LaserNET Program User's Guide
September 2003
TM0048
6-9
Figure 6-9. Faults Window, IIM and Direct Connection
6-5.3.1
AIRFLOW DEVIATION/NORMALIZING AIRFLOW
This feature is used to show the deviation of airflow from the normal airflow level.
1. Check the initial Airflow Deviation number on start-up. The number will show the amount (+/-) the
system is from the norm. Being that each system is different, a number other than zero deviation from
the norm will most likely appear.
2. Use the Normalize Airflow function to set the system's deviation to "zero deviation from the norm". If the
Normalized Airflow falls either too high or too low to normalize, a fault message will appear and normali-
zation will not be allowed. If a fault message occurs, the piping network must be recommissioned. Refer
to the "SNIFF" Program and the HART XL Installation Manuals, or contact Kidde Fire Protection for
further help.
Press the
<Normalize Airflow>
button to normalize the current airflow (this will change the Airflow
Deviation to zero). A dialogue box will appear displaying the offset due to the previous normaliza-
tion. Continuing with the normalization process will offset the current airflow deviation as long as it
is within the bounds set by the system thresholds. If the deviation is within the threshold bounds, the
normalization process can be continued and the airflow deviation will be offset to "0". For example,
the airflow deviation was 2, after the normalization process, the normal deviation becomes zero and
the offset becomes 2. Select
<Yes>
to continue.
A second caution message will appear telling users to verify the suction pressures and transport
times with "SNIFF" before continuing. Select
<OK>
to continue or
<Cancel>
to return to the Faults
window.
6-5.3.2
LOW AIRFLOW THRESHOLD
This feature is used to generate a fault in the event of a blocked air-sampling pipe or a nonoperational fan.
The following notes apply to setting this threshold:
Airflow can be highly variable and will fluctuate with changes in temperature, humidity or pressure within
the monitored hazard.
The airflow threshold should be set about -20 below the "normal" airflow for the system.
The threshold can be set in increments of one with -40 absolute value as the minimum.
The window will display the current or factory default settings. To change:
1. Select the Threshold field in the Low Airflow box. Enter the new value.
2. Select
<OK>
to save this setting.
6-5.3.3
HIGH AIRFLOW THRESHOLD
This feature is used to generate a fault condition in the event of a disconnected air-sampling pipe. The
following rules apply to setting this threshold.
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