2.10 SYSTEM ALARM indication. Check
The procedure for checking that the SYSTEM ALARM circuits are operating
correctly is as follows, and should be carried out on all alarm panels:-
2.10.1 Electrical power supply. Switch OFF
2.10.2 Indications. Check.
Check that POWER ON LED is extinguished and SYSTEM ALARM LED is
illuminated (flashing), accompanied by an audible warning, after 15
seconds. If the panel receives an input, ensure that the gas display on
all panels displaying that particular gas service have illuminated
(flashing) LED’s for all input alarm stages and the SYSTEM ALARM LED
illuminates with an audible warning.
2.10.3 Electrical power supply. Switch ON.
Ensure that all indications return to NORMAL, including displays on
repeater panels.
2.10.4 Alarm panel front cover. Open
2.10.5 Line contact monitoring. Check open circuit.
Disconnect input plug from gas service channel on power supply pcb.
Check that the respective gas service channel indicates NORMAL and
that all ‘alarm conditions’ are steady illuminations. Check that SYSTEM
ALARM LED illuminates (flashing) accompanied by an audible warning.
Press the TEST switch and ensure that all alarm LED’s flash at a slower
rate than other displays. Check that all repeater panels which display
that input indicate all ‘alarm conditions’ and SYSTEM ALARM in a
flashing mode.
2.10.6 Input. Reconnect.
Reconnect the input plug to gas channel ensure that all indications
are NORMAL. Repeat with all other inputs.
2.10.7 Line contact monitoring. Check short circuit.
Using a small piece of wire as a shorting link, short out input terminals
(C and either terminal 1, 2, 3 or 4 as applicable). Check that the
respective gas service display indicates NORMAL and that the
respective ‘alarm condition’ illuminates (steady). Check that the
SYSTEM ALARM LED illuminates (flashing) accompanied by an audible
warning. Press the TEST switch and ensure that the respective ‘alarm
condition’ flashes at a faster rate than other displays.
2.10.8 Shorting link. Remove.
Remove shorting link and repeat Step 2.10.7 with all other inputs. On
completion, ensure that all indications are NORMAL.
2.10.9 Alarm panel front cover. Close and secure.
2.11 Central alarm panel(s). Check MUTE operation.
With an alarm condition illuminated in flashing mode, operate MUTE switch
on central panel. Check all repeater panels displaying that alarm condition
revert to a steady alarm indication.
2.12 Alarm system. Set.
Ensure that all alarm panels are closed and secured. Ensure that each gas
service installation is operating normally and only NORMAL indications are
displayed.
2. COMMISSIONING
continued
