52
• Smoke Detectors on the Addressable Loop
• WLS906 Wireless Smoke Detectors
Delayed Fire Operation
On alarm, the alarm notification outputs will activate immedi-
ately. The transmission and event buffer log are delayed by 30
seconds to allow the user to investigate the cause. If the user
acknowledges the alarm by pressing any key, the alarm notifica
-
tion appliances will silence, the transmission will be aborted and
the event will not be logged to the event buffer.
If the smoke detector is not restored to normal within 90 seconds
of the alarm being acknowledged, the alarm notification output
will reactivate. The user will again have 30 seconds before the
output latches and the communicator activated. A valid access
code will then be required to silence the alarm notification appli
-
ances.
18.4 Auto Verify Fire
Auto verification is designed to reduce false alarms that may be
generated by smoke detectors. Fire alarm initiating zones pro
-
grammed as Auto Verify Fire must ONLY have smoke detectors
connected to them. The Auto-Verify feature delays the alarm
response by up to 90 seconds.
All 128 zones can be programmed as Auto Verify Fire zones. For
zones on the main panel or zone expanders, this zone is always an
end-of-line resistor type with Normally Open alarm contacts from
the alarm initiating device(s). Multiple devices may be connected
on a single zone.
If the 2-wire smoke auto-verify feature is enabled in the System
Toggles section (ref. # [000200]), the panel will automatically
verify alarms from the 2-wire smoke circuit of the PC4701 before
sounding the bells and transmitting the alarms. See the PC4701
Installation Instructions for more information.
The zone wiring is supervised by the control panel for:
• Short Circuit: Fire Alarm
• Open Circuit: loss of the end-of-line resistor and will be indi-
cated as a Zone Trouble
• Ground Fault: resistance < 40k to earth ground indicated as
a Common Ground Fault Trouble.
NOTE: This zone type is only for smoke detectors that can be reset by
the control panel. Do not mix contact type alarm initiating devices on
zones programmed for Auto Verify Fire. The following devices can be
used:
• 2-wire smoke detectors on the PC4701 2-Wire Smoke zone
• 4-wire smoke detectors powered from the SAUX+ output on the
PC4020 main board
• 4-wire smoke detectors powered from the AUX output through a
relay contact programmed for Sensor Reset on the PC4204/
PC4204CXCF module
• AMS-220 smoke detectors on the addressable loop
Auto Verification Operation
On an alarm from a smoke detection zone with the Auto-verify
feature selected, the panel will automatically perform a sensor
reset for 20 seconds. Upon release of the sensor reset, 10 seconds
are allowed for the smoke detectors to settle. During this 30-sec
-
ond period, no alarms will be received from any system Auto Ver-
ify Fire zone.
For 60 seconds after the 10 second settling time, if any smoke
detector in the system goes into alarm, the panel will immediately
initiate the full fire alarm sequence. If the 60-second window
expires without any smoke detector alarms, any subsequent
smoke detector alarms from Auto Verify Fire zones will reinitiate
the Auto-Verify cycle.
If at any time during the Auto-verify cycle an Alarm is received
from any other Fire zone, the auto verification cycle will be termi
-
nated and the panel will immediately go into the full fire alarm
sequence. Once the panel is in alarm, the Auto verification
sequence will be ignored and any alarm from an Auto-Verify zone
will be transmitted immediately. The auto verification sequence is
only restored once a Fire Reset has been performed.
18.5 Waterflow Zone
All 128 zones can be programmed as Waterflow Fire zones. The
PC4701 has one dedicated Waterflow zone. This type is a Contact
Input Fire Zone and is always an end-of-line resistor type with
Normally Open Alarm Contacts from the initiating device(s). A
maximum of five waterflow contacts can be connected in parallel
on a single Waterflow zone.
The zone wiring is supervised by the control panel for:
• Short Circuit: Fire Alarm
• Open Circuit: loss of the end-of-line resistor and will be indi-
cated as a Zone Trouble
• Ground Fault: resistance < 40k to earth ground indicated as
a Common Ground Fault Trouble.
Typical alarm initiating devices used on this zone type are water-
flow switches for Fire Suppression sprinklers
NOTE: For this type of zone, only waterflow alarm initiating devices
can be connected. A maximum of five (5) waterflow alarm initiating
devices is allowed per zone (Ref: NFPA 72 / 5-6 and 3.8.5).
Waterflow Delay
Ref #: [00020309]
This delay is to prevent false alarms due to surges in the sprinkler
system. The Waterflow delay is automatically applied to the
Waterflow zone on the PC4701. For other waterflow zones, you
must also enable the Waterflow Delay zone attribute.
If the Waterflow Delay is required, use the PC4701 Waterflow
zones first. If delays are not required then the Waterflow delay
must be set to [000].
The Maximum delay allowed is 90 seconds. The default is 000
seconds (disabled).
Waterflow Delay restrictions:
• The Waterflow Delay must be 90 seconds or less
• Do not program the Waterflow Delay when Waterflow
switches with built-in mechanical delays are used
• In all cases, the total delay (from switches and programming)
must not exceed 90 seconds
• Do not use the Waterflow Delay for systems that employ ON/
OFF type sprinkler heads
The first waterflow zone to go into alarm will start the delay
timer. This timer will not restart when any subsequent Waterflow
zones go into alarm. Once the timer has expired and the initiating
Waterflow zone or any other Waterflow zones have not been
restored, a Waterflow Fire Alarm will be initiated.
If the Waterflow delay has been initiated, any other non-water-
flow fire zones that go into alarm before the timer expires will ini-
tiate an immediate Fire Alarm. In this case, all Auto-Verify delays
will be overridden.
18.6 Fire Supervisory Zone
All 128 zones can be programmed for Fire Supervisory. This zone
is always an end-of-line resistor type with normally open alarm
contacts from the Fire Supervisory initiating devices. A maximum
of 20 Fire Supervisory devices can be connected in parallel on a
single zone.
The zone wiring is supervised by the control panel for:
• Short Circuit: Supervisory Off-Normal
• Open Circuit: loss of the end-of-line resistor and will be indi-
cated as a Zone Trouble
• Ground Fault: resistance < 40k to earth ground indicated as
a Common Ground Fault Trouble.
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