System Sensor BEAM1224A Installation And Maintenance Instructions Manual Download Page 6

Page: 6 / 18

Light  sources  of  extreme  intensity  such  as  sunlight  and  hal-
ogen  lamps,  if  directed  at  the  receiver,  can  cause  a  dramatic
signal change resulting in fault and alarm signals. To prevent
this  problem  direct  sunlight  into  the  transmitter/receiver
unit  should  be  avoided.  There  should  be  a  minimum  of  10°
between  the  pathway  of  the  light  source  and  detector  and
the line of sight between detector and reflector.

Operation  of  the  detector  through  panes  of  glass  should
be  avoided.  Since  single  ended  beam  detectors  operate  on
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  mini-
mize  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  perpen-
dicular  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  instal-
lation  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 futher explanation.

Wiring Installation Guidelines

Always install all wiring in compliance with the Canadian Electrical
Code, and/or the applicable local codes, and any special require-
ments of the local authority having jurisdiction. Proper wire gauges
and suitable means for strain relief should be used. The conduc-
tors 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

). For best system performance, all wir-

ing  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 wring the
unit, according to the instructions 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  junction  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  approxi-
mately

″ (6mm) of insulation from the end of the wire, slid-

ing 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 connections that are neces-
sary when using one of the optional remote test stations (RTS451
or RTS451KEYA). Figure 9 shows the remote outputs for trouble
and alarm.

Figure 6. Wiring Connections at Detector

POWER OUT (

–)

POWER OUT (+)

POWER IN (

–)

POWER IN (+)

RESET I NPUT

TEST INPUT

AUX (

–)

REMOTE ALARM OUT