Assessor Resource

UEERA0047
Install and commission carbon dioxide refrigeration systems, components and associated equipment

Assessment tool

Version 1.0
Issue Date: May 2024


This unit involves the skills and knowledge required to install and commission carbon dioxide (CO²) refrigeration system, components and associated equipment.

It includes installing and commissioning refrigeration equipment using CO² as a refrigerant excluding self-contained trans-critical systems.

It also includes applying safe working practice and refrigeration principles that apply to CO², following design specifications; testing, locating and rectifying faults and defective components; and completing the necessary installation and commissioning documentation.

The skills and knowledgein this unit will be applied by refrigeration and air conditioning technicians during the installation and commissioning of refrigeration systems using CO² refrigerant.

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 two separate occasions and include:

applying relevant work health and safety (WHS)/occupational health and safety (WHS/OHS) requirements and workplace procedures and practices, including using risk control measures

applying sustainable energy principles and practices

installing carbon dioxide (CO²) refrigeration system components, pipe work and associated equipment

dealing with unplanned events/situations in accordance with workplace procedures in a manner that minimises risk to personnel and equipment

discharging/charging refrigerant/lubricants and pressure testing the system without damage to components

documenting operating conditions correctly (commissioning)

identifying the conditions of the CO² refrigerant at various locations in the vapour compression and volatile secondary (liquid recirculation) system

installing, connecting, securing and aligning components and equipment and ensuring that equipment and pipe work is compliant with relevant industry standards, codes of practice and regulations

locating and rectifying leaks

optimising system performance and efficiency

pressure testing entire system at the appropriate design test pressures using dry nitrogen

reading and interpreting drawings to pipe work layouts and apparatus locations

recording measurements

removing system contaminants and evacuating

selecting and using appropriate measuring devices correctly

using calculation methods accurately

using methodical and efficient commissioning techniques.

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:

installation and commissioning procedures for CO² refrigeration systems, including:

materials and installation procedures:

material selection

copper pipe standards

steel pipe standards

pipe connections

pipe supports hangers and connections

arrangement of isolation valves

location of relief valves

commissioning:

pressure testing

evacuation and dehydration

charging refrigerant and lubricant

system testing and adjustment

documentation

operating conditions of CO² vapour compression and volatile secondary (liquid recirculation/cascade) system/s

relevant industry standards and practices

relevant manufacturer specifications

relevant job safety assessments or risk mitigation processes

relevant WHS/OHS legislated requirements

relevant workplace documentation

relevant workplace policies and procedures.

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.

Installing, connecting and commissioning CO² refrigeration system, components and associated equipment must include at least the following:

major components:

compressors

cascade condensers

evaporators

liquid recirculation pump/s

associated equipment:

refrigerant piping

refrigerant flow controls

cycling controls

safety controls

relief valves

isolation valves

monitoring and inspection accessories

Note: Steel pipe welding competency is not covered by this unit.

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 two separate occasions and include:

applying relevant work health and safety (WHS)/occupational health and safety (WHS/OHS) requirements and workplace procedures and practices, including using risk control measures

applying sustainable energy principles and practices

installing carbon dioxide (CO²) refrigeration system components, pipe work and associated equipment

dealing with unplanned events/situations in accordance with workplace procedures in a manner that minimises risk to personnel and equipment

discharging/charging refrigerant/lubricants and pressure testing the system without damage to components

documenting operating conditions correctly (commissioning)

identifying the conditions of the CO² refrigerant at various locations in the vapour compression and volatile secondary (liquid recirculation) system

installing, connecting, securing and aligning components and equipment and ensuring that equipment and pipe work is compliant with relevant industry standards, codes of practice and regulations

locating and rectifying leaks

optimising system performance and efficiency

pressure testing entire system at the appropriate design test pressures using dry nitrogen

reading and interpreting drawings to pipe work layouts and apparatus locations

recording measurements

removing system contaminants and evacuating

selecting and using appropriate measuring devices correctly

using calculation methods accurately

using methodical and efficient commissioning techniques.

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:

installation and commissioning procedures for CO² refrigeration systems, including:

materials and installation procedures:

material selection

copper pipe standards

steel pipe standards

pipe connections

pipe supports hangers and connections

arrangement of isolation valves

location of relief valves

commissioning:

pressure testing

evacuation and dehydration

charging refrigerant and lubricant

system testing and adjustment

documentation

operating conditions of CO² vapour compression and volatile secondary (liquid recirculation/cascade) system/s

relevant industry standards and practices

relevant manufacturer specifications

relevant job safety assessments or risk mitigation processes

relevant WHS/OHS legislated requirements

relevant workplace documentation

relevant workplace policies and procedures.

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 hazards, risk control methods, relevant standards, codes and legislation are obtained and applied 
 
 
 
 
 
Circuits/machines/plant are checked and isolated in accordance with WHS/OHS requirements and workplace procedures 
 
 
 
 
 
 
 
Commissioning work is appropriately sequenced in accordance with job specification 
 
 
 
 
 
 
 
 
 
 
 
Worksite is cleaned and made safe in accordance with workplace procedures 
 
 
 

Forms

Assessment Cover Sheet

UEERA0047 - Install and commission carbon dioxide refrigeration systems, components and associated equipment
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

UEERA0047 - Install and commission carbon dioxide refrigeration systems, components and associated equipment

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: