System Sensor B404B User manual

D450-04-00 1 I56-375-04R

B404B Plug-in Detector Base

For use with 1451, 2451, AND 2451TH detectors

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. This man-

ual provides detailed information on detector spacing,

placement, zoning, wiring, and special applications, and is

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.)

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 should be cleaned at least once a year.

Specifications

Base Diameter: 6.2 inches (15.7 cm)

Base Height: 0.95 inches (2.9cm)

Weight: 0.6 lb. (260 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

31⁄2-inch 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

Electrical Ratings - includes base and detector

System Voltage: 120 VAC, 60 Hz

Relay Contact Ratings

Resistive or Inductive (60% power factor) load

Form A: 2.0A @ 30VAC/DC

Form C: 2.0A @ 30VAC/DC

0.6A @ 110VDC

1.0A @ 125VAC

(If used, the RA400 Remote Lamp operates within the specified detector system voltage.)

Start-up Time: 36.0 Seconds maximum

(After 60 second reset)

General Description

The B404B detector base is designed for use with System

Sensor model 2451 and 2451TH photoelectronic and 1451

ionization detector heads. The capability of plugging these

detectors into a variety of special bases makes them more

versatile than equivalent direct-wired models. Refer to the

System Sensor catalog for other available plug-in bases.

The B404B base is intended for use in 4-wire systems with

terminals provided for power, remote annunicator, and

relay connections. This base also contains a resistor to pro-

vide current limiting in the alarm state.

D450-04-00 2 I56-375-04R

Base Terminals

No. Function

1Remote Annunciator (+)

2Test Coil (+)

3Not used

4Remote Annunciator (–)

5RTC(–)

6 N.O. Supervisory Relay

7 N.O Form A Contacts

8N.O. Alarm Relay

9N.O. Form A

10 C. Initiation

11 C. Contacts

12 N.O. Alarm Relay

13 N.C. Form C

14 C. Auxiliary Contacts

Mounting

The 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 the base, remove the decorative

ring by rotating it in either direction to unhook the snaps

before separating the ring from the base. Use the screws

supplied with the junction box to attach the base to the box

through the appropriate mounting slots in the base.

Position the decorative ring around the base and rotate it in

either direction until the ring snaps into place (please see

Figure 2).

Installation Guidelines

All wiring must be installed in compliance with the

National Electrical Code, all applicable local codes, and

any special requirements of the authority having jurisdic-

tion, 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.

For signal wiring (the wiring between interconnected detec-

tors), it is recommended that the wire be no smaller than 16

gauge (1.5 square mm), and that two- or three-conductor

wire be no smaller than 18 gauge (1.0 square mm). For best

performance, alarm loop conductors should be installed in

separate grounded conduit or shielded cable to protect the

alarm loop from extraneous electrical interference.

Smoke detectors and alarm systems 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.

}

A78-1175-01

Figure 2. Mounting base to box:

SNAP ON

DECORATIVE

RING

SCREWS (NOT

SUPPLIED)

DETECTOR

BASE

BOX (NOT

SUPPLIED)

SHORTING

SPRING

Figure 1. Base terminals:

D450-04-00 3 I56-375-04R

89101112

REMOTE

ANNUNCIATOR

ALARM INITIATION LOOP

RELEASING

DEVICE

–

CONTROL

PANEL

BLACK LEADS

TRANSFORMER

PRIMARY

120

VAC

(+)

(–)

89101112

REMOTE

ANNUNCIATOR

RELEASING

DEVICE

–

120

VAC

(+)

(–)

EOL

SPECIFIED

BY PANEL

MANUFACTURER

CONTROL

PANEL

SUPERVISORY

RELAY

ALARM

RELAY

SUPERVISORY

RELAY

ALARM

RELAY

EOL

SPECIFIED

BY PANEL

MANUFACTURER

NOTE:ABOVE DIAGRAM SHOWS NFPA REQUIRED WIRING OF SUPERVISED

SYSTEMS. SCHEMATIC SHOWN BELOW FOR REFERENCE.

Figure 3. Typical wiring diagram for 120VAC detector systems:

Locate installations where normal ambient temperatures do

not exceed 100°F.

Wiring Instructions

NOTE: Refer to the manufacturer’s instructions for releas-

ing device wiring.

NOTE: To ensure that electrical connections are super-

vised, do NOT loop wires under terminals 8, 9, 10,

and 11. Cut the wire at each terminal.

To make electrical connections, strip approximately 3⁄8"

(1 cm) insulation from the end of each wire, slide the bare

wire end under the clamping plate, and tighten the clamp-

ing plate screw. Use the strip gauges molded into the inside

and underside of the base for ease of wiring to terminals 1

and 4, and to terminals 6 through 14, respectively.

The zone wiring of the detector base should be checked

before installing the smoke detector heads. The base con-

tains a built-in shorting spring to make this possible. After

the detector base is wired and mounted to an electrical box,

position the shorting spring against terminal 3. This tem-

porary connection energizes the supervisory relay and per-

mits the wiring of the loop to checked for continuity.

After all detector bases have been mounted, wired, and the

wiring checked, install the detector heads. The shorting

spring in the base automatically disengages 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.

Tamper-resistance Feature

This detector base can be made tamper resistant so it can-

not be removed without the use of a tool. To make the base

tamper resistant, simply break off the tab on the base (see

Figure 4A), before installing the detector.

D450-04-00 4 I56-375-04R

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, unrea-

sonable use, modifications, or alterations occurring after the date of man-

ufacture. 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.

Figure 4A. Activating tamper-resistance feature: Figure 4B. Removing detector head from 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.

A78-1175-03

To remove the detector from the base after it has been

made tamper resistant, insert a small screwdriver (please

see Figure 4B) into the small hole and press the plastic

lever away from the detector. Rotate the detector counter-

clockwise and remove.

NOTE: Head removal after activating the tamper-resist-

ance feature first requires removal of the decora-

tive ring.

Please refer to insert for the Limitations of Fire Alarm Systems

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