The full exhaust method is applied for places that do not need air conditioning but constantly need fresh air. If fresh air is required to enter the place where full exhaust is made, it is operated together with fresh air fans. Since there will be some pressure drop in places where full exhaust operation is performed with forced aspiration, the escaping of polluted air to other parts of the ship is prevented. Individual control panels (Figure.7) are provided for each exhaust fan (Figure.8).

When the fan start button is pressed, all air dampers automatically open 100% first. It turns off automatically at the end of the programmed time or when the smoke sensor is activated due to a possible fire in the air intake room.

The amount of exhaust is provided by a frequency-controlled electric motor. Any malfunction in the main components will appear in the alarm section while the exhaust fan is running. In such cases, the exhaust fan automatically stops and all dampers close 100%.

The running values of the exhaust fan, started after all the command elements on the panel are adjusted by Marine Engineer, must be monitored by means of control elements.


Figure.7 Exhaust fan control panel layout



Figure.8 Exhaust fan operation layout


Table.1 Setting and monitoring of exhaust fan command-and-control elements

 

Sq. Element           Setting/Monitoring                  Condition

Control                   Monitor alarm bulbs lit              WHITE

Control                   Monitor RST bulbs lit                RED, GREEN, YELLOW

Command              Shift power switch                     ON

Control                   Monitor power bulb lits              WHITE

Control                   Monitor outdoor air quality        85 %

Control                   Monitor indoor air quality           45 %

Command              Set required air quality              85 %

Command              Set fan start time                      10:30

Command              Set fan stop time                      12:00

Command              Shift control switch                   AUT

Control                   Monitor RAD position and lits    OPEN, GREEN

Control                   Monitor EAD position and lits    OPEN GREEN

Control                   Monitor FAD position and lits

Control                   Monitor MXD position and lits

Control                   Monitor CAD position and lits

Command              Push Start button, lits               GREEN

Control                   Monitor fan motor bulb lits         GREEN

Control                   Monitor fan motor voltage         380 Volt

Control                   Monitor fan motor current          25 Amper

Control                   Monitor fan speed                    200 RPM


Last modified: Monday, 3 April 2023, 4:05 PM