This method is applied in cases where the outdoor air quality is better than the indoor air quality, in order to reduce the indoor air CO2 amount and to increase the O2 amount, taking into account the energy saving. In such an application, command elements of the panel (Fig.20) and AHU (Fig.21) are arranged by Marine Engineer.


Figure.20 Air handling unit control panel arranged for 25% fresh air and heating


Figure.21 Air handling unit running for 25% fresh air and heating


Table.6 Command-and-control elements on panel arranged for 25% fresh air and heating

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                                  06h 30m

7.      Command             Set AHU stop time                                  20h 30m

8.      Control                  Monitor outdoor air temperature            7 oC

9.      Control                  Monitor outdoor air humidity                80%

10.   Control                  Monitor outdoor air quality                    55%

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                                                  25%

17.   Control                  EAD opens and lits                               25%     , GREEN

18.   Command             Set FAD                                                  25%

19.   Control                  FAD opens and lits                               25%     , GREEN

20.   Command             Set SAD                                                  100%

21.   Control                  SAD opens and lits                               100%    , GREEN

22.   Command             Set MAD                                                  75%

23.   Control                  MAD close and lits                                 75%     , GREEN         

24.   Command             Click on                                                   START button

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           20

29.   Control                  Monitor Aspirator current digital            20  

30.   Control                  Monitor Aspirator speed analog             450  

31.   Control                  Monitor Aspirator speed digital              450  

32.   Control                  Monitor Ventilator voltage analog          380  

33.   Control                  Monitor Ventilator voltage digital           380  

34.   Control                  Monitor Ventilator current analog           20  

35.   Control                  Monitor Ventilator current digital             20

36.   Command             Set Aspr. and Vent. fan speed                  45

37.   Control                  Monitor Ventilator speed analog            450

38.   Control                  Monitor Ventilator speed digital             450

39.   Control                  Monitor Heating valve motor lits            GREEN

40.   Control                  Monitor Heating valve lits                       GREEN

41.   Control                  Monitor Cooling valve motor lits            RED

42.   Control                  Monitor Cooling valve lits                       RED

43.   Control                  Monitor Humid valve motor lits              RED

44.   Control                  Monitor Humid valve lits                         RED

45.   Control                  Monitor De-humid valve motor lits        GREEN

46.   Control                  Monitor De-humid valve lits                   GREEN

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                 80

51.   Control                  Monitor outdoor air quality                    55

52.   Control                  Monitor return air temperature              18

53.   Control                  Monitor return air humidity                    70

54.   Control                  Monitor return air quality                       65

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                  15

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






Last modified: Tuesday, 11 April 2023, 10:08 PM