Assessor Resource

UEERA0032
Diagnose and rectify faults in complex air conditioning/refrigeration systems

Assessment tool

Version 1.0
Issue Date: May 2024


This unit involves the skills and knowledge required to diagnose and rectify faults in complex air conditioning/refrigeration systems.

It includes working safely, interpreting technical data and applying knowledge of complex refrigeration/air conditioning system operating parameters to logical fault-finding processes. It also includes implementing fault rectification, safety and functional testing, and completing and reporting fault diagnosis and rectification activities and outcomes.

To undertake this unit, the learner must have a Trainee Refrigerant Handling Licence as it includes work on refrigeration and air conditioning equipment that carries the risk of a fluorocarbon refrigerant being emitted.

The skills and knowledge described in this unit require a national Refrigerant Handling Licence as it includes work on refrigeration and air conditioning equipment that carries the risk of a fluorocarbon refrigerant being emitted while decanting the refrigerant or manufacturing, installing, commissioning, servicing, maintaining or decommissioning refrigeration and air conditioning equipment.

The skills and knowledge described in this unit require a licence or permit to practice in the workplace where work is carried out on electrical installations which are designed to operate at voltages greater than 50 volt (V) alternating current (a.c.) or 120 V direct current (d.c.).

Competency development activities in this unit are subject to regulations directly related to licensing. Where a licence or permit to practice is not held, skills and knowledge described in this unit require a relevant contract of training, such as an Australian Apprenticeship.

Additional and/or other conditions may apply in some jurisdictions subject to regulations related to refrigeration, air conditioning or electrical work. Practice in the workplace and during training is also subject to work health and safety (WHS)/occupational health and safety (OHS) regulations.

Permits may also be required for some work environments, such as confined spaces, working aloft, near live electrical apparatus and site rehabilitation.

You may want to include more information here about the target group and the purpose of the assessments (eg formative, summative, recognition)


Evidence Required

List the assessment methods to be used and the context and resources required for assessment. Copy and paste the relevant sections from the evidence guide below and then re-write these in plain English.

Evidence required to demonstrate competence in this unit must be relevant to and satisfy all of the requirements of the elements, performance criteria and range of conditions on at least one occasion and include:

applying logical diagnostic methods

using fault scenarios to test the cause of system faults

identifying faults and competency needed to rectify them

rectifying faults in system controls

verifying that the system operates correctly

dealing with unplanned events

applying relevant legislations, industry standards, codes of practice and regulations

applying relevant work health and safety (WHS)/occupational health and safety (WHS/OHS) requirements, including:

applying safe working practices

hazard identification and reporting

implementing risk control measures

completing and reporting fault diagnosis and rectification activities

determining need to test or measure live work

isolating circuits/machines/plant

using relevant tools, equipment and testing devices.

Evidence required to demonstrate competence in this unit must be relevant to and satisfy all of the requirements of the elements, performance criteria and range of conditions and include knowledge of:

complex refrigeration and air conditioning system fault finding and repair, safe working practices and relevant standards, codes and regulations, including:

fault-finding techniques including:

factors to consider in clarifying the nature of a fault:

initial fault report

confirmation of symptoms of the fault

comparison of symptoms with normal operation

effect to cause reasoning — assumptions of possible causes

methods for testing assumptions encompassing:

visual inspection

sectional testing

split-half tests

component isolation

dealing with intermittent faults

causes of intermittent faults are vibration, shock, changes in temperature and electromagnetic interference

refrigeration system analysis, including:

pressure enthalpy definitions:

high pressure and low-pressure refrigerants

triple point of new refrigerants

glide of trinary blends

differential evaporation of refrigerant blends

variable refrigerant volume

refrigeration cycle, including:

expansion process

vaporising process

compression process

condensing process

compression ratio

enthalpy processes, including:

co-efficient of performance

effect of suction temperature on cycle efficiency

effect of condensing temperature on cycle efficiency

actual refrigerating cycles, including:

design operating conditions

effects of superheating suction vapour

superheating without useful cooling

superheating that produces useful cooling

superheating in suction piping outside the refrigerated space

superheating the vapour inside the refrigerated space

effects of subcooling the liquid

effects liquid - suction heat exchangers

effects of pressure losses resulting from friction

refrigeration cycle faults, including:

symptoms and causes

measurements and fault confirmation tests

air conditioning system analysis, including:

psychrometric chart, including:

properties, definitions and units

plotting conditions:

