Specifications

Page 2 © 2004 Bosch Security Systems DS7420i Installation Instructions
4.0 Operation
4.1 Normal Condition
Under normal conditions, the keypad Power and Status Lights will
be on steady.
4.2 Fire Alarm
During a fire alarm, the alarm sounding devices and the keypad
sounders will be activated. The keypad display will read “Fire
Alarm.”
• To silence the fire alarm sounders:
Enter a valid PIN followed by the [Off] key. "Fire Alarm" and
“Sounder Silenced” will then be displayed.
• To reset the system:
Determine the cause of the alarm. Then enter a valid PIN
followed by [System Reset]. This command clears the "Fire
Alarm" and “Sounder Silenced” displays.
NOTE: The control must be reset after a fire alarm or future
alarms will not be detected.
4.3 Fire Trouble
During a fire trouble (e.g. open on a Class A loop, open on any fire
loop), the keypad sounders will pulse once every 10 seconds. The
keypad display will read “Fire Trouble” with a zone number. A fire
trouble with no zone number indicates a ground fault.
• To silence the sounders:
Enter a valid PIN followed by the [Off] key.
If the cause for the Trouble condition has been eliminated, the
sounders will silence and the “Fire Trouble” display will be
cleared.
If the cause for the Trouble condition has not been eliminated,
the sounders will silence, but the "Fire Trouble" display will not
be cleared. The keypad will also display the zone that is in the
Trouble condition.
• To clear the display:
Eliminate the cause of the Trouble condition. Then enter a valid
PIN followed by the [Off] key.
4.4 Supervisory Signal
During a Supervisory Signal (e.g. wiring to supervisory zone has
been shorted), the keypad sounders will pulse once every 10
seconds. The keypad display will read “Supervisory” with a zone
number.
• To silence the sounders:
Enter a valid PIN followed by the [Off] key.
If the cause for the Supervisory condition has been eliminated,
the sounders will silence and the “Supervisory” display will be
cleared.
• To clear the display:
Eliminate the cause of the Supervisory condition. Then enter a
valid PIN followed by the [Off] key.
4.5 Control Trouble
During a Control Trouble, the Power Light will be flashing and the
keypad sounders will pulse every ten seconds. The keypad display
will read “Control Trouble/Press #87.”
A Control Trouble can be caused by several conditions.
• To silence a Control Trouble:
Enter a valid PIN followed by the [Off] key.
• To determine the cause of the Control Trouble:
Enter a valid PIN followed by [#] [8] [7]. One of the following will
be displayed:
- AC Failure: AC power has been lost or has gone below the
“Brown Out” level. The Power Light will continue to flash until
AC power has been restored. If AC power restores while the
Trouble condition has been silenced, the sounders will begin
to pulse again.
- Low Battery: The battery voltage has dropped below 12 VDC
or the battery is missing. The Low Battery condition may be
cleared, but will return if the battery fails the next battery test.
After clearing a Low Battery condition, the battery should
immediately be tested as described in the “Testing Procedure”
section below. If the battery restores while the Trouble condition
has been silenced, the sounders will begin to pulse again.
- Bell Trouble: The bell circuit wiring is open or shorted. The
keypad sounders will pulse once every 10 seconds (if in
Commercial Fire Mode). The keypad display will read “2Ph/Bell
Fault.”
To silence the sounders, enter a valid PIN followed by the [Off]
key. If the cause for the Trouble condition has been eliminated,
the sounders will silence and the “2Ph/Bell Fault” display will
be cleared.
If the cause for the Trouble condition has not been eliminated,
the sounders will silence, but the “2Ph/Bell Fault” display will
not be cleared.
• To clear a Control Trouble:
Eliminate the cause of the Trouble condition. Then enter a valid
PIN followed by [System Reset].
4.6 Testing Procedure:
The sounders should be tested (at least weekly) using the keypad
activated Sounder Test.
If the cause for the Supervisory condition has not been elimi-
nated, the sounders will silence, but the “Supervisory” display
will not be cleared.