System Sensor 2412B, 2412THB, 2424, and 2424TH Product manual

INSTALLATION AND MAINTENANCE INSTRUCTIONS

2412B, 2412THB, 2424, and 2424TH

Direct Wire Photoelectronic

Smoke Detectors

3825 Ohio Avenue, St. Charles, Illinois 60174

1-800-SENSOR2, FAX: 630-377-6495 ww.systemsensor.com

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°C to +49°C (32°F 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

Supply Voltage: 11.3 20

DC (4V Maximum Ripple)

VDC Minimum

17 29

Reset Voltage: .73 .8

Standby Current: 120 120

Alarm Currents: 35 21.3

VDC Maximum

VDC Minimum

µA Maximum mA Minimum

77 40.6

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

mA Maximum

Start-up Time: 34 34

EOL Relay: A77-716 A77-716

S Maximum

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)

Before Installing

Please thoroughly read the System Sensor manual A05-

1003, Applications Guide for 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, Standard for the Installation of Fire Alarm Systems and CEC Part 1, Sec. 32.)

An LED on each detector lights to provide a local alarm indication. 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.

General Description

System Sensor 2412 and 2424 photoelectronic smoke detectors 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

Each detector contains one set of Form A contacts for connection to the alarm-initiating circuit, and one set of Form C auxiliary contacts. Supervision of detector power is accomplished 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 control panel’s alarm-initiating loop. A power failure or a break in the detector power loop de-energizes the EOL Module. 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.

The relay contacts open and trigger a trouble signal at the control panel.

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Figure 1. Flush mounting of 2412/2424 smoke detector on 3 1 ⁄

2

inch and 4-inch octagonal box:

Figure 2. 2412/2424 smoke detector mounting bracket: TAMPER

RESISTANT

TAB

S0168-00

Mounting

Each 2412 and 2424 detector is supplied with a mounting bracket kit that permits the detector to be mounted:

1. Directly to a 3 1 ⁄

2

inch or 4 inch octagonal, 1 1 ⁄

2

inch 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 installation 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 jurisdiction, 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.

TO MAKE DETECTOR TAMPER RESISTANT,

BREAK OFF TAB EXTENSION

AT SCRIBED LINE

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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 connections.

NOTE: Contacts are shown in stand-by mode and will transfer in alarm condition.

Wire connections are made by stripping about 3 ⁄

8

inch 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.

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 interference.

Tamper-resistance Feature

This detector includes a tamper-resistant feature that prevents 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.

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

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Installation mounting bracket.

place.

the control unit.

WARNING

Remove power from initiating-device circuits before installing detectors.

1. Wire detector per installation guidelines.

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

3. Turn the detector clockwise until the detector clicks into

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

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.

CAUTION

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.

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)

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 counterclockwise for removal.

2. Insert the NO ALARM end of the test card fully into the test slot (see Figure 5), then slide it counterclockwise 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, indicating alarm and annunciating the panel.

6. Put the cover back by gently rotating it clockwise until it locks in place.

unless the combination has been evaluated and found suitable for that purpose.

CAUTION

Smoke detectors are not to be used with detector guards

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).

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

The MOD400R is used with an analog or digital voltmeter 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. obscuration 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.

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

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D400-06-00 3 I56-286-05R

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 selfrestore.

Figure 5. Removal of cover and screen for cleaning:

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Notify the proper authorities that the system is back on line when tests are complete.

Maintenance

NOTE: Before removing the detector cover, notify the proper authorities that the smoke detector system is undergoing maintenance, and therefore the system 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, twisting it slightly until the cover can be turned counterclockwise for removal.

2. Vacuum the screen carefully without removing it. If further cleaning is required, continue with step 3, otherwise 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 blowing 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.

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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 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 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 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 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 which vary from state to state.

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©2004 System Sensor