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Elements and Performance Criteria

1. Prepare to recover refrigerant, pressure and leak test, evacuate and charge split systems
   • WHS/OHS hazards, risk control methods, relevant standards, codes and legislation are obtained and applied in accordance with workplace procedures
2. Safety hazards not previously identified are assessed, reported and advice on risk control measures sought from supervisor
3. Nature of the work is obtained from documentation or supervisor to determine the scope of work to be undertaken
4. Work activity is appropriately sequenced in accordance with job schedule
5. Relevant person/s is consulted to ensure work is coordinated effectively with others involved on the worksite
6. Refrigerant, lubricants and cleaning materials for work are obtained in accordance with workplace procedures and checked against job/task requirements
7. Tools, equipment and testing devices needed to carry out the work are obtained and checked for correct operation and safety
8. Preparatory work is inspected and checked to ensure no damage has occurred and complies with workplace procedures and job/task requirements
9. Recover refrigerant, pressure and leak test evacuate and charge split systems
   • Checks are carried out to ensure the system and/or component parts are isolated in accordance with workplace procedures
10. Machines, plant and circuits are isolated in accordance with workplace procedures
11. Refrigerants are safely removed from split system and placed into labelled containers in accordance with regulatory requirements, industry standards and codes of practice, and any electrical work is referred to a licensed electrician in accordance with workplace procedures.
12. Precautions are taken to prevent damage to components while pressure testing the system
13. Pressure testing is conducted using dry nitrogen at a pressure relative to the refrigerant to be used
14. Leaks are located and rectified using testing methods appropriate to system under test in accordance with industry standards
15. Split system is evacuated to required level and system is cleaned of all moisture and other containments in accordance with industry standards and codes of practice
16. A drop test is performed to test evacuation using an electronic vacuum gauge in accordance with industry standards and codes of practice
17. Component lubricants are checked and maintained in accordance with manufacturer specifications
18. Split systems are charged with refrigerant in accordance with manufacturer specifications, industry standards and codes of practice
19. Problematic situations are resolved in accordance with workplace procedures and reported to supervisor
20. Split systems are pressure and leak tested, evacuated and charged without waste of materials or damage to apparatus, the surrounding environment or services in accordance with relevant workplace sustainable energy practices
21. Report on refrigerant recovery, pressure and leak test, evacuation and charge work
    • Worksite is cleaned and made safe in accordance with workplace procedures
22. Contaminated refrigerant is dealt with in accordance with workplace procedures and legislative/regulatory requirements
23. Completion of work is documented and appropriate person/supervisor notified 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.

testing and charging split air conditioning systems must include at least the following:

determining, using measurement and basic calculations methods, the operating conditions of vapour compression split system, including suction and discharge pressures ambient, evaporator and condensing temperatures evaporator and condenser temperature differences recovering Class A1 and A2L refrigerant from an existing split system, including split single head air conditioning and/or hot water heat pump systems pressure and leak testing a newly installed system evacuating newly installed systems in preparation for charging with refrigerant charging newly installed systems with Class A1 and A2L refrigerant

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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 (OHS) requirements, including: identifying hazards risk control measures using personal protective equipment (PPE) applying safe working practices and relevant legislation, industry standards, codes of practice and regulations completing required documentation, including reporting refrigerant recovery, pressure and leak tests, evacuations, charging refrigerant work and system operating conditions determining basic operating conditions, including: ambient, evaporation and condensing temperatures evaporator and condenser temperature differences suction and discharge pressures recovering, pressure testing, evacuating, charging and leak testing refrigerant in newly installed split systems to requirements using appropriate equipment, tools and measurement devices starting up system and performing function checks selecting, obtaining and checking relevant equipment, materials, tools and testing devices required to carry out the work, including: A1, A2 and A2L class refrigerants, lubricants and charging equipment oxygen-free dry nitrogen cylinder and regulator pressure and temperature measurement devices pressure testing and refrigerant leak testing equipment and tools refrigeration evacuation equipment and measuring equipment suitable for A1, A2 and A2L class refrigerants refrigerant recovery/reclaim equipment suitable for A1, A2 and A2L class refrigerants refrigeration hand and power tools refrigeration service tools single head split air conditioning systems using lubricants and cleaning materials safely in accordance with safety data sheets (SDS)/material safety data sheets (MSDS).

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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:

equipment and procedures for working with refrigerants, including: charging refrigerant into a newly installed split system detecting refrigerant leaks (electronic, bubbles and halide for R22) contaminant detection and removal evacuating newly installed split systems pressure testing systems newly installed split systems using dry nitrogen reclaiming/recovering refrigerants using recovery units and recovery cylinders heat and heat transfer leak detectors types, applications, operation and procedures manifold gauges types, applications, operation and procedures pressure temperature relationships and charts pressure, units and measurement refrigerant conditions, including saturation, superheat and sub-cooling relative humidity, unit and measurement relevant industry standards, codes of practice and regulations, including WHS/OHS legislated requirements relevant manufacturer specifications relevant risk mitigation processes, including risk control measures safe working practices, safe handling and SDS/MSDS sensible and latent heat split heat pump Class A1, A2 and A2L refrigerant types, properties and applications split heat pump refrigerant oil types, properties and applications sustainable energy principles and practices, including: environment protection requirements sustainable energy practices sustainable resources system access fittings types, applications, operation and procedures temperature, units and measurement vapour compression cycle, basic operation and major system components.

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