Assessor Resource

MEM18084A
Commission and decommission split air conditioning systems

Assessment tool

Version 1.0
Issue Date: May 2024


It includes the application of safe working practices, following standard procedures to pressure test, evacuate, recover, charge and perform functional checks to test system performance.

This unit refers to plug in appliances only. For hard wired installations a licensed electrical tradesperson must undertake connection and disconnection.

Band: A

Unit Weight: 4

This unit covers commissioning and decommissioning of split air conditioning systems to relevant standards, codes and local regulations.

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

Prerequisites

Path 1

MEM09002B

Interpret technical drawing

MEM12023A

Perform engineering measurements

MEM18001C

Use hand tools

MEM18002B

Use power tools/hand held operations

MEM18055B

Dismantle, replace and assemble engineering components

Employability Skills

This unit contains employability skills.



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.

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 install split air conditioning systems to manufacturer 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 on and off the job. Where assessment occurs off the job, that is the candidate is not in productive work, then 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 commissioning, recommissioning and decommissioning split air conditioning systems or domestic air conditioning and refrigeration appliances and 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, supervisor 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

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.

Required skills

Look for evidence that confirms skills in:

reading, interpreting and following information on written job instructions, specifications, standard operating procedures, charts, catalogues, lists, drawings and other applicable reference documents

effective communication with appropriate persons

planning and sequencing operations

checking and clarifying task related information

using tools, techniques and equipment necessary to check for correct operation

comparing system and component performance/ operation against specification

identifying faulty components and non-compliances

using appropriate test equipment to identify non-compliance

safely removing, containing and adding refrigerant to relevant Australian Standards or codes and regulations

making required adjustments to achieve specifications

applying safety procedures, standard operating procedures and legislative requirements to all work undertaken

completing relevant commissioning and decommissioning documentation

Required knowledge

Look for evidence that confirms knowledge of:

applicable legislative and regulatory requirements, standards, codes, licensing requirements and sustainable environmental practices for commissioning and decommissioning systems

applicable procedures and legislative requirements for storage, handling and treatment of ozone depleting and synthetic greenhouse gas refrigerant

procedures to determine the actual and specified range of operating conditions from measured and calculated values as they apply to particular vapour compression systems

typical work environments, demands and considerations

specifications, operational characteristics and process for identifying system components

typical problems, contingencies and solutions

applicable tools, equipment and testing devices and their operation

procedures for evacuating system

procedures for leak testing

procedures for adding refrigerant

requirements and procedures to isolate circuits/appliances

procedures for checking air flow

measuring instruments/equipment, specifications and procedures for checking temperature and system performance

measuring instruments/equipment, specifications and procedures for checking components

procedures for reporting non-conformances

process for identifying refrigerant type

types of commissiong documentation

requirements and procedures for completing documentation

OHS procedures and risk control measures

hazards and risk control measures associated with commissioning split and domestic air conditioning systems

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.

Tools, equipment and testing devices

Refrigeration gauge manifold, Schraeder access valves; quick connect couplings, thermometer/thermocouple temperature measuring devices; analogue and digital vacuum measuring gauges; digital scales; refrigerant recovery unit; vacuum pump; electronic leak detectors, refrigerant containers/cylinders

Legislative and industry requirements

Commonwealth, State and Territory legislation, regulations, standards and industry codes of practice

The Ozone Protection and Synthetic Greenhouse Gas Legislation Amendment Bill 2003; Air conditioning residential best practice guidelines (AIRAH); State and local building regulations

Sustainable environmental practices for commissioning and decommissioning split air conditioning and domestic refrigeration.

System performance

Pressure; temperature; sub cooling; superheating; evaporator coil to air temperature difference

Residential split air conditioning systems

Single head split systems up to 18kw cooling capacity

Domestic refrigeration and air conditioning systems

Domestic refrigeration and air conditioning systems being self contained 240 volt plug in self contained appliances primarily used in domestic/residential situations

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
Established procedures are used to determine the actual and specified range of operating conditions from measured and calculated values as they apply to particular vapour compression systems. 
Established OHS procedures and risk control measures for carrying out the work are followed. 
Operating conditions are established and recorded on commissioning documentation. 
Tools, equipment and testing devices needed to determine the basic operating conditions are obtained and checked for correct operation and safety 
The system is checked and isolated where necessary, in strict accordance OHS requirements and procedures 
Circuits/appliances are isolated where necessary in strict accordance OHS requirements and procedures. 
Refrigerants are removed safely into suitably labelled containers in accordance with legislative and industry requirements. 
Contaminated refrigerant is dealt with in accordance with legislative and industry requirements. 
Safety hazards are identified and noted and established risk control measures are implemented. 
Industry codes of practice and manufacturer installation instructions are followed. 
Precautions are taken to prevent damage to components while pressure testing the system. 
Pressure testing is conducted at a pressure compatible with the refrigerant to be used. 
Leaks are located, isolated and repaired using methods appropriate to the system type under test and in accordance with industry practices. 
Safety hazards which have not previously been identified are noted, and established risk control measures are implemented. 
The system is evacuated to the required level and cleaned the system of all moisture and other containments in accordance with legislative and industry requirements. 
A standing vacuum test is applied in accordance with industry codes of practice and applicable standards. 
Correct refrigerant is selected for the system, in accordance with manufacturer requirements and industry practices. 
The refrigerant charge is measured by weight in accordance with manufacturer specifications. 
The system is charged correctly in accordance with manufacturer requirements and industry practices. 
All components are checked and maintained in accordance with manufacturer requirements. 
The system is started and operated in accordance with manufacturer instructions 
Standard tests are carried out to confirm system performance to manufacturer specifications. 
The refrigerant charge is checked and refrigerant added if required. 
The system is leak checked in accordance with refrigeration procedures and practices. 
Test data is recorded as required. 
The worksite is cleaned and left in presentable condition in accordance with original presentation, client requirements, industry standards and organisational requirements. 
Final inspections are undertaken to ensure installation conforms with industry, legislative and work order requirements. 
The client is instructed on the use of the product in accordance with organisational requirements and manufacturer specifications. 
Certificates of compliance and other relevant commissioning documentation are completed and processed in accordance with State regulatory requirements. 
Plug in appliance is electrically disconnected or arrangements made for appropriately licensed person to isolate hard-wired appliances 
Refrigerants are recovered, stored and disposed of in accordance with legislative and industry requirements. 
Units and components are removed and disposed of safely and in accordance with regulations, industry codes of practice and sustainable environmental practices. 
The worksite is cleaned and left in presentable condition, client and organisational requirements, industry standards and sustainable environmental practices. 
Decommissioning documentation is completed and processed in accordance with State regulatory requirements. 

Forms

Assessment Cover Sheet

MEM18084A - Commission and decommission split air conditioning 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

MEM18084A - Commission and decommission split air conditioning 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: