ESSENTIAL ALARM CONDITION KEYS
The essential keys for alarm conditions are the <ALARM ACK> (Alarm Acknowledge), <ALARM SILENCE>, and the
<SYSTEM RESET> keys. The remaining keys are concealed by the interface panel access door and are associated
with advanced system functions. (See Section 8, Advanced Functions.)
ALARM ACKNOWLEDGE KEYS
The <ALARM ACK> keys are located directly under the FIRE ALARM LED and the PRIORITY 2 ALARM LED.
Pressing the <ALARM ACK> key (twice for Individual Acknowledge or once for Global Acknowledge) causes the
ALARM LED to change from flashing to steady ON and silences the tone-alert. Pressing the <ALARM ACK> key
does the following:
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Selects the next unacknowledged alarm point in the list for display (Individual Acknowledge)
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Acknowledges the displayed point or acknowledges all points on the list (Global Acknowledge)
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Scrolls the points chronologically after all points have been acknowledged.
If the <ALARM ACK> key is passcode protected, you cannot use this key to acknowledge alarms unless you have
the required access level. (See Operator Access Levels, Section 8, and Log In Procedure, Section 1.)
There are two types of acknowledges for the 4020 system: Global Acknowledge and Individual Acknowledge. Each
acknowledge type operates with the System Alarm Condition in the following manner.
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Global Acknowledge - When Global Acknowledge is used on the 4020 system, a single key press of the
<ALARM ACK> key acknowledges all alarm status changes in the system. If status change information is
required, you may review this data by pressing the <ALARM ACK> key and reading the alphanumeric display.
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Individual Acknowledge (For NFPA 72 Proprietary Receiver Requirements) - If an alarm condition has
been acknowledged with the <ALARM ACK> key and further unacknowledged conditions remain in the
system, the tone-alert continues sounding and the next status change shows on the alphanumeric display.
This process repeats until all changes are acknowledged. When this occurs, the tone-alert silences, and the
highest priority acknowledge change appears on the display.
ALARM SILENCE KEY
CAUTION
PRESSING THE ALARM SILENCE KEY CAUSES FIRE ALARM EVACUATION SIGNALS TO TURN
OFF: FOLLOW LOCAL PROCEDURES TO SILENCE ALARM EVACUATION SIGNALS.
When an alarm condition exists, various signals, auxiliary relays, the city connection, and the tone-alert may activate
(depending on the type of alarm condition, the system configuration, and the stage of the alarm condition). The
<ALARM SILENCE> key, when pressed, turns OFF all circuits programmed to follow the Alarm Silence key. The
<ALARM SILENCE> key press will:
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Turn OFF signal circuits
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Turn ON the ALARM SILENCED LED
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Display a message, such as the one shown below.
ALARM SILENCE IN PROGRESS...
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