Unit of Competency Mapping – Information for Teachers/Assessors – Information for Learners

UEENEEJ182A Mapping and Delivery Guide
Repair and service secondary refrigeration systems

Version 1.0
Issue Date: May 2024


Qualification -
Unit of Competency UEENEEJ182A - Repair and service secondary refrigeration systems
Description 1) 1.1) This unit covers maintaining the effective and efficient operation of refrigeration equipment using non phase changing secondary refrigerant systems. It reinforces safe working practice, utilises service manuals, encompasses applying specialised knowledge of refrigeration principles to test and perform maintenance operations to these systems and to locate defective components and repair faults, completing reports on service and performance outcomes.
Employability Skills 3)This unit contains Employability SkillsThe required outcomes described in this unit of competency contain applicable facets of Employability Skills. The Employability Skills Summary of the qualification in which this unit of competency is packaged will assist in identifying Employability Skill requirements.
Learning Outcomes and Application 4) This competency standard is suitable for employment-based programs under an approved contract of training at the AQF level of the qualification in which the unit is first packaged or higher.The unit may be selected as an elective from the relevant schedule (see qualification packaging rules) provided that all prerequisite units are undertaken or addressed through recognition processes.This unit may be included in a skill set provided that it is listed in the schedule of electives (see Qualification Framework) and all prerequisite units are undertaken or addressed through recognition processes.Delivery and assessment of this unit should be undertaken within regard to the requirements of License to Practice (1.2 above), Prerequisite Competencies and Literacy and Numeracy skills (2 above) and the recommendations for concurrent assessment and relationship with other units (9.5 below).Practice in the workplace and during training is also subject to regulations directly related to occupational health and safety and where applicable contracts of training such as apprenticeships.Note: 1. Compliance with permits may be required in various jurisdictions and typically relates to the operation of plant, machinery and equipment such as elevating work platforms, powder operated fixing tools, power operated tools, vehicles, road signage and traffic control and lifting equipment. Permits may also be required for some work environments such as confined spaces, working aloft, near live electrical apparatus and site rehabilitation.2. Compliance may be required in various jurisdictions relating to currency in First Aid, confined space, lifting, risk safety measures etc.
Duration and Setting X weeks, nominally xx hours, delivered in a classroom/online/blended learning setting.
Prerequisites/co-requisites Prerequisite Unit(s)2) 2.1) CompetenciesGranting competency in this unit shall be made only after competency in the following unit(s) has/have been confirmed.UEENEEJ111A Diagnose and rectify faults in air conditioning and refrigeration systems and componentsUEENEEJ113A Commission air conditioning and refrigeration systemsUEENEEE101A Apply Occupational Health and Safety regulations, codes and practices in the workplaceUEENEEE102A Fabricate, assemble and dismantle utilities industry componentsUEENEEE103A Solve problems in ELV single path circuitsUEENEEE105A Fix and secure electrotechnology equipmentUEENEEE107A Use drawings, diagrams, schedules, standards, codes and specificationsUEENEEE137A Document and apply measures to control OHS risks associated with electrotechnology workUEENEEJ102A Prepare and connect refrigerant tubing and fittingsUEENEEJ103A Establish the basic operating conditions of vapour compression systemsUEENEEJ104A Establish the basic operating conditions of air conditioning systemsUEENEEJ106A Install refrigerant pipe work, flow controls and accessoriesUEENEEJ107A Install air conditioning and refrigeration systems, major components and associated equipmentUEENEEJ108A Recover, pressure test, evacuate, charge and leak test refrigerantsUEENEEJ110A Select refrigerant piping, accessories and associated controlsUEENEEJ153A Find and rectify faults motors and associated controls in refrigeration and air conditioning systemsUEENEEJ170A Diagnose and rectify faults in air conditioning and refrigeration control systemsUEENEEJ194A Solve problems in low voltage refrigeration circuitsUEENEEP012A Disconnect / reconnect composite appliances connected to low voltage installation wiringUEENEEP017A Locate and rectify faults in low voltage composite appliances using set proceduresNote:UEENEEJ111A and UEENEEJ113A - Those holding a 'Certificate III in Refrigeration and Air Conditioning trade qualification or equivalent" meet the requirements of these units and their pre-requisite requirements.
Competency Field 2.2) Literacy and numeracy skillsParticipants are best equipped to achieve competency in this unit if they have reading, writing and numeracy skills indicated by the following scales. Description of each scale is given in Volume 2, Part 3 'Literacy and Numeracy' Reading 4 Writing 4 Numeracy 4
Development and validation strategy and guide for assessors and learners Student Learning Resources Handouts
Activities 		Slides
PPT 		Assessment 1 Assessment 2 Assessment 3 Assessment 4
Elements of Competency Performance Criteria              
Element: Prepare to service and repair secondary refrigeration systems.
  • The type of secondary refrigeration system, components and operation are understood.
  • OHS procedures are identified, MSDS are obtained and understood, risk control measures are followed, PPE worn.
  • Safety hazards that have not previously been identified are documented and risk control measures devised and implemented.
  • The extent of faults is determined from reports, other documentation, observation and from discussion with appropriate personnel.
  • Appropriate personnel are consulted to ensure the work is coordinated effectively with others involved on the work site.
  • Tools, equipment and testing devices needed to carry out the work are obtained in accordance with established procedures and checked for correct operation and safety
       
