47.0201 - Heating, Ventilation, Air Conditioning, and Refrigeration (2007)

Technical Standards

VII. Commercial Air conditioning

B. Competencies:

1. Describe the function of, and install a lockout relay in a circuit.

2. Describe the operation of and install a contactor.

3. Describe, test, and install a run and start capacitor.

4. Describe and install a compressor potential start relay.

5. Describe the operation of and test a high pressure switch.

6. Describe the operation of and test a low pressure switch.

7. Test a blower or fan motor and its circuit.

8. Identify and differentiate between the various types of service valves.

9. Describe and wire the terminal connections of a thermostat temperature control.

10. Describe and install a liquid line drier.

11. Describe and install a suction line filter drier.

12. Describe the application and operation of the following types of compressors; (reciprocating, scroll, rotary, screw, centrifugal).

13. Describe and test thermistor type temperature sensors (PTC & NTC).

14. Describe the function and check the operation and of an oil pressure safety control.

15. Describe the operation of and test a solenoid valve.

16. Describe the operation of and test a hot gas bypass valve.

17. Describe the operation of and test a liquid line solenoid valve.

18. Describe a accumulator and its function.

19. Describe the operation of and adjust an inline, and pilot operated evaporator pressure regulator.

20. Describe a Head Master and its operation.

21. Describe a chilled water system and its operation.

22. Describe a capillary / distributor tube sizing and selection procedure.

23. Describe the operation of and install a fixed orifice metering device.

24. Describe the operation of and install a thermostatic expansion valve.

25. Describe the operation of and install a refrigerant receiver.

26. Describe a oil separator and its function.

27. Describe dry type evaporators and their operation.

28. Describe an air cooled condenser, its function, and operating parameters.

29. Describe and demonstrate the proper procedure for measuring and adjusting superheat.

30. Describe the operation and function of a flooded evaporator and its metering device.

31. Install and adjust a water regulating valve.

32. Install and adjust a low ambient temperature control.

33. Describe cooling towers and their operating limitations.

34. Describe the function and purpose of a multiple compressor system

35. Describe the automatic pumpdown system and its operation.

36. Describe the various fan controls, their application and operation.

37. Describe the purpose and check the operation of a crankcase heater.

38. State the proper charging procedures of blended refrigerants.

39. Define fractionation and temperature glide.

40. State the reason why capillary tube systems require a critical charge.

41. Size, design, and install refrigerant lines.

42. Define compression ratio.

43. Describe the various methods of compressor capacity control.

44. State the selection process for refrigerant oils.

45. Explain the procedures to retrofit a system from a CFC to an HFC, & an HCFC to an HFC.

46. Describe the required CFM for system operation and calculate air flow.

47. Define wet bulb depression.

48. Describe the design structure, function, operation, and selection of refrigerant distributors and feeder tubes.

49. Describe the function, selection and installation of a vibration eliminator.

50. Describe the piping configuration for a multiple evaporator systems.

51. Install a condensate drain.

52. Describe and install an economizer.

53. Describe the principles of dehumidification and humidification.


9 Commercial A/C

Academic Alignment


Academic Alignment


Academic Alignment

Language Arts


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