System Sensor B524BI - Manual (Page 2)

D450-15-00 2 I56-725-04
Installation Guidelines
All wiring must be installed in compliance with all appli-
cable local codes and any special requirements of the local
authority having jurisdiction, using the proper wire sizes.
The conductors used to connect smoke detectors to control
panels and accessory devices should be color-coded to re-
duce 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 de-
tectors), it is recommended that the wire be no smaller
than 18 gauge (1.0 square mm). However, wire sizes up to
12 gauge (3.3 square mm) can be used with the base. The
use of twisted pair wiring or shielded cable for the power
(+ and –) loop is recommended to minimize the effects of
electrical interference.
NOTE: Detector head power is supplied by terminals 1(+)
and 2(-). Therefore, the head will be part of this
isolation group.
If shielded cable is used, the shield connection to and from
the detector must be continuous by using wire nuts, crimp-
ing, or soldering, as appropriate, for a reliable connection.
Alarm system control panels have specifications for allow-
able loop resistance. Consult the control panel specifica-
tions for the total loop resistance allowed before wiring the
detector loops.
Check the zone wiring of all bases in the system before in-
stalling detectors. This includes checking the wiring for
continuity, correct polarity, ground fault testing, and per-
forming a dielectric test.
SCREWS (NOT
SUPPLIED)
BOX (NOT
SUPPLIED)
DETECTOR
BASE
SNAP ON
DECORATIVE
RING
Figure 1. Mounting base to electrical box:
A78-1577-06
LISTED COMPATIBLE CONTROL PANEL
CLASS A OPTIONAL WIRING
TWISTED PAIR RECOMMENDED
(+)
(–)
(+)
(–)
1 - COMM
IN (+)
2 - COMM
IN (–)
3 - COMM
OUT (+)
2 - COMM
OUT (–)
OTHER INTELLIGENT
DEVICES
1(+) 2(–) 3(+) 4(S)
Figure 2:
A78-1175-23