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

Determine, define and evaluate operating parameters of a refrigeration system 
SAQA US ID UNIT STANDARD TITLE
116699  Determine, define and evaluate operating parameters of a refrigeration system 
ORIGINATOR
SGB Air-conditioning Refrigeration and Ventilation 
PRIMARY OR DELEGATED QUALITY ASSURANCE FUNCTIONARY
-  
FIELD SUBFIELD
Field 06 - Manufacturing, Engineering and Technology Manufacturing and Assembly 
ABET BAND UNIT STANDARD TYPE PRE-2009 NQF LEVEL NQF LEVEL CREDITS
Undefined  Regular  Level 3  NQF Level 03  5 
REGISTRATION STATUS REGISTRATION START DATE REGISTRATION END DATE SAQA DECISION NUMBER
Passed the End Date -
Status was "Reregistered" 		 2018-07-01  2023-06-30  SAQA 06120/18 
LAST DATE FOR ENROLMENT LAST DATE FOR ACHIEVEMENT
2024-06-30   2027-06-30  

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 replaces: 
US ID Unit Standard Title Pre-2009 NQF Level NQF Level Credits Replacement Status
9397  Determine, define and evaluate operating parameters of a refrigeration system and transfer refrigerant  Level 3  NQF Level 03  5   

PURPOSE OF THE UNIT STANDARD 
Determine, define and evaluate the operating parameters of simple vapour compression refrigeration systems without undue release of refrigerant into the atmosphere. 

LEARNING ASSUMED TO BE IN PLACE AND RECOGNITION OF PRIOR LEARNING 
  • Explain the operation of actual vapour compression refrigeration systems and the function of system components and accessories.
  • Use refrigeration, air-conditioning and ventilation trade tools and instruments. 
    		•

    UNIT STANDARD RANGE 
    Operating parameters:
  • Compressor suction and discharge pressures, Evaporator and condenser temperatures and pressures, Superheat, sub-cooling, entering and leaving air and water temperatures, room temperatures (dry and wet bulb) and relative humidities.
    Normally expected operating parameters:
  • Evaporator superheat and condenser sub-cooling - 5 to 8 K .
  • Evaporator TD - 6 to 12 K .
    (These depend on the design operating parameters of the plant.
    Accuracies required:
  • Temperatures ± 0,5 K .
  • Superheat/sub-cooling - ± 1 K .
  • Pressures - ± 10 kPa .
  • Vacuum - ± 5 kPa .
    Terms:
  • Temperature, Saturation temperature, superheat, sub-cooling, relative humidity, absolute pressure, gauge pressure and vacuum. 
    		•

    Specific Outcomes and Assessment Criteria: 

    SPECIFIC OUTCOME 1 
    Measure or determine and define the operating parameters of refrigeration systems. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    The gauge manifold is connected correctly and hoses are purged. 

    ASSESSMENT CRITERION 2 
    Refrigerant and water pressures are read correctly, recorded and named. 

    ASSESSMENT CRITERION 3 
    Refrigerant, water, air and surface temperatures are measured, read correctly, recorded and named. 

    ASSESSMENT CRITERION 4 
    The relative humidity of the room air is measured correctly and recorded. 

    ASSESSMENT CRITERION 5 
    Superheat and sub cooling of the refrigerant at various positions are determined correctly. 

    ASSESSMENT CRITERION 6 
    All measurements are obtained safely, correctly and without damage to plant or instrumentation. 

    ASSESSMENT CRITERION 7 
    No excessive amount of refrigerant is released to atmosphere. 

    ASSESSMENT CRITERION 8 
    All operating parameters are defined and correct SI units and symbols are used. 

    ASSESSMENT CRITERION 9 
    The consequences of not or incorrectly determining the operating parameters are listed and explained. 

    SPECIFIC OUTCOME 2 
    Compare the observations with the design parameters for the plant or with normally expected operating parameters. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    Superheat and sub cooling deviations are noted, discussed and explained. 

