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5.2 Testing
The detector has a Built-In-Test (BIT) capability to ensure proper operation and to make sure that the window
is not dirty. The BIT process runs automatically at startup and periodically during the operation of the
detector. The BIT can also be initiated manually by short circuiting the “Manual BIT” terminal and the “24
VDC (-)“ terminal for one second (see Table 3) or by using the FGD communicator software (connected
through RS-485).
In case of “Dirty Window” fault the detector may still detect flames but at a lower sensitivity.
When “Manual BIT – Alarm Output Test” feature is enabled (see section 3.8), a successful Manual BIT will
activate the following alarm outputs for a few seconds:
1. The led in the front of the detector will turn red.
2. The 0-20mA current output will be set to 20mA.
3. The alarm relay will close.
4. Video will indicate fire.
5. Video recording will be activated.
WARNING
Make sure to disable all fire extinguishing actions or alarms connected to the detector, when the manual
BIT is initiated and the “Manual BIT – Alarm Output Test” is enabled, as the manual BIT will set the 0-20mA
terminal to 20mA and close the alarm relay.
5.3 Maintenance
After powering up, the detector should work maintenance free with the exception of optical window cleaning
and an annual fire detection operational test.
WARNING
The sensor module in the front half of the detector contains no serviceable components and should never
be opened. The terminal compartment at the back is the only part of the housing that should be opened by
the user.
Any violation of these instructions will invalidate the warranty.
5.3.1 Cleaning Procedure
To clean the detector:
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