Element: Carry out maintenance requirements
  • OHS requirements, regulation, workplace procedures and risk control measures and are followed.
  • Components are checked as being isolated, where necessary, in strict accordance OHS requirements and procedures.
  • Maintenance tests are performed on the primary cooling source, operating pressures, operating current, refrigerant charge, secondary flow rates, condenser cooling system, document results including any systems faults or non compliance to operational specifications.
  • Perform operational maintenance tests on the secondary refrigerant pumping / circulation devices, recording pressure and flow rates, document results, including faults or non compliance to system specification.
  • Use test kit and follow approved OH&S procedure including PPE, check the chemical integrity (dilution rate, anti bacterial and anti corrosion rates) of the secondary refrigerant, document result or any non compliance.
  • Secondary refrigerant pipework checked for leaks, insulation checked for soundness and pipework stability.
  • System components evaporators, blowers, other heat exchangers, heat recovery or defrost systems are checked for correct operation and cleanliness.
  • Test the control system operation, including safety controls, follow all OH&S guidelines, document results including any faults or non conformity to system specification.
       
Element: Repair secondary refrigeration systems.
  • OHS work completion risk control measures and procedures are followed.
  • Work site is cleaned and made safe in accordance with established procedures.
  • Justification for solutions used to solve machine problems is documented.
  • Work completion is documented and an appropriate person or persons notified in accordance with established procedures.
  • Perform any required repairs to systems components to achieve compliance to design operation and manufactures recommendation for effective operation.
  • Adjust control system as required to achieve compliance to design operation and manufactures recommendation, for effective operation.
  • Record flows, pressures and temperatures obtained before and after repair and compare to specifications, implementing contingency measures where required, to ensure compliance to design operation and manufactures recommendation for effective operation.
       
Element: Complete reports on maintenance and repair activities
  • Work completed safely, compliance is maintained with OH&S risk control measures.
  • Work area is cleaned and made safe in accordance with established workplace procedures and practices.
  • Report is written for service / maintenance and repair activities on secondary refrigeration system, non compliance after repair is reported to appropriate person.
       


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.

9) 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

9.1)

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 Industry's preferred 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. It is recognised that, 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 substance/material 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 every day work have a bearing on the decision as to how much and how detailed 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

9.2)

Before the critical aspects of evidence are considered all prerequisites shall 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 - 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:

Service and repair secondary refrigeration systems as described in 8) and including:

A

Applying logical diagnostic methods

B

Using fault scenarios to test the cause of system faults

C

Identifying faults and competency needed to rectify them

D

Rectifying faults in system controls

E

Verifying that the system operates correctly

F

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

9.3)

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 learning/assessment 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.

Evidence should show demonstrated competency in Service and repair secondary refrigeration systems.

Method of assessment

9.4)

This unit shall be assessed by methods given in Volume 1, Part 3 '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 primarily intended 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

9.5)

There are no concurrent assessment recommendations for this unit.

The critical aspects of occupational health and safety covered in unit UEENEEE001B and other discipline specific occupational health and safety units shall be incorporated in relation to this unit..

Submission Requirements

List each assessment task's title, type (eg project, observation/demonstration, essay, assignment, 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.

7) 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 solving problems in single and three phase low voltage machines.

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

KS01-EJ182A

Service and repair secondary refrigeration systems

Evidence shall show an understanding the secondary refrigeration systems, components, maintenance service and repair, applying safe working practices and relevant Standards, Codes and Regulations to an extent indicated by the following aspects:

T1 Secondary refrigeration systems

Introduction to secondary refrigeration systems

Safety

Basic operation

Typical applications

Safety in handling Secondary Refrigerants

Types of secondary Refrigerants

Need for anti bacterial and corrosion inhibitor use

Use of PPE (Personal Protective Equipment)

Major components location, purpose and operation

Safety

Major components Operation

Pipe work and insulation

Pumps

Cooling coils

Low temperature defrost systems

Heat recovery coils

Control system, pressure temperature, and safety

Control, balance and operational valves

T2 Service and repair secondary refrigeration systems

Carry out repairs to secondary refrigerant systems.

