I56-0375
I56-0375-005R
INSTALLATION AND MAINTENANCE INSTRUCTIONS
3825 Ohio Avenue, St. Charles, Illinois 60174
1-800-SENSOR2, FAX: 630-377-6495
www.systemsensor.com
B404B Plug-in Detector Base
For use with 1451, 2451, AND 2451TH detectors
Specifications
Base Diameter:
Base Height:
Weight:
Mounting:
6.2 in (15.7 cm)
0.95 in (2.9cm)
0.6 lb (260 g)
4-inch square box with or without plaster ring, minimum depth 1.5 in; 4-inch octagon box, minimum depth 1.5 in;
31⁄2-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 Remote Annunciator and RTC operates within the specified detector system voltage)
Start-up Time (after 60 second reset): 36.0 Seconds maximum
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.)
For signal wiring (the wiring between interconnected detectors), 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.
NOTICE: This manual should be left with the owner/user of this equipment.
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.
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.
Locate installations where normal ambient temperatures do not exceed 100°F.
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.
Figure 1. Base terminals:
24VDC/24VAC
TERMINALS
7
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
6
STRIP GAUGE
2
3
1
SHORTING
SPRING
4
8
9
BASE TERMINALS
NO.
FUNCTION
NO.
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
FUNCTION
6
C.
Supervisory Relay
13
N.C.
Form C
7
N.O.
Form A Contacts
14
C.
Auxiliary Contacts
TAMPER
RESISTANT TAB
12
13 14
C1025-00
Figure 2. Mounting base to box:
SNAP ON
DECORATIVE
RING
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.
SHORTING
SPRING
SCREWS
(NOT SUPPLIED)
DETECTOR
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 having 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.
D450-04-00
5
10
11
BOX
(NOT SUPPLIED)
C0503-00
1
I56-0375-005R
Figure 3. Typical wiring diagram for 120VAC detector systems:
(+)
(+)
REMOTE
3
BLACK LEADS
TRANSFORMER
PRIMARY
2
1
120
VAC
CONTROL
PANEL
6
7
RELEASING
DEVICE
4
5
10
8 9
3
1
6
120
VAC
7
RELEASING
DEVICE
4
2
14
13
12
11
REMOTE
(–) ANNUNCIATOR
(–) ANNUNCIATOR
5
10
8 9
14
13
12
11
EOL
ALARM INITIATION LOOP
NOTE: ABOVE DIAGRAM SHOWS NFPA REQUIRED WIRING OF SUPERVISED SYSTEMS.
SCHEMATIC SHOWN BELOW FOR REFERENCE.
SUPERVISORY
RELAY
SPECIFIED BY PANEL
MANUFACTURER
SUPERVISORY
RELAY
EOL
CONTROL
PANEL
ALARM
RELAY
ALARM
RELAY
C0564-00
Wiring Instructions
NOTE: Refer to the manufacturer’s instructions for releasing device wiring.
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 counterclockwise
and remove.
NOTE: To ensure that electrical connections are supervised, 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 inch (1 cm) insulation
from the end of each wire, slide the bare wire end under the clamping plate,
and tighten the clamping 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.
NOTE: Head removal after activating the tamper-resistance feature first requires removal of the decorative ring.
Figure 4A. Activating tamper-resistance feature:
PLASTIC LEVER
The zone wiring of the detector base should be checked before installing the
smoke detector heads. The base contains 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 temporary connection energizes the supervisory relay and permits the wiring of the loop to
checked for continuity.
USE S
PLAS
BREAK TAB AT DOTTED LINE BY
TWISTING TOWARD CENTER OF BASE
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.LEVER
DO NOT remove the
PLASTIC
shorting spring since it reengages as the detector head is turned into the base,
completing the circuit.
C0130-00
Figure 4B. Removing detector head from base:
USE SMALL-BLADED SCREWDRIVER TO PUSH
PLASTIC LEVER IN DIRECTION OF ARROW
Tamper-resistance Feature
AT DOTTED
LINE BY
This detector base can be made tamper resistant BREAK
so it TAB
cannot
be removed
TWISTING TOWARD CENTER OF BASE
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.
C0130-00
Please refer to insert for the Limitations of Fire Alarm Systems
Three-Year Limited Warranty
Repair Department, RA #__________, 3825 Ohio Avenue, St. Charles, IL 60174. Please
System Sensor warrants its enclosed smoke detector base to be free from defects in mainclude a note describing the malfunction and suspected cause of failure. The Company
terials and workmanship under normal use and service for a period of three years from
shall not be obligated to repair or replace units which are found to be defective because
date of manufacture. System Sensor makes no other express warranty for this smoke
of damage, unreasonable use, modifications, or alterations occurring after the date of
detector base. No agent, representative, dealer, or employee of the Company has the aumanufacture. In no case shall the Company be liable for any consequential or incidental
thority to increase or alter the obligations or limitations of this Warranty. The Company’s
damages for breach of this or any other Warranty, expressed or implied whatsoever, even
obligation of this Warranty shall be limited to the repair or replacement of any part of the
if the loss or damage is caused by the Company’s negligence or fault. Some states do not
smoke detector base which is found to be defective in materials or workmanship under
allow the exclusion or limitation of incidental or consequential damages, so the above
normal use and service during the three year period commencing with the date of manulimitation or exclusion may not apply to you. This Warranty gives you specific legal
facture. After phoning System Sensor’s toll free number 800-SENSOR2 (736-7672) for a
rights, and you may also have other rights which vary from state to state.
Return Authorization number, send defective units postage prepaid to: System Sensor,
D450-04-00
2
I56-0375-005R
©2007 System Sensor
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