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7-1
Section 7
System Operation
The annunciator on the SK-4224 board is used for all system operation. It contains the
switches for enabling silencing, resetting, and so on. The LEDs that indicate system status are
also located on the annunciator.
Figure 7-1 On-Board Annunciator
7.1
Meaning of LEDs
The chart below explains the meaning of LEDs on the system board.
Table 7-1: Meaning of LEDs
LED (Color)
Function
Comments
AC (green)
ON = Good AC
OFF = Low AC trouble condition and it was acknowledged
FLASHING = Unacknowledged AC Low trouble condition
If flashing, press the ACK button to
acknowledge the condition.
GENERAL TROUBLE
(yellow)
ON = System trouble
OFF = System OK
FLASHING = At least one serial device is in trouble
DOUBLE FLASHING = Two types of serial devices are in trouble.
WALK TEST (yellow)
ON = Walk test is in progress
OFF = Walk test is off.
FLASHING = Walk test is on and at least one zone is not ready
Allow approximately 47 seconds between
detector tests.
In walk, test when a detector is tripped, it
will cause an alarm for two seconds, then
the control panel will drop power to the
loop for seven seconds to reset the
detector. Then an additional 38 seconds is
needed to restore the detector.
If verification is used, the time between
detector test will be about 2 minute and
30 seconds.
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