System Sensor B402B User manual

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: [phone]
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 µF Maximum
Standby Ratings: 20 VDC Minimum
29 VDC Maximum
120 µA 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.

D450-03-00 2 I56-374-05R
Mounting
This detector base mounts directly to 31⁄2-inch and 4-inch
octagon boxes, and 4-inch square boxes (with or without
plaster). 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 slots in the base (see Figure 1). Position the
decorative ring around the base and rotate it in either direc-
tion until the ring snaps into place.
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
detectors), it is recommended that the wire be no smaller
than 18 gauge (1.0 square mm). The screws and clamping
plate in the base can accommodate wire sizes up to 12
gauge (2.5 square mm). For best system performance, the
power (+ and –) loop wire should be twisted pair and
installed in separate grounded conduit to minimize the
effects of electrical interference.
Smoke detectors and alarm system control panels have
specifications for allowable loop resistance. Read the man-
ual for the control to determine the total loop resistance
allowed before wiring the detector loops.
Locate installations where normal ambient temperature
does not exceed 100°F.
Wiring Instructions
Wire connections are made by stripping approximately
3/8" (1 cm) insulation from the end of each wire, sliding
the bare end of the wire under the clamp plate, and tight-
ening the clamping plate screw. Use the strip gauges mold-
ed into the inside and underside of the base for ease of
wiring to terminals 1 through 5 and to terminals 12 through
14, respectively.
The zone wiring of the detector base should be checked
before installing the smoke detector head. To make this
possible, this base contains a special-type shorting jumper.
After the detector base is wired and attached to the electri-
cal box, make sure that the shorting spring is in contact
with the base of terminal 3. This temporary connection
SNAP ON
DECORATIVE
RING
SCREWS (NOT
SUPPLIED)
DETECTOR
BASE
BOX (NOT
SUPPLIED)
SHORTING
SPRING
Figure 1. Mounting base to box:
shorts the positive-in and positive-out leads and permits
the wiring of the loop to be checked for continuity.
Once all the detector bases have been wired and mounted,
and the loop wiring has been checked, the detector heads
may be installed in the bases. The shorting spring in the
base will disengage automatically 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.
A78-1175-01

D450-03-00 3 I56-374-05R
For system supervision–DO NOT use looped wire under ter-
minals 2, 3, and 5. Break wire run to provide supervision
of system.
CAUTION
Figure 2. Typical wiring diagram:
NOTE: For wiring or releasing device, refer to manufac-
turer's installation instructions.

D450-03-00 4 I56-374-05R
© System Sensor 2001
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, representa-
tive, dealer, or employee of the Company has the authority to increase or
alter the obligations or limitations of this Warranty. The Company’s obli-
gation 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 materi-
als 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.
Tamperproof Feature
Do not use the tamperproof feature if the XR5 removal tool
is to be used.
This detector base can be made tamperproof to prevent the
removal of the detector head without the use of a tool. To
activate this feature, break off the tab on the detector base
as shown in Figure 3A, then install the detector. To remove
the detector from the base once the tamperproof feature
has been activated, place a small-bladed screwdriver into
CAUTION
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.
the small hole on the side of the base and push the plastic
lever away from the detector head (see Figure 3B). This
will allow the detector to be rotated counterclockwise for
removal.
NOTE: Head removal after the tamperproof feature has
been activated first requires removal of the decora-
tive ring.
The tamperproof feature may be defeated by breaking and
removing the plastic lever from the base; however, this pre-
vents ever using the feature again.
Figure 3A. Activating tamperproof feature: Figure 3B. Removing detector head from base:
A78-1175-03A A78-1175-03B
Please refer to insert for the Limitations of Fire Alarm Systems