D450-04-00 1 I56-0375-006R
For use with 1451, 2451, AND 2451TH detectors
INSTALLATION AND MAINTENANCE INSTRUCTIONS
3825 Ohio Avenue, St. Charles, Illinois 60174
1-800-SENSOR2, FAX: 630-377-6495
www.systemsensor.com
BEFORE INSTALLING
Please thoroughly read the System Sensor manual I56-407, Guide for Proper
Use of System Smoke Detectors. This manual provides detailed information on
detector spacing, placement, zoning, wiring, and special applications, and is
available at no charge from System Sensor. (For installation in Canada, refer to
CAN/ULC-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 should be cleaned at
least once a year.
GENERAL DESCRIPTION
The B404B detector base is designed for use with System Sensor model 2451
and 2451TH photoelectronic and 1451 ionization detector heads. The capabil-
ity of plugging these detectors into a variety of special bases makes them more
versatile than equivalent direct-wired models. Refer to the System Sensor cata-
log for other available plug-in bases.
The B404B base is intended for use in 4-wire systems with terminals provided
for power, remote annunciator, and relay connections. This base also contains
a resistor to provide current limiting in the alarm state.
BASE TERMINALS
NO. FUNCTION NO. FUNCTION
1 Remote Annunciator (+) 8 N.O. Alarm Relay
2 Test Coil (+) 9 N.O. Form A
3 Not Used 10 C. Initiation
4 Remote Annunciator (–) 11 C. Contacts
5 RTC (–) 12 N.O. Alarm Relay
6 C. Supervisory Relay 13 N.C. Form C
7 N.O. Form A Contacts 14 C. Auxiliary Contacts
MOUNTING
The detector base mounts directly to 3
1
⁄2-inch and 4-inch octagon boxes and
4-inch square boxes, with or without plaster rings. To mount the base, remove
the decorative ring by rotating it in either direction to unhook the snaps before
separating the ring from the base. Use the screws supplied with the junction box
to attach the base to the box through the appropriate mounting slots in the base.
Position the decorative ring around the base and rotate it in either direction
until the ring snaps into place (see Figure 2).
INSTALLATION GUIDELINES
All wiring must be installed in compliance with the National Electrical Code,
all applicable local codes, and any special requirements of the authority hav-
ing jurisdiction, using the proper wire size. 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.
SPECIFICATIONS
Base Diameter: 6.2 in (15.7 cm)
Base Height: 0.95 in (2.9cm)
Weight: 0.6 lb (260 g)
Mounting: 4-inch square box with or without plaster ring, minimum depth 1.5 in; 4-inch octagon box, minimum depth 1.5 in;
3
1
⁄2-inch octagon box, minimum depth 1.5 in
Operating Temperature Range: 0°C to 49°C (32°F to 120°F)
Operating Humidity Range: 10% to 93% Relative Humidity
Electrical Ratings (includes base and detector)
System Voltage: 120 VAC, 60 Hz
Relay Contact Ratings Resistive Load: Form A — 2.0A @ 30VAC/DC; Form C — 2.0A @ 30VAC/DC, 1.0A @ 125VAC
(If used, the RA400/RA100Z Remote Annunciator and RTC operates within the specified detector system voltage)
Start-up Time (after 60 second reset): 36.0 Seconds maximum
For signal wiring (the wiring between interconnected detectors), it is recom-
mended that the wire be no smaller than 16 gauge (1.5 square mm), and that
two- or three-conductor wire be no smaller than 18 gauge (1.0 square mm).
For best performance, alarm loop conductors should be installed in separate
grounded conduit or shielded cable to protect the alarm loop from extraneous
electrical interference.
Smoke detectors and alarm systems control panels have specifications for al-
lowable loop resistance. Consult the control panel manufacturer’s specifica-
tions for the total loop resistance allowed for the particular model control
panel being used before wiring the detector loops.
Locate installations where normal ambient temperatures do not exceed 100°F.
FIGURE 1. BASE TERMINALS:
BASE
TERMINALS
SHORTING
SPRING
STRIP GAUGE
1
2
3
5
4
TAMPER
RESISTANT TAB
6
7
8
9
10
11
12
13
14
TERMINALS
C1025-00
FIGURE 2. MOUNTING BASE TO BOX:
SNAP ON
DECORATIVE
RING
SCREWS
(NOT SUPPLIED)
DETECT
BASE
BOX
(NOT SUPPLIED)
SHORTING
SPRING
C0503-00
I56-0375-006R
B404B Plug-in Detector Base
(4 pages)
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