the wire, sliding the bare end of

the wire under the clamping plate, and tightening the

clamping plate screw.

Tamper-resistance Feature

This detector includes a tamper-resistant feature that pre-

vents removal of the detector without the use of a tool. To

make the detector tamper-resistant, break off the smaller

tab at the scribed line on the Tamper Resistant Tab, on the

detector mounting bracket (see Figure 2), then install the

detector. To remove the detector from the bracket once it

has been made tamper-resistant, use a small screwdriver to

depress the tamper-resistant tab located in the slot on the

mounting bracket and turn the detector counterclockwise

for removal.

Installation

Remove power from initiating-device circuits before

installing detectors.

WARNING

TAMPER

RESISTANT

TAB

TO MAKE DETECTOR TAMPER RESISTANT,

BREAK OFF TAB EXTENSION

AT SCRIBED LINE

Figure 1. Flush mounting of 2412/2424 smoke

detector on 31⁄2inch and 4-inch octagonal box:

Figure 2. 2412/2424 smoke detector mounting

bracket:

COMMON

N/O

N/C

AUXILIARY

CONTACTS

FORM C

456

POWER

ALARM

CONTACTS

FORM A

N/O

A78-1811-00

COMMON

N/O

N/C

(OPTIONAL)

RELEASING

DEVICE

456

+–

COMMON

N/O

N/C

(OPTIONAL)

RELEASING

DEVICE

456

EOL

POWER

SUPERVISION

RELAY

MODULE

A77-716B

SUGGESTED

EOL

RESISTOR

CLASS A OPTIONAL WIRING

INITIATING

LOOP

POWER

DETECTORS

UL LISTED

COMPATIBLE

CONTROL

PANEL

–

Figure 3. Wiring diagram for 2412/2424 series smoke detector used with 4-wire control panel:

A78-1554-01

D400-06-00 3 I56-286-04R

1. Wire detector per installation guidelines.

2. Line up arrows on the detector with arrows on the

mounting bracket.

3. Turn the detector clockwise until the detector clicks into

place.

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

the control unit.

5. Test the detector as described under TESTING.

6. Reset the detector at the System Control Panel.

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

Dust covers provide limited protection against airborne

dust particles during shipping. Dust covers MUST be

removed before the smoke detectors can sense smoke.

Remove sensors before beginning heavy remodeling or

construction.

Testing

Before testing, notify the proper authorities that the smoke

detector 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.

Before testing the detector, look for the presence of the

flashing LED. If it does not flash, power has been lost to the

detector (check the wiring), or it is defective (return for

repair).

Detectors must be tested after installation and following

periodic maintenance. The 2412 and 2424 may be tested as

follows:

A. Recessed Test Switch

1. A test switch is located on the detector housing (see

Figure 4).

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

maximum diameter tool.

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

B. Calibrated Test Card (Model R59-18-00)

CAUTION

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

A78-1393-00

1. Remove the detector cover by placing a small-bladed

screwdriver in the side slot of the detector cover,

twisting slightly until the cover can be turned coun-

terclockwise for removal.

2. Insert the NO ALARM end of the test card fully into

the test slot (see Figure 5), then slide it counterclock-

wise until it stops.

3. The detector should not alarm after 20 seconds.

4. Remove the test card by sliding it clockwise before

removing, then insert the ALARM end.

5. The LED should latch on within 20 seconds, indicat-

ing alarm and annunciating the panel.

6. Put the cover back by gently rotating it clockwise

until it locks in place.

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

The MOD400R is used with an analog or digital volt-

meter to check the detector sensitivity as described in

the MOD400R manual.

D. Aerosol Generator (Gemini 501)

Set the generator to represent 4%/Ft. to 5%/Ft. obscu-

ration as described in the Gemini 501 manual. Using the

bowl shaped applicator, apply aerosol until unit alarms.

Detectors that fail these tests should be cleaned as

described under MAINTENANCE and retested. If the

detectors still fail these tests, they should be returned for

repair.

E. Direct Heat Test (Models 2412TH & 2424TH only)

To test the bi-metallic thermal collector on the Models

2412TH and 2424TH, use a low powered heat gun or

blow dryer, aiming the heat source across the detector.

Hold the heat source about 12 inches (30 cm) from the

detector to avoid damaging the plastic. When the heat

rises to greater than 135°F, the detector will latch in

alarm. After the test, the bi-metallic collector will self-

restore.

Notify the proper authorities that the system is back on

line when tests are complete.

D400-06-00 4 I56-286-04R

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 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

Department, 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,

modifications, or alterations occurring after the date of manufacture. In no

case shall the Company be liable for any consequential or incidental dam-

ages for breach of this or any other Warranty, expressed or implied what-

soever, 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 which vary from state to state.

REMOVABLE COVER

CLEANABLE SCREEN

P/N RS24 (W/O THERMAL)

RS24T (W/THERMAL)

TEST SLOT

VANED CHAMBER

A78-1390-00

Maintenance

NOTE: Before removing the detector cover, notify the

proper authorities that the smoke detector system

is undergoing maintenance, and therefore the sys-

tem will be temporarily out of service. Disable the

zone or system undergoing maintenance to prevent

unwanted alarms.

1. Remove the detector cover by placing a small-bladed

screwdriver in the side slot of the detector cover, twist-

ing it slightly until the cover can be turned counter-

clockwise for removal.

2. Vacuum the screen carefully without removing it. If fur-

ther cleaning is required, continue with step 3, other-

wise skip to step 6.

3. Remove the screen by pulling it straight out (see Figure

5). Vacuum the inside.

4. Clean the vaned chamber piece by vacuuming or blow-

ing out dust and particles.

5. To replace the screen, orient it so that the arrow on top

aligns with the test module socket of the detector.

Carefully push the screen onto the base, making sure it

fits tightly to the chamber.

6. Replace the cover by gently rotating it clockwise until it

locks in place.

7. Notify the proper authorities the system is back on line.

Figure 5. Removal of cover and screen for cleaning:

Please refer to insert for the Limitations of Fire Alarm Systems

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