The air circulation method is applied in places that do not need a revitalization process, but need continuous air flow regardless of quality. If air circulation is required in the space, air quantity and speed become important. There are separate control panels (Fig.11) for each circulation air fan (Fig.12).

 When the circulation air 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 circulated room.

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

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


Figure.11 Circulation fan control panel layout



Figure.12 Circulation fan operation layout


Table.3 Setting and monitoring of circulation fan command-and-control elements

Sq. Element                Setting/Monitoring                  Condition

1.      Control                  Monitor alarm bulbs lit              WHITE

2.      Control                  Monitor RST bulbs lit                RED, GREEN, YELLOW

3.      Command             Shift power switch                    ON

4.      Control                  Monitor power bulb lits              WHITE

5.      Control                  Monitor outdoor air quality        85 %

6.      Control                  Monitor indoor air quality           45 %

7.      Command             Set required air quality              85 %

8.      Command             Set fan start time                      10:30

9.      Command             Set fan stop time                      12:00

10.   Command             Shift control switch                   AUT

11.   Control                  Monitor RAD position and lits    OPEN, GREEN

12.   Control                  Monitor EAD position and lits    …

13.   Control                  Monitor FAD position and lits    …

14.   Control                  Monitor MXD position and lits   …

15.   Control                  Monitor CAD position and lits    OPEN, GREEN

16.   Command             Push Start button, lits               GREEN

17.   Control                  Monitor fan motor bulb lits         GREEN           

18.   Control                  Monitor fan motor voltage         380 Volt

19.   Control                  Monitor fan motor current          25 Amper

20.   Control                  Monitor fan speed                    200 RPM


Last modified: Monday, 3 April 2023, 8:10 PM