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Elements and Performance Criteria

1. Prepare to design HVAC systems
   • WHS/OHS requirements and workplace procedures for a given work area are identified, obtained and applied
2. Scope of the refrigeration system is determined from design specifications and/or in consultations with relevant person/s
3. Safety and systems are identified, obtained and applied in accordance with relevant industry standards
4. Work supervisor and/or customer/s are consulted to determine functions and parameters of the system required in accordance with design specifications and workplace documentation
5. Design development work is planned in accordance with workplace procedures for timelines in consultation with others involved
   • WHS/OHS risk control measures and workplace procedures for carrying out the work are followed
6. Relevant refrigeration and food storage technology, refrigeration system components and piping are applied to developing the system design in accordance with workplace procedures and relevant industry standards
7. Safety, functionality and budgetary considerations are incorporated in the installation design
8. Equipment required is selected in accordance with design specifications and workplace procedures
9. Location of components are documented in accordance with workplace procedures and operation of system functions
10. System design draft is checked for compliance in accordance with the design brief and relevant industry standards
11. System design is documented and submitted to relevant person/s for approval
12. Unplanned events are dealt with in accordance with problem-solving techniques and workplace procedures
13. Obtain approval for HVAC design
    • System design is presented and explained to customer and/or relevant person/s
14. Requests for alterations to the design are negotiated with relevant person/s in accordance with workplace procedures
15. Final design is documented and approval obtained from relevant person/s
16. 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 HVAC systems must include at least the following:	two different HVAC systems, including at least one of the following: condenser compressor evaporator 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:

understanding required operating functions and parameters from the design specification developing the design within the safety, regulatory and 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 heating, ventilation and air conditioning (HVAC) systems preparing to design HVAC systems.

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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:

commercial HVAC system design, safe working practices and relevant standards, codes and regulations, including: design parameters for single-storey buildings (e.g. offices, restaurants, hotels and bars): customer and objective customer concept of environment desired economics client brief relevant design criteria: building purpose, location, orientation and shape external environment ambient conditions internal load diversity thermal capacity behaviour thermal load (full and partial) zoning and building usage: space and building occupancies, single purpose and multi-purpose system selection criteria: economics environment control requirements existing structures new structures system components space for equipment and system selection of appropriate system, equipment, ductwork and components systems and applications: design features, engineering and selection procedures for direct expansion air conditioning systems: air conditioning split systems and package units free blow and ducted fan coil units cooling, heat pump and electric heating air conditioning system components and piping selection air conditioning system components and piping selection, safe working practices and relevant standards, codes and regulations, including: relevant industry practices: AS/NZS 1677 Refrigerating systems SAA refrigeration code AS/NZS 3666 Air-handling and water systems of buildings ozone protection regulations ANSI/IIAR standards ANSI/ASHRAE mechanical refrigeration and IIAR bulletins and standards equipment manufacturer’s specifications and practices 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 and medium and low back pressure compressors selection tables and motor selection liquid expansion devices: types, operation and applications effects from sub-cooling distributor types, operation and applications selection tables system load balance point encompassing: graphical representation line sizing and design velocity tables pressure drop in lines and fittings oil migration stabilisation refrigerant velocity effect of varying system capacity oil traps risers double risers liquid migration design for parallel components and multiplex systems automatic controls: fin spacing, suction temp to evaporator suction hot-gas bypass valves electronic control of valves and programmable logic controllers (PLC) 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 problem-solving techniques relevant job safety assessments or risk mitigation processes relevant WHS/OHS legislated requirements relevant workplace budget, quality, policies and procedures relevant workplace documentation.

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