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Evidence Guide: UEERA0032 - Diagnose and rectify faults in complex air conditioning/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

 

UEERA0032 - Diagnose and rectify faults in complex air conditioning/refrigeration systems

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

Prepare to diagnose and rectify faults

  1. WHS/OHS requirements and procedures are identified, obtained and implemented
WHS/OHS requirements and procedures are identified, obtained and implemented

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

WHS/OHS risk control measures and procedures are followed in preparation for work

Completed
Date:

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Hazards are monitored and any not previously identified are documented and risk control measures implemented in consultation with relevant person/s

Completed
Date:

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The extent of faults are determined from reports/documentation and discussions with relevant person/s

Completed
Date:

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Relevant person/s is consulted to ensure work is coordinated with others on the worksite

Completed
Date:

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Tools, equipment and testing devices required to diagnose faults are obtained and checked for correct operation and safety in accordance with workplace procedures

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Diagnose and rectify faults

  1. WHS/OHS risk control measures and workplace procedures for carrying out the work are followed
WHS/OHS risk control measures and workplace procedures for carrying out the work are followed

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Need to test or measure live work is determined in accordance with workplace procedures and WHS/OHS requirements

Completed
Date:

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Circuits/machines/plant are checked as being isolated, where necessary, in accordance with workplace procedures and WHS/OHS requirements

Completed
Date:

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Logical diagnostic methods, measurements and estimations are applied to diagnose complex refrigeration/air conditioning system faults in accordance with system operational parameters and requirements

Completed
Date:

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Suspected fault sources are tested to confirm if they are the source of system problems

Completed
Date:

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Fault causes are identified and appropriately competent person/s engaged to rectify the fault where it is outside the scope of the refrigeration and air conditioning system

Completed
Date:

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Faults in system components are rectified to return refrigeration/air conditioning system to its operational standard

Completed
Date:

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System is tested to verify that the system operates as intended and to specified requirements and industry standards

Completed
Date:

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Methods for resolving unexpected situations are discussed, as required, with appropriate person/s in accordance with job specifications and requirements

Completed
Date:

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Methods for resolving unexpected situations are selected on the basis of safety and specified work outcomes

Completed
Date:

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Diagnosis and rectification activities are conducted without waste of materials, damage to apparatus, the surrounding environment and/or services using sustainable energy practices

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Complete and report fault diagnosis and rectification activities

  1. WHS/OHS work completion risk control measures and procedures are followed
WHS/OHS work completion risk control measures and procedures are followed

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Worksite is made safe in accordance with workplace safety procedures

Completed
Date:

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Fault diagnosis and rectification activities are documented in accordance with workplace procedures

Completed
Date:

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Appropriate person/s is notified that system faults have been rectified in accordance with workplace procedures

Completed
Date:

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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 one occasion and include:

applying logical diagnostic methods

using fault scenarios to test the cause of system faults

identifying faults and competency needed to rectify them

rectifying faults in system controls

verifying that the system operates correctly

dealing with unplanned events

applying relevant legislations, industry standards, codes of practice and regulations

applying relevant work health and safety (WHS)/occupational health and safety (WHS/OHS) requirements, including:

applying safe working practices

hazard identification and reporting

implementing risk control measures

completing and reporting fault diagnosis and rectification activities

determining need to test or measure live work

isolating circuits/machines/plant

using relevant tools, equipment and testing devices.

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:

complex refrigeration and air conditioning system fault finding and repair, safe working practices and relevant standards, codes and regulations, including:

fault-finding techniques including:

factors to consider in clarifying the nature of a fault:

initial fault report

confirmation of symptoms of the fault

comparison of symptoms with normal operation

effect to cause reasoning — assumptions of possible causes

methods for testing assumptions encompassing:

visual inspection

sectional testing

split-half tests

component isolation

dealing with intermittent faults

causes of intermittent faults are vibration, shock, changes in temperature and electromagnetic interference

refrigeration system analysis, including:

pressure enthalpy definitions:

high pressure and low-pressure refrigerants

triple point of new refrigerants

glide of trinary blends

differential evaporation of refrigerant blends

variable refrigerant volume

refrigeration cycle, including:

expansion process

vaporising process

compression process

condensing process

compression ratio

enthalpy processes, including:

co-efficient of performance

effect of suction temperature on cycle efficiency

effect of condensing temperature on cycle efficiency

actual refrigerating cycles, including:

design operating conditions

effects of superheating suction vapour

superheating without useful cooling

superheating that produces useful cooling

superheating in suction piping outside the refrigerated space

superheating the vapour inside the refrigerated space

effects of subcooling the liquid

effects liquid - suction heat exchangers

effects of pressure losses resulting from friction

refrigeration cycle faults, including:

symptoms and causes

measurements and fault confirmation tests

air conditioning system analysis, including:

psychrometric chart, including:

properties, definitions and units

plotting conditions:

RA, SA, OA and MA

psychometric processes, including:

heating

cooling only

cooling and dehumidification

cooling, dehumidification and reheat

design operating conditions, including:

indoor and outdoor wet and dry bulb temperatures

volume flow rate supply, return and outdoor air

air conditioning system faults, including:

symptoms and causes

measurements and fault confirmation tests

power and control system analysis, including:

power and control circuit diagrams

sequence of operation

manufacturers diagrams, specifications and instructions

power and control circuit faults:

symptoms and causes

measurements and fault confirmation tests

relevant measurements and estimations

relevant risk mitigation processes

relevant WHS/OHS legislated requirements, including:

environmental and sustainable energy principles and practices

safe working practices

relevant workplace policies and procedures

relevant workplace documentation.

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.

Diagnosing and rectifying faults must include at least four faults in the following complex refrigeration/air conditioning systems:

multiple major components (i.e. compressors, condenser or evaporators)

circuits or systems and associated components and controls