Assessment Requirements for AURETU004 Diagnose and repair air conditioning and HVAC systems

Release: 1

Assessment Requirements for AURETU004 Diagnose and repair air conditioning and HVAC systems

Modification History

Release	Comment
Release 1	New unit of competency.

Performance Evidence

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

diagnose and repair a fault in the air conditioning and heating, ventilation and cooling (HVAC) systems of two different vehicles or machinery, in which the work must involve removing, refitting or replacing two of the following:

condenser

evaporator

expansion valve

compressor

heater box.

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 and repairing air conditioning and HVAC systems, including procedures for:

working with refrigerants at boiling point given risk of frostbite

working with system lubricants, including carcinogenic oils

handling flammable refrigerants

using personal protective equipment (PPE)

identifying and using fire safety equipment

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

key requirements relevant to diagnosing and repairing air conditioning and HVAC systems detailed in the Australian automotive code of practice: Control of refrigerant gases during manufacture, installation, servicing or de-commissioning of motor vehicle air conditioners

air conditioning and HVAC system principles, including:

heat transfer principles, including convection, conduction and radiation

functions of the following air conditioning components:

compressor

condenser

receiver-drier

evaporator

blower fan

refrigerant

functions of the following heating components:

radiator

thermostat

radiator and heater hoses

heater tap

heater box

single zone and multi-zone vehicle layouts

application, purpose and operation of air conditioning and HVAC systems and components, including:

high pressure and low pressure sides of air conditioning systems

compressors, including:

axial type, including variable capacity compressors

scroll type

vane type

electromagnetic clutches

condensers

receiver-dryer, including filters and desiccants

expansion valves, including capillary tube

evaporator

thermostat

refrigerants, including R12, R134, R1234yf and hydrocarbon refrigerants

compressor oils

air conditioner and heating controls, including levers and ducting

air conditioner and heating electrical circuits and sensors, including:

high and low pressure switches

pressure relief valves

temperature sensors

climate control systems

diagnostic testing procedures for air conditioning and HVAC systems, including:

using diagnostic flow charts

using manifold gauges on systems with different refrigerants, including analysis of high and low pressure readings in conjunction with temperature probes

testing electrical systems, including procedures for:

accessing electrical terminals and using test probes without damaging connectors, fuse holders or wiring

resistance and voltage drop tests

open and short circuit tests

checking shorts to signal, power circuits and grounds

repair procedures for air conditioning and HVAC systems, including procedures for:

using manifold gauges to discharge, evacuate and charge system refrigerants

removing and replacing system components

post-repair testing procedures for air conditioning and HVAC systems, including procedures for checking for:

refrigerant leaks

heater core and system water coolant leaks

static and dynamic performance tests of air conditioning and HVAC systems, including checking:

ambient temperature

vent temperature

condenser and suction line temperature.

Assessment Conditions

Assessors must satisfy NVR/AQTF assessor requirements and hold an Australian Refrigerant Council (ARC) Refrigerant Handling licence.

Competency is to be assessed in the workplace or a simulated environment that accurately reflects performance in a real workplace setting.

Assessment must include direct observation of tasks.

Where assessment of competency includes third-party evidence, individuals must provide evidence that links them to the air conditioning and HVAC systems that they have worked on, e.g. repair orders.

Assessors must verify performance evidence through questioning on skills and knowledge to ensure correct interpretation and application.

The following resources must be made available:

automotive repair workplace or simulated workplace

workplace instructions

manufacturer specifications for air conditioning and HVAC systems

Australian automotive code of practice: Control of refrigerant gases during manufacture, installation, servicing or de-commissioning of motor vehicle air conditioners

ARCtick service decal stickers

procedures for servicing and adjusting vehicle air conditioning and HVAC systems

two different vehicles or machinery with air conditioning and HVAC system faults

diagnosis and repair equipment for air conditioning and HVAC systems, including:

manifold and gauge set

recovery unit

vacuum pump

electronic leak detector

nitrogen cylinder and regulator

multimeter

electronic scales

oil injector

infra-red thermometer

temperature probe

scan tool.

Links

Companion Volume implementation guides are found in VETNet - https://vetnet.gov.au/Pages/TrainingDocs.aspx?q=b4278d82-d487-4070-a8c4-78045ec695b1

Companion Volume implementation guides are found in VETNet - https://vetnet.gov.au/Pages/TrainingDocs.aspx?q=b4278d82-d487-4070-a8c4-78045ec695b1