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Elements and Performance Criteria

1. Identify commercial refrigeration system equipment and components
   • Extent and nature of refrigeration installation is determined from job specifications
2. Refrigeration system safety and regulatory compliance requirements are identified and applied
3. Develop refrigeration pipe work arrangements
   • Location of refrigeration equipment is determined from regulatory requirements, job specifications and site drawings
4. Refrigeration piping is arranged to ensure safe and functional operation of the system
5. Pipe work is arranged to comply with technical industry standards, job specifications and requirements
6. Select commercial refrigeration system equipment and components
   • Pipe and tubing are selected for suitability for the commercial environments it is to be installed
7. Pipe and tubing are sized to meet refrigeration parameters and capacity requirements for the refrigerant to be used
8. Pipe and tubing quantities are determined from equipment location diagrams and job specifications
9. Refrigeration system equipment and components are selected to meet load requirements based on calculated or deemed-to-comply solutions
10. Refrigerant liquid expansion valves are selected to meet functional, specified and regulatory requirements
11. Automatic control devices are selected to meet functional, specified regulatory requirements, current voltage and ingress protection (IP) ratings
12. Evidence is obtained that the selected refrigeration equipment and components comply with job requirements and industry standards
13. Document selection of system equipment and components
    • Reasons for selections made including calculations are documented in accordance with workplace procedures
14. Refrigeration installation arrangements and specifications for selected items are documented in accordance with workplace procedures and forwarded to appropriate person/s

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.
Selecting commercial refrigeration system equipment and components, pipe work and controls must include at least the following:	two different refrigeration systems, including: refrigerant condensing unit evaporator refrigerant controls accessories refrigerant and condensate pipe work system controls

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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:

arranging pipe work to comply with regulatory and functional requirements selecting appropriate type, size and quantity of pipe and tubing selecting refrigeration equipment and components that meets load requirements selecting automatic control devices that meet functional and regulatory requirements documenting pipe work arrangement, specification for items selected and reasons for the selections made dealing with unplanned events applying relevant work health and safety (WHS)/occupational health and safety (OHS) requirements and workplace procedures and practices, including using risk control measures applying sustainable energy principles and practices.

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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:

basic commercial refrigeration system equipment, components, accessories selection, piping selection, safe working practices and relevant standards, codes and regulations, including: calculation of capacity in heat exchangers: Q = UA (LMTD) Q = mc∆t Q = m ∆h evaporators: commercial types and applications coil bypass factor effects of evaporator TD on space humidity effects of air circulation on product conditions selection criteria and selection tables condensers: commercial types and applications effects of ambient conditions condenser control heat rejection factor condenser TD selection criteria and selection tables compressors: types and applications capacity displacement volume flow rate theoretical capacity total volumetric efficiency effect of operating conditions, including suction pressure drop and superheating actual capacity power theoretical requirement effects of operating conditions actual requirements post defrost loads pull down torque requirements, high, medium and low back pressure compressors selection tables, motor selection refrigerant flow controls: types, operation and applications effects from sub-cooling distributor types, operation and applications selection tables system load balance point: graphical representation line sizing and design: quick selection tables velocity tables pressure drop in lines and fittings oil migration stabilisation refrigerant velocity effect of varying system capacity oil traps risers liquid migration automatic controls: fin spacing, suction temp to evaporator suction hot-gas bypass valves electronic control of valves programmable logic controller (PLC) control refrigerant regulating valves solenoid valves condenser pressure regulating valves evaporator pressure regulating valves crankcase pressure regulating valves cycling controls pressure-stats thermostats defrost controls monitoring and alarm controls refrigeration automation systems control strategies control modes relevant industry standards, including industry practices and technologies relevant job safety assessments or risk mitigation processes relevant manufacturer specifications relevant WHS/OHS legislated requirements relevant workplace documentation relevant workplace policies and procedures.

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