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Elements and Performance Criteria

1. Prepare to service ammonia refrigeration system
   • WHS/OHS hazards, risk control methods, relevant standards, codes and legislation are obtained and applied
2. Safety hazards which have not been previously identified are reported, risk assessed and advice on risk control measures 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. Advice is sought from work supervisor to ensure the work is coordinated effectively with others
5. Sources of materials required for the refrigeration work are accessed in accordance with workplace and procedures
6. Tools, equipment and testing devices needed to carry out refrigeration work are obtained and checked for correct operation and safety
7. Service and repair ammonia refrigeration system
   • Measuring system operating parameters are conducted in accordance with WHS/OHS requirements and workplace safety procedures
8. Refrigeration inspection and checks are carried out to ensure the system or component parts are isolated in accordance with WHS/OHS requirements and workplace procedures
9. Refrigerant is removed from system safely in accordance with regulatory requirements, industry standards and practices
10. Precautions are taken to prevent damage to components while pressure testing the refrigeration system
11. Pressure testing is conducted at a pressure compatible with ammonia and in accordance with industry standards
12. Refrigeration leaks are located and rectified using testing methods appropriate to the system and in accordance with industry standards and practices
13. Oil is removed from an operational ammonia refrigeration system in accordance with industry standards and practices
14. Refrigeration system is charged safely with ammonia and compatible lubricants in accordance with industry standards and practices
15. Actual and specified range of operating conditions are determined from measured and calculated values as they apply to ammonia vapour compression and liquid recirculation systems in accordance with workplace procedures and industry standards
16. Unplanned situations are dealt with safely in accordance with workplace procedures and with approval of an authorised person/s in a manner that minimises risk to personnel and equipment
17. Operating conditions are determined without damage to apparatus, circuits, the surrounding environment or services using sustainable energy practices
18. Complete and report servicing and repairing ammonia refrigeration system
    • Worksite is cleaned and made safe in accordance with workplace procedures
19. Contaminated refrigerant and lubricant are dealt with in accordance with legislative/regulatory requirements and industry standards
20. Operation conditions are documented and include identification of any parameter that is not within the specified range for the system
21. Work supervisor is notified of the completion of the work 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.

Servicing and repairing ammonia refrigeration systems must include at least the following:

one ammonia refrigerant refrigeration system, including the following: determining operating conditions using measurement and basic calculation methods: suction and discharge pressures ambient evaporator and condensing temperatures evaporator and condenser temperature differences discharging/recovering refrigerant, replacing components, testing pressure, evacuating, charging and leak testing an ammonia refrigerant system 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 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 dealing with unplanned events/situations in accordance with workplace procedures in a manner that minimises risk to personnel and equipment decontaminating and evacuating the system 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 locating and rectifying leaks recording measurements selecting and using appropriate measuring devices correctly servicing, pressure testing, charging/discharging refrigerant/lubricants and determining the operating conditions of ammonia vapour compression and liquid recirculation refrigeration system using calculation methods accurately.

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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:

ammonia refrigeration systems and operating conditions, including: cascade systems direct expansion systems flooded systems liquid recirculation systems multi-staged systems revision of vapour compression cycle single staged systems types of ammonia systems vapour compression systems properties of ammonia safe handling of ammonia ammonia refrigeration system's major components, flow controls and ancillary components relevant job safety assessments or risk mitigation processes hazards associated with ammonia refrigeration systems relevant manufacturer specifications relevant WHS/OHS legislated requirements relevant workplace documentation, including service manuals and service documentation relevant workplace policies and procedures, including workplace emergency response plan servicing and repairing techniques for ammonia refrigeration systems, including: adding refrigerant leak detection methods removing refrigerant. servicing procedures.

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