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Elements and Performance Criteria

1. Prepare to diagnose and rectify faults
   • WHS/OHS requirements and procedures are identified, obtained and implemented
2. WHS/OHS risk control measures and procedures are followed in preparation for work
3. Hazards are monitored and any not previously identified are documented and risk control measures implemented in consultation with relevant person/s
4. The extent of faults are determined from reports/documentation and discussions with relevant person/s
5. Relevant person/s is consulted to ensure work is coordinated with others on the worksite
6. Tools, equipment and testing devices required to diagnose faults are obtained and checked for correct operation and safety in accordance with workplace procedures
7. Diagnose and rectify faults
   • WHS/OHS risk control measures and workplace procedures for carrying out the work are followed
8. Need to test or measure live work is determined in accordance with workplace procedures and WHS/OHS requirements
9. Circuits/machines/plant are checked as being isolated, where necessary, in accordance with workplace procedures and WHS/OHS requirements
10. Logical diagnostic methods, measurements and estimations are applied to diagnose complex refrigeration/air conditioning system faults in accordance with system operational parameters and requirements
11. Suspected fault sources are tested to confirm if they are the source of system problems
12. Fault causes are identified and appropriately competent person/s engaged to rectify the fault where it is outside the scope of the refrigeration and air conditioning system
13. Faults in system components are rectified to return refrigeration/air conditioning system to its operational standard
14. System is tested to verify that the system operates as intended and to specified requirements and industry standards
15. Methods for resolving unexpected situations are discussed, as required, with appropriate person/s in accordance with job specifications and requirements
16. Methods for resolving unexpected situations are selected on the basis of safety and specified work outcomes
17. Diagnosis and rectification activities are conducted without waste of materials, damage to apparatus, the surrounding environment and/or services using sustainable energy practices
18. Complete and report fault diagnosis and rectification activities
    • WHS/OHS work completion risk control measures and procedures are followed
19. Worksite is made safe in accordance with workplace safety procedures
20. Fault diagnosis and rectification activities are documented in accordance with workplace procedures
21. Appropriate person/s is notified that system faults have been rectified in accordance with workplace procedures

Range Statement

Range is restricted to essential operating conditions and any other variables essential to the work environment. Non-essential conditions may be found in the UEE Electrotechnology Training Package Companion Volume Implementation Guide.
Diagnosing and rectifying faults must include at least four faults in the following complex refrigeration/air conditioning systems:	multiple major components (i.e. compressors, condenser or evaporators) circuits or systems and associated components and controls

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Performance Evidence

Evidence required to demonstrate competence in this unit must be relevant to and satisfy all of the requirements of the elements, performance criteria and range of conditions on at least one occasion and include:

applying logical diagnostic methods using fault scenarios to test the cause of system faults identifying faults and competency needed to rectify them rectifying faults in system controls verifying that the system operates correctly dealing with unplanned events applying relevant legislations, industry standards, codes of practice and regulations applying relevant work health and safety (WHS)/occupational health and safety (WHS/OHS) requirements, including: applying safe working practices hazard identification and reporting implementing risk control measures completing and reporting fault diagnosis and rectification activities determining need to test or measure live work isolating circuits/machines/plant using relevant tools, equipment and testing devices.

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Knowledge Evidence

Evidence required to demonstrate competence in this unit must be relevant to and satisfy all of the requirements of the elements, performance criteria and range of conditions and include knowledge of:

complex refrigeration and air conditioning system fault finding and repair, safe working practices and relevant standards, codes and regulations, including: fault-finding techniques including: factors to consider in clarifying the nature of a fault: initial fault report confirmation of symptoms of the fault comparison of symptoms with normal operation effect to cause reasoning — assumptions of possible causes methods for testing assumptions encompassing: visual inspection sectional testing split-half tests component isolation dealing with intermittent faults causes of intermittent faults are vibration, shock, changes in temperature and electromagnetic interference refrigeration system analysis, including: pressure enthalpy definitions: high pressure and low-pressure refrigerants triple point of new refrigerants glide of trinary blends differential evaporation of refrigerant blends variable refrigerant volume refrigeration cycle, including: expansion process vaporising process compression process condensing process compression ratio enthalpy processes, including: co-efficient of performance effect of suction temperature on cycle efficiency effect of condensing temperature on cycle efficiency actual refrigerating cycles, including: design operating conditions effects of superheating suction vapour superheating without useful cooling superheating that produces useful cooling superheating in suction piping outside the refrigerated space superheating the vapour inside the refrigerated space effects of subcooling the liquid effects liquid - suction heat exchangers effects of pressure losses resulting from friction refrigeration cycle faults, including: symptoms and causes measurements and fault confirmation tests air conditioning system analysis, including: psychrometric chart, including: properties, definitions and units plotting conditions: RA, SA, OA and MA psychometric processes, including: heating cooling only cooling and dehumidification cooling, dehumidification and reheat design operating conditions, including: indoor and outdoor wet and dry bulb temperatures volume flow rate supply, return and outdoor air air conditioning system faults, including: symptoms and causes measurements and fault confirmation tests power and control system analysis, including: power and control circuit diagrams sequence of operation manufacturers diagrams, specifications and instructions power and control circuit faults: symptoms and causes measurements and fault confirmation tests relevant measurements and estimations relevant risk mitigation processes relevant WHS/OHS legislated requirements, including: environmental and sustainable energy principles and practices safe working practices relevant workplace policies and procedures relevant workplace documentation.

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