System Sensor B112LP User Manual
D150-03-00 1 I56-597-03R
B112LP Plug-in Detector Base
For use with the following smoke detectors:
IN US: 1151, 2151
IN CANADA: 1151A, 2151A
IN EUROPE: 1151E, 2151E
INSTALLATION AND MAINTENANCE INSTRUCTIONS
3825 Ohio Avenue
St. Charles, Illinois 60174
1-800-SENSOR2, FAX: 630-377-6495
Before Installing
Please thoroughly read the System Sensor manual I56-407,
Guide for Proper Use of System Smoke Detectors, which provides detailed information on detector spacing, placement,
zoning, wiring, and special applications. Copies of this
manual are 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 used with this base should be cleaned
at least once a year.
Specifications
Base Diameter: 6.2 inches (157 mm)
Base Height: 0.95 inches (24 mm)
Weight: 0.3 lb. (137 g)
Mounting: 4-inch square box with or without plaster ring. 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, Noncondensing
Electrical Ratings - includes base and detector
System Voltage: 24 VDC
Maximum Ripple Voltage: 4 Volts peak-to-peak
Start-Up Capacitance: 0.02µF 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
(The optional RA400Z operates within specified detector alarm currents.)
Start-up Time: 34.0 Seconds Maximum
Relay Contact Ratings:
Resistive or Inductive (60% Power Factor)
Form A: 2.0 A @ 30 VAC/DC
Form C: 2.0 A @ 30 VAC/DC
0.6 A @ 110 VDC
1.0 A @ 125 VAC
General Description
The Model B112LP detector base is designed for use with
System Sensor model 2151 photoelectronic and 1151 ionization detector heads. This four-wire base is equipped with
screw terminals for the connection of power, ground, and
an optional remote annunciator.
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 slots in the base (see Figure 1).
Position the decorative ring around the base and rotate it in
either direction until the ring snaps into place.
D150-03-00 2 I56-597-03R
Installation Guidelines
NOTE: Refer to the releasing device manufacturer’s
instructions for connection instructions.
Allowable loop resistance is an important specification for
control panels as well as for smoke detectors and their
bases. The alarm system cannot be expected to operate correctly if system components have incompatible allowable
loop resistances. Therefore, before beginning installation,
refer to the control panel manufacturer’s loop resistance
specification to ensure that it is listed as compatible with
the System Sensor base and smoke detector being installed.
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.
Wiring
For signal wiring (the wiring between interconnected
detectors), it is recommended that the wire be no smaller
than AWG 18. However, the screws and clamping plate in
the base can accommodate wire sizes up to AWG 12. The
use of twisted pair wiring for the power (+ and -) loop is
recommended to minimize the effects of electrical interference.
NOTE: To ensure that electrical connections are super-
vised, DO NOT loop wires under terminals 2, 3,
and 5 –break the wire at each terminal.
To make electrical connections, strip approximately 3/8" (1
cm) insulation from the end of each wire. Slide the wires
under the clamp plate and tighten the terminal screw.
If the base is being installed in a zoned system, check the
zone wiring before installing the smoke detector head. The
built-in shorting spring makes it convenient to do this.
After the detector base is wired and attached to the electrical box, position the shorting spring against terminal 3. Use
the slot in the retaining clip to hold the spring against the
terminal, as shown in Figure 1. This shorts the negative-in
and negative-out leads so that loop wiring can be tested for
continuity.
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
Figure 1. Mounting base to box:
Tamper-resistance Feature
NOTE: DO NOT use the tamper-resistance feature if the
System Sensor XR2 Removal Tool will be used to
remove detectors from the base.
This detector base can be made tamper resistant so the
detector cannot be removed without the use of a tool. To
make the base tamper-resistant, break off the smaller tab at
the scribed line on the tamper-resistance tab, on the detector mounting bracket (see Figure 3A), before installing the
detector.
To remove the detector from the base after it has been
made tamper resistant, remove the decorative ring by rotating it in either direction and pulling it away from the base.
Then, insert a small screwdriver into the notch, as indicated in figure 3B, and press the plastic lever toward the
mounting surface before rotating the detector counterclockwise for removal.
SHORTING
SPRING
SNAP ON
DECORATIVE
RING
SCREWS (NOT
SUPPLIED)
DETECTOR
BASE
BOX (NOT
SUPPLIED)
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