Manual

Page 14 of 21 FIRElink-NANO Air Sampling Detector – Installation and User Manual

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.