Specifications

151051 6-1
Section 6
S
y
stem Operation
The annunciator on the SK-2224 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 6-1 On-Board Annunciator
6.1 Meaning of LEDs
The chart below explains the meaning of LEDs on the system board.
Table 6-1: 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 acknowledged
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
faulted or 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 1 minute and 30 seconds.