Hochiki FIRElink-100 - Manual (Page 14)

Page 14 of 40 FIRElink-100 – Installation Manual
© 2010 Hochiki Europe (UK) Ltd
9-5-0-345/ISS4/OCT10
1.11 Flow Monitoring Tab
1.11.1 Flow Rate
This function is for display purposes only, and shows a value corresponding to the current airflow through
the detector.
1.11.2 Flow High Limit
This value is the level above which airflow needs to increase to trigger a fault indication (which may
indicate a loose or damaged inlet pipe). Flow low limit and Flow high limit parameters are automatically
set up on initial power-up.
1.11.3 Flow Low Limit
This value is the level below which airflow needs to be reduced to trigger a fault reading (which may
indicate a blocked pipe). Flow low limit and Flow high limit parameters are automatically set up on initial
power-up.
1.11.4 Flow Fault Delay
This feature requires the Remote Control Software version 3.2 or later, available from the Hochiki Europe
Technical Support Department ([email protected]).
The default flow fault thresholds on the FIRElink-100 are set to meet the stringent airflow monitoring
requirements of EN54-20, with a default flow fault delay of 30 seconds. This may lead to unwanted flow
faults being generated when local conditions cause short-term variations in airflow. To help alleviate such
issues, the flow fault delay is programmable from 30 to 240 seconds. The flow level needs to be above
the high flow threshold or below the low flow threshold throughout the delay period for a fault to be
generated.
NOTE: When setting the value of this function, it is important to take into account that the control unit (for
example, fire panel) may not react immediately to a trouble signal being generated by the
detector, and this will add to the total fault response time of the system.
The function value must be chosen so that the total time between the detector entering a fault condition
and a fault signal being generated by the panel meets the requirements of local or national fire
regulations. The maximum allowable response time for EN54-20 compliance is 300 seconds, and that for
NFPA 72 compliance is 200 seconds.
As an example: in the latter case, if the flow fault delay were set to 180 seconds (within the limit), but the
fire panel did not generate a fault indication for another 25 seconds, the total response time of 205
seconds means the system would not comply with the regulations.
If documented figures are unavailable for the fire panel reaction time, compliance with reaction time
regulations may only be verified by post-installation testing.
1.12 Miscellaneous Tab
1.12.1 Access Code
This is the access code required to amend programmable parameters. The default code is 0102. Once
the appropriate code is entered it may be changed here to any four digit number to limit unauthorised
access.