57
• 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 noti-
fication 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 tim-
ing 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.
• The new alarm is added to the Auto-Scroll list.
20.7 Fire Silence/Reset User Codes
The Silence Fire
Silence FireSilence Fire
Silence Fire access code toggle option is designed to
limit the number of users who can Silence/Reset the Fire
system. When programming access codes in the [*][5] user
programming section, program this option as ‘Y’ for those
users who will have the authority to Silence/Reset the Fire
system. Select ‘N’ for all others. For more information
regarding programming access codes, please see the
PC4020 Instruction Manual.
20.8 Auto-Scroll LCD Keypad Display
When a Fire Alarm is initiated, the Alarm and selected trou-
ble conditions will be displayed on the system LCD key-
pad(s). If there is more than one alarm or trouble present
simultaneously, the keypad will continuously scroll
through each event. Items on the scroll list are displayed at
two-second intervals. The keypad will beep as each mes-
sage is displayed.
Although critical troubles are displayed, Auto-Scroll is only
initiated upon a Fire Alarm. If a Fire Trouble is detected and
a Fire Alarm is not present, the trouble will be indicated as
any other system trouble; the keypad trouble light will turn
on and the keypad buzzer will beep.
The following events are included in the Auto-Scroll.
• “First Fire Alarm [Zone Label]”
First Fire Alarm [Zone Label]”First Fire Alarm [Zone Label]”
First Fire Alarm [Zone Label]”: This message will indi-
cate which Fire Alarm was first detected by the control
panel. Each time this message is displayed the keypad
buzzer will beep twice to distinguish it as the first fire
alarm.
• “Fire Alarm [Zone Label]”
Fire Alarm [Zone Label]”Fire Alarm [Zone Label]”
Fire Alarm [Zone Label]”: This message will appear for
all subsequent Fire Alarms and the keypad buzzer will
beep once as the message is displayed. Messages are
displayed sequentially by zone number.
• “Supervisory [Zone Label]”
Supervisory [Zone Label]”Supervisory [Zone Label]”
Supervisory [Zone Label]”: This message will appear
for Fire Supervisory Off-Normal conditions only and
the keypad buzzer will beep once as it is displayed.
Messages are displayed sequentially by zone number.
• “Fire Bell Has Been Silenced”:
Fire Bell Has Been Silenced”:Fire Bell Has Been Silenced”:
Fire Bell Has Been Silenced”: This message will appear
in the Auto-Scroll list after the alarm notification appli-
ances have been automatically silenced.
• “Bell Zone Trouble”:
Bell Zone Trouble”:Bell Zone Trouble”:
Bell Zone Trouble”: This message will appear if a short
or open fault is detected on the PC4020 bell zone or any
PC4702 output.
• “Failure to Communicate”:
Failure to Communicate”:Failure to Communicate”:
Failure to Communicate”: This message will appear
when the panel cannot report to the Central Station.
Auto-Scroll will stop when a valid user code is entered to
silence the alarm notification appliances.
20.9 Fire Trouble Conditions
In all cases, when the panel detects a trouble condition, the
keypad Trouble light turns on and the keypad buzzer will
sound two short beeps every 10 seconds. Entering and
access code will silence the audible trouble signal. The trou-
ble buzzer will resound if another trouble is generated or
the trouble is not cleared within 24 hours.
If a PC4701 is connected to the system, and the Common
Fire Trouble output is connected, the output will activate
when any of the following events occur. The output will
deactivate when all trouble conditions are restored.
Fire Supervisory Alarm
An Off-Normal condition on a Fire Supervisory zone will
cause the PC4701 Common Fire Trouble output to activate.
See “Fire Supervisory Zone” on page 53.
Fire Zone Trouble
A fire zone trouble will be generated when an open circuit
is detected on any Fire zone.
Fire zone troubles are grouped for remote annunciation as
“Fire Zone Trouble.” This indication can be programmed on
the PC4612 Fire Zone Annunciator or on the PC4632/4664
Point/Graphic annunciators (output option #48).
Bell Trouble
A Bell trouble is generated when an open or short is
detected on any PC4702BP alarm notification output. A bell
trouble is also generated when an open condition is
detected on the PC4020 bell output.
Bell troubles are grouped for common indication on a
remote annunciator as a “Bell Zone Trouble.” This indica-
tion can be programmed on the PC4612 Fire Zone Annunci-
ator or on the PC4632/4664 Point/Graphic annunciators
(output option #56).
AC Trouble
An AC Fail trouble is generated if the AC fails on the
PC4020CF main panel or on the PC4204/PC4204CX,
PC4702 or PC4820 modules. AC troubles are grouped for
common indication on a remote annunciator as an “AC
Trouble.” This indication can be programmed on the
PC4612 Fire Zone Annunciator or on the PC4632/4664
Point/Graphic annunciators (output option #56). This trou-
ble should use a green indicator which is normally ON and
turns OFF for any AC failure.
See also Section 4.10 “AC Delays.”
Battery Trouble
A Battery trouble is generated if any of the following panel
batteries are open or shorted: PC4020, PC4204/PC4204CX,
PC4702 and PC4820. This trouble condition only turns on
the keypad Trouble light and sounds the keypad buzzer.
Ground Fault
Ground fault detection must be enabled for Commercial
Fire installations by connecting the EGND terminal on the
PC4020CF to a solid earth ground. Upon detection of a
resistance of <40k
Ω
between any extended conductor and
earth ground, a Ground Fault Trouble will be generated.
Ground fault can be indicated on a PC4632/4664 Point/
Graphic Annunciator (output option #54). All PGM outputs
programmed as Ground Fault will turn ON.
TLM Troubles
If the PC4701 detects a TLM trouble on telephone line 1 or
2, the PC4701 Common Fire Trouble output will activate.
The panel can only monitor telephone lines if a PC4701 is
connected.
NOTE: TLM trouble monitoring cannot be disabled.
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