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Response to Fault Indication
If a failure is found, the detector indicates by:
•
Fault
relay:
•
Opens in wiring option 1, 2, and 4
•
Closes in wiring option 3 and 5
•
0-20mA: indicates Fault (0mA or 2mA) in wiring option 1, 2, 3
•
LED – Yellow flashes (4 Hz)
Correcting the Fault
The fault indications remain until the detector’s power is removed. The fault indications
return if the fault is still found when power is restored.
1.6.2 BUILT-IN-TEST
(BIT)
The detector’s Built-In-Test (BIT) also checks the following:
•
Electronics
circuitry
•
Sensors
•
Window
cleanliness
The detector can be set to perform the BIT in the following modes:
•
Automatically and manually
•
Manually
only
Note:
In Manual BIT, the outputs may also be tested and Control System ‘inhibit’ should
be applied if this could initiate other systems.
1.6.2.1
HOW THE BIT OPERATES
•
The detector's status remains unchanged if the result of a BIT is the same as the
current status (NORMAL or BIT Fault)
•
the detectors’ status is changed (from Normal to BIT Fault or vice versa) if the BIT
differs from the current status
Note:
In ‘BIT Fault’ status the detector can continue to detect a fire.
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