Bell Circuits

TM-55-1930-209-14P-17 Water Purification Barges (NSN 1930-01-234-2165) Miscellaneous Equipment Dayroom Workshop Access and Sanitation Systems Manual
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7.12 Alarm Test/Trouble Test A single switch with a center-off position is provided on the front panel to test all of the individual line detecting module functions for both alarm and trouble. a. Raising the switch to the upper position simulates the presence of smoke in all line detector modules. b. Operation of alarm test results in all line detector modules going into the alarm condition as well as the production of a common alarm output from the main panel (common alarm output is the illumination of common alarm lamp plus the energizing of the smoke alarm bells in the wheelhouse and engine room). Common and line alarm lamps are illuminated on the repeater panel (when used). c. Simulated alarms should be cancelled by operation of reset switch. It is recommended that test conditions not be left in effect for a longer period of time than necessary to ensure proper annunciation. d. Lowering of the test switch to the trouble position simulates a trouble condition in all line detector modules. e. Operation of the trouble test switch, while held in the test position, results in the display of the amber trouble signal on the front of each line detector module as well as the common trouble signal on the electronic cabinet drawer front (common trouble signal represents illumination of the common trouble lamp plus the energizing of the trouble buzzer at the main detector cabinet and the common signal device at the remote repeater cabinet respectively). f. Trouble signals do not latch. Therefore, the trouble indication generated by trouble tests will persist only as long as the switch is depressed. 7.13 Bell Circuits Two bell circuits are provided; one for the bell in the engine room and one for the bell in the wheelhouse, as required by U.S. Coast Guard regulations. Both bell circuits are continually supervised by the detector cabinet for presence of the bells in the circuit, the wiring of the bells, circuit continuity, and both ground fault and short circuit conditions. The bell circuit faults produce the illumination of the alarm bell trouble LED indicator and the common trouble lamp. A common trouble condition operates the trouble buzzer at 7-9

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