User manual

12 LST700 SERIES USER MANUAL • Approved Document No. DFU7001003 Rev 4
LST700 SERIES FIRE ALARM PANEL
What is a delay?
A delay can be programmed into the fire alarm panel to postpone the activation of the alarm
sounders and other outputs for a predetermined length of time. The delay period gives a responsi-
ble person time to investigate the cause of an alarm, usually in areas which are prone to false
alarm (such as waiting rooms filled with smoke) before the building is evacuated. If the cause of
the alarm is found to be a true fire hazard, the delay can be overridden and the alarm sounders
activated immediately. Alternatively, in the case of a false alarm, the panel can be reset.
Delay options
One, some or all of the zones on the fire alarm panel can have a delay applied to them to suit the
requirements of the site. The same delay period applies to all delayed zones and is adjustable to
a maximum of 10 minutes. The programming of delays must only be carried out by competent
service personnel who are advised to record all relevant delay data on the System Set-up Data
Chart on page 13 of this user manual.
Delays should only be used with the prior knowledge and
consent of all relevant authorities i.e fire officer, building control, etc.
Delay indication
If delays have been programmed into the panel the Output Delays light and the general disable-
ment light will be lit steadily. This means the immediate turning on of the alarm sounders and other
outputs on one or more zones has been disabled. The only way to ascertain which
zones have been programmed with a delay is to refer to the System Set-Up Data Chart on page 13.
What happens when there is a fire alarm condition on a delayed zone?
Should an alarm occur on a delayed zone, the panel will:-
■ Flash its general fire and appropriate fire zone light(s)
■ Sound its internal sounder
■ Start the delay countdown sequence
■ Indicate a delay is running by flashing its Output Delays light
How to override a delay in the event of a true fire alarm condition
■ If, on investigation, the cause of the alarm on the delayed zone is found to be a true fire
hazard, pressing the Silence / Activate Sounders button at any time will override the
delay and activate the alarm sounders and outputs with immediate effect.
How to reset the system in the event of a false alarm
■ If, on investigation, the cause of the alarm is found to be false, put the panel into access level
two (see page 6) and press the Control Panel reset button .
How to turn the delays function on or off
Any delays that have been programmed into the panel can be turned on or off by putting the panel
into access level two and following the disablement / enablement selection process as described
on pages 10 and 11.
Selecting the Output Delays option and then pressing the Enable/Disable button so that the Output
Delays
light flashes in synchronisation with the general disablement light shows that the delays are on.
Pressing the Enable/Disable button again will make the Output Delays light flash slower than the
general disablement light, showing that the delays are off.
Having chosen the desired setting, pressing the Next Option button will exit the disablement /
enablement selection process . The Output Delays light will now be lit steadily with the general
disablement light, showing that delays are on, or the Output Delays light will be off, showing that
delays are off.
NOTES ON DELAYS