Metasys 2451 User manual

Fire Initiating Devices and Notification Appliances Technical Manual 408
Conventional Products Section
Technical Bulletin
Issue Date 1095
© 1995 Johnson Controls, Inc. 1
Code No. LIT-408133
Introduction Page 3
● General Description 4
Installation Procedures 7
● General Information 7
● Base Selection and Wiring Guide 7
● Spacing 8
● Installation 9
● Tamper-Proof Feature 10
Testing and Maintenance Procedures 11
● Testing 11
● Maintenance 14
● Limitations 16
2451 and 2451TH Conventional
Plug-In Photoelectronic Smoke Detectors

2 Conventional Products—2451 and 2451TH Conventional Plug-In Photoelectronic Smoke Detectors

Conventional Products—2451 and 2451TH Conventional Plug-In Photoelectronic Smoke Detectors 3
Introduction
This document contains important information about installing and
operating 2451 and 2451TH photoelectronic plug-in, conventional 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, leave a copy of this document with the user.
These instructions provide information regarding wiring, installation,
testing, and maintenance. Follow only those instructions that apply to the
model you are installing.
Before you install any 2451 and 2451TH photoelectronic plug-in,
conventional smoke detectors, read and be familiar with:
●the control panel system installation manual
●the requirements of the authority having jurisdiction
●National Fire Protection Association (NFPA)-72-National Fire
Alarm Code
●System Sensor Guide for Proper Use of System Smoke Detectors
Technical Bulletin in the Fire Initiating Devices and Notification
Appliances Technical Manual (FAN 408), which provides detailed
information on detector spacing, placement, zoning, wiring, and
special applications
●or, for non-United States installations, applicable codes and standards
specific to country and locality of installation

4 Conventional Products—2451 and 2451TH Conventional Plug-In Photoelectronic Smoke Detectors
!
CAUTION: Equipment hazard. Do not use in potentially
explosive atmospheres. Do not leave unused wires
exposed.
Model 2451 photoelectronic 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 control panels only.
Model 2451TH has the same specifications as Model 2451, with
the addition of a built-in fixed temperature 135°F (57°C) thermal
detection unit.
The capability of plugging models 2451 and 2451TH into a variety of
special bases makes them more versatile than equivalent direct-wired
models.
Two Light Emitting Diodes (LEDs) on each detector light provide a local
360° visible alarm indication. They blink every ten seconds indicating that
power is applied and the detector is operating properly. The LEDs light
continuously in alarm. The detector has the provision for the connection
of an optional model RA4007 remote annunciator. The RA4007 provides
a visual indication of an alarm in the connected detector, and mounts to a
single gang box.
These detectors have the latching alarm feature. The alarm can be reset
only by a momentary power interruption.
These detectors may be tested by activating the internal reed switch with a
magnet, or by inserting a calibrated test card in a test slot after removing
the detector cover.
Model 2451 has been approved for marine use in dry locations by
Underwriters Laboratories, Inc. (UL). The detector is to be used in dry
interior locations only.
General
Description

Conventional Products—2451 and 2451TH Conventional Plug-In Photoelectronic Smoke Detectors 5
Table 1: Specifications Summary
Size
Height 2.4 in. (61 mm)
Diameter 4.0 in. (101 mm)--model 2451
4.5 in. (114 mm)--model 2451TH
Specifications
Weight 0.5 lb (277 gm)
Operating Temperature Range 32 to 120°F (0 to 49°C)
Operating Humidity Range 10 to 93% Relative Humidity
Maximum Air Velocity 3000 ft/min (15 m/s)
Locking Alarm Reset by momentary power interruption
Fixed Temperature Thermal 135°F (57°C)--model 2451TH
Electrical Ratings
Minimum Standby Voltage 8.50 VDC
Maximum Standby Voltage 35 VDC
Minimum Voltage Required to Operate an
Accessory 4.20 VDC
Maximum Standby Current 0.12 mA
Maximum Equivalent Capacitance 0.00002 mF
Maximum Ripple 4000 m VAC
Maximum Startup Time 34 Seconds
Minimum Alarm Current 10 mA
Maximum Alarm Current 100 mA
Minimum Reset Voltage 2.50
Maximum Reset Time 0.30 Seconds
Accessories
Flanged Base B401B
Additional Bases B402B, B404B, B406B
Remote Annunciator RA400Z
Field Sensitivity Test MOD400R
Replacement Test Magnet M02-04-00
Retrofit Replacement Flange F110
Replacement Dust Cover Dust 12
Recess Mounting Kit
(for use with B401, B401R) RMK400
Surface Mounting Kit
(for use with B401, B401R) SMK400
End-of-Line Relay for Power Supervision A77-716B
Replacement Screen RS24 for the 2451
RS24T for the 2451TH

