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Elements and Performance Criteria

1. Prepare to install CO² refrigeration components and associated equipment
   • WHS/OHS hazards, risk control methods, relevant standards, codes and legislation are obtained and applied
2. Safety hazards not previously identified are reported, assessed and advice on risk control measures is sought from work supervisor
3. Nature of work is obtained from documentation or from work supervisor to determine the scope of work to be undertaken
4. Refrigeration component and equipment installation is appropriately sequenced in accordance with job schedule
5. Sources of materials required for refrigeration work are obtained in accordance with workplace procedures
6. Tools, equipment and testing devices needed to carry out refrigeration work are obtained and checked for correct operation and safety
7. Install CO² refrigeration system
   • Circuits/machines/plant are checked and isolated in accordance with WHS/OHS requirements and workplace procedures
8. Refrigeration components and equipment are installed in accordance with technical industry standards, job specifications and requirements with sufficient access to affect electrical and pipe work connections and maintenance
9. Refrigeration components and equipment are installed straight and square, in the required locations and within acceptable tolerances
10. Pressure testing is conducted at a pressure compatible with CO² and in accordance with industry standards
11. Leaks are located and rectified using testing methods appropriate to the system and in accordance with industry standards and practices
12. Refrigeration system is evacuated to the required level and cleaned of moisture and contaminants in accordance with industry standards and practices
13. Unplanned situations are responded to in accordance with workplace procedures, discussed with appropriate person/s and documented in a manner that minimises risk to personnel and equipment
14. Installation and tests are carried out without damage to apparatus, circuits, the surrounding environment or services and using sustainable energy practices
15. Commission CO² refrigeration system
    • Commissioning work is appropriately sequenced in accordance with job specification
16. Appropriate person/s is consulted to ensure the work is coordinated effectively with others involved on the worksite
17. Extent of the system and location of system components is determined from site inspection and/ or job specifications and diagrams
18. System control settings and operating parameters are determined from job specifications and requirements
19. Tools, equipment and testing devices needed to commission a CO² refrigerant system are obtained and checked for correct operation and safety
20. Refrigeration system is charged safely with refrigerant grade CO² and compatible lubricants in accordance with industry standards and practices
21. Refrigeration actual and specified range of operating conditions are determined from measured and calculated values as they apply to CO² vapour compression and volatile secondary (liquid recirculation/cascade) system in accordance with workplace procedures
22. Pre-commissioning checks are undertaken to ensure components are in place and secure in accordance with manufacturer specifications and industry standards
23. Need to test or measure live operating CO² system is determined in accordance with WHS/OHS requirements and workplace safety procedures
24. CO² refrigeration system pressure controls, valves, pumps and regulators are adjusted to their required settings
25. Testing/measuring devices are used to observe the operation of refrigeration system and fine adjustments of controls are made as required in accordance with manufacturer specifications
26. Commissioning is conducted efficiently, without waste of materials or damage to apparatus, the surrounding environment or services and using sustainable energy practices
27. Complete work and relevant documentation
    • Worksite is cleaned and made safe in accordance with workplace procedures
28. Final check of the installed components and equipment is made to verify that it complies with relevant industry standards and job requirements
29. 'As-installed' refrigeration components and equipment are documented and appropriate person/s notified in accordance with workplace established procedures
30. Commissioning results are documented and include final operating parameters of the refrigeration system

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.
Installing, connecting and commissioning CO² refrigeration system, components and associated equipment must include at least the following:	major components: compressors cascade condensers evaporators liquid recirculation pump/s associated equipment: refrigerant piping refrigerant flow controls cycling controls safety controls relief valves isolation valves monitoring and inspection accessories Note: Steel pipe welding competency is not covered by this unit.

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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 two separate occasions and include:

applying relevant work health and safety (WHS)/occupational health and safety (WHS/OHS) requirements and workplace procedures and practices, including using risk control measures applying sustainable energy principles and practices installing carbon dioxide (CO²) refrigeration system components, pipe work and associated equipment dealing with unplanned events/situations in accordance with workplace procedures in a manner that minimises risk to personnel and equipment discharging/charging refrigerant/lubricants and pressure testing the system without damage to components documenting operating conditions correctly (commissioning) identifying the conditions of the CO² refrigerant at various locations in the vapour compression and volatile secondary (liquid recirculation) system installing, connecting, securing and aligning components and equipment and ensuring that equipment and pipe work is compliant with relevant industry standards, codes of practice and regulations locating and rectifying leaks optimising system performance and efficiency pressure testing entire system at the appropriate design test pressures using dry nitrogen reading and interpreting drawings to pipe work layouts and apparatus locations recording measurements removing system contaminants and evacuating selecting and using appropriate measuring devices correctly using calculation methods accurately using methodical and efficient commissioning techniques.

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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:

installation and commissioning procedures for CO² refrigeration systems, including: materials and installation procedures: material selection copper pipe standards steel pipe standards pipe connections pipe supports hangers and connections arrangement of isolation valves location of relief valves commissioning: pressure testing evacuation and dehydration charging refrigerant and lubricant system testing and adjustment documentation operating conditions of CO² vapour compression and volatile secondary (liquid recirculation/cascade) system/s relevant industry standards and practices relevant manufacturer specifications relevant job safety assessments or risk mitigation processes relevant WHS/OHS legislated requirements relevant workplace documentation relevant workplace policies and procedures.

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