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.

Overview of assessment

A person who demonstrates competency in this unit must be able to maintain and repair commercial and/or industrial refrigeration and/or air conditioning controls. Competency in this unit cannot be claimed until all prerequisites have been satisfied.

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

Assessors must be satisfied that the candidate can competently and consistently perform all elements of the unit as specified by the criteria, including required knowledge, and be capable of applying the competency in new and different situations and contexts.

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, that is the candidate is not in productive work, 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.

This unit could be assessed in conjunction with any other units addressing the safety, quality, communication, materials handling, recording and reporting associated with the repair/replacement of commercial and/or industrial refrigeration and/or commercial air conditioning controls, or other units requiring the exercise of the skills and knowledge covered by this unit.

Method of assessment

Assessors should gather a range of evidence that is valid, sufficient, current and authentic. Evidence can be gathered through a variety of ways including direct observation, supervisor's reports, project work, samples and questioning. Questioning techniques should not require language, literacy and numeracy skills beyond those required in this unit of competency. The candidate must have access to all tools, equipment, materials and documentation required. The candidate must be permitted to refer to any relevant workplace procedures, product and manufacturing specifications, codes, standards, manuals and reference materials.

Guidance information for assessment

Required skills

Look for evidence that confirms skills in:

reading, interpreting and following information on written job instructions, specifications, standard operating procedures, charts, lists, drawings and other applicable reference documents

using tools, techniques and equipment necessary to check commercial and/or industrial refrigeration and/or air conditioning controls for correct operation

comparing system, controls and component performance/operation against specifications

identifying faulty components and non-compliances

making required adjustments to achieve specifications

sourcing and using relevant catalogues/lists

applying safety procedures, standard operating procedures and legislative requirements to all work undertaken

documenting results of the adjustments

planning and sequencing operations

checking task-related information

undertaking calculations and numerical operations within the scope of this unit

Required knowledge

Look for evidence that confirms knowledge of:

refrigeration/air conditioning system operational requirements and specifications

application of common system/circuit components and controllers

the importance of following installation procedures in terms of control operation, safety and reliability

measuring instruments/equipment and specifications for checking air temperatures, air flows, air quality and air properties

procedures for reporting non-conformances

operational sequence of the system

typical adjustments to correct sequencing variations from specification

procedures for recording/reporting modifications/alterations/maintenance etc.

typical causes of component failure

procedures for rectifying faulty conditions and components

maintenance requirements

procedures for returning to service and commissioning refrigeration/air conditioning control systems

hazards and control measures associated with maintaining and repairing commercial and/or industrial refrigeration and/or air conditioning controls, including housekeeping

safe workplace practices and procedures

codes and regulations relevant to the refrigeration / air conditioning industry including environmental and ozone and greenhouse substance legislation

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.

Appropriate test equipment

Pressure gauges, multimeters, ampmeters, megohm meter, analyser

Modifications/alterations

Pressure control settings, timer settings, thermostat settings

Must comply with manufacturers' specifications, and all changes in site drawings/documents should be documented

Corrective action

Replacement, repair, adjustment

Maintenance procedures

Overhaul of major system components, cleaning of major system components, testing operation of all control and safety devices