6 Conventional Products—2451 and 2451TH Conventional Plug-In Photoelectronic Smoke Detectors

Conventional Products—2451 and 2451TH Conventional Plug-In Photoelectronic Smoke Detectors 7
Installation Procedures
This section contains installation information for 2451 and 2451TH
photoelectronic plug-in smoke detectors. Instructions are given for
installing the detector, and basic wiring information is provided.
Refer to the plug-in detector bases technical bulletins in the Fire Initiating
Devices and Notification Appliances Technical Manual (FAN 408) for
base selection and wiring instructions.
System Sensor has a variety of detector bases available for use with this
smoke detector:
●2-wire applications with and without relays and/or current limiting
resistors
●4-wire and 120 VAC applications
Table 2: Bases Used with the 2451 and 2451TH
Model
Number Version Loop Type Current Limit
Resistor
Alarm
Contact
Type
Nominal
Voltage Current Draw on
Alarm
(mA)
B401B UL/ULC 2-wire* No — 12/24
VDC 10-100**
B402B UL/ULC 4-wire Yes Form-A and
Form-C 24 VDC 14-39
B404B UL/ULC 4-wire Yes Form A,
Form-C,
and Form-A
Supervisory
120 VAC 75 mA AC
Max.
B406B UL/ULC/
EN-54 2-wire* No Form-C 24 VDC 12-100**
* Functionality contingent on panel compatibility.
** Must be limited by control panel.
All bases are provided with screw terminals for power, ground, remote
annunciator connections, and relay contact connections, if applicable. The
electrical ratings for each detector-base combination are also included in
the base technical bulletins.
The conductors used to connect smoke detectors to control panels and
accessory devices should be color-coded to reduce the likelihood of wiring
errors. Incorrect connections can prevent a system from responding
properly in the event of a fire.
General
Information
Base Selection
and Wiring
Guide

8 Conventional Products—2451 and 2451TH Conventional Plug-In Photoelectronic Smoke Detectors
Note: Refer to the releasing device manufacturer’s installation instruction
for proper connections.
For Initiating Device Circuit (IDC) wiring (the wiring between
interconnected detectors), it is recommended that the wire be no smaller
than 18 American Wire Gauge (AWG) (1.0 square mm). However, the
screws and clamping plate can accommodate wire sizes up to 12 AWG
(3.3 square mm).
Smoke detectors and alarm system control panels have specifications for
allowable IDC wire type and maximum resistance. Consult the control
panel manufacturer’s specifications for the total IDC resistance allowed
for the control panel being used before wiring the detector IDCs.
Begin electrical connections by stripping about 3/8 inch insulation from
the end of the wire (use strip gauge molded in detector base). Then, slide
the bare end of the wire under the clamping plate and tighten the clamping
plate screw.
Note: Break the wire at each terminal to ensure that the connections are
supervised--do not loop the wire under the terminals.
This Not This
wirguide
Figure 1: Electrical Connections
Contacts are shown in standby mode and will transfer in alarm condition.
The detectors are marked with a compatibility identifier located as the last
digit of a five digit code stamped on the back of the product. Connect
detectors only to compatible control units as indicated in the Device
Compatibility Technical Bulletin in the Fire Management Accessories
Manual (FAN 445).
The National Fire Protection Association (NFPA) 72-National Fire Alarm
Code defines the spacing requirements for smoke detectors. Typically,
this is 30 foot centers for mounting (maximum of 21 foot radius of each
detector) when the detectors are installed on a smooth ceiling no higher
than a foot. Room configuration and operating environment may require a
reduction in the standard maximum 900 square foot coverage for
each detector.
Spacing

