Fire Fighting Enterprises FIRERAY 3000 - Manual (Page 13)

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The system will automatically compensate for dust build-up by changing the Compensation
Level. However, it is recommended that the Receiver lenses are cleaned periodically with a soft
lint-free cloth.
The system should be isolated from the Fire Control Panel before cleaning takes place. After
cleaning, verify that the system is operating normally by following the Alignment procedure and
the Fire and Fault Tests described in this User Guide.
16. Cleaning The System