FIRElink-25 – Installation Manual
Page 11 of 40
©
2010 Hochiki Europe (UK) Ltd
9-5-0-344/ISS4/OCT10
2.2.5 LDD
Enable
When this function is ticked, Laser Dust Discrimination (LDD™) increases the response time of the
detector slightly, whilst greatly reducing the likelihood of nuisance alarms due to dust ingress. LDD may
be disabled in very clean rooms for a slightly faster response to smoke by setting this function to unticking
the box. This function is enabled by default.
NOTE: Disabling LDD is not recommended for areas other than manufacturing clean rooms, due to the
increased probability of nuisance alarms in most other operating environments.
2.2.6 FastLearn
Enable
If the detector is in FastLearn mode, unticking this box will stop the FastLearn process. Using the function
in this way is neither recommended nor supported by Hochiki Europe (UK) Limited.
Ticking the box will start a FastLearn at any time. The green “OK” LED on the front of the detector will
flash for the fifteen minutes that it takes for the FastLearn process, and will then change to constant
illumination to indicate that the FastLearn is complete.
Note: It will take a further 24 hours after the FastLearn for full sensitivity to be reached, unless
Demonstration Mode has been initiated (See section 3.10, “Demo mode”). It is essential for proper
functioning that the detector not be left in Demonstration mode, and that it be allowed to complete
the 24-hour learning period. To cancel demo mode, tick this box or power down and restart the
detector to initiate FastLearn mode.
2.2.7
Auto FastLearn Enable
When enabled, this function ensures that if the detector is powered off for any reason (e.g. for
maintenance or to be moved to a new area), a FastLearn is commenced automatically on power-up.
There may be occasions when it is desirable to power down the detector for short periods of time, and it
is highly likely that ambient contaminant levels will be the same on power-up. Under these circumstances
it may not be desirable that the detector should to go through the whole learning process again. To this
end, this function can be unticked before power-down, whereupon it will return to the original settings on
power-up. This function is enabled by default.
2.2.8 ClassiFire
3D
If this function is ticked, then the detector will ignore any pre-set time delays in the event of an
unacceptably rapid increase in smoke density, thereby minimising response time to 'rapid growth' fires.
This function would normally only be used where there were long time delays programmed on the alarm
levels. This function is disabled by default.
2.2.9 Demo
Mode
Demonstration mode is an operating mode whereby the normal 24-hour learning period is bypassed, so
that the detector can reach high sensitivity after only the 15 minute FastLearn period. This can be used so
that initial smoke testing and other commissioning can be carried out.
However, it must be understood that, since the alarm levels will be based solely upon the
sparse data gathered during the FastLearn period, there is a risk of nuisance alarms due
to normal variations in ambient smoke levels. For this reason, the detector should not be
left in Demo mode for normal use when connected to a fire panel.
