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Elements and Performance Criteria

1. Identify and confirm the work requirement
   • Nature and objective of diagnostic requirements are determined from workplace instructions
   • Existence of fault in air conditioning and HVAC system is confirmed from direct or indirect evidence
   • Hazards associated with the work are identified and risks are managed according to workplace procedures and safety and environmental requirements
2. Prepare to carry out diagnosis
   • Manufacturer specifications and other technical information for air conditioning and HVAC system are accessed and interpreted
   • Diagnostic procedures and options are identified
   • Diagnostic method sequence, tests and testing processes are selected from the range of available options
   • Testing equipment is selected and prepared according to manufacturer specifications and workplace procedures
   • Tools, equipment and materials required to support the diagnostic process are identified, selected and prepared for use
3. Apply diagnostic procedures
   • Selected diagnostic process is followed and testing is carried out according to manufacturer specifications, workplace procedures and safety requirements
   • Diagnostic findings are verified, as required, by using reliable alternative or optional process according to manufacturer specifications and workplace procedures
   • Conclusions are drawn from findings and documented according to workplace procedures, including recommendations for necessary repairs
   • Conclusions are provided to appropriate personnel or customer to confirm further action to be taken
4. Complete work processes
   • Vehicle, vessel or machinery is presented ready to be repaired or returned to the customer
   • Work area is cleaned, waste and non-recyclable materials are disposed of, and recyclable material is collected
   • Tools and equipment are checked and stored, and any faulty electrical equipment is identified, tagged and isolated according to workplace procedures
   • Workplace documentation is processed according to workplace procedures
5. Identify and confirm the work requirement
   • Nature and objective of diagnostic requirements are determined from workplace instructions
   • Existence of fault in air conditioning and HVAC system is confirmed from direct or indirect evidence
   • Hazards associated with the work are identified and risks are managed according to workplace procedures and safety and environmental requirements
6. Prepare to carry out diagnosis
   • Manufacturer specifications and other technical information for air conditioning and HVAC system are accessed and interpreted
   • Diagnostic procedures and options are identified
   • Diagnostic method sequence, tests and testing processes are selected from the range of available options
   • Testing equipment is selected and prepared according to manufacturer specifications and workplace procedures
   • Tools, equipment and materials required to support the diagnostic process are identified, selected and prepared for use
7. Apply diagnostic procedures
   • Selected diagnostic process is followed and testing is carried out according to manufacturer specifications, workplace procedures and safety requirements
   • Diagnostic findings are verified, as required, by using reliable alternative or optional process according to manufacturer specifications and workplace procedures
   • Conclusions are drawn from findings and documented according to workplace procedures, including recommendations for necessary repairs
   • Conclusions are provided to appropriate personnel or customer to confirm further action to be taken
8. Complete work processes
   • Vehicle, vessel or machinery is presented ready to be repaired or returned to the customer
   • Work area is cleaned, waste and non-recyclable materials are disposed of, and recyclable material is collected
   • Tools and equipment are checked and stored, and any faulty electrical equipment is identified, tagged and isolated according to workplace procedures
   • Workplace documentation is processed according to workplace procedures

Range Statement

This section specifies work environments and conditions that may affect performance. Essential operating conditions that may be present (depending on the work situation, needs of the candidate, accessibility of the item, and local industry and regional contexts) are included. Bold italicised wording, if used in the performance criteria, is detailed below.

Safety and environmental requirements must include:

work health and safety (WHS) and occupational health and safety (OHS) requirements, including procedures for: identifying hazards and controlling risks associated with wearing jewellery while working around high electrical currents working with refrigerants at boiling point given risk of frostbite working with system lubricants, including carcinogenic oils handling flammable refrigerants preventing loss of refrigerant to environment using personal protective equipment identifying fire safety equipment (PPE) environmental requirements, including procedures for preventing loss of refrigerant to the atmosphere.

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Performance Evidence

Before competency can be determined, individuals must demonstrate they can perform the following according to the standard defined in this unit’s elements, performance criteria, range of conditions and foundation skills:

diagnose a complex fault in the air conditioning and heating, ventilation and air conditioning (HVAC) systems of two different vehicles, vessels or machinery

the above diagnosis must involve two of the following types of complex faults:

an intermittent fault

a fault that affects more than one system

a fault introduced as a result of a system repair

an indirect fault caused by the influence of external systems.

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Knowledge Evidence

Individuals must be able to demonstrate knowledge of:

work health and safety (WHS) and occupational health and safety (OHS) requirements relating to diagnosing complex faults in air conditioning and HVAC systems, including procedures for:

identifying hazards and controlling risks associated with wearing jewellery while working around high electrical currents

working with refrigerants at boiling point given risk of frostbite

working with system lubricants, including carcinogenic oils

handling flammable refrigerants

preventing loss of refrigerant to environment

using personal protective equipment (PPE)

identifying and using fire safety equipment

environmental requirements, including procedures for preventing loss of refrigerant to the atmosphere

types of complex faults relating to air conditioning and HVAC systems, including:

intermittent

multi-system

introduced as a result of system repair

indirect, caused by the influence of external systems

requirements of Australian automotive code of practice: Control of refrigerant gases during manufacture, installation, servicing or de-commissioning of motor vehicle air conditioners, including procedures for preventing loss of refrigerant to atmosphere

methods for locating and content of manufacturer specifications, workplace procedures and other technical information relating to air conditioning and HVAC systems

types, function and operation of air conditioning and HVAC systems, including:

climate control systems

single and dual zone systems

electric controlled compressor systems

testing procedures for air conditioning and HVAC systems, including:

vehicle HVAC performance testing

component failure analysis

vehicle continuous and non-continuous monitored systems

procedures for using testing and diagnostic tools and equipment, including:

scan tools

oscilloscopes

manifold and gauge sets

vacuum pumps

leak detectors

nitrogen cylinder and regulators

digital vacuum gauges (vacrometer)

digital multimeters

infra-red thermometers (pyrometer)

types, functions, operation and limitations of diagnostic testing equipment required to diagnose complex faults in vehicle air conditioning and HVAC systems

procedures for accessing and interpreting scan tool system data, including:

diagnostic trouble codes (DTCs), including:

conditions that set the DTCs

conditions for running DTCs

live data

freeze frame data

waveforms

methods and processes for documenting and reporting diagnostic findings and recommendations.

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