RA, SA, OA and MA

psychometric processes, including:

heating

cooling only

cooling and dehumidification

cooling, dehumidification and reheat

design operating conditions, including:

indoor and outdoor wet and dry bulb temperatures

volume flow rate supply, return and outdoor air

air conditioning system faults, including:

symptoms and causes

measurements and fault confirmation tests

power and control system analysis, including:

power and control circuit diagrams

sequence of operation

manufacturers diagrams, specifications and instructions

power and control circuit faults:

symptoms and causes

measurements and fault confirmation tests

relevant measurements and estimations

relevant risk mitigation processes

relevant WHS/OHS legislated requirements, including:

environmental and sustainable energy principles and practices

safe working practices

relevant workplace policies and procedures

relevant workplace documentation.

Assessors must hold credentials specified within the Standards for Registered Training Organisations current at the time of assessment.

Assessment must satisfy the Principles of Assessment and Rules of Evidence and all regulatory requirements included within the Standards for Registered Training Organisations current at the time of assessment.

Assessment must occur in workplace operational situations where it is appropriate to do so; where this is not appropriate, assessment must occur in simulated workplace operational situations that replicate workplace conditions.

Assessment processes and techniques must be appropriate to the language, literacy and numeracy requirements of the work being performed and the needs of the candidate.

Resources for assessment must include access to:

a range of relevant exercises, case studies and/or other simulations

relevant and appropriate materials, tools, equipment and personal protective equipment (PPE) currently used in industry

applicable documentation, including workplace procedures, equipment specifications, regulations, codes of practice and operation manuals.

Submission Requirements

List each assessment task's title, type (eg project, observation/demonstration, essay, assingnment, checklist) and due date here

Assessment task 1: [title]      Due date:

(add new lines for each of the assessment tasks)

Assessment Tasks

Copy and paste from the following data to produce each assessment task. Write these in plain English and spell out how, when and where the task is to be carried out, under what conditions, and what resources are needed. Include guidelines about how well the candidate has to perform a task for it to be judged satisfactory.

Range is restricted to essential operating conditions and any other variables essential to the work environment.

Non-essential conditions may be found in the UEE Electrotechnology Training Package Companion Volume Implementation Guide.

Diagnosing and rectifying faults must include at least four faults in the following complex refrigeration/air conditioning systems:

multiple major components (i.e. compressors, condenser or evaporators)

circuits or systems and associated components and controls

Evidence required to demonstrate competence in this unit must be relevant to and satisfy all of the requirements of the elements, performance criteria and range of conditions on at least one occasion and include:

applying logical diagnostic methods

using fault scenarios to test the cause of system faults

identifying faults and competency needed to rectify them

rectifying faults in system controls

verifying that the system operates correctly

dealing with unplanned events

applying relevant legislations, industry standards, codes of practice and regulations

applying relevant work health and safety (WHS)/occupational health and safety (WHS/OHS) requirements, including:

applying safe working practices

hazard identification and reporting

implementing risk control measures

completing and reporting fault diagnosis and rectification activities

determining need to test or measure live work

isolating circuits/machines/plant

using relevant tools, equipment and testing devices.

