DSL 733 - Air Conditioning

1. Explain basic air conditioning terms
   1. Explain heat and its movement
   2. Explain temperature and its units of measurement
   3. Define a British thermal unit
   4. Describe latent heat and how it is useful
   5. Explain sensible heat
   6. Define boiling
2. Explore air conditioning concepts
   1. Describe how temperature and pressure are related
   2. Explain what happens to heat during evaporation and condensation
   3. Describe how pressure affects the boiling and condensation point of refrigerant
   4. Relate superheat and sub-cooling to an a/c system
   5. Correlate air temperature and humidity to a/c
   6. Relate the importance of the non-compressibility of a liquid to an a/c system
3. Demonstrate over all operation of AC systems
   1. Show the components, in proper order, that are involved with TXV and CCOT systems
   2. Differentiate the high and low sides of an a/c system
   3. Differentiate where liquid and gas exists in an a/c system
   4. Identify major components on the vehicle
   5. Trace refrigerant flow, identifying its state, on the vehicle
   6. Explain the purpose and operation of different a/c compressors
   7. Describe the functions of a thermostatic expansion valve and orifice tube
   8. Explain the function of a condenser
   9. Explain the function of an evaporator
   10. Describe the purpose of a receiver/dryer and accumulator
   11. Tell what a suction throttling valve does for a system
4. Explain important safety issues involved with AC service
   1. List safety precautions to take when working with refrigerants
   2. Explain the hazards involved with refrigerants
   3. Explain important precautions to take when using a gauge set or recovery equipment
5. Examine environmental issues related to AC
   1. List the common refrigerants used in mobile a/c systems and how they affect the environment
   2. Tell what types of contaminates must be removed when recycling used refrigerant
   3. Explain EPA requirements for refrigerants including alternatives
   4. Describe some common changes that may have to be made for a conversion
6. Service an AC system
   1. Explain the operation of a gauge set and its valves
   2. Locate the vehicle’s service ports
   3. Describe the major operations performed when servicing a/c
   4. Demonstrate how to properly recover refrigerant
   5. Demonstrate how to properly evacuate a system
   6. Tell what types of oils are used and how they can be added to the system
   7. Explain how to charge on the high side and low side
   8. Tell several ways to determine the amount of charge
   9. Demonstrate how to make a complete charge using a recovery/recycle machine
   10. Demonstrate how to charge using a gauge set
   11. Replace common components
7. Evaluate the condition of an AC system
   1. Tell what can harm an a/c system
   2. Explain the purpose of an identifier
   3. Describe the procedure for stop-leak detection
   4. Describe several methods to detect refrigerant leaks
8. Examine the electrical subsystem
   1. Explain the operation and purpose of each electrical component including clutches
   2. Identify symbols for electrical components
   3. Explain the functions of binary and trinary switches
   4. Trace an electrical schematic and check a basic system
   5. Describe the basic principles of a computer-controlled system
9. Describe blend air operation
   1. List components in proper order of air flow
   2. Identify air door functions
   3. Tell several methods used to control air temperature
   4. Explain the reasons for re-circulating the air different applications
10. Diagnose the operation of the AC system
    1. Give examples of questions to ask the customer
    2. List various observations to make
    3. Explain normal gauge readings to have under different conditions
    4. Relate abnormal gauge readings to possible causes
    5. Relate other abnormal observations to possible causes