D450-03-00
1
I56-374-05R
B402B Plug-in Detector Base
For use with the following smoke detectors:
1451, 2451, and 2451TH
INSTALLATION AND MAINTENANCE INSTRUCTIONS
3825 Ohio Avenue, St. Charles, Illinois 60174
1-800-SENSOR2, FAX: 630-377-6495
Before Installing
Please read the System Sensor manual I56-407,
Guide for
Proper Use of System Smoke Detectors,
which provides
detailed information on detector spacing, placement, zon-
ing, wiring, and special applications. Copies of this manual
are available at no charge from System Sensor. (For instal-
lations 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 require-
ments. 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
3-1/2 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, Non-condensing
Electrical Ratings — includes base and detector
System Voltage:
24 VDC
Maximum Ripple Voltage:
4 Volts peak to peak
Start-up Capacitance:
0.02
µ
F Maximum
Standby Ratings:
20 VDC Minimum
29 VDC Maximum
120
µ
A Maximum
Alarm Ratings:
17 mA Minimum
36 mA Maximum
Reset Voltage:
1.4 VDC Minimum
Reset Time:
0.3 Seconds Maximum
(If used, the RA400 remote lamp operates within the specified
detector alarm currents.)
Start-up Time:
34.0 Seconds Maximum
Relay Contact Ratings
Resistive or Inductive (60% Power Factor):
Form A:
2.0A @ 30 VAC/DC
Form C:
2.0A @ 30 VAC/DC
0.6A @ 110 VDC
1.0A @ 125 VAC
General Description
The plug-in detector base B402B is used with System
Sensor model 2451 and 2451TH photoelectronic detector
heads, and model 1451 ionization detector head. The capa-
bility 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 B402B base is intended for use in 4-wire systems, with
screw terminals provided for power, remote annunciator,
and relay contact connections. These bases also contain a
resistor to provide current limiting in the alarm state.
