a reflection principle, a pane of glass perpendicular to the
line of sight between the detector and the reflector can
reflect the light beam from the transmitter to the receiver.
If this occurs, the detector will not be able to distinguish
these reflections from those of the reflector and the pro-
tected space will be compromised.
Panes of glass will also absorb some of the light as it
passes through it. This absorption of light will reduce the
acceptable installed distance between the detector and the
reflector.
In cases where operation through panes of glass cannot
be avoided some specific installation practices can help to
minimize the effects of the glass. These practices include:
avoid penetration of multiple panes of glass, position the
glass so that it is not perpendicular to the line of sight
between the detector and the reflector, (A minimum of 10°
off perpendicular should be considered), and make certain
that the glass is smooth, clear and mounted securely. The
complete reflector blockage test can be used to determine if
the installation is acceptable. See Testing and Maintenance
Section of this manual.
Where high ceilings (in excess of 30 feet or 9.1 meters)
are present additional beams may be required to detect
smoke at lower levels. See System Sensor’s Projected Beam
Detector Applications Guide for further explanation.
Wiring Installation Guidelines
Always install all wiring in compliance with the Canadian
Electrical Code, and/or the applicable local codes, and any
special requirements of the local authority having jurisdiction.
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 22 AWG (1.0 mm
2
). For best system perfor-
mance, 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 applications
where the head unit will be mounted to either a wall or
the ceiling using the multi-mount kit (BEAMMMK) flexible
conduit will be used. The surface mount kit (BEAMSMK)
and multi-mount kit (BEAMMMK) must be installed with
the cable before wiring the unit, according to the instruc-
tions supplied with the kit.
When the detector has been mounted over a recessed junction
box, all wiring should be routed out of the box and behind the
detector to the bottom of the detector where the terminal blocks
are located. When installing the wiring in the junction box be
sure to leave enough wire in the box to connect to the terminal
blocks. (Approximately 9″ (23cm) of wire outside of the junc-
tion box will be required for proper installation). All wiring to
the detector is done via pluggable terminal blocks. In order to
properly make electrical connections strip approximately
1
/
4
″
(6mm) of insulation from the end of the wire, sliding the bare
end of the wire under the clamping plate screw.
Figure 6 shows all the wiring connections to the transmitter/
receiver unit. Figure 7 shows the proper wiring diagram for
either class A or class B operation. Figure 8 shows the connec-
tions that are necessary when using one of the optional remote
test stations (RTS451 or RTS451KEYA). Figure 9 shows the
remote output for alarm indication.
WARNING: Disable the zone or system before applying
power to the beam detector to prevent unwant-
ed alarms. When applying power to the beam
detector before the alignment procedure has
been completed the detector may enter alarm
or fault.
Figure 6. Wiring Connections at Detector
SLC (
–)
SLC (+)
SLC (
–)
SLC (+)
RESET I NPUT
TEST INPUT
AUX
(
–)
REMOTE ALARM OUT
Not u
sed
Not u
sed
TEST OPTION (
–)
TEST OPTION (+)
T3
T2
T1
C0260-00
D400-74-00
6
I56-2542-00R
