Comelit ILS-2, Manual

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If the access code has been entered (unit unlocked), press and hold the SELECT button for longer than
one second to exit “configuration” mode.
Press and release either the SELECT or CHANGE button (when the unit has exited configuration mode -
code not entered) to view the AIRFLOW on the LED bar chart.
The LED bar chart automatically reverts to displaying the smoke level (analogue value reading) after a few
seconds.
6.2.1 Detector mode
ILS-2 has three different operating modes as illustrated below (1 and 2 are internal detectors):
• Mode 1 (1 only): Single detector
The detector displays the analogue smoke reading value in real time and the unit indicates when the
Alert, Action and Fire thresholds are exceeded.
• Mode 2 (1 OR 2): Two installed detectors operating INDEPENDENTLY from one another.
The unit will show the HIGHEST reading obtained from the TWO detectors and will activate the Alert,
Action and Fire relays when ONE OF THE TWO detectors detects smoke values exceeding the relevant
thresholds. This mode allows detection redundancy and therefore guarantees correct operation even if
one of the detectors becomes faulty.
• Mode 3 (1 AND 2): Two detectors work in tandem (Dual Consent)
The unit will show the LOWEST reading obtained from the TWO detectors and will activate the Alert,
Action and Fire relays when BOTH analogue values from the TWO detectors exceed the relevant
thresholds.
Notes: Mode 3 is not permitted in installations which require VdS approval.
ILS-2 is supplied in standard mode 1. If required jointly, the second detector will be supplied in Mode 2. If the
unit only houses one detector and mode 3 is programmed, a Detector Fault will be signalled.
6.3 Setup notes
The Fan Speed , Airflow Limits and Flow Sensitivity must be configured BEFORE unit calibration and
testing.
The following guidelines should assist in the commissioning of the system.
6.3.1 Fan Speed
The Fan Speed should be set as high as possible to achieve the fastest transport time from the sampling holes
to the sensor, which is especially important for longer pipe lengths that must conform to the requirements of
EN54-20 (please refer to Section 4.8:
Standard pipe configurations ).
However, a balance also needs to be achieved between unit performance and power
consumption. Table 11-1 provides the values necessary for this evaluation.
6.3.2 Airflow Fault signalling delays
When the airflow limits are exceeded, a Flow Fault indication will appear after a programmable time period.
The default Flow Fault indication delay time is approximately 30 seconds. Once the airflow reverts to a normal level,
the Flow Fault will be cleared within 18 seconds.
Table 6-2 lists the available values for this parameter.
In environments where the airflow may be affected by sudden temperature or pressure
changes, it may be necessary to increase the delay time accordingly.