ADEMCO LST700 Series Insallation & Maintenance Manual page 15

From an installation point of view, detectors on zones assigned for coincidence should be installed
in close proximity to each other. This ensures if the user is not around to investigate the cause of
the alarm, that a detector in alarm on one zone is quickly confirmed by its neighbour on the
corresponding zone in the event of a real fire.
Alarms raised in zones not set up for coincidence will be processed as normal.
Non Latching Zones
Any or all of the zones on the fire alarm panel can be set up for non-latching operation.
Alarms raised from non-latching zones are indicated as normal but when the alarm stimulus that
triggered the zone is cleared, the alarm condition at the panel automatically clears too (i.e. a
manual panel reset is not required). Please note: alarms raised on non-latching zones will not
trigger the panel's auxiliary fire and remote outputs.
Delays
A delay of up to 10 minutes from the fire alarm panel being triggered to its alarm sounders and
outputs being activated can be programmed into the panel by the engineer. This is a particularly
useful feature for schools, nightclubs and other public places where the nuisance and panic
caused by a false alarm must be avoided.
The delay period can be set between 1 and 10 minutes by
adjusting the VR1 control on the Main Control PCB (pictured
right) with a terminal screwdriver. It should be noted that the
delay period will apply to all delayed zones.
When an alarm occurs on a delayed zone, it is processed as
normal. However, the activation of the sounders and outputs
is postponed until the delay period has expired, thus allowing
the cause of the alarm to be investigated by the user.
During the delay period, the output delays light on the front of the panel pulses to indicate the
delay is operative. Pressing the SILENCE / RESOUND SOUNDERS button will override the delay at any
time and result in the sounders and outputs being turned on. Pressing the panel's reset button
during a delay period (i.e. in the event of a false alarm) will return the system to normal.
Test
To aid commissioning and assist routine maintenance checks, a non-latching "one man walk test"
facility is available.
When a detector or manual call point is triggered on any zone(s) in test, the alarm sounders
operate for approximately one second on and eight seconds off. This cycle continues until the
cause of the alarm is removed (either by the test smoke clearing from the detector or the manual
call point being reset), at which point the detector circuit also automatically resets.
As the engineer walks around the site, additional devices on the zone(s) in test can be checked
with the momentary activation of the alarm sounders confirming correct operation.
Zones programmed for test, will be indicated at the panel by their fault lights pulsing quickly in
synchronisation with the general test light.
Should an alarm occur on a zone that is not programmed for test, the alarm will be processed in the
normal way. All zones that are in test will have their tests temporarily suspended until the alarm(s)
from the other zones are reset. At this point zone testing may resume.
will operate correctly despite being in test mode.
Fault diagnosis
A wide range of fault diagnosis features are available at access level three. These are described
in detail on pages 18 to 22 of this manual.
LST700 SERIES INSTALLATION & MAINTENANCE MANUAL • Approved Document No. DFU7002012 Rev 4
LST700 SERIES FIRE ALARM PANEL
Use a small terminal
5
screwdriver to adjust
4 6
the length of the
3
7
Delay period.
2
8
For information on
1
9
how to assign
0
10
individual Zones so
DELAY MINUTES
the Delay period
VR1
applies to them see
pages 16 and 17
In other words, the alarm
15