Application
This unit involves the skills and knowledge required to select commercial refrigeration system equipment, components and accessories. It includes selecting commercial refrigeration system equipment and components, pipe work and controls. It also includes selecting refrigerant, condensing unit, evaporator, refrigerant controls, accessories, refrigerant and condensate pipe work, and system controls based on specifications, industry standards and manufacturer catalogues to determine calculated and deemed-to-comply solutions and documenting all selection information. The skills and knowledge described in this unit may, in some jurisdictions, require a licence or permit to practice in the workplace subject to regulations for undertaking refrigeration and air conditioning work. Practice in the workplace and during training is also subject to work health and safety (WHS)/occupational health and safety (OHS) regulations. No other licensing, legislative or certification requirements apply to this unit at the time of publication. |
Elements and Performance Criteria
Elements describe the essential outcomes. | Performance criteria describe the performance needed to demonstrate achievement of the element. | ||
Extent and nature of refrigeration installation is determined from job specifications | |||
Refrigeration system safety and regulatory compliance requirements are identified and applied | |||
Location of refrigeration equipment is determined from regulatory requirements, job specifications and site drawings | |||
Refrigeration piping is arranged to ensure safe and functional operation of the system | |||
Pipe work is arranged to comply with technical industry standards, job specifications and requirements | |||
Pipe and tubing are selected for suitability for the commercial environments it is to be installed | |||
Pipe and tubing are sized to meet refrigeration parameters and capacity requirements for the refrigerant to be used | |||
Pipe and tubing quantities are determined from equipment location diagrams and job specifications | |||
Refrigeration system equipment and components are selected to meet load requirements based on calculated or deemed-to-comply solutions | |||
Refrigerant liquid expansion valves are selected to meet functional, specified and regulatory requirements | |||
Automatic control devices are selected to meet functional, specified regulatory requirements, current voltage and ingress protection (IP) ratings | |||
Evidence is obtained that the selected refrigeration equipment and components comply with job requirements and industry standards | |||
Reasons for selections made including calculations are documented in accordance with workplace procedures | |||
Refrigeration installation arrangements and specifications for selected items are documented in accordance with workplace procedures and forwarded to appropriate person/s | |||
Evidence of Performance
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. |
Evidence of Knowledge
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. |
Assessment Conditions
Assessors must hold credentials specified within the Standards for Registered Training Organisations current at the time of assessment. Assessment must satisfy the Principles of Assessment and Rules of Evidence and all regulatory requirements included within the Standards for Registered Training Organisations current at the time of assessment. Assessment must occur in workplace operational situations where it is appropriate to do so; where this is not appropriate, assessment must occur in simulated workplace operational situations that replicate workplace conditions. Assessment processes and techniques must be appropriate to the language, literacy and numeracy requirements of the work being performed and the needs of the candidate. Resources for assessment must include access to: a range of relevant exercises, case studies and/or other simulations relevant and appropriate materials, tools, equipment and personal protective equipment (PPE) currently used in industry applicable documentation, including workplace procedures, equipment specifications, regulations, codes of practice and operation manuals. |
Foundation Skills
Foundation skills essential to performance are explicit in the performance criteria of this unit of competency. |
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 |
Sectors
Electrotechnology |
Competency Field
Refrigeration and air-conditioning |