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SOUTH AFRICAN QUALIFICATIONS AUTHORITY 
REGISTERED UNIT STANDARD THAT HAS PASSED THE END DATE: 

Diagnose operational faults in refrigeration systems and take remedial action or propose corrective action 
SAQA US ID UNIT STANDARD TITLE
9511  Diagnose operational faults in refrigeration systems and take remedial action or propose corrective action 
ORIGINATOR
SGB Air-conditioning Refrigeration and Ventilation 
PRIMARY OR DELEGATED QUALITY ASSURANCE FUNCTIONARY
-  
FIELD SUBFIELD
Field 06 - Manufacturing, Engineering and Technology Engineering and Related Design 
ABET BAND UNIT STANDARD TYPE PRE-2009 NQF LEVEL NQF LEVEL CREDITS
Undefined  Regular  Level 4  NQF Level 04  6 
REGISTRATION STATUS REGISTRATION START DATE REGISTRATION END DATE SAQA DECISION NUMBER
Passed the End Date -
Status was "Registered" 		 2001-06-13  2004-06-13  SAQA 0836/01 
LAST DATE FOR ENROLMENT LAST DATE FOR ACHIEVEMENT
2005-06-13   2008-06-13  

In all of the tables in this document, both the pre-2009 NQF Level and the NQF Level is shown. In the text (purpose statements, qualification rules, etc), any references to NQF Levels are to the pre-2009 levels unless specifically stated otherwise.  

This unit standard is replaced by: 
US ID Unit Standard Title Pre-2009 NQF Level NQF Level Credits Replacement Status
116406  Diagnose operational faults in refrigeration systems and take remedial action or propose corrective action  Level 4  NQF Level 04  6   

PURPOSE OF THE UNIT STANDARD 
Diagnose and explain complex operational faults experienced in refrigeration installations, rectify these and/or propose corrective action to be taken. 

LEARNING ASSUMED TO BE IN PLACE AND RECOGNITION OF PRIOR LEARNING 
It is assumed that people starting to learn towards this unit standard have already proven competence in:
  • Identifying, using and maintaining refrigeration trade tools.
  • Explaining the operation of actual vapour compression refrigeration systems.
  • Identifying and explaining the operation of refrigerant control devices.
  • Identifying refrigeration plant operation and safety devices.
  • Identifying, using and maintaining electrical testing tools used in the trade of refrigeration.
  • Interpret electrical diagrams. 
    		•

    UNIT STANDARD RANGE 
    Plant under-performance due to control or component malfunction or maladjustment (e.g. broken or leaking valve, condensing pressure control set wrong, etc.)

    Including reasons for and corrective action to be taken for non-standard operating conditions (e.g. too high or too low suction pressure, head pressure, oil pressure, superheat or sub-cooling, freeze-ups, compressor burn-outs, loosing oil, etc. 

    Specific Outcomes and Assessment Criteria: 

    SPECIFIC OUTCOME 1 
    Establish the extent of the problem. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    1. The purpose of faultfinding is explained. 

    ASSESSMENT CRITERION 2 
    2. The various types of operational faults are stated and explained, and their interaction identified. 
    ASSESSMENT CRITERION RANGE 
    Design, mechanical, electrical, operational faults.
     

    ASSESSMENT CRITERION 3 
    3. The effect of these faults on the operation of components and systems are listed and discussed. 

    ASSESSMENT CRITERION 4 
    4. A general description of the complaint by the operator and/or owner of the plant is obtained. 

    SPECIFIC OUTCOME 2 
    Diagnose the problem. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    1. All operating parameters are observed and recorded. 

    ASSESSMENT CRITERION 2 
    2. All components are examined in a logical and systematic sequence for any evidence of malfunction. 

    ASSESSMENT CRITERION 3 
    3. The impact of making quick decisions and temporary fixes is explained in terms of costs and goodwill. 

    ASSESSMENT CRITERION 4 
    4. Possible causes of the fault are identified using sensory skills. 
    ASSESSMENT CRITERION RANGE 
    Odours, heat, noise.
     

    ASSESSMENT CRITERION 5 
    5. Possible causes of the fault are diagnosed from a description given by operators, owners or users. 

    ASSESSMENT CRITERION 6 
    6. The impact of control or component malfunction or maladjustment on plant performance is explained. 

    SPECIFIC OUTCOME 3 
    Demonstrate the use of trouble shooting procedures. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    1. The use of trouble shooting procedures, tables and charts from suppliers is demonstrated. 

