Fault Conditions; Maintenance - Honeywell FS20X Series Installation Manual And Operating Manual

3.6

Fault Conditions

When a Fault (Trouble) condition occurs, the Yellow LED will illuminate. See Figure 3-6 for the location of
the Yellow LED.
Detector Module, Front View
Fault (Trouble) conditions can be caused by:

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 Lens (Yellow LED flashes, the Yellow LED is ON [solid] for all other Faults).
3.7

Maintenance

After the FS20X Detector is installed and commissioned, there is little maintenance required. However, a
complete "end-to-end" test of the entire fire detection system should be performed periodically depending on
the application. Additionally, semi-annual or quarterly testing should be performed, using the correct
Honeywell Analytics Test Lamp, to ensure the integrity of the entire fire protection system.
The optical window (lens) of the Model FS20X Detector should be clean in order to ensure the Detector is
operating properly at all times. It may be necessary to establish a periodic cleaning schedule. Some industrial
environments may necessitate more frequent cleaning of the Detector's optical surfaces than others.
Clean the window of the FS20X Detector each time the housing lid is handled, the window appears dirty or
contaminated, fails the Built-In-Test, or the Detector fails an end-to-end test with the FSC hand-held portable
Test Lamp (TL-1055 or TL-2055). If necessary, clean the Detector Module Sensors each time the Detector
has been disassembled for wiring or replacement.
Use a blast of clean air or an oil-free cloth to clean the enclosure window. Oil degrades the performance of UV Detectors.
Occassionally, the use of a solvent, such as alcohol is acceptable. No disassembly of the Detector is required.
DO NOT USE SILICONE-BASED OR COMMERCIAL WINDOW CLEANING PRODUCTS.
THESE WILL DEGRADE THE MODEL FS20X DETECTOR PERFORMANCE.
WARNING – Potential Electrostitic Charge, wipe enclosure only with a damp cloth
Honeywell
Installation Guide and Operating Manual // Model FS20X™ Series
Figure 3-5
The Detector has the following outputs with a
Fault condition:

Fault Relay activation

4-20 mA (sink) Output
2 mA (Self-Test/Lens Obscuration Fault)
0 mA (All Other Faults)

4-20 mA (source) Output
2 mA (Self-Test/Lens Obscuration Fault)
0 mA (All Other Faults)

RS485 FireBus
II

RS-485 ModBus Fault Notification
3 Only One Active Fault output from this group
3
3
3
Fault Notification
3
19