STANDARD COMPETENCIES

 

 1. Identify system type and components (cycling clutch orifice tube – CCOT, expansion valve) and conduct performance test(s) on HVAC systems; determine needed action.

 2. Identify causes of temperature control problems in the A/C system; determine needed action.

 3. Identify refrigerant and lubricant types; and contamination in the A/C system components; determine needed action.

 4. Identify A/C system problems indicated by pressure gauge and temperature readings; determine needed action.

 5. Identify A/C system problems indicated by visual, audible, smell, touch procedures, and perform leak test; determine needed action.

 6. Recover, evacuate, and recharge A/C system using appropriate equipment.

 7. Interface with vehicle’s on-board computer; retrieve DTC’s, perform diagnostic procedures using recommended electronic service tool(s)

    (including PC based software and/or data scan tools); determine needed action.

 8. Identify A/C system problems that cause protection devices (pressure, thermal, and electronic) to interrupt system operation; determine needed action.

 9. Inspect, test, and replace A/C system pressure, thermal, and electronic protection devices

 10. Inspect and replace A/C compressor drive belts, pulleys, and tensioners; adjust belt tension and check alignment.

 11. Inspect, test, adjust, service, and replace A/C compressor, A/C compressor clutch components or assembly, and compressor mountings and hardware.

 12. Correct system lubricant level when replacing the compressor, evaporator, condenser, receiver/drier or accumulator/drier, and hoses.

 13. Inspect A/C system hoses, lines, filters, fittings, seals, and system service ports; determine needed action.

 14. Inspect and test A/C system condenser and cab/sleeper evaporator core, check for proper airflow and mountings, determine needed action.

 15. Inspect and replace receiver/drier or accumulator/drier, and orifice tube.

 16. Inspect and test cab/sleeper refrigerant solenoid, expansion valve(s); check placement of thermal bulb (capillary tube); determine needed action.

 17. Inspect, clean, or repair evaporator housing and water drain; inspect and service/replace evaporator air filter.

 18. Identify the cause of system failures resulting in refrigerant loss from the A/C system high pressure relief device; determine needed action.

 19. Inspect and test A/C compressor clutch relays, modules, electrical/electronic control panel assemblies, wiring, sensors, switches, diodes,

     and protection devices; determine needed action.

 20. Inspect and test A/C related electronic engine control systems; determine needed action.

 21. Maintain and verify correct operation of certified equipment.

 22. Identify and recover A/C system refrigerant.

 23. Recycle or properly dispose of refrigerant.

 24. Handle, label, test recycled refrigerant for non-condensable gases and store refrigerant.

 

 

 TOPICAL OUTLINE

 

 I. General A/C System Operation, Diagnosis, and Repair

  A. Air conditioning fundamentals and basic operation

  B. Performance testing and diagnosis

  C. Refrigerant and refrigerant oil types

  D. HVAC computer diagnosis and scan tool usage

 II. Heavy Duty Refrigeration System Components and Operation

  A. Compressor and clutch

  B. Air conditioning lines, filters, mufflers, hoses, fittings and seals

  C. Receiver/drier or accumulator/drier

  D. Expansion/orifice valves

  E. Pressure protection

  F. Evaporator

  G. Protection devices

 III. Heating, Ventilation, and Engine Cooling Systems

  A. Operating systems and controls

  D. AC control head

  E. Cables, motors and linkages

  F. Automatic or semi-automatic control systems

 IV. Refrigerant Recovery, Recycling, and Handling

  A. Equipment

  B. Identify and recover A/C refrigerant

  C. Recycle, label and storage

  D. Evacuate and charge

  E. Add refrigerant oil