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Metasys 2412AT Manual

Direct 4-wire
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© 1995 Johnson Controls, Inc.
Code No. LIT-408155
Fire Initiating Devices and Notification Appliances Technical Manual 408
2412AT, 2424AT, and 2424AIT
Direct 4-Wire Smoke Detectors
Conventional Products Section
Technical Bulletin
Issue Date 1095
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Summary of Contents for Metasys 2412AT

  • Page 1: Table Of Contents

    Fire Initiating Devices and Notification Appliances Technical Manual 408 Conventional Products Section Technical Bulletin Issue Date 1095 2412AT, 2424AT, and 2424AIT Direct 4-Wire Smoke Detectors Introduction Page General Description Installation Procedures General Information Mounting Spacing Wiring Installation Guidelines Installation Tamper-Proof Feature...
  • Page 2 2 Conventional Products—2412AT, 2424AT, and 2424AIT Direct 4-Wire Smoke Detectors...

  • Page 3: Introduction

    Follow only those instructions that apply to the model you are installing. Before you install any 2412AT, 2424AT, and 2424AIT direct wire smoke detectors, read and be familiar with: System Sensor Guide for Proper Use of System Smoke Detectors...

  • Page 4: General Description

    UL Listed Description 4-wire control panels. The 2412AT operates at 12 VDC, and the 2424AT and 2424AIT operate at 24 VDC. The sensor in this detector operates on the light scattering principle and features a unique photo-optic sensing chamber that provides good smoke entry while minimizing the effects of ambient light.
  • Page 5 Photo Detector with Fixed 24 VDC 120 µA 43 mA Heat Sensor and Horn 2424AIT 4-wire Photo Detector with 24 VDC 120 µA 43 mA Isolated Heat Sensor and Horn Conventional Products—2412AT, 2424AT, and 2424AIT Direct 4-Wire Smoke Detectors 5...
  • Page 6 Fixed Temperature Alarm 135°F Point 4V Peak-to-Peak Ripple Startup Time 34 Seconds Reset Time 0.3 Seconds Relay-Characteristics One Form-A (SPST; NO) for Alarm Initiation 1.25 Ampere Contact at 30 VAC/DC Maximum Current 6 Conventional Products—2412AT, 2424AT, and 2424AIT Direct 4-Wire Smoke Detectors...

  • Page 7: Installation Procedures

    Figure 1: Flush Mounting of Detector on 4 Inch Octagon Box Tamper Resistant Tab mountbrk To make detector tamper-proof, break off tab extension at scribed line. Figure 2: Detector Mounting Bracket Conventional Products—2412AT, 2424AT, and 2424AIT Direct 4-Wire Smoke Detectors 7...

  • Page 8: Spacing

    (ID C ) C lass A R eturn Loop sm kw ire 5 Figure 3: Class A or Class B Wiring Diagram for 2412AT and 2424AT Detectors used with 4-Wire Control Panels 8 Conventional Products—2412AT, 2424AT, and 2424AIT Direct 4-Wire Smoke Detectors...

  • Page 9: Installation

    Be sure to remove dust covers from any sensors that were left in place during construction as part of returning the system to service. Conventional Products—2412AT, 2424AT, and 2424AIT Direct 4-Wire Smoke Detectors 9...

  • Page 10: Tamper-Proof Feature

    2. Turn the detector counterclockwise for removal. The tamper-proof feature may be defeated by breaking and removing the plastic lever from the base. However, this prevents using the feature again. 10 Conventional Products—2412AT, 2424AT, and 2424AIT Direct 4-Wire Smoke Detectors...

  • Page 11: Testing And Maintenance Procedures

    1. Push and hold the recessed test switch with a 0.1 inch maximum diameter tool. 2. The LED should latch within five seconds indicating alarm and annunciating the panel. 3. The horn should also sound. Conventional Products—2412AT, 2424AT, and 2424AIT Direct 4-Wire Smoke Detectors 11...
  • Page 12 Detectors that fail these tests should be cleaned as described in the Maintenance section of this technical bulletin and retested. If the detectors still fail these tests, they should be returned for repair. 12 Conventional Products—2412AT, 2424AT, and 2424AIT Direct 4-Wire Smoke Detectors...

  • Page 13: Maintenance

    8. Carefully push the screen into place, making sure it fits tightly to the chamber. 9. Replace the cover by gently rotating it clockwise until it locks in place. Conventional Products—2412AT, 2424AT, and 2424AIT Direct 4-Wire Smoke Detectors 13...
  • Page 14 Removable Head Cover Test Slot Cleanable Screen ..(P/N RS24T) ..Removal Slot covscr5 Figure 6: Removal of Cover and Screen for Cleaning 14 Conventional Products—2412AT, 2424AT, and 2424AIT Direct 4-Wire Smoke Detectors...

  • Page 15: Limitations Of Smoke Detectors

    Test your smoke detector system per NFPA 72-National Fire Alarm Code, or codes and standards specific to the country of installation, at least semiannually. Clean and take care of your smoke detectors regularly. Conventional Products—2412AT, 2424AT, and 2424AIT Direct 4-Wire Smoke Detectors 15...

  • Page 16: Limitations Of Sounders

    Controls Group FAN 408 507 E. Michigan Street Fire Initiating Devices and Notification Appliances Technical Manual P.O. Box 423 Printed in U.S.A. Milwaukee, WI 53201 16 Conventional Products—2412AT, 2424AT, and 2424AIT Direct 4-Wire Smoke Detectors...

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