Fault Conditions; Maintenance - Honeywell FS20X Series User Manual

FS20X Fire and Flame Detectors

Fault Conditions

When a fault (trouble) condition occurs, the yellow LED will illuminate� See Figure 3-6 for the location of
the Yellow LED�
Figure 29� Yellow LED location
Fault condition output
Fault relay activation
4-20mA output
4-20 mA (sink) output 3
2 mA (self-test/window obscuration fault)
0 mA (all other faults)
4-20 mA (source) output
4
2 mA (self-test/window obscuration fault)
0 mA (all other faults)
RS-485 output
RS-485 FireBusII fault notification
RS-485 Modbus fault notification
Causes of fault conditions:
● Under voltage input power (<18 VDC)�
● Over voltage input power (>32 VDC)�
● Over temperature (>85 °C or 185 °F for the standard version)�
● Under temperature (<-40 °C or -40 °F for the standard version)�
● One or more microprocessor failures�
● One or more relay coil failures�
● Communication fault�
● Electronic self-test failure�
● Dirty window (flashing yellow LED)
3 only one active fault output from these three
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FS20X Fire and Flame Detectors

Maintenance

After the detector is installed and commissioned, little maintenance is required� However, a test of the
entire fire detection system should be performed periodically, depending on the application� Additionally,
semi-annual or quarterly testing should be performed with the appropriate Honeywell Analytics test lamp
(TL-1055 or TL-2055) to ensure the integrity of the system�
Establish a periodic cleaning schedule� Some industrial environments may require more frequent cleaning
of the detector's window than others�
Clean the detector's window any time it is dirty or contaminated, every time the enclosure lid is handled, if
the detector fails the built-in test, or if the detector fails an end-to-end test with the test lamp� If necessary,
clean the detector module sensors whenever the detector has been disassembled�
Use a blast of clean air or an oil-free cloth to clean the enclosure window (oil degrades the performance of
UV detectors)� Do not use commercial or silicone-based window cleaning products; they also will degrade
the detector's performance� Occassional use of a solvent such as 6% isopropyl alcohol is acceptable� No
disassembly of the detector is required for this�
WARNING
!
To avoid electrostatic discharge, wipe the enclosure only with a damp cloth�
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