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

Interpret electrical power & control circuit diagrams and fault find and repair electrical circuits related to air-conditioning, refrigeration and ventilation installations 
SAQA US ID UNIT STANDARD TITLE
9508  Interpret electrical power & control circuit diagrams and fault find and repair electrical circuits related to air-conditioning, refrigeration and ventilation installations 
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  11 
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 does not replace any other unit standard and is not replaced by any other unit standard. 

PURPOSE OF THE UNIT STANDARD 
Fault-find and repair with the aid of electrical diagrams, electrical circuits related to air-conditioning, refrigeration and installations. 

LEARNING ASSUMED TO BE IN PLACE AND RECOGNITION OF PRIOR LEARNING 
  • Use of tools and measuring instruments.
  • Identify electrical cables and components.
  • Explain the operation of the vapour compression refrigeration system.
  • Interpret plant layout and component drawings. 
    		•

    UNIT STANDARD RANGE 
    Single and three phase air-conditioning, refrigeration and ventilation installations with up to 6 loads and 10 safety or operating controls, with transformers and rectifiers and components operating on D.C. Voltage. 

    Specific Outcomes and Assessment Criteria: 

    SPECIFIC OUTCOME 1 
    Identify all types of contacts on the diagrams. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    1. Contacts are all identified correctly first time, in accordance with the IEC contact identification code. 
    ASSESSMENT CRITERION NOTES 
    5.1 Sequence of operation is correctly explained first time in accordance with:
    5.2 the grid system
    5.3 the component identification codes.
    5.4 the contact identification codes. 
    ASSESSMENT CRITERION RANGE 
    Normally open, Normally closed and timed contacts, etc.
     

    SPECIFIC OUTCOME 2 
    Identify all the components on the diagrams. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    1. Components are all identified correctly first time, in accordance with the IEC component identification code. 

    SPECIFIC OUTCOME 3 
    Locate all the contacts of specific relays throughout the drawing. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    1. Contacts are all located correctly first time, in accordance with the IEC grid system identification code. 

    SPECIFIC OUTCOME 4 
    Distinguish power circuit from control circuit diagrams. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    1. Circuit diagrams are correctly identified as power circuit or control circuit in accordance with IEC standard. 

    SPECIFIC OUTCOME 5 
    Describe the sequence of operation of the relays/contactors and all components. 
    OUTCOME NOTES 
    Describe the sequence of operation of the relays/contactors and all components, starting from any given point on the drawing. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    1. Sequence of operation is correctly explained in accordance with: The grid system, the component identification codes and the contact identification codes 

    SPECIFIC OUTCOME 6 
    Diagnose electrical faults. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    1. Electrical faults are diagnosed using tools/instruments and knowledge of the principles of operation of the electrical components used in the machine. 

    ASSESSMENT CRITERION 2 
    2. A systematic, structured process of elimination is used to locate faults. 

    ASSESSMENT CRITERION 3 
    3. No good components are discarded or damaged in the process. 

    SPECIFIC OUTCOME 7 
    Replace any and all faulty components. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    1. Components of any nature found to be faulty are replaced with suitable, correctly functioning ones, using techniques or procedures approved by the manufacturer and good electrical and mechanical practice. 

    SPECIFIC OUTCOME 8 
    Test repairs carried out. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    1. Repairs carried out are tested against the manufacturer's original specification and performance standard for the machine. 


    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 
    Principles of operation of single and 3-phase motors, contactors and relays timing relays, phase monitoring relays and test instruments. The I.E.C. standards for layout and referencing on drawings. 


    Critical Cross-field Outcomes (CCFO): 

    UNIT STANDARD CCFO IDENTIFYING 
    Identify and solve problems
  • Identify possible malfunctions
  • Determine positions where to take readings 
    		•

    UNIT STANDARD CCFO ORGANISING 
    Organise and manage myself and my activities
  • Prepare, plan and select information from diagram 
    		•

    UNIT STANDARD CCFO COLLECTING 
    Collect, analyse, organise and critically evaluate information
  • Interpreting electrical diagrams 
    		•

    UNIT STANDARD CCFO SCIENCE 
    Use science and technology effectively and critically
  • Use tools, interpretation of results and actions taken 
    		•

    UNIT STANDARD CCFO DEMONSTRATING 
    Demonstrate an understanding of the world as a set of related systems
  • Understanding the hazards associated with electricity 
    		•

    UNIT STANDARD CCFO CONTRIBUTING 
    Learner and societal development
  • Understanding the use of electricity in air-conditioning, refrigeration and ventilation systems 
    		•

    UNIT STANDARD NOTES 
    All work to be done and all questions answered within a reasonable time. A set of circuit diagrams complying with I.E.C. standards must be available. A selection of replacement parts must be available. 

    QUALIFICATIONS UTILISING THIS UNIT STANDARD: 
      ID QUALIFICATION TITLE PRE-2009 NQF LEVEL NQF LEVEL STATUS END DATE PRIMARY OR DELEGATED QA FUNCTIONARY
    Core  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.