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6
en | Operation
3
Operation
3.1
Waterflow Alarm
When using waterflow switches without retard on a wet pipe sprinkler system, you can set
each module loop input with an Alarm Retard period to compensate for water pressure surges.
Notice!
For all other types of fire alarm applications, set the Alarm Retard to zero.
3.2
Alarm Retard and Reset Delay
When using Alarm Retard, set the Reset Delay time at a time interval approximately 50%
longer than the Alarm Retard period to ensure an alarm is generated in case of alarm valve
fanning. The Reset Delay progressively shortens the Alarm Retard cycle when the sprinkler
loop continuously alternates between alarm and restoral.
Setting the Alarm Retard
Notice!
Only use the Alarm Retard for wet pipe sprinkler systems using waterflow switches without
retard. For all other applications, adjust the Alarm Retard to zero (fully counterclockwise).
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2.
3.
2020.04 | 04 | F.01U.362.295
For each input loop requiring Alarm Retard, use a screwdriver to set an appropriate
retard time for that loop. Fully clockwise represents a maximum retard time of
approximately 90 seconds.
When using the Alarm Retard, set the Reset Delay to compensate for alarm valve fanning
conditions.
Test the Alarm Retard period and the Reset Delay.
Installation instructions
Dual Class A Initiating Circuit Module
Bosch Security Systems, Inc.
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