It is a method that is applied in cases where the outdoor air quality is very good and the indoor air quality is very bad, taking into account energy savings. In such an application, command elements of the panel (Fig.18) and AHU (Fig.19) are arranged by Marine Engineer.


Figure.18 Air handling unit control panel arranged for 100% fresh air and cooling


Figure.19 Air handling unit running for 100% fresh air and cooling


Table.5 Command-and-control elements on panel arranged for 100% fresh air and cooling

Sq. Element                Setting/Monitoring                              Condition

1.      Command             Shift Power switch                                ON

2.      Control                  Monitor Power lamp lits                        WHITE

3.      Control                  Monitor Phase lamps lit                        RED, GREEN, YELLOW

4.      Control                  Monitor Alarm lamps lit                         WHITE

5.      Command             Set control switch                                 MAN    

6.      Command             Set AHU start time                                08h 30m

7.      Command             Set AHU stop time                               17h 30m

8.      Control                  Monitor outdoor air temperature             7 oC

9.      Control                  Monitor outdoor air humidity                  50%

10.   Control                  Monitor outdoor air quality                    95%

11.   Command             Set room thermostat temperature          23

12.   Command             Set room air humidity                            55%

13.   Command             Set room thermostat air quality              80%

14.   Command             Set RAD                                              100%   

15.   Control                  RAD opens and lits                              100%    , GREEN

16.   Command             Set EAD                                              100%

17.   Control                  EAD opens and lits                               100%    , GREEN

18.   Command             Set FAD                                               100%   

19.   Control                  FAD opens and lits                               100%    , GREEN

20.   Command             Set SAD                                              100%   

21.   Control                  SAD opens and lits                               100%    , GREEN

22.   Command             Set MAD                                              0%

23.   Control                  MAD close and lits                               0%, RED

24.   Command             Click on button                                     START

25.   Control                  Monitor START button lits                     GREEN  

26.   Control                  Monitor Aspirator voltage analog           380  

27.   Control                  Monitor Aspirator voltage digital             380  

28.   Control                  Monitor Aspirator current analog           25

29.   Control                  Monitor Aspirator current digital             25  

30.   Control                  Monitor Aspirator speed analog             850  

31.   Control                  Monitor Aspirator speed digital              850  

32.   Control                  Monitor Ventilator voltage analog          380  

33.   Control                  Monitor Ventilator voltage digital           380  

34.   Control                  Monitor Ventilator current analog           25  

35.   Control                  Monitor Ventilator current digital             25  

36.   Command             Set Aspr. and Vent. fan speed              850

37.   Control                  Monitor Ventilator speed analog             850  

38.   Control                  Monitor Ventilator speed digital 8          50

39.   Control                  Monitor Heating valve motor lits            RED

40.   Control                  Monitor Heating valve lits                      RED    

41.   Control                  Monitor Cooling valve motor lits             GREEN

42.   Control                  Monitor Cooling valve lits                      GREEN

43.   Control                  Monitor Humid valve motor lits             GREEN

44.   Control                  Monitor Humid valve lits                        GREEN

45.   Control                  Monitor De-humid valve motor lits         RED

46.   Control                  Monitor De-humid valve lits                   RED

47.   Control                  Monitor last heating valve motor            GREEN

48.   Control                  Monitor last heating valve lits                GREEN

49.   Control                  Monitor outdoor Temperature                7

50.   Control                  Monitor outdoor air humidity                  50

51.   Control                  Monitor outdoor air quality                    95

52.   Control                  Monitor return air temperature               28

53.   Control                  Monitor return air humidity                    70

54.   Control                  Monitor return air quality                       45

55.   Control                  Monitor air filter-in pressure                   1.1

56.   Control                  Monitor air filter-out pressure                 1.2

57.   Control                  Monitor heating coil-in temp.                 7

58.   Control                  Monitor heating coil-out temp.               25

59.   Control                  Monitor cooling coil-out temp.               25

60.   Control                  Monitor humidity                                   55

61.   Control                  Monitor Supply air temperature              23

62.   Control                  Monitor Supply air humidity                   55

63.   Control                  Monitor Supply air quality                      80

Command                    Set control switch                                 AUTO



Last modified: Monday, 3 April 2023, 9:01 PM