Conventional Products—2451 and 2451TH Conventional Plug-In Photoelectronic Smoke Detectors 9
!
WARNING: Shock hazard. Disconnect power from the
Initiating Device Circuits (IDC) before installing
detectors.
Wiring must conform to all applicable local codes, ordinances, and
regulations.
Verify that all detector bases are installed, that the IDCs have been tested,
and that the wiring is correct. Refer to detector base manual for testing
procedure.
1. Place the detector into the detector base.
2. Turn the detector clockwise until the detector drops into place.
3. Continue turning detector clockwise to lock it in place.
4. Enable the tamper-proof feature. For instructions see the
Tamper-Proof Feature section of this technical bulletin.
5. After all detectors have been installed, apply power to the control unit.
6. Test the detector using a calibrated aerosol generator, magnet, or test
card as described in the Testing section of this technical bulletin.
7. Reset the detector at the system control panel.
8. Notify the proper authorities that the system is back online.
Dust covers can be used to help limit dust entry to the detector, but they
are not a substitute for removing the detector during building construction.
Remove any dust covers before placing system in service.
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.
Installation
Limiting
Exposure to Dust

10 Conventional Products—2451 and 2451TH Conventional Plug-In Photoelectronic Smoke Detectors
This detector includes a tamper-proof feature that prevents removal of the
detector without the use of a tool.
To make the detector tamper-proof:
1. Break off the smaller tab at the scribed line on the tamper proof tab on
the detector mounting bracket.
2. Install the detector.
tm prprf
Plastic Lever
Break tab at
dotted line b
y
twistin
g
toward
center of base.
Figure 2: Activating the Tamper-Proof Feature
To remove the detector from the bracket once it has been made
tamper-proof:
1. Use a pocket screwdriver, or similar tool, and depress the
tamper-proof tab located in the slot on the mounting bracket.
2. Turn the detector counterclockwise until it separates from the base.
See the applicable detector base data for the location of the tamper-proof
break-off tab and the location of the tool insertion point.
remdetct
Use sm all-bladed
screwdriver to
push plastic lever
in direction of arrow.
Figure 3: Removing the Detector Head from the Base
The tamper-proof feature may be defeated by breaking and removing
the plastic lever from the base. However, this prevents using the
feature again.
Tamper-Proof
Feature

Conventional Products—2451 and 2451TH Conventional Plug-In Photoelectronic Smoke Detectors 11
Testing and Maintenance
Procedures
Before testing, notify the proper authorities that the smoke detection
system will be temporarily out of service while undergoing testing and
maintenance. Disable the zone, IDC, 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.
After testing is complete and the system is returned to its normal
configuration, notify the proper authorities that the system is again in service.
All detectors must be tested after installation and following periodic
maintenance. Testing methods must satisfy the authority having
jurisdiction. Detectors offer maximum performance when they are tested
and maintained in compliance with National Fire Protection Association
(NFPA) 72-National Fire Alarm Code.
Before testing the detector, check to ensure that the LEDs are blinking. If
they are not, the detector has lost power (check the wiring) or it is
defective (return it for repair).
Test Magnet (M02-04-00)
1. Place the magnet against the cover opposite the test module slot to
activate the test feature (Figure 1).
testswc4
LED
Test Module
Socket
Test Magnet
Painted
Surface
LED
Test
Magnet
Figure 4: Bottom and Side Views Showing Position of Test Magnet
2. The LEDs should latch on within five seconds indicating alarm and
annunciating the panel.
3. Reset the detector at the system control panel.
Testing
Testing the 2451

12 Conventional Products—2451 and 2451TH Conventional Plug-In Photoelectronic Smoke Detectors
Calibrated Test Card (R59-18-00)
1. Remove the detector cover by placing a small-bladed screwdriver in
the head cover removal slot of the detector cover (Figure 2), twisting
it 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
(Figure 2), then slide it counterclockwise until it stops.
3. Wait for at least 20 seconds. The detector should not alarm.
4. Remove the test card by sliding it clockwise before removing, then
insert the ALARM end.
5. Check that the LEDs 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.
Test Module (MOD400R)
The MOD400R is used with your Digital Multimeter (DMM) or voltmeter
to check the detector sensitivity as described in the MOD400R’s manual.
Aerosol Generator (Gemini 501)
1. Set the generator to represent 4%/ft to 5%/ft obscuration as described
in the Gemini 501 manual.
2. Use the bowl-shaped applicator to apply aerosol until unit alarms.
3. Clean detectors that fail these tests as described in the Maintenance
section of this technical bulletin, and retest.
4. Return the detectors for repair if they still fail these tests.
5. Notify the proper authorities that the system is back online.
The Gemini 501 Aerosol Generator is UL Listed, and can be ordered from:
Gemini Scientific Corporation
1122 Aster Avenue
Sunnyvale, CA 94086
Contact Gemini at [phone] or fax [phone].

