System Sensor B524BI User Manual
INSTALLATION AND MAINTENANCE INSTRUCTIONS
B524BI and B224BI Plug-in Isolator
Detector Bases
For use with the following smoke detectors:
In US: B524BI: 1551, 2551, 2551T, 5551, 5551R
B224BI: 1251, 2251, 3251
Specifications
Base Diameter: 6.2 inches (157 mm)
Base Height
B224BI: 1.2 inches (31 mm)
B524BI: 1.4 inches (36 mm)
Mounting: 4-inch square box with or without plaster ring, Min. depth - 1.5 inches (13 mm)
4-inch octagon box, Min. depth - 1.5 inches (13 mm)
3-1/2-inch octagon box, Min. depth - 1.5 inches (13 mm)
Operating Temperature Range: –10° C to +60°C (14°F to 140°F)
NOTE: Do not install in locations where normal ambient temperature
extends beyond 0° to 49° C (32° to 120° F)
Operating Humidity Range: 10% to 93% Relative Humidity (Non-condensing)
Electrical Ratings
Operating Voltage: 15 to 28 VDC
Current
Standard: 450µA Maximum
Alarm: 5mA Maximum
3825 Ohio Avenue, St. Charles, Illinois 60174
1-800-SENSOR2, FAX: 630-377-6495
A Division of Pittway
Before Installing
Please thoroughly read the system wiring and installation
manuals, and manual I56-407, Guide for Proper Use of Sys-
tem Smoke Detectors, which provides detailed information
on detector spacing, placement, zoning, and special applications. Copies of these manuals are available at no charge
from System Sensor.
NOTICE: This manual should be left with the owner/user
of this equipment.
IMPORTANT: The detectors used with these bases must be
tested and maintained following NFPA 72 requirements.
The detectors used with these bases should be cleaned at
least once a year.
General Information
Isolator bases prevent an entire communications loop from
being disabled when a short circuit occurs. They accomplish this by isolating that part of the loop containing the
short from the remainder of the circuit. These bases also
automatically restore the entire loop when the cause of the
short circuit is corrected. In general, up to 25 addressable
devices may be isolated between isolator bases. For the
purposes of determining the number of devices between
isolator bases, one 3251 is equivalent to 12 addressable devices. For example, (13) 2251’s and (1) 3251 may be
grouped between two isolator bases.
Mounting
The detector base mounts directly to 31/2- and 4-inch octagon and 4-inch square boxes, with or without a plaster
ring. To mount, remove the decorative ring by rotating it in
either direction to unhook the snaps. Then, separate the
ring from the base. Install the base on the box, using the
screws supplied with the junction box and the appropriate
slots in the base. Replace the decorative ring on the base
and rotate it in either direction until the ring snaps in place
(see Figure 1).
D450-15-00 1 I56-725-04
Installation Guidelines
All wiring must be installed in compliance with all applicable 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 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 detectors), 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, crimping, or soldering, as appropriate, for a reliable connection.
Figure 1. Mounting base to electrical box:
SCREWS (NOT
SUPPLIED)
SNAP ON
DECORATIVE
RING
DETECTOR
BASE
Alarm system control panels have specifications for allowable loop resistance. Consult the control panel specifications for the total loop resistance allowed before wiring the
detector loops.
Check the zone wiring of all bases in the system before installing detectors. This includes checking the wiring for
continuity, correct polarity, ground fault testing, and performing a dielectric test.
Figure 2:
1 - COMM
IN (+)
TWISTED PAIR RECOMMENDED
2 - COMM
IN (–)
3 - COMM
OUT (+)
2 - COMM
OUT (–)
1(+) 2(–) 3(+) 4(S)
OTHER INTELLIGENT
DEVICES
(+)
(–)
(+)
(–)
BOX (NOT
SUPPLIED)
A78-1175-23
LISTED COMPATIBLE CONTROL PANEL
A78-1577-06
CLASS A OPTIONAL WIRING
D450-15-00 2 I56-725-04
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