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Section 20: Fire System Operation
20.1 Manual Signal Silence
Once the panel is in alarm and the alarm notification appliances
are active, entering a valid user code will silence the alarm sig
-
nals. If an LCD4521 keypad is used, pressing the “Silence Bells”
function key then entering a valid user code will silence the sig
-
nals. (see below for Valid User Code)
If the signal silence inhibit timer (Fire Silence Delay) is pro-
grammed, the user will be unable to silence the alarm notification
appliances until the timer has expired. In this case, the LCD dis
-
play will show “SILENCE INHIBIT XX MIN” to indicate how
much time remains before silencing can be done. This display will
show for three seconds and the LCD display will then return to
the Auto-Scroll mode. Silencing will not deactivate any output
programmed as Fire Strobe.
Once the signals are silenced, the LCD Auto-Scroll mode stops
and the message “FIRE BELL HAS BEEN SILENCED” is dis
-
played. This message will remain until any key is pressed. The
“FIRE BELL HAS BEEN SILENCED” message will return 30
seconds after the last keypress.
Manual Silencing initiates a trouble condition by turning on the
keypad trouble LED and sounding the keypad buzzer. The buzzer
may be silenced by entering an access code.
If a Waterflow Alarm is present on the system silencing will not
be possible. Instead, the system will announce, “Silence Inhibit.
Waterflow Alarm.” All Waterflow Zones must be secured before
the system can be silenced.
20.2 Automatic Signal Silence (Bell Cut-Off)
Ref #: [000200] Fire Timeout (default Y)
Ref #: [00020300] Bell Cut-Off (default 004 minutes)
The fire alarm notification appliances may be set to silence auto-
matically after a programmed time. The system is default pro-
grammed to silence the notification appliances four minutes after
the last initiated fire alarm. If the Fire Timeout option is disabled,
the notification appliance can only be silenced manually.
The Bell Cut-off timer begins upon the first fire alarm. Each sub-
sequent alarm will restart the timer.
If the alarm notification appliances are silenced automatically, the
Auto-Scroll feature will continue and will include the following
message: “FIRE BELLS HAVE BEEN SILENCED.” Outputs
programmed as Fire Strobe will not deactivate on Bell Cut-off.
NOTE: If the Fire Silence delay is programmed, the Bell Cut-off time
must be set for a time equal to or greater than the Fire Silence delay
time. This will ensure that the alarm notification appliances cannot be
silenced manually or will not silence automatically before the Fire
Silence Delay time has expired.
Automatic silencing initiates a trouble condition by turning on the
keypad trouble LED and sounding the keypad buzzer. The buzzer
may be silenced by entering an access code.
20.3 Signal Silence Inhibit Timer (Fire Silence Delay)
Ref #: [000203111] Fire Silence (default 000 minutes)
When it is required that the Alarm notification appliances operate
for a minimum period before they can be silenced, program the
Fire Silence Delay timer for that period. Manual silencing will be
inhibited for the programmed period and if a user attempts to
silence before the delay expires, the LCD will display “SILENCE
INHIBIT XX MIN” to indicate how much time remains before
manual silencing can be done.
The Bell Cut-off timer must be disabled (Fire Timeout = N) or set
to a time equal to or greater than the Fire Silence Delay time. This
is to guarantee that the alarm notification appliances will not
silence automatically before the Fire Silence Delay period.
20.4 Fire System Reset
Once the Fire notification appliances have been silenced (manu-
ally or automatically), the fire system may be reset by entering a
valid user code. On an LCD4521 keypad, pressing the Fire reset
function key then entering a valid user code will reset the system.
The “Fire Silence Delay” timer will inhibit both manual silencing
and reset until the delay period expires.
When the system is reset, all latched fire functions within the
panel are restored and a Sensor Reset is initiated to restore all 2-
and 4-wire smoke detectors. If an alarm is present at the end of the
reset period, the panel will go into alarm. The Auto-Verify Fire
delay and Waterflow delay are both in force after a system reset.
Fire Supervisory Off-Normal is a latched function and will be
restored on system reset.
20.5 Manual Sensor Reset ([*][7][2])
Ref #: [0100XX01] Com O/P2 Rq Cd (default N)
where XX = Partition (01 to 08)
The Sensor Reset function is designed so that the user can manu-
ally reset latching smoke detectors by entering [*][7][2]. In order
for this feature to function, the detectors to be reset must be con
-
nected to a programmable output (SAUX+, PC4204/
PC4204CXCF).
Program the output as “Command Output 2” (output option #39).
The output pulse time is default set at five seconds. For instruc
-
tions on output programming, see your PC4020 Installation Man-
ual, Section 11 “Programmable Outputs.”
RECOMMENDED: As a security measure, enable the Com O/P2
Rq Cd partition toggle option. This will require that a user enter a
valid access code after entering [*][7][2] in order to reset smoke
detectors.
20.6 Subsequent Alarm Operation
If the alarm notification appliances have been silenced – manually
or automatically – and a subsequent fire alarm is initiated, the fol
-
lowing will occur:
• Audible and Visual notification appliances will activate as
programmed.
• Auto-verification is overridden for Auto Verify Fire zones
(alarms are instant).
• The Waterflow Delay is maintained for waterflow zones.
• The Bell Cut-off timer, if used, will restart for a full timing
period before automatic silencing.
• The Fire Silence Delay timer, if used, will NOT restart. The
silence inhibit period is not reinstated and silencing can be
done without any delay.
• Auto-Scroll is initiated. The new alarm and all previous
alarms/troubles will be displayed.
If a subsequent Fire alarm is initiated before the alarm notification
appliances have been silenced, either manually or automatically,
then the following will occur:
• Auto-Verification is overridden for zones programmed as
Auto-verify types. (alarms are instant)
• The Waterflow Delay is maintained for waterflow zones.
• The Bell Cut-off timer, if used, will restart for a full timing
period before automatic silencing.
• The Fire Silence Delay timer will restart for a full timing
period. Silence Inhibit is extended to ensure a full period after
the last alarm.
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