SS-450-002 1 I56-3736-001R
B224BI Plug-in Isolator
Detector Base
INSTALLATION AND MAINTENANCE INSTRUCTIONS
BEFORE INSTALLING
Please read the System Smoke Detector Applications Guide, which provides
detailed information on detector spacing, placement, zoning, wiring, and spe-
cial applications. Copies of this application guide are available from System
Sensor. NFPA 72 guidelines should be observed.
NOTICE: This manual should be left with the owner/user of this equipment.
IMPORTANT: The detectors used with these bases must be tested and main-
tained following NFPA 72 requirements. The detectors used with these bases
should be cleaned at least once a year.
GENERAL INFORMATION
The isolator base is intended for use in an intelligent system. Isolator bases
prevent an entire communications loop from being disabled when a short cir-
cuit 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.
B224BI TERMINALS
NO. FUNCTION
1. Positive (+) Comm. Line In
2. Negative (–) Comm. Line In and Out
3. Positive (+) Comm. Line Out
SPECIFICATIONS
Base Diameter: 6.85 in (17.4 cm)
Base Height: 1.61 in (4.1 cm)
Operating Temperature Range: Refer to applicable sensor Operating Temperature Range using the Base/Sensor Cross Reference Chart at systemsensor.com
Operating Humidity Range: 10% to 93% Relative Humidity (Non-condensing)
Electrical Ratings
Operating Voltage: 15 to 32 VDC
Standby Current: 450µA Maximum
Isolation Current: 15mA Maximum
MOUNTING
Mount the mounting plate directly to an electrical box. The plate will mount
directly to 4-inch square (with and without plaster ring), 4-inch octagon,
3
1
/2-inch octagon, single gang and double gang junction boxes.
1. Connect field wiring to terminals, as shown in Figure 3 and 4.
2. Attach the mounting plate to the junction box as shown in Figure 2.
3. To mount the base, hook the tab on the base to the groove on the mounting plate.
4. Then, swing the base into position to engage the pins on the product with
the terminals on the mounting plate.
5. Secure the base by tightening the mounting screws.
6. Install a compatible smoke detector as described in the installation manual
for the detector.
I56-3736-001R
3825 Ohio Avenue, St. Charles, Illinois 60174
1.800.SENSOR2; Fax: 630.377.6495
www.systemsensor.com
C1008-01
C0471-05
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 recom-
mended that the wire be no smaller than 18 AWG (0.823 square mm). How-
ever, wire sizes up to 12 AWG (3.31 square mm) can be used with the 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.
LISTED COMPATIBLE CONTROL PANEL
CLASS A OPTIONAL WIRING
(+)
(–)
(+)
(–)
2 - COMM IN (–)
1 - COMM IN (+)
3 - COMM OUT (+)
2 - COMM OUT (–)
OTHER
INTELLIGENT
DEVICES
C1003-01
MOUNTING
PLATE
BOX
(NOT SUPPLIED)
SCREWS
(NOT SUPPLIED)
FIGURE 3:
FIGURE 1: TERMINAL DESIGNATION:
2
3
FIGURE 2. MOUNTING BASE TO ELECTRICAL BOX:
(4 pages)
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