Air handling unit control panel with command-and-control elements
The ventilation, purification and revitalization of the air is managed by a controller (Figure.16). The Air Handling Unit (AHU) (Fig. 17) operates automatically to provide the required ambient conditions. The operating program of the air handling unit, exchange air amount, speed, quality, temperature and humidity are set by the operator using the command elements on the control panel. The running values are controlled by means of monitors on control panel.
Ambient air, whose characteristics deviate from the set values, is drawn into the suction cell of the air handling unit through the aspirator fan and air ducts in order to be filtered and revitalized. Exhaust, mixed air and fresh air dampers are automatically adjusted by the controller, taking into account the outdoor and indoor air quality, for the desired air mixing ratio. The mixture air obtained is cleaned from the suspended materials by passing through the air filter. The cleaned air is brought to the desired psychometric values by heating, cooling, dehumidification, humidification and post-heating coils equipped with 3-way motorized valves. The air, which is brought to life by filtering, is sent back to the environment that air-conditioned.
Figure.16 Air handling unit control panel with command-and-control elements
Figure.17 Air handling unit with command-and-control elements
Table. 4 Setting and monitoring of air handling unit command-and-control elements
Sq. Element Setting/Monitoring Condition
1. Command Shift Power switch …
2. Control Monitor Power lamp lits …
3. Control Monitor Phase lamps lit RED, GREEN, YELLOW
4. Control Monitor Alarm lamps lit …
5. Command Shift control switch OFF
6. Command Set AHU start time …h …m
7. Command Set AHU start time …h …m
8. Command Click on button START
9. Control Monitor Outdoor air quality …%
10. Control Monitor Indoor air quality …%
11. Command Set Required air quality …%
12. Command Set RAD …%
13. Control RAD opens …%
14. Command Set EAD …%
15. Control EAD opens …%
16. Command Set FAD …%
17. Control FAD opens …%
18. Command Set SAD …%
19. Control SAD opens …%
20. Command Set MAD …%
21. Control MAD opens …%
22. Command Click on button START
23. Control Monitor START button lits GREEN
24. Control Monitor Aspirator voltage analog …
25. Control Monitor Aspirator voltage digital …
26. Control Monitor Aspirator current analog …
27. Control Monitor Aspirator current digital …
28. Control Monitor Aspirator speed analog …
29. Control Monitor Aspirator speed digital …
30. Control Monitor Ventilator voltage analog …
31. Control Monitor Ventilator voltage digital …
32. Control Monitor Ventilator current analog …
33. Control Monitor Ventilator current digital …
34. Control Monitor Ventilator speed analog …
35. Control Monitor Ventilator speed digital …
36. Control Monitor Heating valve motor lits …
37. Control Monitor Heating valve lits …
38. Control Monitor Cooling valve motor lits …
39. Control Monitor Cooling valve lits …
40. Control Monitor Humid valve motor lits …
41. Control Monitor Humid valve lits …
42. Control Monitor De-humid valve motor lits …
43. Control Monitor De-humid valve lits …
44. Control Monitor outdoor Temperature …
45. Control Monitor outdoor Air quality …
46. Control Monitor outdoor Humidity …
47. Control Monitor indoor Temperature …
48. Control Monitor indoor Temperature …
49. Control Monitor indoor Temperature …
50. Control Monitor Air filter in-pressure …
51. Control Monitor filter air-in sensor lits …
52. Control Monitor filter air-out sensor lits …
53. Control Monitor heating coil in-Temp. …
54. Control Monitor heating coil out-Temp. …
55. Control Monitor Cooling coil in-Temp. …
56. Control Monitor Humidity …
57. Control Monitor Supply air temperature …
58. Control Monitor Supply air quality …
59. Control Monitor Supply air humidity …
60. Command Adjust Aspirator. and Ventilator fans speed …