INSTALLATION AND MAINTENANCE INSTRUCTIONS
3825 Ohio Avenue, St. Charles, Illinois 60174
B404BT Plug-in Detector Base
1-800-SENSOR2, FAX: 630-377-6495
Specifications
Base Diameter: 6.2 inches (15.7 cm)
Base Height: 1.1 inches (2.9cm)
Weight: 0.6 lb. (260 g)
Mounting: 4-inch square box without plaster ring. Minimum depth–1.5 inches
4-inch octagon box. Minimum 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: 24 VAC/DC, 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 Annunciator and RTC operates within the specified detec-
tor system voltage.)
Start-up Time: 36.0 Seconds maximum
(After 60 second reset)
A Division of Pittway
Before Installing
Please thoroughly read System Sensor’s 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.
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.
General Description
The B404BT 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 B404BT base is intended for
use in 4-wire systems with terminals provided for remote annunicator and relay connections.
Power
Wire leads are provided for 24 VAC/DC power operation.
D450-10-00 1 I56-530-03
Base Terminals
No. Function
1 Remote Annunciator (+)
2 Test Coil (+)
3 Not used
4 Remote Annunciator (-)
5 RTC (-)
6 N.O. Supervisory Relay
7 N.O Form A Contacts
8 N.O. Alarm Relay
9 N.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 4-inch octagon boxes
and 4-inch square boxes. 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.
}
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Figure 1. Base Terminals
Figure 2. Mounting Base to Box
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.
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 twoor 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.
SHORTING
SPRING
SNAP ON
DECORATIVE
RING
SCREWS (NOT
SUPPLIED)
DETECTOR
BASE
BOX (NOT
SUPPLIED)
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.
D450-10-00 2 I56-530-03
A78-1175-01
R
Figure 3. Typical Wiring Diagram for 24VAC rms/DC Detector Systems
W
APA451
N
–
W
N
–
APA451
RELEASING
DEVICE
14
13
12
24 VACrms/DC
11
CONTROL
PANEL
24 VACrms/DC
BLACK LEADS
TRANSFORMER
PRIMARY
ALARM INITIATION LOOP
4
3
2
5
1
6
10
7
9
8
NOTE: ABOVE DIAGRAM SHOWS NFPA REQUIRED WIRING OF SUPERVISED
SYSTEMS. SCHEMATIC SHOWN BELOW FOR REFERENCE.
SUPERVISORY
RELAY
CONTROL
PANEL
ALARM
RELAY
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.
RELEASING
3
2
6
7
SUPERVISORY
RELAY
ALARM
RELAY
4
5
1
10
9
8
DEVICE
14
13
12
11
EOL
SPECIFIED
BY PANEL
MANUFACTURE
EOL
SPECIFIED
BY PANEL
MANUFACTURER
A78-1577-09
shorting spring since it reengages as the detector head is
turned into the base, completing the circuit
Tamper-resistance Feature
This detector base also includes an optional tamper-resistant feature that when activated prevents removal of the
detector without the use of a tool.
To make electrical connections, strip approximately 3/8" (1
cm) insulation from the end of each wire, slide the bare
To make the base tamper resistant, simply break off the tab
on the base (see Figure 4A), before installing the detector.
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.
To remove the detector from the base after it has been
made tamper resistant, insert a small screwdriver (see Fig-
ure 4B) into the small hole and press the plastic lever away
from the detector. Rotate the detector counterclockwise
and remove.
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,
NOTE: Head removal after activating the tamper-resis-
tance feature first requires removal of the decorative ring.
position the shorting spring against terminal 3. This temporary connection energizes the supervisory relay and permits the wiring of the loop to be 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
D450-10-00 3 I56-530-03
Figure 4A. Activating Tamper-Resistance Feature Figure 4B. Removing Detector Head from Base
BREAK TAB AT
PLASTIC LEVER
DOTTED LINE BY
TWISTING TOWARD
CENTER OF BASE.
The Limitations of Property Protection Smoke Detectors
The smoke detector used with this base is designed to activate and initiate emergency action, but will do so only when it is used in conjunction
with an authorized fire alarm system. This detector must be installed in
accordance with NFPA standard 72.
Smoke detectors will not work without power. AC or DC powered
smoke detectors will not work if the power supply is cut off.
Smoke detectors will not sense fires which start where smoke does not
reach the detectors. Smoldering fires typically do not generate a lot of
heat which is needed to drive the smoke up to the ceiling where the
smoke detector is usually located. For this reason, there may be large delays in detecting a smoldering fire with either an ionization type detector
or a photoelectric type detector. Either one of them may alarm only after
flaming has initiated which will generate the heat needed to drive the
smoke to the ceiling.
Smoke from fires in chimneys, in walls, on roofs or on the other side of a
closed door(s) may not reach the smoke detector and alarm it. A detector
cannot detect a fire developing on another level of a building quickly or at
all. For these reasons, detectors shall be located on every level and in
every bedroom within a building.
Smoke detectors have sensing limitations, too. Ionization detectors and
photoelectric detectors are required to pass fire tests of the flaming and
USE SMALL-BLADED
SCREWDRIVER TO
PUSH PLASTIC LEVER
IN DIRECTION OF
ARROW.
WARNING
smoldering type. This is to ensure that both can detect a wide range of
types of fires. Ionization detectors offer a broad range of fire sensing capability but they are somewhat better at detecting fast flaming fires than
slow smoldering fires. Photoelectric detectors sense smoldering fires better
than flaming fires which have little, if any, visible smoke. Because fires develop in different ways and are often unpredictable in their growth, neither type of detector is always best, and a given detector may not always
provide early warning of a specific type of fire.
In general, detectors cannot be expected to provide warnings for fires resulting from inadequate fire protection practices, violent explosions, escaping gases which ignite, improper storage of flammable liquids like
cleaning solvents which ignite, other similar safety hazards, arson, smoking in bed, children playing with matches or lighters, etc. Smoke detectors
used in high air velocity conditions may have a delay in alarm due to dilution of smoke densities created by frequent and rapid air exchanges. Additionally, high air velocity environments may create increased dust
contamination, demanding more frequent maintenance.
Smoke detectors cannot last forever. Smoke detectors contain electronic
parts. Even though smoke detectors are made to last over 10 years, any
part can fail at any time. Therefore, smoke detectors shall be replaced after
being in service for 10 years. The smoke detector system that this detector
is used in must be tested regularly per NFPA 72. This smoke detector
should be cleaned regularly per NFPA 72 or at least once a year.
A78-1175-03
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, representative, 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, unreasonable
use, modifications, or alterations occurring after the date of manufacture.
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.
D450-10-00 4 I56-530-03
© System Sensor 1997
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