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 TM 55-1925-273-10-1
0036 00
DOOR ALARM SYSTEM
GENERAL
The door alarm system consists of alarms located in the radio room, arms stowage room, the main deck fan room, and the
freezer. The radio room door and arms stowage alarms alert the pilothouse to entry to the radio room or fan room, high
temperature in the arms stowage room, or activation of the arms stowage room sprinkler system. The freezer alarm alerts the
crew when the freezer alarm has been activated. Refer to figure 4 for a block diagram of the radio room, arms stowage, and
the main deck fan room door alarms and figure 5 for a block diagram of the freezer alarm.
PILOTHOUSE
MAIN DECK FAN ROOM
FROM 01
DOOR
& 02 LEVEL
ALARM
ALARM
AND MAIN DECK
SWITCHBOARD
SWITCH
EMERGENCY
LIGHTING
PANEL 1
ARMS
RADIO ROOM
STOWAGE
ROOM
FROM 01
& 02 LEVEL
AND MAIN DECK
EMERGENCY
LIGHTING
PANEL 1
THERMOSTAT
WATER
DOOR
ROTARY
SWITCH
ALARM
SNAP
SWITCH
SWITCH
Figure 4. Radio Room, Arms Stowage, and Main Deck Fan Room Door Alarm Block Diagram
RADIO ROOM DOOR ALARM SYSTEM
The radio room door alarm system uses 120 Vac supplied from the 01 & 02 level and main deck emergency lighting panel
No. 1. When the door to the radio room is open, an alarm buzzer and indicator on the alarm switchboard located in the
pilothouse is activated. A manual rotary snap switch is provided inside the radio room to disable the radio room door alarm.
ARMS STOWAGE ALARM SYSTEM
The arms stowage alarm system is a 120 Vac alarm system. Power is supplied from the 01 & 02 level and main deck
emergency lighting panel No. 1. Two sensors are provided, a high temperature sensor and a sprinkler sensor. The high
temperature sensor detects unusually high temperature in the arms stowage room and activates the pilothouse sprinkler
system alarms. The sprinkler sensor is a water flow switch that is installed on the downstream side of the sprinkler control
valve. When the sprinkler control valve opens, water passes through the sprinkler control valve and through the water switch
to the sprinklers. Water passing through the water switch activates the pilothouse alarms. Both audible and visual alarms are
provided in the pilothouse at the alarm switchboard.
0036 00-5
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