D4220 Installation Manual - D4220-INST/09F/v2
14
4.2 Classes of Events and Alarms Explained
There are three classes of events, summarised as:
Alarms / Telemetry
Tampers
Faults
1. Door contact magnet removed
from the reed (e.g. door
opening)
1. Door contact removed
from its mounting surface
or cover removed
1. Radio device low
battery
2. Door contact alarm loop opened
2. PIR opened
2. Radio jamming
2
3. PIR detector sensing movement
3. 4-channel transmitter
removed from its
mounting surface or lid
removed
3. Supervision
1
fault
4. Any button pressed on the
remote hand-held controller
4. Supervision
1
tamper
5. Any alarm loop opened on the 4
channel transmitter
5. D4220 receiver unit
removed from its
mounting surface or lid
removed
6. Fire alarm from smoke detector
6. D4221 expander unit
removed from its
mounting surface or lid
removed
7. Water alarm from water detector
NOTES
:
1. Supervision is where radio detectors send a periodic signal to check the radio system
integrity. If no signals are received within 20 minutes, a radio fault is registered. If no
signals are received for 2 hours, a radio tamper is registered.
2. Radio jamming or interference is registered if a radio signal is received continuously for 30
seconds or more without any sensible information being received.
4.3 First to Alarm Display (FTA)
The First to Alarm display (FTA) is used to indicate the first area or device to detect an alarm. Other
alarms will not overwrite the display memory and it will be displayed until locally reset. Multiple faults
can be displayed, but will always be overwritten by a FTA. If faults and alarms are detected, the FTA
will be shown and when reset (multiple) faults will then be displayed.
4.4 Reset Button
Pressing the reset button on the front panel resets the unit. If there are alarms and faults, the first
display shown steadily will be the FTA. Pressing the reset button will clear the FTA. Pressing the
reset button will clear the FTA display, allowing the display of any faults. If there are multiple fault
events, the display will scroll through them, with a slight pause between each event allowing the user
to note them. When all the alarm and fault displays are cleared, a final key press will clear the reset
pending LED. The remote reset input can only reset the relays and FTA displays: it cannot reset fault
displays and the reset LED.
4.5
Reset LED
This LED indicates when a user reset is required to either clear the display or reset the output relays.
The reset LED can only be reset from the front panel and not remotely. This is to indicate locally that
there has been a past alarm registered although the unit has been remotely reset without the display
being seen.
Pressing the reset button again when a subsequent key press has cleared the display, will extinguish
the reset LED.