Safety

Appropriate personnel contacted before isolation repairs to pumps

Additions required to maintain chemical integrity of refrigerant

Repairs to cooling coils/ freezing coils

Repair system leaks

Repair pipework or insulation

Repair / replace defective control valves

Repair / replace defective control system component

Refrigerant disposal EPA requirements

Complete report on repair activities

Tools and equipment for repair work

Applicable Standards and Codes

T3 Maintenance procedures for secondary refrigeration systems

Maintenance requirements of secondary refrigeration systems.

Safety

Operation of primary cooling source

Tool and equipment

Operation of pumps

Chemical integrity of refrigerant

Cooling coils/ freezing coils operation

Leak detection additives

Leak test system

Pipework and insulation check

Control valve test

Control system check

Complete report on maintenance activities

Tools and equipment for maintenance work

Applicable Standards and Codes

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 service and repair including all of the following

secondary refrigeration systems , incorporating major components, primary chillers and circuits, secondary piping circuits, pumps, defrost systems, heat recovery systems, control systems and other associated secondary refrigeration components

This unit must be demonstrated in relation to service and repair in the following secondary refrigeration systems and components:

Evaporators/cooling coils, forced, natural draft,

Refrigerant flow controls,

Refrigerant piping and accessories,

Cycling controls,

Safety controls

Defrost controls,

Solenoid valves and associated piping,

Heat recovery systems,

Motors

Pumps, positive displacement and centrifugal,

Piping, insulation and associated equipment, air purgers.

Safe handling and testing of glycol and other secondary fluids.

All of the following apparatus:

Chilled water systems, (primary system)

Ice bank systems,

All of the following systems

cool rooms

freezer rooms

merchandising and display cabinets

other commercial or industrial applications.

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.

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
The type of secondary refrigeration system, components and operation are understood. 
OHS procedures are identified, MSDS are obtained and understood, risk control measures are followed, PPE worn. 
Safety hazards that have not previously been identified are documented and risk control measures devised and implemented. 
The extent of faults is determined from reports, other documentation, observation and from discussion with appropriate personnel. 
Appropriate personnel are consulted to ensure the work is coordinated effectively with others involved on the work site. 
Tools, equipment and testing devices needed to carry out the work are obtained in accordance with established procedures and checked for correct operation and safety 
OHS requirements, regulation, workplace procedures and risk control measures and are followed. 
Components are checked as being isolated, where necessary, in strict accordance OHS requirements and procedures. 
Maintenance tests are performed on the primary cooling source, operating pressures, operating current, refrigerant charge, secondary flow rates, condenser cooling system, document results including any systems faults or non compliance to operational specifications. 
Perform operational maintenance tests on the secondary refrigerant pumping / circulation devices, recording pressure and flow rates, document results, including faults or non compliance to system specification. 
Use test kit and follow approved OH&S procedure including PPE, check the chemical integrity (dilution rate, anti bacterial and anti corrosion rates) of the secondary refrigerant, document result or any non compliance. 
Secondary refrigerant pipework checked for leaks, insulation checked for soundness and pipework stability. 
System components evaporators, blowers, other heat exchangers, heat recovery or defrost systems are checked for correct operation and cleanliness. 
Test the control system operation, including safety controls, follow all OH&S guidelines, document results including any faults or non conformity to system specification. 
OHS work completion risk control measures and procedures are followed. 
Work site is cleaned and made safe in accordance with established procedures. 
Justification for solutions used to solve machine problems is documented. 
Work completion is documented and an appropriate person or persons notified in accordance with established procedures. 
Perform any required repairs to systems components to achieve compliance to design operation and manufactures recommendation for effective operation. 
Adjust control system as required to achieve compliance to design operation and manufactures recommendation, for effective operation. 
Record flows, pressures and temperatures obtained before and after repair and compare to specifications, implementing contingency measures where required, to ensure compliance to design operation and manufactures recommendation for effective operation. 
Work completed safely, compliance is maintained with OH&S risk control measures. 
Work area is cleaned and made safe in accordance with established workplace procedures and practices. 
Report is written for service / maintenance and repair activities on secondary refrigeration system, non compliance after repair is reported to appropriate person. 

Forms

Assessment Cover Sheet

UEENEEJ182A - Repair and service secondary 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

Feedback to student

 

 

 

 

 

 

 

 

Assessor name:

Signature:

Date:

Assessment Record Sheet

UEENEEJ182A - Repair and service secondary 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: