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Elements and Performance Criteria

  1. Prepare to recover refrigerants, pressure test, evacuate, charge and leak test refrigeration systems.
  2. Recover refrigerants, pressure test, evacuate, charge and leak test refrigeration systems.
  3. Complete and report refrigerants recovery, pressure test, evacuate, charge and leak test work

Required Skills

This describes the essential skills and knowledge and their level required for this unit

Evidence shall show that knowledge has been acquired of safe working practices and recovering pressure and leak testing evacuating and charging refrigerants

All knowledge and skills detailed in this unit should be contextualised to current industry practices and technologies

KSEJA Refrigerants and lubricants

Evidence shall show an understanding of refrigerants and lubricants applying safe working practices and relevant Standards Codes and Regulations to an extent indicated by the following aspects

T Introduction to refrigerants

Purpose of refrigerant

Primary secondary and expendable refrigerants

Ideal properties

Pure azeotropic zeotropic and blend refrigerants

General safety requirements and personal protection equipment

T Relevant Acts Regulations Codes and Standards

The ozone layer function ozone depleting substances

The ozone protection act and regulation

State and federal agencies Dept of the environment water heritage and the arts Dept of climate change Australian Refrigeration Council Ltd etc

State and federal licensing requirements

Refrigerant handling code of practice

Relevant Standards

Standards philosophy and format

How to read and apply a standard

Equipment manufactures specifications

T Refrigerant properties

Commonly used types including CFC HCFC HFC high pressure and natural refrigerants

Terms blend azeotrope zeotrope glide CFC HCFC HFC HC bubble point dew point critical point ODP GWP etc

Typical properties and applications of the current refrigerants used in systems boiling point glide composition components comparative latent heat performance etc

T Safe handling of refrigerants

Refrigerant identification and the numbering system AS part sect

System refrigerant identification labeling requirements Code of Practice

Typical hazards classification groups AS part sect and handling precautions inhalation skin contact cardiac sensitization decomposition reaction with moisture etc

Personal safety MSDS all common refrigerants plus phosgene recommended PPE

Cylinders cylinder terminology WC tare etc transporting safely

Safe Filling density and water capacity methods

Decanting methods pumping temperature differential etc

Recovery cylinders and their safe filling

Disposal of recovered refrigerants including RRA

T Refrigeration oil

Types mineral POE AB etc and their applications

Basic properties miscibility dielectric strength viscosity and hygroscopic abilities

Typical issues regarding compatibility neoprene and POE POE and mineral etc

Safe handling MSDS POEs Mineral ABs Residual acids in used oils

Applications for the various compressor lubricants used in the trade

T Recovery and reclaim procedures

Refrigerant recovery systems and procedures

Vapour

Liquid

Recovery cylinders

Disposing of recovered refrigerants

Safety and general issues when recovering refrigerant

T Pressure testing

Define

Pressure testing procedures and test pressures per Standards

Codes Regulations and manufacturers requirements

Safety and general issues when pressure testing refrigeration systems

T Leak detection

Leak detector types and applications electronic halide bubble ultra violet Sulphur stick litmus paper etc

Hazards and related safe working practices working around rotating machinery open flame ultra violet light etc

Care and maintenance delicate electronic equipment changing sensor tip filters changing gas cartridges etc

Calibration auto calibrating send to a specialist etc

Leak testing methods

T Evacuation and dehydration

Evacuation and dehydration

Deep vacuum methods

Triple evacuation

Vacuum Measurement

Instruments

Drop test

Vacuum Pumps

Types size and applications

Use and connections

Care and maintenance

Safety and general issues when evacuating refrigeration systems

T Refrigerant and oil charging

Refrigerant cylinders storage and safe handling

Refrigerant charging methods

Vapour

Liquid

Safety and general issues when charging refrigeration systems including personal protection equipment

Refrigerant oil removal and addition tools procedures and safety

T System contamination

Contaminants Noncondensables moisture acids carbon copper etc

Effects of contamination Acid motor burnout oil contamination copper plating seizing RMD blockage excessive condensing temps etc

Practicesprocedures that cause contamination

Methods and components use to remove contamination

Filter dryers liquid suction burnout

Dry nitrogen

Flushing agents

Evacuation

T Basic refrigeration component replacement

Risks of working with refrigerants and rotating equipment

Refrigerant isolationpump downrecovery

Prevention of system contamination

Protection of damage to surrounding equipment environment

Replace basic components on a refrigeration system for example filter dryer sight glass

Pressure testing evacuation checking refrigerant charge refrigerant charging and leak detection

Evidence Required

The evidence guide provides advice on assessment and must be read in conjunction with the Performance Criteria Required Skills and Knowledge the Range Statement and the Assessment Guidelines for this Training Package

The Evidence Guide forms an integral part of this Unit It must be used in conjunction with all parts of this unit and performed in accordance with the Assessment Guidelines of this Training Package

