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Elements and Performance Criteria

1. Undertake preventative maintenance checks on refrigerant flow controls
   • The location and operation of the control is understood.
   • The operational parameters of the refrigerant control are understood.
   • Visual inspection and testing with appropriate test equipment is carried out by following refrigeration principles, procedures and safety requirements.
   • The refrigerant type is correctly identified.
2. Undertake fault finding on refrigerant flow controls
   • Flow control is identified correctly.
   • The characteristics of the flow control are understood.
   • The operational function of the flow control and associated valves are inspected and tested.
   • Appropriate test equipment can be selected/used safely.
   • Correct operation of the flow control is assessed against specification.
3. Repair or replace refrigerant flow control
   • Using manufacturers' catalogues and specifications, appropriate flow control or components relevant to system operation are selected for replacement/repair.
   • The refrigerant is removed/contained safely from the system in accordance with refrigeration principles and procedures and relevant standards and codes.
   • Faulty components are dismantled and repaired /replaced to manufactures' specifications as required.
   • Replacement parts are selected from manufactures catalogues according to required specifications.
4. Return to service refrigerant flow control
   • System is evacuated and recharged with refrigerant safely, in accordance with refrigeration principles and procedures and relevant standards and codes.
   • System is leak tested in accordance with refrigeration principles/procedures and relevant standards and codes.
   • Flow control is adjusted to manufactures' specifications in accordance with refrigeration principles and procedures and relevant standards and codes.
   • Performance check is undertaken in accordance with refrigeration principles and procedures and relevant standards and codes.
   • Maintenance records service reports are completed by appropriate designated means.

Required Skills

Required skills

Look for evidence that confirms skills in using tools techniques and equipment necessary to check for correct operation obtaining and interpreting specifications comparing system and component performanceoperation against specification select replacement controls andor components identifying faulty components and noncompliances using appropriate test equipment to identify noncompliance safely remove contain or add refrigerant to relevant Australian standards or codes making required adjustments to achieve specifications sourcing and using relevant catalogueslists applying safety procedures standard operating procedures and legislative requirements to all work undertaken documenting results of the adjustments

Required knowledge

Look for evidence that confirms knowledge of operation of refrigerant flow controls including TEV internal equalised external equalised direct operating servo operated pilot operated MOP cross charged gas charged capillary tube thermo electric electronic TEV and controllers low side floats high side floats distributors reversing valves solenoid valves non return valves EPR CPR condenser bypass valves liquid level controllers AX valves hand expansion valves measuring instrumentsequipment specifications and procedures for checking temperatures measuring instrumentsequipment specifications and procedures for checking components procedures for reporting nonconformances procedures and sequence for performing preventative maintenance specifications operational characteristics and process for identifying system components process for localising and confirming faulty components process for identifying refrigerant type procedures and all legislative and regulatory requirements for safely removing the refrigerant and charging the system procedures for dismantling repairing reassembling and testing components procedures for selecting replacement parts procedures for completing maintenance recordsservice reports

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 adjust repair or replace refrigerant flow controls either liquid or vapour to manufactures specifications safely to relevant Australian standards codes and regulations 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 Where assessment occurs off the job ie the candidate is not in productive work 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 repairreplacement or adjustment of refrigerant flow 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 supervisors 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

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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.
Control	Selected from required knowledge list
Parameters	Operational values
Refrigerant control	Could be any selected from list in required knowledge
Characteristics	Operational parameters of the flow control
Associated valves	Check valves, solenoid valves
Test equipment	Refrigeration gauges, thermometers, multimeter, vacuum pump, leak detector, associated hand tools, specialised hand tools
Components	Any part of any flow control selected from list in required knowledge
Performance	Pressures, temperatures and relationships

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