l
<F3> Key - Allows you to choose between Zone Coding and Zero Coding. In Zone Coding, a PNIS
code for the tested zone is played (e.g., Zone 12 is code l-2). In Zero Coding, two quick
pulses (code 0) are heard. In both cases, when a trouble is reported from a zone, the signal
circuits turn ON for 4 seconds.
l
eF4> Key - Enables/disables silent Walk Test”. When this key is pressed, it toggles the system to
audible Walk Test’“, where the signal circuits are turned ON to play the codes selected with
the <F3> key, described above. Silent Walk Test’” is used in conjunction with the logging
function when audible signals might disturb the building occupants.
During the Walk Test’“, the first line of the LCD shows changes, including the status of the device under test. The
second line of the LCD shows device status.
Walk Test’” OPERATION
When the 4020 system is placed in Walk Test’” mode, any zone in the active Walk Test’” group(s) can be tested in
any order. If zone coding is enabled, there is an advantage in testing all devices within one zone before going on to
the next zone.
You should simulate an alarm and trouble condition for each device being tested. If you are using an audible or visual
indication, wait for it to clear before you test the next device. Otherwise, wait for an appropriate amount of time
(based on the system reset delay) before moving on to the next zone. The LED on a smoke detector helps you in
this area, because it indicates when the alarm is sensed, and when the detector resets. If zone coding is enabled,
verify that the code heard or seen is correct.
Walk Test’” FEATURES
The Walk Test’” function has the following features:
l
Abort Audible and Delay On Reactivation
l
Active/Not Active
l
Auto Abort On Alarm
. Auto Abort On Time-out
l
Control Lists
l
Delay Before Reset
l
Log/No Log (Logging Option)
l
Monitor Zone List
l
Programmer Configuration
l
Sig/No Sig (Silent Walk Test” Selection)
l
System Trouble
l
Trouble Audible
l
Zone Code/Zero Code.
These features are discussed in the following paragraphs.
ABORT AUDIBLE AND DELAY ON REACTIVATION
Whenever a Walk Test” group is aborted, either manually or automatically, the control list sounds the abort code (O-
O-O) to indicate that the group is going back into service. If a control point in the list is already active, possibly
because another alarm has come in, the abort code will play before the alarm message. The group is put back into
normal operating service 60 seconds after the abort signal is heard (if there are signals in the control list). This delay
protects against an unwanted alarm should an auto abort occur while a device is being tested.
53
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