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 refrigeration systems 
SAQA US ID UNIT STANDARD TITLE
9517  Commission 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
116415  Commission refrigeration systems  Level 4  NQF Level 04  8   

PURPOSE OF THE UNIT STANDARD 
Commission and put into operation of a refrigeration plant. 

LEARNING ASSUMED TO BE IN PLACE AND RECOGNITION OF PRIOR LEARNING 
Understanding of the operation of refrigeration plants, their individual components and the control thereof:
  • Use and maintain refrigeration trade service tools and instrumentation.
  • Interpret mechanical drawings and sketches referring to refrigeration plants.
  • Interpret electrical power and control circuit diagrams relevant to air-conditioning and refrigeration equipment.
  • Service a refrigeration system and set it in operation.
  • Diagnose operational faults in refrigeration systems and take remedial action or propose corrective action.
  • Explain function and operation of refrigeration circuits as applied to air-conditioning or refrigeration systems and select and explain the function of components, accessories and controls. 
    		•

    UNIT STANDARD RANGE 
    Plants incorporating different types of compressors (Reciprocating, centrifugal, screw, rotary)

    Direct expansion, liquid overfeed plant.

    Single and multi-stage plants. 

    Specific Outcomes and Assessment Criteria: 

    SPECIFIC OUTCOME 1 
    Plan and organise the commissioning of the refrigeration plant. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    1. Plans and schedules for the commissioning are drawn up in accordance with project 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. Tools and instrumentation are checked and ensured to be functional and ready for use. 

    ASSESSMENT CRITERION 5 
    5. The ability to liaise with others and co-ordinate resources is demonstrated. 

    ASSESSMENT CRITERION 6 
    6. Work area is checked for hazards. All hazards are identified and corrective action is taken in line with worksite housekeeping procedures. 

    ASSESSMENT CRITERION 7 
    7. Support personnel are utilized in line with their expertise and instructions are given which promote good working relationship and ensure effective work. 

    ASSESSMENT CRITERION 8 
    8. Consequences of non-or part commissioning systems are listed and discussed. 

    SPECIFIC OUTCOME 2 
    Carry out pre-start up checks. 

    ASSESSMENT CRITERIA     

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

    ASSESSMENT CRITERION 2 
    2. System is evacuated to specify level, to remove moisture and foreign gases. 

    ASSESSMENT CRITERION 3 
    3. Instrumentation and tools are used in accordance with manufacturer's instructions and correction factors are applied where necessary. 

    ASSESSMENT CRITERION 4 
    4. All electrical and pneumatic controls are tested, calibrated and adjusted in accordance with specified requirements. 

    ASSESSMENT CRITERION 5 
    5. Controls and control devices are checked to ensure that they are connected properly and operating in line with their intended use. 

    ASSESSMENT CRITERION 6 
    6. Electrical systems are checked in compliance with performance and safety requirements. 

    SPECIFIC OUTCOME 3 
    Charge plant and confirm operation of systems. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    1. Plant is charged with specified refrigerant in accordance with specifications. 

    ASSESSMENT CRITERION 2 
    2. Systems are test-run, checked and adjusted to meet performance requirements. 

    ASSESSMENT CRITERION 3 
    3. Controls are verified to ensure performance in accordance with specified requirements. 

    ASSESSMENT CRITERION 4 
    4. Direction of motor and pump rotation is checked and ratings verified. 

    ASSESSMENT CRITERION 5 
    5. Vibration levels of rotary equipment are confirmed to be within specified limits. 

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

    SPECIFIC OUTCOME 4 
    Check and verify operation of plant. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    1. Refrigerant flow and oil levels are adjusted to performance requirements. 

    ASSESSMENT CRITERION 2 
    2. Performance tests are carried out and data is recorded as required by specified commissioning procedures. 
    ASSESSMENT CRITERION RANGE 
    Suction, discharge and liquid temperatures and pressures, superheat, refrigerant and water flow rates, refrigerant levels in receiver and surge drum, temperature of product and room air, humidity, motor current and voltages.
     

    ASSESSMENT CRITERION 3 
    3. The nature, extent and cause of deviations in the operation of equipment and components are assessed and corrective action taken. 

    ASSESSMENT CRITERION 4 
    4. Care is taken that the final operating parameters of the plant are within the specified limits. 

    ASSESSMENT CRITERION 5 
    5. Non-conformance of equipment performance with specifications is reported. 

    ASSESSMENT CRITERION 6 
    6. The work is carried out within agreed time frames. 

    ASSESSMENT CRITERION 7 
    7. Consequences of non-conformance of equipment performance are listed and discussed. 

    SPECIFIC OUTCOME 5 
    Hand over plant and 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 and correctly reported. 

    ASSESSMENT CRITERION 3 
    3. The site is cleaned, tools, consumables and instrumentation is stored in accordance with good housekeeping principles. 

    ASSESSMENT CRITERION 4 
    4. Completion of commissioning and safety requirements is reported to designated personnel in line with company procedures. 

    ASSESSMENT CRITERION 5 
    5. Manuals and operating instructions are finalized. 

    ASSESSMENT CRITERION 6 
    6. Operating personnel is trained in accordance with operating instructions. 

    ASSESSMENT CRITERION 7 
    7. Equipment and/or plant are handed over to user. 

    ASSESSMENT CRITERION 8 
    8. Job cards are completed in accordance with company guidelines. 


    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 
  • The application and operation of refrigeration plant, components and accessories
  • Performance characteristics of components of plant.
  • Detecting unacceptable noise, smell or temperature of equipment.
  • Diagnosing non-conformance or under-performance of equipment, its causes and remedial actions to be taken.
  • Operating and manufacturer`s instructions regarding components and plant.
  • Interaction between various components of plant on effective operation of system. 
    		•


    Critical Cross-field Outcomes (CCFO): 

    UNIT STANDARD CCFO IDENTIFYING 
    Identify and solve problems
  • Diagnosing nature and extent of deviations from specified performance and rectifying same 
    		•

    UNIT STANDARD CCFO WORKING 
    Work effectively with others
  • Working as a member of a commissioning team 
    		•

    UNIT STANDARD CCFO ORGANISING 
    Organise and manage myself and my activities responsibly and effectively
  • Preparing, planning and selecting resources (people, tools, instrumentation, material, finances) to carry out commissioning 
    		•

    UNIT STANDARD CCFO COMMUNICATING 
    Communicate effectively
  • Presenting oral or written reports. Training of operating personnel 
    		•

    UNIT STANDARD CCFO SCIENCE 
    Use science and technology effectively and critically
  • Using instrumentation. Interpreting results and taking appropriate action. Calibrating of equipment 
    		•

    UNIT STANDARD CCFO DEMONSTRATING 
    Demonstrate an understanding of the world as a set of related systems
  • Describing the consequences of sub-standard commissioning work on plant operation and operating cost 
    		•

    UNIT STANDARD CCFO CONTRIBUTING 
    Learner and societal development
  • Knowledge of operation of refrigeration system 
    		•

    UNIT STANDARD NOTES 
    This unit standard has been replaced by unit standard 116415, which is "Commission refrigeration systems", Level 4, 8 credits.

    Specific requirements are contained in one or more of the following documents:
  • Manufacturer`s commissioning instructions of various components.
  • Company procedures and guidelines regarding commissioning of refrigeration plant. 
    		•

    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.