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• When Individual Acknowledge is used and a fault condition has been acknowledged
with the <ACK> key, and further unacknowledged fault conditions remain in the system,
the tone-alert continues to sound and the next status change is shown on the
alphanumeric display.
NOTE: Normally, points may not require acknowledgment and do not latch. If the system
does not clear, read the display, then check for devices still in fault (manual call
points, smoke detectors etc.).
3.4.2 System Reset to Clear Faults
Some faults latch until they are reset manually or can be cleared by pressing the <SYSTEM
RESET> key once the fault condition has been rectified. This applies to Open Circuit faults
on MAPNET and RUI communications lines.
If a monitor point or device intermittently toggles faults or will not reset, the user may elect to
ISOLATE the faulty zone or isolate the faulty device.
procedures).
3.5
FAULT INDICATIONS FOR TrueAlarm™ SENSORS
The devices that are used for TrueAlarm™ operation are considered sensors instead of
detectors, because these devices do not determine alarm conditions. The TrueAlarm™
smoke sensor is a measuring device that sends data regarding smoke density to the 4100
control panel. The TrueAlarm™ heat sensor operates in a similar fashion, but sends
temperature data instead of smoke density data. The 4100 uses this data to determine
whether a fault has occurred. This basic operational difference is the key to TrueAlarm™
operation.
The TrueAlarm™ sensor has two automatic fault conditions:
Dirty, and
Excessively Dirty
3.5.1 Dirty Fault Indication
A sensor specific "dirty" fault condition is reported any time the average value on an
individual sensor reaches a set threshold. At this point in time, the 4120 FIP is still
compensating for environmental factors and holding the set sensitivity level. The sensor
should be scheduled for cleaning.
LEVEL 2 - ROOM 74
SMOKE DETECTOR
Document No.: 4100-M004
SIMPLEX 4120 NETWORK FIRE INDICATOR PANEL
June 1997
OPERATOR MANUAL
(Refer Section 2.4 for isolate
DIRTY
Issue 1.0
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