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: 

Commission and maintain transport refrigeration systems 
SAQA US ID UNIT STANDARD TITLE
9504  Commission and maintain transport refrigeration systems 
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  8 
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
116396  Commission and maintain transport refrigeration systems  Level 4  NQF Level 04  8   

PURPOSE OF THE UNIT STANDARD 
Commission and maintain a packaged refrigeration unit used to cool a truck designed to transport consumables at low temperature and ensure that the system will operate effectively and efficiently. 

LEARNING ASSUMED TO BE IN PLACE AND RECOGNITION OF PRIOR LEARNING 
  • A thorough understanding of the operation of the refrigeration system, its individual components and the control thereof.
  • Identify, use and maintain electrical testing tools used in the trade of refrigeration.
  • Use and maintain refrigeration trade service tools and instrumentation.
  • Explain function and operation of refrigeration plants, components, accessories and controls.
  • Find complex faults in a refrigeration installation.
  • Carry out service procedures on refrigeration plants.
  • Interpret electrical diagrams referring to refrigeration installations.
  • Interpret mechanical drawings referring to refrigeration plants.
  • Interpret operating and maintenance manuals. 
    		•

    UNIT STANDARD RANGE 
    Self propelled transport refrigeration systems, externally powered transport refrigeration systems and eutectic and multi compartment transport refrigeration systems. 

    Specific Outcomes and Assessment Criteria: 

    SPECIFIC OUTCOME 1 
    Plan the commissioning of a transport refrigeration system. 
    OUTCOME RANGE 
    . 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    1. Plans and schedules for the commissioning are drawn up in accordance with job specifications. 

    ASSESSMENT CRITERION 2 
    2. Work activities are planned to produce the required results within the available time. 

    ASSESSMENT CRITERION 3 
    3. The ability to determine resources required in terms of component, spares, people, finances, tools and instrumentation is demonstrated. 

    ASSESSMENT CRITERION 4 
    4. Operating parameters for the unit are obtained and verified. 

    ASSESSMENT CRITERION 5 
    5. Operating manuals for the units are obtained. 

    SPECIFIC OUTCOME 2 
    Organize the commissioning of a transport refrigeration system. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    1. Tools and instrumentation are checked and ensured to be functional and ready for use. 

    ASSESSMENT CRITERION 2 
    2. The ability to liaise with others and co-ordinate resources is demonstrated. 

    ASSESSMENT CRITERION 3 
    3. Work area is checked for hazards. All hazards are identified and corrective action is taken in line with worksite housekeeping procedures. 

    ASSESSMENT CRITERION 4 
    4. Support personnel is utilised in line with their expertise and instructions are given which promote good working relationship and ensure effective work. 

    SPECIFIC OUTCOME 3 
    Commission a transport refrigeration system. 
    OUTCOME RANGE 
    Calibrate and set all controls, identify, diagnose and remedy faults, start up system. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    1. Work is carried out in accordance with work place safety requirements. 

    ASSESSMENT CRITERION 2 
    2. Instrumentation and tools are used in accordance with manufacturer's instructions and correction factors are applied where necessary. 

    ASSESSMENT CRITERION 3 
    3. All controls are calibrated and adjusted in accordance with specified requirements. 

    ASSESSMENT CRITERION 4 
    4. Controls and control devices are checked to ensure that they are connected properly and operating in line with their intended use. 

    ASSESSMENT CRITERION 5 
    5. The airflow in the cooled area is checked and corrected if required. 

    ASSESSMENT CRITERION 6 
    6. The consequence of poor workmanship is described in terms of system effectiveness, operating costs and safety. 

    ASSESSMENT CRITERION 7 
    7. The nature, extent and cause of deviations in the operation of equipment and components are assessed and corrective action taken. 

    ASSESSMENT CRITERION 8 
    8. The site is cleaned, tools, consumables and instrumentation is stored in accordance with good housekeeping principles. 

    SPECIFIC OUTCOME 4 
    Observe and record all operating parameters. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    1. Accurate commissioning and equipment performance data are recorded. 

    ASSESSMENT CRITERION 2 
    2. Care is taken that the final operating parameters of the plant are within the specified limits. 

    ASSESSMENT CRITERION 3 
    3. Non-conformance of equipment performance with specifications is reported. 

    SPECIFIC OUTCOME 5 
    Complete commissioning documentation. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    1. A commissioning report is prepared in accordance with applicable specifications. 

    ASSESSMENT CRITERION 2 
    2. All observations and data are accurately reported. 

    ASSESSMENT CRITERION 3 
    3. Completion of commissioning and safety requirements is reported to designated personnel in line with company procedures. 

    SPECIFIC OUTCOME 6 
    Service a transport refrigeration system. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    1. System is checked for safe and effective operation. 

    ASSESSMENT CRITERION 2 
    2. All operating parameters are measured, recorded and checked against the operating manual or the normal operating parameters. 

    ASSESSMENT CRITERION 3 
    3. The operation of all operating and safety controls are checked, reset or calibrated. 

    ASSESSMENT CRITERION 4 
    4. The purpose and reason for automatic and manual reset switches is explained. 

