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Evidence Guide: UEERA0066 - Repair and service carbon dioxide refrigeration systems

Student: __________________________________________________

Signature: _________________________________________________

Tips for gathering evidence to demonstrate your skills

The important thing to remember when gathering evidence is that the more evidence the better - that is, the more evidence you gather to demonstrate your skills, the more confident an assessor can be that you have learned the skills not just at one point in time, but are continuing to apply and develop those skills (as opposed to just learning for the test!). Furthermore, one piece of evidence that you collect will not usualy demonstrate all the required criteria for a unit of competency, whereas multiple overlapping pieces of evidence will usually do the trick!

From the Wiki University

 

UEERA0066 - Repair and service carbon dioxide refrigeration systems

What evidence can you provide to prove your understanding of each of the following citeria?

Prepare to service CO² refrigeration system

  1. WHS/OHS hazards, risk control methods, relevant standards, codes and legislation are obtained and applied
WHS/OHS hazards, risk control methods, relevant standards, codes and legislation are obtained and applied

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Safety hazards not previously identified are assessed, reported and advice on risk control measures sought from work supervisor

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Nature of refrigeration work is obtained from documentation or from work supervisor to determine the scope of refrigeration work to be undertaken

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Advice is sought from work supervisor to ensure refrigeration work is coordinated effectively with others

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Sources of materials required for the work are accessed in accordance with workplace and procedures

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Tools, equipment and testing devices needed to carry out refrigeration work are obtained and checked for correct operation and safety

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Service and repair CO² refrigeration system

  1. Measuring refrigeration system operating parameters is conducted in accordance with WHS/OHS requirements and workplace safety procedures
Measuring refrigeration system operating parameters is conducted in accordance with WHS/OHS requirements and workplace safety procedures

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Inspection and checks are carried out to ensure the refrigeration system or component parts are isolated in accordance with WHS/OHS requirements, industry standards and practices

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Refrigerant is removed from refrigeration system safely in accordance with WHS/OHS requirements, industry standards and practices

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Precautions are taken to prevent damage to components while pressure testing refrigeration system

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Pressure testing is conducted at a pressure compatible with CO² and in accordance with WHS/OHS requirements, industry standards and practices

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Leaks are located and rectified using testing methods appropriate to the refrigeration system and in accordance with industry standards and practices

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Refrigeration system is evacuated to the required level and cleaned of moisture and other contaminants in accordance with industry standards and practices

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Refrigeration system is charged safely with refrigerant grade CO² and compatible lubricants in accordance with industry standards and practices

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Actual and specified range of operating conditions are determined from measured and calculated values as they apply to sub-critical CO² vapour compression and liquid recirculation/cascade systems in accordance with workplace procedures

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Unplanned situations are responded to and discussed with appropriate person/s and documented in accordance with workplace procedures in a manner that minimises risk to personnel and equipment

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Refrigeration operating conditions are determined without damage to apparatus, circuits, the surrounding environment or services using sustainable energy practices

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Complete work and report on servicing CO² refrigeration system

  1. Worksite is cleaned and made safe in accordance with workplace procedures
Worksite is cleaned and made safe in accordance with workplace procedures

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Contaminated refrigerant and lubricant are dealt with in accordance with legislative/regulatory requirements

Completed
Date:

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Operation conditions are documented and include identification of any parameters that are not within the specified range for the refrigeration system

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Work supervisor is notified of the completion of work in accordance with established procedures

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Assessed

Teacher: ___________________________________ Date: _________

Signature: ________________________________________________

Comments:

 

 

 

 

 

 

 

 

Instructions to Assessors

Required Skills and Knowledge

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 legislative, industry standards and practices

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

completing work and reporting on servicing and repairing sub-critical carbon dioxide (CO²) refrigeration systems

conducting work observing the relevant legislation, regulations, polices and workplace procedures

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

decontaminating and evacuating the system

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

documenting operating conditions correctly

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

locating and rectifying leaks

preparing to service and repair CO² refrigeration systems

pressure testing, charging/discharging refrigerant/lubricants and determining the operating conditions of CO² vapour compression and volatile secondary (liquid recirculation) system

recording measurements

selecting and using appropriate measuring devices correctly

servicing and repairing CO² refrigeration systems

using calculation methods accurately.

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:

CO² refrigeration systems, including:

basic CO² refrigeration system

basic liquid recirculation /cascade system employing CO² refrigerant at sub-critical condition

benefits of using CO² as a refrigerant

thermophysical properties

operating conditions of CO² refrigeration systems, including:

applicable standards and codes

CO² refrigeration compressors and lubricants

system components, construction and operation

servicing and repair techniques for CO² refrigeration systems, including:

moisture problems with CO² systems

refrigerant conditions

refrigerant cylinders and regulators

service gauges

service procedures

system standing pressure as a result of power loss.

Range Statement

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.

Servicing and repairing CO² refrigeration systems must include at least the following:

charging and discharging a CO² system with refrigerant and lubricant in a safe and environmentally responsible manner, excluding self-contained systems

determining:

suction and discharge pressures

ambient, evaporator and condensing temperatures

evaporator and condenser temperature difference

critical point, triple point, trans-critical and sub-critical refrigerant conditions