Conventional Products—2451 and 2451TH Conventional Plug-In Photoelectronic Smoke Detectors 13
Direct Heat Test
To test the bimetallic thermal collector:
1. Aim a heat source, such as a low powered heat gun or blow dryer,
across the detector.
2. Hold the heat source about 12 inches (30 cm) from the detector to
avoid damaging the plastic.
3. When the temperature rises to greater than 135°F (57°C), the detector
should latch into alarm.
4. The bimetallic collector automatically resets after the test.
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.
After testing is complete, notify the proper authorities that the system is
back in service.
Testing the
2451TH

14 Conventional Products—2451 and 2451TH Conventional Plug-In Photoelectronic Smoke Detectors
It is recommended that the detector be removed from its mounting base to
facilitate easier cleaning.
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 IDC zone or system undergoing maintenance to
prevent unwanted alarms.
After maintenance and testing is complete and the system is returned to its
normal configuration, notify the proper authorities that the system is again
in service.
The detector is cleaned as follows:
1. Remove the detector cover by placing a small bladed screwdriver in
the head cover removal 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 (Figure 5).
4. Vacuum the inside.
5. Clean the vaned chamber piece by vacuuming or blowing out dust and
particles.
6. Insert the replacement screen. Orient it so that the arrow on top aligns
with the test module socket of the detector.
7. Carefully push the screen onto the base making sure it fits tightly to
the chamber.
8. Replace cover by gently rotating it clockwise until it locks in place.
9. Reinstall the detector.
10. Notify the proper authorities that the system is back online.
Maintenance
Cleaning the
Detector

Conventional Products—2451 and 2451TH Conventional Plug-In Photoelectronic Smoke Detectors 15
cov&scr5
Removable
Head Cover
Cleanable Screen
P/N RS24
(
w/o Thermal
)
RS24T
(
w/Thermal
)
TestSlot
Vaned Chamber
Head Cover
Removal Slot
Figure 5: Cleaning the 2451 and 2451TH Detectors

16 Conventional Products—2451 and 2451TH Conventional Plug-In Photoelectronic Smoke Detectors
This smoke detector is designed to activate and initiate emergency action,
but will do so only when used in conjunction with other equipment. This
detector is designed for installation in accordance with the National Fire
Protection Association (NFPA) 72-National Fire Alarm Code, or
equivalent codes and standards applicable to country of installation.
●Smoke detectors will not 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.
●Smoke detectors will not sense fires that start where smoke does not
reach the detectors. Smoke from fires in chimneys, in walls, on roofs,
or on the other side of closed doors may not reach the smoke detector
and alarm it.
●A detector may not detect a fire developing on another level of a
building. For this reason, locate detectors on every level of a
building.
●Smoke detectors have sensing limitations. Ionization detectors offer a
broad range fire-sensing capability, but they are better at detecting
fast, flaming fires than slow, smoldering fires. Photoelectronic
detectors sense smoldering fires better than flaming fires. Because
fires develop in different ways, and are often unpredictable in their
growth, neither type of detector is always best, and a given detector
may not always provide warning of a fire. In general, detectors
cannot be expected to provide warnings for fires resulting from
inadequate fire protection practices, violent explosions, escaping gas,
improper storage of flammable liquids like cleaning solvents, other
safety hazards, or arson.
This detector is UL Listed to operate in a maximum air velocity of
3000 ft./min. Air velocity, along with other factors, may affect
detector sensitivity. See the 1993 NFPA 72-National Fire Alarm
Code, Appendix B for information.
●Test your smoke detector system per NFPA 72-National Fire Alarm
Code, or equivalent codes and standards applicable to country of
installation, at least semiannually. Clean and take care of your smoke
detectors regularly. Taking care of the fire detection system you have
installed will measurably reduce your product liability risks.
Limitations
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