    ASSESSMENT CRITERION 5 
    5. The compressor efficiency is checked. 

    ASSESSMENT CRITERION 6 
    6. The system is checked for non-condensables and moisture. 

    ASSESSMENT CRITERION 7 
    7. Any component or accessory requiring to be changed is changed without damage to the plant, the component, the accessory or undue loss of refrigerant. 

    ASSESSMENT CRITERION 8 
    8. Any component or accessory requiring to be cleaned is cleaned without damage to the plant, the component or the accessory. 

    ASSESSMENT CRITERION 9 
    9. No air, dirt or moisture is allowed to enter the system. 

    ASSESSMENT CRITERION 10 
    10. Possible reasons for non-standard performance are explained. 

    ASSESSMENT CRITERION 11 
    11. Results are recorded and reported according to worksite procedures. 

    ASSESSMENT CRITERION 12 
    12. Safe working practices, which ensure personal safety, are demonstrated. 

    ASSESSMENT CRITERION 13 
    13. Consequences of bad workmanship are listed and discussed. 

    SPECIFIC OUTCOME 7 
    Check and explain the purpose and operation of a defrost system. 
    OUTCOME RANGE 
    Electric and hot gas defrosts initiated by time, pressure or temperature. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    1. The purpose of defrosting and defrost control is explained. 

    ASSESSMENT CRITERION 2 
    2. The various methods of defrosting evaporator coils are stated and discussed 

    ASSESSMENT CRITERION 3 
    3. The equipment and controls required for the various systems, their position in the system are stated and their purpose is explained. 

    ASSESSMENT CRITERION 4 
    4. The settings for the controls are stated and reasons for these settings are given. 

    ASSESSMENT CRITERION 5 
    5. The operation of the defrost systems is checked against specifications or worksite standards. 

    ASSESSMENT CRITERION 6 
    6. Results are recorded and reported according to worksite procedures. 

    ASSESSMENT CRITERION 7 
    7. Safe working practices, which ensure personal safety, are demonstrated. 

    ASSESSMENT CRITERION 8 
    8. Consequences of faulty control settings are listed and explained. 

    SPECIFIC OUTCOME 8 
    Set a transport refrigeration system in operation. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    1. The system is correctly pressure and leak tested. 

    ASSESSMENT CRITERION 2 
    2. The system is correctly evacuated. 

    ASSESSMENT CRITERION 3 
    3. The system is correctly charged with oil and refrigerant. 

    ASSESSMENT CRITERION 4 
    4. The settings of all safety and operational controls are verified for operational performance as per system specifications. 

    ASSESSMENT CRITERION 5 
    5. The entire plant is checked for safe and effective operation. 

    ASSESSMENT CRITERION 6 
    6. All operating parameters are measured, recorded and checked against the operating instructions. 

    ASSESSMENT CRITERION 7 
    7. No damage occurred to plant, instruments or person. 

    ASSESSMENT CRITERION 8 
    8. The plant is started according to instructions or workplace procedures. 

    ASSESSMENT CRITERION 9 
    9. Plant performance is verified to be according to specifications. 

    ASSESSMENT CRITERION 10 
    10. Any follow-up action that may be required is arranged in accordance with workplace procedures. 

    ASSESSMENT CRITERION 11 
    11. Safe working practices, which ensure personal safety, are demonstrated. 

    ASSESSMENT CRITERION 12 
    12. Consequences of not carrying out all procedures are listed and discussed. 


    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 electric motors, contactors, relays and controls
    The purpose of technical information given in operating and maintenance manuals
    Consequences of sub-standard workmanship
    Work instructions and procedures. 


    Critical Cross-field Outcomes (CCFO): 

    UNIT STANDARD CCFO IDENTIFYING 
    Identify and solve problems
  • Nature and extent of deviation from specified performance is diagnosed and rectified.
  • Selecting the correct tools, instruments and type of refrigerant and oil.
  • Interpret technical drawings in order to obtain information required to solve problems and carry out tasks. 
    		•

    UNIT STANDARD CCFO WORKING 
    Work effectively with others
  • Give correct instructions to assistants. 
    		•

    UNIT STANDARD CCFO ORGANISING 
    Organize and manage myself and my activities
  • Select correct instrumentation and tools and use correctly 
    		•

    UNIT STANDARD CCFO COLLECTING 
    Collect, analyze, organize and critically evaluate information
  • Reading and interpreting manufacturer`s 
    		•

    UNIT STANDARD CCFO SCIENCE 
    Use science and technology effectively and critically
  • By understanding the processes involved. 
    		•

    UNIT STANDARD CCFO DEMONSTRATING 
    Demonstrate an understanding of the world as a set of related systems.
  • Be aware of the effect of leakage of refrigerant on the environment. 
    		•

    UNIT STANDARD NOTES 
    This unit standard has been replaced by unit standard 116396, which is "Commission and maintain transport refrigeration systems", Level 4, 8 credits.

    Company procedures, guidelines and operating, commissioning and maintenance instructions for the units to be commissioned and/or serviced shall be made available. 

    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.