    ASSESSMENT CRITERION 2 
    The desirability of superheat and sub cooling is explained. 

    ASSESSMENT CRITERION 3 
    The possible effects of high, low or no superheating or sub cooling are explained. 

    ASSESSMENT CRITERION 4 
    Reasons for high or low temperature or pressure readings are explained. 

    ASSESSMENT CRITERION 5 
    Effects of high or low room temperature and/or relative humidity are explained. 

    SPECIFIC OUTCOME 3 
    Operate the valves in a typical refrigeration system. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    Service valves are correctly back-seated, front-seated or cracked when requested. 

    ASSESSMENT CRITERION 2 
    Refrigerant and water valves are opened or closed when requested. 

    ASSESSMENT CRITERION 3 
    Components or accessories are correctly isolated when requested. 

    ASSESSMENT CRITERION 4 
    No damage occurred to valves, plant or tools. 

    ASSESSMENT CRITERION 5 
    No excessive amount of refrigerant is released to atmosphere. 

    ASSESSMENT CRITERION 6 
    The consequences of valves in wrong positions (open vs. closed etc.) are listed and explained. 

    SPECIFIC OUTCOME 4 
    Explain commonly used terms for operating parameters of refrigeration systems. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    The terms are explained correctly. 
    ASSESSMENT CRITERION RANGE 
    Temperature (including saturation temperature and temperature difference), heat, relative humidity, pressure, vacuum, superheat, sub-cooling.
     

    ASSESSMENT CRITERION 2 
    The correct SI units and symbols are stated and used. 


    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 
  • Understand the operation of a refrigeration system and the purpose of all components and accessories.
  • The importance of accuracy when measuring plant-operating parameters
  • The importance of transferring refrigerant without undue waste into atmosphere 
    		•

    UNIT STANDARD DEVELOPMENTAL OUTCOME 
    N/A 

    UNIT STANDARD LINKAGES 
    N/A 


    Critical Cross-field Outcomes (CCFO): 

    UNIT STANDARD CCFO IDENTIFYING 
    Identify and solve problems
  • Determine positions where to take readings
  • Identify components and accessories. 
    		•

    UNIT STANDARD CCFO WORKING 
    Work effectively with others
  • Reporting results to superiors 
    		•

    UNIT STANDARD CCFO COLLECTING 
    Collect, analyse, organise and critically evaluate information
  • Collect operating parameters and explain their significance 
    		•

    UNIT STANDARD CCFO SCIENCE 
    Use science and technology effectively and critically
  • Use tools and instruments correctly 
    		•

    UNIT STANDARD CCFO DEMONSTRATING 
    Demonstrate an understanding of the world as a set of related systems
  • Understand the effect of releasing refrigerant into the atmosphere 
    		•

    UNIT STANDARD ASSESSOR CRITERIA 
    N/A 

    REREGISTRATION HISTORY 
    As per the SAQA Board decision/s at that time, this unit standard was Reregistered in 2012; 2015. 

    UNIT STANDARD NOTES 
    This unit standard replaces unit standard 9397, which is "Determine, define and evaluate operating parameters of a refrigeration system and transfer refrigerant", Level 3, 5 credits. 

    QUALIFICATIONS UTILISING THIS UNIT STANDARD: 
      ID QUALIFICATION TITLE PRE-2009 NQF LEVEL NQF LEVEL STATUS END DATE PRIMARY OR DELEGATED QA FUNCTIONARY
    Core  48963   National Certificate: Air-Conditioning, Refrigeration and Ventilation  Level 3  NQF Level 03  Passed the End Date -
    Status was "Reregistered"     		 2009-03-12  Was MERSETA until Last Date for Achievement 
    Core  65509   Further Education and Training Certificate: Air-conditioning, Refrigeration and Ventilation  Level 4  NQF Level 04  Passed the End Date -
    Status was "Reregistered"     		 2023-06-30  MERSETA 


    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.