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Elements and Performance Criteria

1. Undertake preventive maintenance checks/adjustment on commercial air conditioning systems and components
   • The temperature, quality, properties and flow of air delivered by the air conditioning system is checked for conformance to specification.
   • The noise/vibration levels of the air conditioning system components are checked for conformance to specification.
   • Preventative maintenance tasks are performed according to manufacturers' specifications using refrigeration and air conditioning principles and techniques.
2. Undertake fault finding on commercial air conditioning systems and components
   • System components are identified correctly.
   • The characteristics and operation of each component are explained.
   • The operational function of each component is inspected and tested.
   • Correct operation of each component is assessed against system specification.
3. Repair/replace faulty commercial air conditioning components
   • Faulty components are localised and malfunction confirmed by inspection and testing using air conditioning principles, procedures and safety requirements.
   • The refrigerant is removed safely from the system and contained in accordance with standard operating procedures and regulatory requirements where appropriate.
   • Faulty components are dismantled and repaired to manufacturers' specifications as required.
   • Replacement parts are selected from manufacturers' catalogues according to required specifications.
4. Return to service commercial air conditioning systems and components
   • Components are reassembled and tested for correct operation and assessed against specification.
   • The system is charged with correct refrigerant safely and in accordance with standard operating procedures and regulatory requirements.
   • Using air conditioning principles, correct operation of the equipment is verified.
   • Maintenance records/service reports are completed by appropriate designated means.

Required Skills

Required skills

Look for evidence that confirms skills in selecting and using equipment for testing and checking temperature flow and quality of the conditioned air checking taskrelated information identifying faults and noncompliances making required adjustments to achieve specifications comparing operation of each system component against system specification planning and sequencing operations entering routine and familiar information onto proformas and standard workplace forms reading interpreting and following information on written job instructions specifications standard operating procedures charts lists drawings and other applicable reference documents

Required knowledge

Look for evidence that confirms knowledge of measuring instrumentsequipment and specifications for checking air temperatures air flows air quality and air properties procedures for reporting nonconformances air properties controlled by the air conditioning system measuring instrumentsequipment and specifications required for checking component noise and vibration levels procedures and sequence for performing preventative maintenance on air conditioning systems specifications and process for identifying system components operational characteristics of the system components procedures for inspecting and testing system components and operational compliance procedures for assessing that the operation of system components meet system specification appropriate process for localising and confirming faulty components procedures and all legislative and regulatory requirements for safely removing the refrigerant from the system and charging the system procedures for dismantling and repairing faulty components and selecting replacement parts procedures for reassembling and testing components procedures for completing maintenance recordsservice reports hazards and control measures associated with maintaining and repairing commercial air conditioning systems and components safe work practices and procedures selecting and using equipment for testing electrical compliance of equipment documenting and reporting calculations and numerical operations within the scope of this unit

Evidence Required

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 air conditioning systems and components 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 maintenance and repair of commercial air conditioning systems and components 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 supervisors reports project work samples and questioning Questioning should not require language literacy and numeracy skills beyond those required in this unit 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

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Range Statement

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.
Preventative maintenance tasks	Check/adjust fan belts, check/clean filters, check/clean heat exchangers (evaporator and condenser), overhaul of major system components, cleaning of major system components, testing operation of all safety devices

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