D8024/D10024A
Troubleshooting
D8024/D10024A Operation and Installation Guide
© 2002 Radionics
Page 43
50616B
11.3
Sensitivity Mode
•
The commissioning engineer can adjust the sensitivity of both temperature and smoke detectors by
adjusting the threshold at which pre-alarm and fire alarm signals are generated.
•
These alternative thresholds are programmed to operate only at certain times of the day and at all other
times the thresholds will return to normal.
This facility is very flexible. It should only be used in certain specialized applications and with great
care. The default mode is for all detectors to default to the manufacturers recommended alarm
level.
11.3.1
Commissioning Sensitivity Mode
•
Press
2
to select Sensitivity mode from the ‘Day Modes Menu.
The display will prompt
whether the mode is to be
used.
•
Press
No
to inhibit the mode and return to the ‘Day Mode’ menu.
•
Press Yes to enable the mode.
The display will then prompt
the start and end times for the
day period.
•
Press
Yes
to accept and step on.
•
Press
No
to change and then
enter the required start time
using the number buttons.
•
Press
Yes
to accept and step on. Press
No
to change and then enter the required end time using the
number buttons.
There is no restriction on the range of times entered. Any special pre-alarm and fire alarm values
entered for the devices will then be used within the specified period.
11.4
Verification Mode
•
Alarm verification can be used to reduce false alarms by placing a delay on a transient alarm signal received
from a smoke detector. This ‘Retard-reset-restart’ delay time can be set when commissioning the panel.
•
When an alarm is first received from a smoke detector the panel will start an internal timer and attempt to
"reset" the detector. If the detector is still in alarm after the verification timer has expired the control panel
will go into alarm. If the detector is not in alarm at this point, the panel will enter a 60-second "Confirmation
period". Any alarm received during the confirmation period will then be deemed a genuine fire alarm.
The alarm verification feature should not be used as a substitute for proper detector
location/applications or regular system maintenance. Alarm verification features are intended to
reduce the frequency of false alarms caused by transient conditions. They are not intended to
compensate for installation design errors or lack of maintenance.
Keep the verification delay to a minimum. Use the following maximum ‘Retard-reset-restart’ times
for compliance with the appropriate standards:-
UL864
40 seconds
EN54
5 seconds
