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Elements and Performance Criteria

1. Prepare to install ammonia refrigeration system
   • 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 sought from the project engineer
3. Nature of work is obtained from documentation or from project engineer to determine the scope of work to be undertaken
4. Advice is sought from the project engineer to ensure refrigeration work is coordinated effectively with others
5. Sources of materials required for work are determined 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 and commission ammonia refrigeration system
   • Measuring system operating parameters are conducted in accordance with WHS/OHS requirements and workplace procedures
8. Major components and pipe work are installed in accordance with relevant industry standards, codes of practice and regulations
9. Pressure testing is conducted at a pressure compatible with ammonia and in accordance with industry standards and practices
10. Precautions are taken to prevent damage to components while pressure testing the system
11. Leaks are located and rectified using testing methods appropriate to the refrigeration system and in accordance with industry standards and practices
12. Refrigeration system is evacuated in accordance with industry standards and practices
13. Refrigeration system is charged safely with ammonia and lubricants in accordance with industry standards and practices
14. Refrigeration pre-operational checks are carried out on operating and safety controls in accordance with manufacturer specifications
15. Refrigeration system is commissioned and adjustments made to operating and safety controls
16. Temperature reduction of cool rooms and freezers are undertaken in accordance with industry standards and practices
17. Refrigeration maintenance is carried out and includes inspection and cleaning of strainers and filters and collection of oil sample for analysis
18. Training is conducted for person/s responsible for the refrigeration system operation and maintenance
19. Complete and report on commissioning of ammonia refrigeration system
    • Worksite is cleaned and made safe in accordance with workplace procedures
20. Contaminated refrigerant and lubricant are dealt with in accordance with legislative/regulatory requirements
21. Refrigeration operation condition and commissioning data are documented and includes parameters not within the specified range for the system
22. Refrigeration mechanical and electrical commissioning documentation is completed 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.
Installing and commissioning ammonia refrigeration system must include at least the following:	determining: suction and discharge pressures ambient, evaporator and condensing temperatures evaporator and condenser temperature difference critical point of ammonia (R717)
Charging and discharging must include the following:	ammonia (R717) system with refrigerant and lubricant in a safe and environmentally responsible manner

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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 legislative, industry standards and practices 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 conducting refrigeration system operation and maintenance 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 identifying the conditions of the ammonia (R717) refrigerant at various locations in the vapour compression and 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 pressure testing, charging/discharging refrigerant/lubricants and determining the operating conditions of ammonia vapour compression and liquid recirculation refrigeration system recording measurements removing system contaminants and evacuating selecting and using appropriate measuring devices correctly using calculation methods accurately using methodical and efficient commissioning techniques in accordance with workplace procedures.

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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:

cool room and freezer construction, including: commissioning procedures construction materials construction methods defrost methods underfloor heating installation and commissioning techniques for ammonia refrigeration systems insulation and vapour barrier, including insulation materials and vapour barriers refrigeration control system testing and adjustment, including: central programmable logic controller (PLC) system defrost methods and controls flow controls refrigerant level controls refrigerant pressure controls temperature controls refrigerant piping, including: hydraulic shock installation principles material compatibility pipe sizing principles pressure testing/evacuation relief valves welding relevant job safety assessments or risk mitigation processes relevant legislative, industry standards and practices relevant manufacturer specifications relevant WHS/OHS legislated requirements relevant workplace documentation, including reports on installation and commissioning of ammonia refrigeration systems relevant workplace policies and procedures, including workplace emergency response plan testing and commissioning ammonia refrigeration systems, including: air cooled condensers compressors direct contact freezing evaporative condensers evaporators (air/fluid cooling) high pressure receivers secondary refrigerants start-up and shutdown procedures water cooled condensers.

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