Hochiki FIRElink-NANO - Manual (Page 14)

Page 14 of 21 FIRElink-NANO Air Sampling Detector – Installation and User Manual
© 2010 Hochiki Europe (UK) Ltd 9-5-0-425/ISS1/JUL10
8.3 Fixed Alarms Enabled
Switches the artificial intelligence system off, locking sensitivity to that set at initial setup. This de-
activates the dust filter monitoring system (not recommended).
NOTE: Enabling this feature means that nuisance alarms due to fluctuations in ambient pollution levels
become more likely.
8.4 Flow Limit Offset
Sets the sensitivity of the airflow monitoring system. A small offset makes the system very sensitive to air
flow changes. EN 54-20 systems must react to a ±20% change in airflow, which equates to a change in
flow sensor output of +5 (this refers to a percentage of flow sensor full output and is not a direct measure
of airflow). Areas with fluctuating air pressures may require a less sensitive setting.
NOTE: Changing the flow limit offset starts a new flow calibration set up.
8.5 Flow Delay
Sets the period during which abnormally high or low air flow conditions must continue before the unit
indicates a “Flow” fault.
8.6 Input Select
When this switch is set to the factory default OFF position, the detector input terminals may be connected
to a power supply fault output relay so as to generate a detector “Fault” condition if the power supply
Fault relay contacts open. If power supply monitoring is not required, either a wire link can be placed
across the input terminals, or this switch can be set to ON to remove the fault.
Setting the switch to ON enables the ClassiFire
®
Override feature. This reduces detector sensitivity by
50% as long as there is a short circuit across the input terminals, e.g. controlled by a key switch. This can
be used to prevent unwanted Alarms during planned intervals of smoke release, e.g., incense burning
during a church service.
NOTE: If a wire link is fitted across the INPUT terminals, it is important that this switch be set to OFF, or
the detector sensitivity will be dramatically reduced by the ClassiFire
®
Override function being
permanently enabled.
8.7 Auto Calibration
Automatically starts a new FastLearn cycle when the detector is powered up. This may be disabled if the
previous settings need to be retained.
NOTE: if this function is enabled, the unit will also recalibrate the flow sensors after power up.