Evidence required to demonstrate competence in this unit must be relevant to and satisfy all of the requirements of the elements, performance criteria and range of conditions and include knowledge of:

complex refrigeration and air conditioning system fault finding and repair, safe working practices and relevant standards, codes and regulations, including:

fault-finding techniques including:

factors to consider in clarifying the nature of a fault:

initial fault report

confirmation of symptoms of the fault

comparison of symptoms with normal operation

effect to cause reasoning — assumptions of possible causes

methods for testing assumptions encompassing:

visual inspection

sectional testing

split-half tests

component isolation

dealing with intermittent faults

causes of intermittent faults are vibration, shock, changes in temperature and electromagnetic interference

refrigeration system analysis, including:

pressure enthalpy definitions:

high pressure and low-pressure refrigerants

triple point of new refrigerants

glide of trinary blends

differential evaporation of refrigerant blends

variable refrigerant volume

refrigeration cycle, including:

expansion process

vaporising process

compression process

condensing process

compression ratio

enthalpy processes, including:

co-efficient of performance

effect of suction temperature on cycle efficiency

effect of condensing temperature on cycle efficiency

actual refrigerating cycles, including:

design operating conditions

effects of superheating suction vapour

superheating without useful cooling

superheating that produces useful cooling

superheating in suction piping outside the refrigerated space

superheating the vapour inside the refrigerated space

effects of subcooling the liquid

effects liquid - suction heat exchangers

effects of pressure losses resulting from friction

refrigeration cycle faults, including:

symptoms and causes

measurements and fault confirmation tests

air conditioning system analysis, including:

psychrometric chart, including:

properties, definitions and units

plotting conditions:

RA, SA, OA and MA

psychometric processes, including:

heating

cooling only

cooling and dehumidification

cooling, dehumidification and reheat

design operating conditions, including:

indoor and outdoor wet and dry bulb temperatures

volume flow rate supply, return and outdoor air

air conditioning system faults, including:

symptoms and causes

measurements and fault confirmation tests

power and control system analysis, including:

power and control circuit diagrams

sequence of operation

manufacturers diagrams, specifications and instructions

power and control circuit faults:

symptoms and causes

measurements and fault confirmation tests

relevant measurements and estimations

relevant risk mitigation processes

relevant WHS/OHS legislated requirements, including:

environmental and sustainable energy principles and practices

safe working practices

relevant workplace policies and procedures

relevant workplace documentation.

Assessors must hold credentials specified within the Standards for Registered Training Organisations current at the time of assessment.

Assessment must satisfy the Principles of Assessment and Rules of Evidence and all regulatory requirements included within the Standards for Registered Training Organisations current at the time of assessment.

Assessment must occur in workplace operational situations where it is appropriate to do so; where this is not appropriate, assessment must occur in simulated workplace operational situations that replicate workplace conditions.

Assessment processes and techniques must be appropriate to the language, literacy and numeracy requirements of the work being performed and the needs of the candidate.

Resources for assessment must include access to:

a range of relevant exercises, case studies and/or other simulations

relevant and appropriate materials, tools, equipment and personal protective equipment (PPE) currently used in industry

applicable documentation, including workplace procedures, equipment specifications, regulations, codes of practice and operation manuals.

Copy and paste from the following performance criteria to create an observation checklist for each task. When you have finished writing your assessment tool every one of these must have been addressed, preferably several times in a variety of contexts. To ensure this occurs download the assessment matrix for the unit; enter each assessment task as a column header and place check marks against each performance criteria that task addresses.

Observation Checklist

Tasks to be observed according to workplace/college/TAFE policy and procedures, relevant legislation and Codes of Practice Yes No Comments/feedback
WHS/OHS requirements and procedures are identified, obtained and implemented 
 
 
 
 
 
WHS/OHS risk control measures and workplace procedures for carrying out the work are followed 
 
 
 
 
 
 
 
 
 
 
WHS/OHS work completion risk control measures and procedures are followed 
 
 
 

Forms

Assessment Cover Sheet

UEERA0032 - Diagnose and rectify faults in complex air conditioning/refrigeration systems
Assessment task 1: [title]

Student name:

Student ID:

I declare that the assessment tasks submitted for this unit are my own work.

Student signature:

Result: Competent Not yet competent

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Assessor name:

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Assessment Record Sheet

UEERA0032 - Diagnose and rectify faults in complex air conditioning/refrigeration systems

Student name:

Student ID:

Assessment task 1: [title] Result: Competent Not yet competent

(add lines for each task)

Feedback to student:

 

 

 

 

 

 

 

 

Overall assessment result: Competent Not yet competent

Assessor name:

Signature:

Date:

Student signature:

Date: