The evidence guide provides advice on assessment and must be read in conjunction with the performance criteria, required skills and knowledge, range statement and the Assessment Guidelines for the Training Package.

Critical aspects for assessment and evidence required to demonstrate competency in this unit

Assessors must be satisfied that the candidate can competently and consistently:

implement WHS workplace procedures and practices, including the use of risk control measures

demonstrate essential knowledge and to design a commercial refrigeration system

demonstrate competency within a timeframe typically expected of the discipline, work function and industrial environment

demonstrate the design of commercial a refrigeration system consistently. One application must be related to food storage. The design must include standard manufactured components and piping, adherence to design specifications, documenting system design and compliance with safety and regulatory requirements.

Context of and specific resources for assessment

This unit may be assessed on the job, off the job or a combination of both on and off the job. Where assessment occurs off the job, then an appropriate simulation must be used where the range of conditions reflects realistic workplace situations.

The competencies covered by this unit would be demonstrated by an individual working alone or as part of a team. The assessment environment should not disadvantage the candidate.

Method of assessment

Assessment must satisfy the endorsed Assessment Guidelines of the MEM05 Metal and Engineering Training Package.

Assessment methods must confirm consistency and accuracy of performance (over time and in a range of workplace relevant contexts) together with application of underpinning knowledge.

Assessment methods must be by direct observation of tasks and include questioning on underpinning knowledge to ensure correct interpretation and application.

Assessment may be applied under project-related conditions (real or simulated) and require evidence of process.

Assessment must confirm a reasonable inference that competency is not only able to be satisfied under the particular circumstance, but is able to be transferred to other circumstances.

Assessment may be in conjunction with assessment of other units of competency where required.

Guidance information for assessment

Assessment processes and techniques must be culturally appropriate and appropriate to the language and literacy capacity of the candidate and the work being performed.

Required skills

Required skills include:

selecting appropriate system components

applying relevant standards and regulatory requirements to the design task

documenting technical information and designs

interpreting and applying manufacturers’ data, tables and specifications

using relevant software tools effectively

interpreting drawings and specifications

communicating effectively with others

working in teams with others

communicating technical and procedural requirements to others

dealing effectively with unexpected situations

Required knowledge

Required knowledge includes:

standards and codes relevant to commercial refrigeration systems

calculation of capacity in heat exchangers

commercial refrigeration systems features and components:

applications

system requirements

operating conditions and criteria

refrigerants

refrigeration cycle

evaporators

condensers

compressors

liquid expansion devices

system load balance point

line sizing

automatic controls

commercial refrigeration and integration with an energy management system (E.M.S)

E.M.S. control components and the function and operating parameters

E.M.S system design, applications, operation and maintenance

The range statement relates to the unit of competency as a whole. It allows for different work environments and situations that may affect performance. Bold italicised wording, if used in the performance criteria, is detailed below. Essential operating conditions that may be present with training and assessment (depending on the work situation, needs of the candidate, accessibility of the item, and local industry and regional contexts) may also be included.

WHS requirements

WHS requirements include:

legislation

protective equipment

material safety management systems

hazardous substances and dangerous goods code

local safe operation procedures

awards provisions

Environmental requirements

Environmental requirements include:

relevant legislation, regulations and codes

correct handling and disposal of liquid and solid waste

elimination or minimisation of gas, fume, vapour and smoke emissions, including fugitive emissions

dust elimination, minimisation and control

minimisation of energy and water use

elimination or control of excessive noise

use and recycling of refrigerants

Appropriate personnel

Appropriate personnel may include:

supervisor

leading hand

foreman

manager

engineer

technician

trainer

mentor

team member

customer

client

Standards

Relevant standards may include:

AS 1677 Refrigeration systems

AS 3666 Air handling and water systems of buildings – Microbial control

Ozone protection regulations

International Institute of Ammonia Refrigeration (IIAR) Ammonia Data Book

American National Standards Institute (ANSI)/International Institute of Ammonia Refrigeration (IIAR) standards

American Society of Heating, Refrigerating and Air Conditioning Engineers (ASHRAE) and Mechanical Refrigeration standards

Enterprise procedures

Enterprise procedures may include:

use of tools and equipment

instructions, including job sheets, plans, drawings and designs

reporting and communication

manufacturer specifications

site operational procedures

references to industry standards