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Evidence Guide: UEERA0065 - Repair and service ammonia 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

 

UEERA0065 - Repair and service ammonia refrigeration systems

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

Prepare to service ammonia 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:

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

Completed
Date:

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

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

Completed
Date:

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

Completed
Date:

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

Completed
Date:

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Service and repair ammonia refrigeration system

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

Completed
Date:

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Refrigeration inspection and checks are carried out to ensure the system or component parts are isolated in accordance with WHS/OHS requirements and workplace procedures

Completed
Date:

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Refrigerant is removed from system safely in accordance with regulatory requirements, industry standards and practices

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

Completed
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Pressure testing is conducted at a pressure compatible with ammonia and in accordance with industry standards

Completed
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Refrigeration leaks are located and rectified using testing methods appropriate to the system and in accordance with industry standards and practices

Completed
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Oil is removed from an operational ammonia refrigeration system in accordance with industry standards and practices

Completed
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Refrigeration system is charged safely with ammonia and compatible lubricants in accordance with industry standards and practices

Completed
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Actual and specified range of operating conditions are determined from measured and calculated values as they apply to ammonia vapour compression and liquid recirculation systems in accordance with workplace procedures and industry standards

Completed
Date:

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Unplanned situations are dealt with safely in accordance with workplace procedures and with approval of an authorised person/s in a manner that minimises risk to personnel and equipment

Completed
Date:

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

Completed
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Complete and report servicing and repairing ammonia 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:

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

Completed
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Operation conditions are documented and include identification of any parameter that is not within the specified range for the system

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

Completed
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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 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

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 ammonia (R717) refrigerant at various locations in the vapour compression and liquid recirculation system

locating and rectifying leaks

recording measurements

selecting and using appropriate measuring devices correctly

servicing, pressure testing, charging/discharging refrigerant/lubricants and determining the operating conditions of ammonia vapour compression and liquid recirculation refrigeration system

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:

ammonia refrigeration systems and operating conditions, including:

cascade systems

direct expansion systems

flooded systems

liquid recirculation systems

multi-staged systems

revision of vapour compression cycle

single staged systems

types of ammonia systems

vapour compression systems

properties of ammonia

safe handling of ammonia

ammonia refrigeration system's major components, flow controls and ancillary components

relevant job safety assessments or risk mitigation processes hazards associated with ammonia refrigeration systems

relevant manufacturer specifications

relevant WHS/OHS legislated requirements

relevant workplace documentation, including service manuals and service documentation

relevant workplace policies and procedures, including workplace emergency response plan

servicing and repairing techniques for ammonia refrigeration systems, including:

adding refrigerant

leak detection methods

removing refrigerant.

servicing procedures.

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 ammonia refrigeration systems must include at least the following:

one ammonia refrigerant refrigeration system, including the following:

determining operating conditions using measurement and basic calculation methods:

suction and discharge pressures

ambient

evaporator and condensing temperatures

evaporator and condenser temperature differences

discharging/recovering refrigerant, replacing components, testing pressure, evacuating, charging and leak testing an ammonia refrigerant system in a safe and environmentally responsible manner