Configuring
The
BX444-M
c
The
BX444-M
c
has
two
DIP
switches
on
the
PCB.
The
left
switch
is
used
to
control
the
sensor
connected
to
the
system.
The
right
switch
is
used
to
configure
the
controller
itself.
The
BX444-M
c
can
be
configured
to
provide
several
modes
of
operation. The
configurable
parameters
are:
Switch
1
on
any
of
the
1st
4
double
DIP
switches
Zone
ON
or
OFF
-
The
BX444-M
c
will
not
look
for
a
sensor
on
a
given
zone
if
the
switch
is
moved
to
the
OFF
position.
It
is
not
necessary
to
remove
the
return
cable
from
the
sensor.
Example
shows
Zone
1
On,
Zone
2
On,
Zone
3
Off,
Zone
4
On
Switch
2
on
any
of
the
1st
4
DIP
switches
Type
of
gas
to
be
sensed.
These
are
labelled
as
GAS
or
CO.
The
symbols
on
the
front
fascia
of
the
detector
are
EN
standard
symbols
and
refer
to
any
explosive
or
toxic
gas.
If
toxic
gas,
e.g.
carbon
monoxide
is
to
be
sensed
on
a
given
zone
move
the
switch
to
the
CO
position.
If
explosive,
e.g.
natural
gas,
LPG,
hydrogen
etc.
move
the
switch
to
the
GAS
position.
Example
shows
Zone
1
Explosive,
Zone
2
Toxic,
Zone
3
Explosive,
Zone
4
Explosive
Switch
1
on
2nd
DIP
switch
set
Positive
safety
determines
the
condition
of
the
main
alarm
relay
and
hence
the
operation
of
the
gas
valve.
When
it
is
'ON'
the
relay
is
in
a
normally
open
state.
When
it
is
'OFF'
the
relay
is
in
a
normally
closed
state.
NOTE:
This
affects
how
the
gas
valve
operates
and
means
that
you
may
need
to
change
how
it
is
wired
to
the
BX444
-
M
c
.
Example
shows
Positive
Safety
on
Switch
2
on
2nd DIP switch set
Main
Alarm
relay
actuation
method.
This
can
be
configured
to
provide
either
a
latching
or
a
temporary
alarm
operation.
When
the
main
alarm
is
actuated
in
an
alarm
condition
if
the
switch
is
in
the
'C'
position
the
relay
will
remain
in
this
position
even
after
the
concentration
of
gas
has
reduced
below
the
alarm
threshold.
If
the
switch
is
in
the
'I'
position
the
main
alarm
relay
will
actuate
for
60
seconds
and
then
if
the
level
of
gas
has
dropped
will
return
to
the
volt-free
main
alarm
relay
to
the
running
condition. The
indication
on
the
panel
fascia
and
the
audible
alarm
will
still
indicate
main
alarm.
This
mode
of
operation
is
used
when
using
manual
reset
gas
valves
and
battery
back-up
systems
for
extending
standby
battery
life.
Example
shows
detector
configured
for
a
latching
main
alarm
w:
www.duomo.co.uk
-
e:
-
t:
01905 797989
-
f:
01905 774296
|
©
Duomo
(UK)
Ltd.
20
16
Gas Sensed
Main Alarm relay
Reset Pressed
Time
Main alarm switch in 'C' position
Gas Sensed
Main Alarm relay
Reset Pressed
1 minute
Main alarm switch in 'I' position
