Application

This unit of competency defines the skills and knowledge required to perform the selection, maintenance, repair/replacement and adjustment of refrigerant flow controls, either liquid or vapour (mechanical or electronic types) to achieve desired operational performance.

The associated equipment includes controllers and/or valves required to ensure proper operation of the flow device.

Where the interpretation of technical drawings is required unit MEM09002 Interpret technical drawing should also be selected.

Where rectification, modification involving electrical disconnection and reconnection is required unit MEM18049 Disconnect/reconnect fixed wired equipment up to 1000 volts a.c./1500 volts d.c. should also be selected.

A Refrigerant Handling Licence must be held by any person who carries out work in relation to refrigeration and air conditioning equipment.

What You'll Learn

Assessment Requirements

Performance Evidence

Evidence required to demonstrate competence in this unit must be relevant to and satisfy the requirements of the elements and performance criteria on at least two (2) occasions and include:

following work instructions, standard operating procedures (SOPs) and safe work practices

identifying and interpreting charts, lists, catalogues, specifications and relevant legislation with respect to maintaining, repairing/replacing and adjusting refrigerant flow controls and associated equipment

selecting and using appropriate tools, techniques and test equipment necessary to inspect, test and assess the operational function of the flow control valves and components for correct operation and conformance against specifications

removing the refrigerant from the system and containing in accordance with procedures and regulatory requirements

identifying and localising faulty components and confirming malfunction by inspection/testing, and making required adjustments to achieve specifications

removing/dismantling and reassembling faulty components and selecting replacement parts from manufacturers’ catalogues to meet the required specifications

undertaking calculations and numerical operations associated with maintaining, repairing/replacing and adjusting refrigerant flow controls and associated equipment

evacuating the system and recharging with refrigerant, and leak testing system and adjusting flow control to manufacturers’ specifications in accordance with refrigerant principles and procedures

undertaking performance check to meet specifications

completing all maintenance records/reports in accordance with SOPs.

Knowledge Evidence

Evidence required to demonstrate the required knowledge for this unit must be relevant to and satisfy the requirements of the elements and performance criteria and include knowledge of:

safe work practices and procedures and use of personal protective equipment (PPE)

operation of refrigerant flow controls, including:

Thermal Expansion Valve (TEV)

internal equalised

external equalised

direct operating

servo operated

pilot operated

Maximum Operating Pressures (MOP), cross charged, gas charged, capillary tube, thermo electric, electronic TEV and controllers, low side floats, high side floats, distributors, reversing valves, solenoid valves, non-return valves, evaporator pressure regulators (EPR) valves, crankcase pressure regulating (CPR) refrigeration valves, condenser bypass valves, liquid level controllers, AX valves and hand expansion valves

measuring instruments/equipment, specifications and procedures for checking temperature(s)

measuring instruments/equipment, specifications and procedures for checking components

tools, equipment, techniques and procedures for performing preventative maintenance and sequence of implementation

procedures for identifying refrigerant type and safely removing the refrigerant and charging the system including all legislative and regulatory requirements

tools, equipment, techniques and procedures for dismantling, repairing, reassembling and testing components

process for selecting replacement parts

specifications, operational characteristics and process for identifying system components

procedures for reporting non-conformances and completing maintenance records/service reports.

Assessment Conditions

Assessors must:

have vocational competency in maintaining, repairing/replacing and adjusting refrigerant flow controls and associated equipment at least to the level being assessed with relevant industry knowledge and experience

satisfy the assessor requirements in the Standards for Registered Training Organisations 2015 or its replacement and comply with the National Vocational Education and Training Regulator Act 2011, its replacement or equivalent legislation covering VET regulation in a non-referring state/territory as the case requires

Where possible assessment must occur in operational workplace situations. Where this is not possible or where personal safety or environmental damage are limiting factors, assessment must occur in a sufficiently rigorous simulated environment that reflects realistic operational workplace conditions. This must cover all aspects of workplace performance, including environment, task skills, task management skills, contingency management skills and job role environment skills

Conditions for assessment must include access to all tools, equipment, materials and documentation required, including relevant workplace procedures, product and manufacturing specifications

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.

Foundation Skills

• text: This section describes those required skills (reading, writing, oral communication and numeracy) that are essential to workplace performance in this unit of competency. Foundation skills essential to performance are explicit in the performance criteria of this unit of competency.

Prerequisite Units

• {'code': 'MEM05006', 'title': 'Perform brazing and/or silver soldering'}
• {'code': 'MEM10010', 'title': 'Install pipework and pipework assemblies'}
• {'code': 'MEM11011', 'title': 'Undertake manual handling'}
• {'code': 'MEM12023', 'title': 'Perform engineering measurements'}
• {'code': 'MEM12024', 'title': 'Perform computations'}
• {'code': 'MEM13015', 'title': 'Work safely and effectively in manufacturing and engineering'}
• {'code': 'MEM14006', 'title': 'Plan work activities'}
• {'code': 'MEM16006', 'title': 'Organise and communicate information'}
• {'code': 'MEM18001', 'title': 'Use hand tools'}
• {'code': 'MEM18002', 'title': 'Use power tools/hand held operations'}
• {'code': 'MEM18055', 'title': 'Dismantle, replace and assemble engineering components'}
• {'code': 'MEM18086', 'title': 'Test, recover, evacuate and charge refrigeration systems'}

Parent Qualifications

• MEM40119 — Certificate IV in Engineering
  MEM

Related Units

• MEM05063 — Write and proof robotic welding system programs
  Same training package
• MEM05096 — Weld using flux core arc welding process
  Same training package
• MEM21011 — Service calendar and other dial indication mechanisms for watches
  Same training package
• MEM07014 — Perform electro-discharge machining (EDM) operations
  Same training package
• MEM18051 — Fault find and repair/rectify complex electrical circuits
  Same training package
• MEM20025 — Gain entry
  Same training package