System Sensor B404B User manual

D450-04-00 1 I56-375-04R
B404B Plug-in Detector Base
For use with 1451, 2451, AND 2451TH detectors
INSTALLATION AND MAINTENANCE INSTRUCTIONS
3825 Ohio Avenue
St. Charles, Illinois 60174
1-800-SENSOR2, FAX: [phone]
Before Installing
Please thoroughly read the System Sensor manual I56-407,
Guide for Proper Use of System Smoke Detectors. This man-
ual 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 require-
ments. The detector should be cleaned at least once a year.
Specifications
Base Diameter: 6.2 inches (15.7 cm)
Base Height: 0.95 inches (2.9cm)
Weight: 0.6 lb. (260 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
Electrical Ratings - includes base and detector
System Voltage: 120 VAC, 60 Hz
Relay Contact Ratings
Resistive or Inductive (60% power factor) load
Form A: 2.0A @ 30VAC/DC
Form C: 2.0A @ 30VAC/DC
0.6A @ 110VDC
1.0A @ 125VAC
(If used, the RA400 Remote Lamp operates within the specified detector system voltage.)
Start-up Time: 36.0 Seconds maximum
(After 60 second reset)
General Description
The B404B detector base is designed for use with System
Sensor model 2451 and 2451TH photoelectronic and 1451
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 bases.
The B404B base is intended for use in 4-wire systems with
terminals provided for power, remote annunicator, and
relay connections. This base also contains a resistor to pro-
vide current limiting in the alarm state.

D450-04-00 2 I56-375-04R
Base Terminals
No. Function
1Remote Annunciator (+)
2Test Coil (+)
3Not used
4Remote Annunciator (–)
5RTC(–)
6 N.O. Supervisory Relay
7 N.O Form A Contacts
8N.O. Alarm Relay
9N.O. Form A
10 C. Initiation
11 C. Contacts
12 N.O. Alarm Relay
13 N.C. Form C
14 C. Auxiliary Contacts
Mounting
The 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 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 (please 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 having jurisdic-
tion, 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.
For signal wiring (the wiring between interconnected detec-
tors), it is recommended 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 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.
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A78-1175-01
Figure 2. Mounting base to box:
SNAP ON
DECORATIVE
RING
SCREWS (NOT
SUPPLIED)
DETECTOR
BASE
BOX (NOT
SUPPLIED)
SHORTING
SPRING
Figure 1. Base terminals:

D450-04-00 3 I56-375-04R
1
2
34
5
89101112
13
14
REMOTE
ANNUNCIATOR
ALARM INITIATION LOOP
RELEASING
DEVICE
–
67
CONTROL
PANEL
BLACK LEADS
TRANSFORMER
PRIMARY
120
VAC
(+)
(–)
1
2
34
5
89101112
13
14
REMOTE
ANNUNCIATOR
RELEASING
DEVICE
–
67
120
VAC
(+)
(–)
EOL
SPECIFIED
BY PANEL
MANUFACTURER
CONTROL
PANEL
SUPERVISORY
RELAY
ALARM
RELAY
SUPERVISORY
RELAY
ALARM
RELAY
EOL
SPECIFIED
BY PANEL
MANUFACTURER
NOTE:ABOVE DIAGRAM SHOWS NFPA REQUIRED WIRING OF SUPERVISED
SYSTEMS. SCHEMATIC SHOWN BELOW FOR REFERENCE.
Figure 3. Typical wiring diagram for 120VAC detector systems:
Locate installations where normal ambient temperatures do
not exceed 100°F.
Wiring Instructions
NOTE: Refer to the manufacturer’s instructions for releas-
ing device wiring.
NOTE: To ensure that electrical connections are super-
vised, do NOT loop wires under terminals 8, 9, 10,
and 11. Cut the wire at each terminal.
To make electrical connections, strip approximately 3⁄8"
(1 cm) insulation from the end of each wire, slide the bare
wire end under the clamping plate, and tighten the clamp-
ing plate screw. Use the strip gauges molded into the inside
and underside of the base for ease of wiring to terminals 1
and 4, and to terminals 6 through 14, respectively.
The zone wiring of the detector base should be checked
before installing the smoke detector heads. The base con-
tains a built-in shorting spring to make this possible. After
the detector base is wired and mounted to an electrical box,
position the shorting spring against terminal 3. This tem-
porary connection energizes the supervisory relay and per-
mits the wiring of the loop to checked for continuity.
After all detector bases have been mounted, wired, and the
wiring checked, install the detector heads. The shorting
spring in the base automatically disengages when the
detector head is removed from the base. DO NOT remove
the shorting spring since it reengages as the detector head
is turned into the base, completing the circuit.
Tamper-resistance Feature
This detector base can be made tamper resistant so it can-
not be removed without the use of a tool. To make the base
tamper resistant, simply break off the tab on the base (see
Figure 4A), before installing the detector.

D450-04-00 4 I56-375-04R
©2001 System Sensor
Three-Year Limited Warranty
System Sensor warrants its enclosed smoke detector base to be free from
defects in materials and workmanship under normal use and service for a
period of three years from date of manufacture. System Sensor makes no
other express warranty for this smoke detector base. No agent, represen-
tative, dealer, or employee of the Company has the authority to increase
or alter the obligations or limitations of this Warranty. The Company’s
obligation of this Warranty shall be limited to the repair or replacement of
any part of the smoke detector base which is found to be defective in
materials or workmanship under normal use and service during the three
year period commencing with the date of manufacture. After phoning
System Sensor’s toll free number 800-SENSOR2 (736-7672) for a Return
Authorization number, send defective units postage prepaid to: System
Sensor, Repair Department, RA #__________, 3825 Ohio Avenue, St.
Charles, IL 60174. Please include a note describing the malfunction and
suspected cause of failure. The Company shall not be obligated to repair or
replace units which are found to be defective because of damage, unrea-
sonable use, modifications, or alterations occurring after the date of man-
ufacture. In no case shall the Company be liable for any consequential or
incidental damages for breach of this or any other Warranty, expressed or
implied whatsoever, even if the loss or damage is caused by the Company’s
negligence or fault. Some states do not allow the exclusion or limitation of
incidental or consequential damages, so the above limitation or exclusion
may not apply to you. This Warranty gives you specific legal rights, and
you may also have other rights which vary from state to state.
Figure 4A. Activating tamper-resistance feature: Figure 4B. Removing detector head from base:
PLASTIC LEVER
BREAK TAB AT
DOTTED LINE BY
TWISTING TOWARD
CENTER OF BASE.
USE SMALL-BLADED
SCREWDRIVER TO
PUSH PLASTIC LEVER
IN DIRECTION OF
ARROW.
A78-1175-03
To remove the detector from the base after it has been
made tamper resistant, insert a small screwdriver (please
see Figure 4B) into the small hole and press the plastic
lever away from the detector. Rotate the detector counter-
clockwise and remove.
NOTE: Head removal after activating the tamper-resist-
ance feature first requires removal of the decora-
tive ring.
Please refer to insert for the Limitations of Fire Alarm Systems