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Elements and Performance Criteria

1. Prepare to design complex commercial refrigeration system
   • WHS/OHS requirements and workplace procedures for a given work area are identified, obtained and applied
2. WHS/OHS risk control measures and workplace procedures are followed in preparation for the work
3. Scope of the proposed refrigeration system is determined from the design brief and/or consultations with relevant person/s
4. Design development work is planned in accordance with workplace procedures for timelines in consultation with others involved
5. Design complex commercial refrigeration system
   • Relevant commercial refrigeration processes and methods are applied to the design
6. Alternative concepts for design are evaluated in accordance with the design brief
7. Safety, functionality and budgetary considerations are incorporated in the design specifications
8. System design draft is checked for compliance in accordance with the design brief and relevant industry standards
9. System design is documented and submitted to relevant person/s for approval in accordance with workplace procedures
10. Unplanned events are dealt with in accordance with problem-solving techniques and workplace procedures
11. Obtain approval for complex commercial refrigeration system design
    • System design is presented to customer and/or relevant person/s in accordance with workplace procedures
12. Requests for alterations to the design are negotiated with relevant person/s in accordance with workplace procedures
13. Final design is documented and approval obtained from relevant person/s in accordance with workplace procedures
14. Quality of work is monitored in accordance with workplace procedures and relevant industry standards

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.
Designing a complex commercial refrigeration system must include at least the following:	one multiple major component, including: compressors condenser evaporators circuits and/or systems associated components and 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:

developing outlines of alternative designs developing the design within the safety, regulatory, functional requirements and budget limitations documenting and presenting design effectively successfully negotiating design alteration requests obtaining approval for final design dealing with unplanned events applying relevant work health and safety (WHS)/occupational health and safety (WHS/OHS) requirements, including using risk control measures designing complex commercial refrigeration system preparing to design complex commercial refrigeration system.

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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:

complex commercial refrigeration system design, safe working practices and relevant standards, codes and regulations, including: commercial refrigeration system types: medium and low temperature applications operating conditions system operating and service requirements refrigerant types components multiple evaporator systems multiple temperature systems multiple compressor (rack) systems two stage compressors multiplex systems defrost requirements and methods electric defrost systems hot gas defrost systems cool gas defrost systems manufacturer's data: rating tables selection tables catalogues operating characteristics: effects of temperature glide with blended refrigerants pH charts refrigerating effect heat of compression heat rejected on high side of the system required mass flowrate of refrigerant volume flowrate at various points in system theoretical compressor power required condenser capacity refrigerant flow controls: refrigerant regulating valves solenoid valves expansion valves pressure regulating valves automatic systems controls: cycling controls pressure-stats thermo-stats defrost controls monitoring and alarm controls energy management systems refrigeration automation system control strategies control modes system design: required cooling capacity per day running time and required system cooling capacity system capacity control for peak and low load refrigeration system diagrams refrigerant, equipment, major component, controls, piping and accessory selection problem-solving techniques relevant job safety assessments or risk mitigation processes relevant manufacturer specifications relevant WHS/OHS legislated requirements relevant workplace budget, quality, policies and procedures relevant workplace documentation.

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