The full fresh air supply 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, it may be operated together with exhaust fan. Since there will be some pressure increase in places where full fresh air operation is performed with forced air supply, the entering of polluted air from outside is obstructed. Individual control panels (Figure.9) are provided for each fresh air fan (Figure.10).

When the fresh air supply fan start button is pressed, first all air dampers open 100%. They turn off automatically at the end of the programmed time or when the smoke detector in the air-pressed room is activated due to a possible fire.

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

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


Figure.9 Fresh air fan control panel layout

Figure.10 Fresh air supply fan operation layout


Table.2 Setting and monitoring of fresh air supply 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    …

12.   Control                  Monitor EAD position and lits    …

13.   Control                  Monitor FAD position and lits    OPEN, GREEN

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, 4:15 PM