Page 1: Table Of Contents
Fire Initiating Devices and Notification Appliances Technical Manual 408 Conventional Products Section Technical Bulletin Issue Date 1095 2412, 2412TH, 2424, and 2424TH Direct Wire Photoelectronic Smoke Detectors Introduction Page General Description Installation Procedures General Information Mounting Spacing Wiring Installation Guidelines Installation Tamper-Proof Feature Testing and Maintenance Procedures...
Page 2 2 Conventional Products—2412, 2412TH, 2424, and 2424TH Direct Wire Photoelectronic Smoke Detectors...
Page 3: Introduction
Introduction This document contains important information about installing and operating direct wire smoke detectors. These conventional detectors are manufactured by System Sensor for use with Johnson Controls systems. If you install this detector for someone else to use, you must leave a copy of this document with the user.
Page 4 Each detector includes a Light Emitting Diode (LED) that provides a local visual indication of the detector’s status. The LED blinks every ten seconds as an indication that power is applied to the detector and lights continuously in alarm. The detector has the provision for the connection of an optional model RA400Z remote annunciator.
Page 5 Table 2: Specifications Summary Specifications Diameter 5.5 in. (140 mm) Height 3.19 in. (81 mm) Add 0.5 in. (13 mm) for all models with a “T” suffix (i.e., 2400TH) Weight 0.7 lb (318 g) Operating Temperature Range Models 2412 and 2424--32 to 120°F (0 to 49°F) Models 2412TH and 2424TH-- 32 to 100°F (0 to 38°C) Operating Humidity Range...
Page 6 6 Conventional Products—2412, 2412TH, 2424, and 2424TH Direct Wire Photoelectronic Smoke Detectors...
Page 7: Installation Procedures
Installation Procedures This section contains installation information for 2412, 2412TH, 2424, General and 2424TH direct wire smoke detectors. Instructions are given for Information mounting the detector, and basic wiring information is provided. Each 2412 and 2424 detector is supplied with a mounting bracket kit that Mounting permits the detector to be mounted in either of two ways: directly to 3-1/2 inch (88.9 mm) or 4 inch (101.6 mm) octagonal box,...
Page 8: Spacing
NFPA-72-National Fire Alarm Code defines the spacing requirements for Spacing smoke detectors. Typically, this is 30 feet when the detectors are installed on a smooth ceiling. Room configuration and operating environment may require a reduction in the standard maximum 900 square foot coverage for each detector.
Page 9: Installation
Please note carefully the wiring diagram for a typical 4-wire detector system shown in Figure 4. Contacts are shown in standby mode and will transfer in alarm condition. P ower P ower to D etectors E O L P ower S upervision Relay M odule...
Page 10: Tamper-Proof Feature
Limiting Dust covers can be used to help limit dust entry to the detector, but they Exposure to Dust are not a substitute for removing the detector during building construction. If detectors are mounted in a construction area, with or without the dust cover in place, each detector should be thoroughly cleaned, inspected, and tested after construction is complete.
Page 11: Testing And Maintenance Procedures
Testing and Maintenance Procedures Before testing, notify the proper authorities that the smoke detector system Testing is undergoing maintenance and will be temporarily out of service. Disable the zone or system undergoing maintenance to prevent unwanted alarms. After a detector is set into alarm by one of the following test methods and the alarm activating device is removed from the detector, the system should be reset at the control panel before testing any additional detectors.
Page 12 5. Insert the ALARM end. 6. Check that the LED latches on within 20 seconds, indicating alarm and annunciating the panel. 7. Put the cover back by gently rotating it clockwise until it locks in place. L E D R ecessed T est S w itch P u sh recessed test switch with a 0 .1 in ch m ax.
Page 13 Direct Heat Test (Models 2412TH and 2424TH only) To test the bimetallic thermal collector on the models 2412TH and 2424TH, follow these instructions: 1. Use a low powered heat gun or blow dryer, and aim the heat source across the detector. 2.
Page 14: Maintenance
Detectors should be cleaned and tested after exposure to smoke or fire. Maintenance 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.
Page 15 R em ova b le H ead C over T est S lot C lean able S cree n P /N R S 2 4 (w/o T h erm al)..H ead C o ver V ane d Ch a m be r R em oval S lot c ov&...
Page 16: Limitations
This smoke detector is designed to activate and initiate emergency action, Limitations but will do so only when used in conjunction with other equipment. This detector is designed for installation in accordance with NFPA Standards 71 and 72. Smoke detectors cannot work without power. Alternating Current (AC) or Direct Current (DC) powered smoke detectors will not work if the power supply is cut off for any reason.

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