
Installation
and
Operation
Manual
43
General
Trouble
Sensing
Error
Contamination
Please
refer
to
the
Trouble
Conditions
section
for
more
detail
on
each
event
type.
Manual
StationResponse
Addressable
manual
stations
may
be
intermixed
on
the
circuit
with
proper
response
programmed
into
the
control
panel.
Drift
Compensation
The
Drift
Compensation
is
built
into
a
compatible
detector
and
is
not
performed
by
the
panel.Drift
compensation
automatically
adjusts
for
gradually
increasing
effects
of
dust
and
otheraccumulations
of
dirt
in
the
detectors.
It
will
adjust
the
thresholds
to
compensate
for
a
detectorgoing
dirty
according
to
the
gradual
change
in
the
normal
clean
air
value
received.
When
it
canno
longer
compensate
for
an
increasingly
dirty
detector,
a
dirty
detector
trouble
(Contamination
trouble)
is
indicated
forthat
device.
Alarm
Verification
The
Alarm
Verification
function
is
supported
by
this
panel.
One
typical
alarm
verification
phase
can
be
divided
into
2
periods.
The
first
period
is
a
retard
period
in
which
no
alarm
reports
on
the
Fire
Alarm
Control
Panel
(FACP).
The
second
period
is
a
confirmation
period
in
which
alarm
reports
on
the
Fire
Alarm
Control
Panel
if
a
device
is
in
alarm
status.
The
detail
alarm
verification
phase
is
illustrated
in
Figure
32.
Figure
32
Alarm
Verification
A
‐
Smoke
detector
goes
into
alarm.
(LED
on
device
turns
to
steady
on)
AB
‐
Retard
Period:
Fire
Alarm
Control
Panel
senses
detector
in
alarm
and
delays
alarm
signal
for
50s.
During
this
period,
no
alarm
event
reports
on
the
Fire
Alarm
Control
Panel.
BC
‐
Confirmation
Period:
Detector
is
operational
for
alarm
at
point
B.
If
the
detector
is
still
in
alarm
at
point
B,
the
Fire
Alarm
Control
Panel
will
report
an
alarm.
If
the
detector
is
not
in
alarm,
the
system
returns
to
standby.
If
the
detector
re
‐
alarms
at
any
time
during
the
confirmation
period
the
Fire
Alarm
Control
Panel
will
alarm.
The
period
length
is
60s.
CD
–
Restart
next
alarm
verification
period
if
new
alarm
occurs.