    ASSESSMENT CRITERION 2 
    2. The problem or complaint is explained in terms of possible causes and symptoms. 

    ASSESSMENT CRITERION 3 
    3. Symptoms are analysed and remedial action taken. 

    ASSESSMENT CRITERION 4 
    4. Reasons for corrective action to be taken to rectify non-standard operating conditions are listed and explained. 

    SPECIFIC OUTCOME 4 
    Faults are corrected if possible. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    1. The fault diagnosed is corrected. 

    ASSESSMENT CRITERION 2 
    2. The result of the correction is checked and found suitable. 

    ASSESSMENT CRITERION 3 
    3. Suitable remedial action for correcting the fault is proposed. 

    SPECIFIC OUTCOME 5 
    Correct faults or propose remedial action. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    1. The system is re-started correctly. 

    ASSESSMENT CRITERION 2 
    2. All operating parameters are checked and recorded. 

    ASSESSMENT CRITERION 3 
    3. Operating parameters are compared with original parameters to evaluate improvement. 


    UNIT STANDARD ACCREDITATION AND MODERATION OPTIONS 
    Any person wishing to be assessed against this unit standard may apply to an assessment agency, assessor or provider institution accredited by the relevant ETQA, who may appoint a moderator to be present at the assessment.

    The assessor must have knowledge and experience of air-conditioning or refrigeration. 

    UNIT STANDARD ESSENTIAL EMBEDDED KNOWLEDGE 
    Purpose of fault diagnosing
    Identify malfunctioning of equipment by detecting unacceptable noise, odour or temperature of equipment.
    Diagnosing non-performance of equipment and controls, causes and remedial actions.
    Trouble shooting procedures as per specifications
    Regulations, legislation, agreements, policies, standards
    Operating and manufacturer`s instructions re components and controls
    Interaction between various components of plant on effective operation of system 


    Critical Cross-field Outcomes (CCFO): 

    UNIT STANDARD CCFO IDENTIFYING 
    Identify and solve problems
  • Nature and extent of deviations form specified performance is diagnosed and rectified 
    		•

    UNIT STANDARD CCFO WORKING 
    Work effectively with others
  • Work as member of commissioning and/or service team 
    		•

    UNIT STANDARD CCFO ORGANISING 
    Organize and manage myself and my activities responsibly and effectively
  • Prepare, plan and select resources (people, tools, material, finances) for trouble shooting 
    		•

    UNIT STANDARD CCFO COMMUNICATING 
    Communicate effectively
  • Present oral and written reports 
    		•

    UNIT STANDARD CCFO SCIENCE 
    Use science and technology effectively and critically
  • Use instrumentation. Interpretation of results and action taken 
    		•

    UNIT STANDARD NOTES 
    This unit standard has been replaced by unit standard 116406, which is "Diagnose operational faults in refrigeration systems and take remedial action or propose corrective action", Level 4, 6 credits.

    Specific requirements are contained in one or more of the following documents:
  • Manufacturer`s instructions regarding the operation of equipment and controls.
  • Company procedures and guidelines.
  • Supplier`s trouble analysis charts and tables.
  • Operating and maintenance manuals. 
    		•

    QUALIFICATIONS UTILISING THIS UNIT STANDARD: 
      ID QUALIFICATION TITLE PRE-2009 NQF LEVEL NQF LEVEL STATUS END DATE PRIMARY OR DELEGATED QA FUNCTIONARY
    Elective  20721   National Certificate: Air Conditioning, Refrigeration and Ventilation  Level 4  NQF Level 04  Passed the End Date -
    Status was "Registered"     		 2004-06-13  Was MERSETA until Last Date for Achievement 


    PROVIDERS CURRENTLY ACCREDITED TO OFFER THIS UNIT STANDARD: 
    This information shows the current accreditations (i.e. those not past their accreditation end dates), and is the most complete record available to SAQA as of today. Some Primary or Delegated Quality Assurance Functionaries have a lag in their recording systems for provider accreditation, in turn leading to a lag in notifying SAQA of all the providers that they have accredited to offer qualifications and unit standards, as well as any extensions to accreditation end dates. The relevant Primary or Delegated Quality Assurance Functionary should be notified if a record appears to be missing from here.
     
    NONE 


    All qualifications and part qualifications registered on the National Qualifications Framework are public property. Thus the only payment that can be made for them is for service and reproduction. It is illegal to sell this material for profit. If the material is reproduced or quoted, the South African Qualifications Authority (SAQA) should be acknowledged as the source.