System Sensor B401B User Manual
D450-01-01 1 I56-298-09R
B401B Plug-in Detector Base
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, which provides detailed information on detector spacing, placement,
zoning, wiring, and special applications. Copies of this manual are available at no charge from System Sensor. (For installations in Canada, refer to CAN4-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 requirements. The detector used with this base should be cleaned
at least once a year.
Specifications
Base Diameter: 6.2 inches (15.7 cm)
Base Height: 1.1 inches (2.8 cm)
Weight: 0.3 lb. (130 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, noncondensing
Electrical Ratings — includes base and detector
System Voltage: 12/24 VDC
Maximum Ripple Voltage: 4 Volts peak to peak
Start-up Capacitance: 0.02 µF Maximum
Standby Ratings: 8.5 VDC Minimum; 35 VDC Maximum
120 µA Maximum
Alarm Ratings: 4.2 VDC Minimum at 10 mA; 6.6 VDC Maximum at 100 mA
(Alarm current must be limited to 100 mA by the control panel. If used, the RA400
remote lamp operates within specified detector alarm currents.)
Reset Voltage: 2.5 VDC Minimum
Reset Time: 0.3 Seconds Maximum
Start-up Time: 34.0 Seconds Maximum
For use with the following smoke detectors:
1451, 2451, and 2451TH
General Description
The B401B plug-in detector base is used with System
Sensor model 2451 and 2451TH photoelectronic detector
heads and model 1451A 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 detector bases.
This base is intended for use in 2-wire systems, with screw
terminals provided for power, ground, and remote annunciator connections.
D450-01-01 2 I56-298-09R
Mounting
This 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, remove the decorative ring by
turning it in either direction to unhook the snaps, then separate 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 jurisdiction. Proper wire gauges should be used. 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). 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 interference.
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 temperatures do not exceed 100° F.
2
3
4
1
REMOTE
ANNUNCIATOR
2
3
4
1
REMOTE
ANNUNCIATOR
2-WIRE CONTROL PANEL
E
O
L
CLASS A OPTIONAL WIRING
Figure 2. Typical wiring diagram for 2-wire detector systems:
A78-1175-04
Figure 1. Mounting base to box:
A78-1175-01
SHORTING
SPRING
SNAP ON
DECORATIVE
RING
SCREWS (NOT
SUPPLIED)
DETECTOR
BASE
BOX (NOT
SUPPLIED)
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