System-sensor B401B Manuel d'utilisateur télécharger pdf (Page 2)

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

Mounting

This detector base mounts directly to 3

⁄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

1 2 3 4

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System-sensor B401B Manuel d'utilisateur Page 2

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