MAN2285-9
Page 10
4.12
Day start / Night start
Day/Night switching tab
These values are the times to the nearest hour at which the day/night switching is desired to take place on the
detector. Entries are made in 24-hour format, e.g. 19 for 7pm. Day and night switching is intended so that the
detector may automatically select a different sensitivity when the protected area is unoccupied and fewer
contaminants are being produced. ClassiFire automatically detects the change in smoke level after the
protected area is left, and if the time at which this happens is within + 70 minutes of the programmed
switchover time it selects the night-time histogram. This means that changes in time setting, e.g. changing to
summer time, may be ignored as the detector will take this into account. The default times for day and night
start are 08:00 and 19:00 respectively.
Note that if the environment actually becomes more contaminated during the night period for any reason then
ClassiFire will adapt to that too, reducing the night-time sensitivity.
4.13
Disable Day / Night switching
Day/Night switching tab
If day/night switching is not desirable, the Disable day/night switching box may be ticked to leave the detector
permanently in day mode.
4.14
Remote functions
Alarm actions tab, Remote input subgroup
These functions have no current use on the FastSense 25 but are reserved for future expansion purposes.
4.15
Programmed Isolate
Alarm actions tab
When this function is ticked the controller will not generate alarms and will not indicate a fault condition on any
FACP which is connected, e.g. for use during detector maintenance. The “Fault” light will be illuminated on the
detector front panel. The isolated condition will be disabled automatically after 7 days if not manually disabled.
This function is disabled by default.
4.16
Latching alarms
Alarm actions tab
When this function box is ticked it requires a reset from the controlling computer to clear an alarm condition. If
unticked, the alarm signal is extinguished as soon as the alarm condition ends. This is the factory default
setting.
4.17
Latching faults
Alarm actions tab
When this function box is ticked it requires a reset from the controlling computer to clear a fault condition. If
unticked, the fault signal is extinguished as soon as the fault condition ends. This is the factory default setting.
4.18
Cascading alarms
–
Alarm actions tab
Ticking this function box means that only when the detector’s controller has gone into Pre
-Alarm does the
controller start counting down the main Fire delay i.e. the time delays on Pre-Alarm and Fire 1 are cumulative.
The Aux alarm is not included in the cumulative delay since it may be set to a higher level than either the Pre-
Alarm or Fire 1 levels. This function is enabled by default.