Overview of Assessment

Longitudinal competency development approaches to assessment such as Profiling require data to be reliably gathered in a form that can be consistently interpreted over time This approach is best utilised in Apprenticeship programs and reduces assessment intervention It is the industrypreferred model for apprenticeships However where summative or final assessment is used it is to include the application of the competency in the normal work environment or at a minimum the application of the competency in a realistically simulated work environment In some circumstances assessment in part or full can occur outside the workplace However it must be in accordance with industry and regulatory policy

Methods chosen for a particular assessment will be influenced by various factors These include the extent of the assessment the most effective locations for the assessment activities to take place access to physical resources additional safety measures that may be required and the critical nature of the competencies being assessed

The critical safety nature of working with electricity electrical equipment gas or any other hazardous substancematerial carries risk in deeming a person competent Sources of evidence need to be rich in nature to minimise error in judgment

Activities associated with normal everyday work influence decisions about howhow much the data gathered will contribute to its richness Some skills are more critical to safety and operational requirements while the same skills may be more or less frequently practised These points are raised for the assessors to consider when choosing an assessment method and developing assessment instruments Sample assessment instruments are included for Assessors in the Assessment Guidelines of this Training Package

Critical aspects of evidence required to demonstrate competency in this unit

Before the critical aspects of evidence are considered all prerequisites must be met

Evidence for competence in this unit shall be considered holistically Each Element and associated performance criteria shall be demonstrated on at least two occasions in accordance with the Assessment Guidelines UEE Evidence shall also comprise

Evidence for competence in this unit shall be considered holistically. Each Element and associated performance criteria shall be demonstrated on at least two occasions in accordance with the 'Assessment Guidelines - UEE07 '. Evidence shall also comprise:

A representative body of work performance demonstrated within the timeframes typically expected of the discipline work function and industrial environment In particular this shall incorporate evidence that shows a candidate is able to

Implement Occupational Health and Safety workplace procedures and practices including the use of risk control measures as specified in the performance criteria and range statement

Apply sustainable energy principles and practices as specified in the performance criteria and range statement

Demonstrate an understanding of the essential knowledge and associated skills as described in this unit It may be required by some jurisdictions that RTOs provide a percentile graded result for the purpose of regulatory or licensing requirements

Demonstrate an appropriate level of skills enabling employment

Conduct work observing the relevant Anti Discrimination legislation regulations polices and workplace procedures

Demonstrated consistent performance across a representative range of contexts from the prescribed items below

Recover pressure and leak test evacuate and charge refrigerants and lubricants as described in and including

A

Selecting appropriate materials and equipment

B

Testing refrigerant and lubricant for contamination

C

Removing and storing refrigerant correctly

D

Conducting pressure testing at the appropriate pressure level and without damaging components

E

Locating and rectifying leaks

F

Decontaminating and evacuating the system to the required level

G

Charging the system with the appropriate refrigerant

H

Completing the necessary documentation

I

Dealing with unplanned events by drawing on essential knowledge and skills to provide appropriate solutions incorporated in the holistic assessment with the above listed items

Context of and specific resources for assessment

This unit should be assessed as it relates to normal work practice using procedures information and resources typical of a workplace This should include

OHS policy and work procedures and instructions

Suitable work environment facilities equipment and materials to undertake actual work as prescribed by this unit

These should be part of the formal learningassessment environment

Note Where simulation is considered a suitable strategy for assessment conditions must be authentic and as far as possible reproduce and replicate the workplace and be consistent with the approved industry simulation policy

Note:
Where simulation is considered a suitable strategy for assessment, conditions must be authentic and as far as possible reproduce and replicate the workplace and be consistent with the approved industry simulation policy.

Evidence should show demonstrated competency in recovering pressure and leak testing evacuate and charging refrigerants

Method of assessment

This unit shall be assessed by methods given in Volume Part Assessment Guidelines

Note Competent performance with inherent safe working practices is expected in the Industry to which this unit applies This requires assessment in a structured environment which is intended primarily for learningassessment and incorporates all necessary equipment and facilities for learners to develop and demonstrate the essential knowledge and skills described in this unit

Note:
Competent performance with inherent safe working practices is expected in the Industry to which this unit applies. This requires assessment in a structured environment which is intended primarily for learning/assessment and incorporates all necessary equipment and facilities for learners to develop and demonstrate the essential knowledge and skills described in this unit.

Concurrent assessment and relationship with other units

For optimisation of training and assessment effort competency development in this unit may be arranged concurrently with unit

UEENEEJB

UEENEEJ007B

Install refrigerationampair conditioning systems major components and associated equipment


Range Statement

8) This relates to the unit as a whole providing the range of contexts and conditions to which the performance criteria apply. It allows for different work environments and situations that will affect performance.

This unit must be demonstrated in relation to recovery, testing and charging refrigeration systems used for refrigeration or air conditioning encompassing the following:

recovering refrigerant and lubricant from an existing system that may contains contaminants

pressure and leak testing a newly installed or repaired system

evacuating a system in preparation for charging with refrigerant

selection a suitable refrigerant and lubricant for a given application

charging a system with refrigerant and lubricant with minimal loss

Generic terms used throughout this Vocational Standard shall be regarded as part of the Range Statement in which competency is demonstrated. The definition of these and other terms that apply are given in Volume 2, Part 2.1.