System Sensor 6424 Projected Beam Type - Manual (Page 4)

Mounting Brackets
Install a ceiling or wall bracket for both the receiver and
transmitter so that when mounted, the receiver and the
transmitter will be at approximately the same height. Each
ceiling bracket is composed of two parts that should be
assembled with inside part between the ceiling and out-
side part as shown in Figure 5. The brackets should be
mounted so that the slot in the front of each bracket is
facing the other bracket. Mount the brackets only on solid
structures of the building. To avoid unwanted alarms due
to wall movement, do not mount to flexible walls, such as
sheet metal walls (see MOUNTING LOCATIONS). Mount
brackets with a separation of at least 30 feet but not more
than 330 feet.
Figure 6. Ceiling mount bracket assembly:
C0741-00
Concrete
or Brick
Good Mounting
Surface
Poor Mounting
Surface
Sheet
Metal
Poor Mounting
Surface
Good Mounting
Surface
Figure 5. Good and poor mounting surfaces:
C0540-00
Wiring Installation Guidelines
Always install all wiring in compliance with the National
Electrical Code, and/or the applicable local codes, and any
special requirements of the local authority having jurisdic-
tion. Proper wire gauges and suitable means for strain relief
should be used. The conductors used to connect beam
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.
Installation wire used for the beam detector shall be no
smaller than 18 gauge (1.0 square mm). For best sys-
tem performance, all wiring should be twisted pair and
installed in separate grounded conduit. Do NOT mix fire
system wiring in the same conduit as any other electrical
wiring. Shielded cable may be used to provide additional
protection against electrical interference.
When installing the beam smoke detector in applica-
tions where flexible conduit will be used the BMB Beam
Mounting Bracket kit must be installed with the cable
before wiring the unit, as per the instructions supplied
with the kit.
For wiring, first remove the pre-cut insulation from the con-
ductor to be connected, then use a wire nut to connect the
detector wire to the field wire. If the insulation has been
removed from any unused conductors, make sure they are
terminated properly to avoid short circuits. The transmit-
ter can be wired in one of two ways. Figure 7 shows the
transmitter permanently connected to the receiver. In this
case the transmitter receives its power along with com-
munication for the alignment aid through the connecting
pair of wires. Figure 8 shows an alternative wiring con-
figuration in which the transmitter receives its power from
a remote power source. Temporary wiring can be installed
for the communication needed for transmitter alignment
D400-18-00 4 I56-494-13R
PRINTED IN MEXICO