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Elements and Performance Criteria

1. Prepare to diagnose and rectify faults
   • WHS/OHS requirements and workplace procedures are identified, obtained and applied
2. WHS/OHS risk control measures and procedures are followed
3. Hazards not previously identified are documented and risk control measures devised and implemented in consultation with relevant person/s
4. Extent of faults are determined from reports/documentation and/or discussions with relevant person/s
5. Relevant person/s is consulted to ensure work is coordinated effectively with others involved 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 and measure live work is determined in accordance with workplace procedures and WHS/OHS requirements
9. Circuits/machines/plant are checked and isolated in accordance with workplace procedures and WHS/OHS requirements
10. Logical diagnostic methods, measurements and estimations are applied to diagnose control system faults in accordance with system operating parameters and operational requirements
11. Suspected fault sources are tested to confirm 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 control system
13. Faults in system components are rectified to return the refrigeration or HVAC system to its operational standard
14. System is tested to verify that the system operates as intended and to specified requirements and operational standards
15. Methods for resolving unplanned events are discussed with appropriate person/s in accordance with job specifications and requirements
16. Methods for resolving unplanned 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 workplace 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 in complex HVAC and refrigeration control systems must include at least the following:	four faults in complex refrigeration or HVAC control systems

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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 documenting fault rectification dealing with unplanned events applying relevant legislation, 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 determining need to test or measure live work diagnosing faults in complex refrigeration or heating, ventilation and air conditioning (HVAC) control systems 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 HVAC/refrigeration control systems, fault finding, safe working practices and relevant standards, codes and regulations, including: control fundamentals, including: control terminology refrigeration system characteristics HVAC system characteristics control system characteristics control system components control system diagrams and symbols product knowledge types of control equipment, including: electrical: classification of circuits two position control floating control sensors controllers flow control devices control systems diagrams electronic: operating principles sensors controllers control system diagrams digital control systems, including: computer-based control fundamentals: definitions principles controller configuration: equipment zone level controllers system level controllers controller software: operating software application software controller programming: system diagrams control diagrams configuration programming initialisation EMS and BMS supervisory control and data acquisition (SCADA) system lan and Bacnet control systems applications, including: refrigeration air conditioning: air handling system controls ventilation heating building airflow system control airflow control singles and multi-zones chiller/boiler and distribution system control (chilled water, boiler and distribution systems) diagnostic methods, measurements and estimations faults within scope of work relevant manufacturer specifications relevant WHS/OHS legislated requirements, including: risk control measures relevant workplace documentation relevant workplace policies and procedures.

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