System Sensor B401B Manuale utente

D450-01-01 1 I56-298-09R

B401B Plug-in Detector Base

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,

Guide for Proper Use of System Smoke Detectors, which pro-

vides detailed information on detector spacing, placement,

zoning, wiring, and special applications. Copies of this man-

ual are available at no charge from System Sensor. (For instal-

lations in Canada, refer to CAN4-S524, Standard for the

Installation of Fire Alarm Systems, and CEC Part 1, Sec. 32.)

NOTICE: This manual should be left with the owner/user

of this equipment.

IMPORTANT: The detector used with this base must be

tested and maintained regularly following NFPA 72 require-

ments. The detector used with this base should be cleaned

at least once a year.

Specifications

Base Diameter: 6.2 inches (15.7 cm)

Base Height: 1.1 inches (2.8 cm)

Weight: 0.3 lb. (130 g)

Mounting: 4-inch square box with or without plaster ring. Min. Depth–1.5 inches

4-inch octagon box. Min. Depth–1.5 inches

31⁄2inch octagon box. Min. Depth–1.5 inches

Operating Temperature Range: 0° to +49°C (32° to 120°F)

Operating Humidity Range: 10% to 93% Relative Humidity, noncondensing

Electrical Ratings — includes base and detector

System Voltage: 12/24 VDC

Maximum Ripple Voltage: 4 Volts peak to peak

Start-up Capacitance: 0.02 µF Maximum

Standby Ratings: 8.5 VDC Minimum; 35 VDC Maximum

120 µA Maximum

Alarm Ratings: 4.2 VDC Minimum at 10 mA; 6.6 VDC Maximum at 100 mA

(Alarm current must be limited to 100 mA by the control panel. If used, the RA400

remote lamp operates within specified detector alarm currents.)

Reset Voltage: 2.5 VDC Minimum

Reset Time: 0.3 Seconds Maximum

Start-up Time: 34.0 Seconds Maximum

For use with the following smoke detectors:

1451, 2451, and 2451TH

General Description

The B401B plug-in detector base is used with System

Sensor model 2451 and 2451TH photoelectronic detector

heads and model 1451A ionization detector heads. The

capability of plugging these detectors into a variety of spe-

cial bases makes them more versatile than equivalent

direct-wired models. Refer to the System Sensor catalog for

other available plug-in detector bases.

This base is intended for use in 2-wire systems, with screw

terminals provided for power, ground, and remote annun-

ciator connections.

D450-01-01 2 I56-298-09R

Mounting

This detector base mounts directly to 31⁄2-inch and 4-inch

octagon boxes, and 4-inch square boxes (with or without

plaster rings). To mount, remove the decorative ring by

turning it in either direction to unhook the snaps, then sep-

arate the ring from the base.

Install the base to the box using the screws supplied with

the junction box and the appropriate mounting slots in the

base (see Figure 1). Place decorative ring onto base, then

turn in either direction until the ring snaps in place.

Installation Guidelines

All wiring must be installed in compliance with the

National Electrical Code and the local codes having juris-

diction. Proper wire gauges should be used. The conduc-

tors used to connect smoke detectors to control panels and

accessory devices should be color-coded to reduce the like-

lihood 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 18 gauge (1.0 square mm). Wire sizes up to 12 gauge

wire (2.5 square mm) may be used with the base. For best

system performance, the power (+) and (–) loop wires

should be twisted pair and installed in separate grounded

conduit to protect the loop from extraneous electrical inter-

ference.

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.

Locate installations where the normal ambient tempera-

tures do not exceed 100° F.

REMOTE

ANNUNCIATOR

REMOTE

ANNUNCIATOR

2-WIRE CONTROL PANEL

CLASS A OPTIONAL WIRING

Figure 2. Typical wiring diagram for 2-wire detector systems:

A78-1175-04

SNAP ON

DECORATIVE

RING

SCREWS (NOT

SUPPLIED)

DETECTOR

BASE

BOX (NOT

SUPPLIED)

SHORTING

SPRING

Figure 1. Mounting base to box:

A78-1175-01

D450-01-01 3 I56-298-09R

Wiring Instructions

For system supervision — For terminals 2, 3, and 4 do not

use looped wire under terminals. Break wire run to provide

system supervision of connections.

Wire connections are made by simply stripping insulation

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

under the clamping plate, and tightening the clamping

plate screw. Use the strip gauge molded into the base for

ease of wiring to terminals 1 through 4.

System Sensor smoke detectors and mounting bases are

marked with a compatibility identifier located as the last

digit of a five digit code stamped on the back of the prod-

uct. Connect detectors/mounting bases only to compatible

control units as indicated in System Sensor’s compatibility

chart which contains a current list of UL listed control units

and detector head/base combinations. A copy of this list is

available from System Sensor upon request.

The zone wiring of the detector base should be checked

before the detector heads are installed in them. To make

this possible, this base contains a special spring-type short-

ing jumper. After a detector base is properly wired and

mounted on an electrical box, make sure that the jumper

spring is in contact with the base of Terminal 3. This tem-

porary connection shorts the negative-in and negative-out

leads and permits the wiring of the loop to be checked for

continuity.

Once all the detector bases have been wired and mounted,

and the loop wiring has been checked, the detector heads

may be installed in the bases. The shorting spring in the

base will disengage automatically when the detector head

is removed from the base. DO NOT remove the shorting

spring since it reengages as the detector head is turned into

the base, completing the circuit.

CAUTION

Tamper-resistance Feature

Do not use the tamper-resistance feature if the XR2 removal

tool is to be used.

The tamper-resistant tab, in the detector mounting bracket,

can make the detector tamper-resistant by making it neces-

sary to use a small screwdriver or similar tool to detach the

detector from the bracket.

To make the detector tamper-resistant, use needle-nose pli-

ers to break the smaller tab at the scribed line on the tamp-

er-resistance tab. Figure 3A shows the location of this tab

on the detector mounting bracket. To remove a detector

from the bracket after it has been made tamper resistant,

use a small screwdriver or other similar tool, to depress the

tamper-resistance tab in the slot on the mounting bracket,

and rotate the detector counterclockwise (see Figure 3B).

NOTE:The decorative ring must be removed before the

smoke detector can be detached from the base

after the tamper-resistant capability is enabled.

The tamper-resistance feature can be defeated by breaking

and removing the plastic lever from the base. However, this

prevents ever using the feature again.

CAUTION

Figure 3A. Activating the tamper-resistance feature:

A78-1175-03

Figure 3B. Removing detector head from the base:

PLASTIC LEVER

BREAK TAB AT

DOTTED LINE BY

TWISTING TOWARD

CENTER OF BASE.

USE SMALL-BLADED

SCREWDRIVER TO

PUSH PLASTIC LEVER

IN DIRECTION OF

ARROW.

D450-01-01 4 I56-298-09R

Three-Year Limited Warranty

System Sensor warrants its enclosed smoke detector base 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 base. No agent, represen-

tative, 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 base 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 consequen-

tial 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 limita-

tion 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.

Please refer to insert for the Limitations of Fire Alarm Systems

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