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: 

Service a refrigeration system and set it in operation 
SAQA US ID UNIT STANDARD TITLE
9509  Service a refrigeration system and set it in operation 
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
116403  Service a refrigeration system and set it in operation  Level 4  NQF Level 04  8   

PURPOSE OF THE UNIT STANDARD 
Carry out complex procedures used in servicing, maintaining and starting up of refrigeration systems. Determine if a refrigeration system is suitable for charging with refrigerant and operating. 

LEARNING ASSUMED TO BE IN PLACE AND RECOGNITION OF PRIOR LEARNING 
Explain the operation of actual vapour compression refrigeration systems and the function of the components and accessories.

Use refrigeration, air-conditioning and ventilation trade instruments.

Ability to carry out elementary service procedures on refrigeration plants. 

UNIT STANDARD RANGE 
Pressure testing, leak testing, charging, setting plants in operation and stopping plants.
Checking and topping up the refrigerant charge and the oil charge, recovering refrigerant.
Explain the purpose of and set, adjust, calibrate and check the operation of high pressure, low pressure and oil pressure switches as well as evaporator and crankcase pressure regulators and defrost controls
State and explain the reasons for and methods of defrost control.
Changing serviceable and non-serviceable filter-driers and burnout kits.
Compressor efficiency testing.
Testing for non-condensables and moisture in systems. Testing thermostatic expansion valves.
All the above for plants incorporating capillary tubes and thermostatic expansion valves. 

Specific Outcomes and Assessment Criteria: 

SPECIFIC OUTCOME 1 
Service a 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 compressor efficiency is checked. 

ASSESSMENT CRITERION 5 
5. The system is checked for non-condensables and moisture. 

ASSESSMENT CRITERION 6 
6. Any component or accessory requiring to be changed is changed without damage to the plant, the component and the accessory or undue loss of refrigerant. 

ASSESSMENT CRITERION 7 
7. Any component or accessory requiring to be cleaned is cleaned without damage to the plant, the component or the accessory. 

ASSESSMENT CRITERION 8 
8. No air, dirt or moisture is allowed to enter the system. 

ASSESSMENT CRITERION 9 
9. Possible reasons for non-standard performance are explained. 

ASSESSMENT CRITERION 10 
10. Results are recorded and reported according to worksite procedures. 

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

SPECIFIC OUTCOME 2 
Bench-set pressure switches. 
OUTCOME RANGE 
High pressure, low pressure, oil pressure and condensing pressure control switches to be set according to worksite procedures. 

ASSESSMENT CRITERIA 

ASSESSMENT CRITERION 1 
1. Pressure switches are correctly selected. 

ASSESSMENT CRITERION 2 
2. The purpose and reason for automatic and manual reset switches is explained. 

ASSESSMENT CRITERION 3 
3. The cut-in and cutout pressures for cold and freezer room temperature control are correctly determined and set. 

ASSESSMENT CRITERION 4 
4. The cutout pressures for high pressure and low pressure and oil pressure switches are correctly determined and set. 

ASSESSMENT CRITERION 5 
5. The operation and method of checking the oil pressure switch is explained. 

ASSESSMENT CRITERION 6 
6. The cut-in and cutout pressures for condenser fan control switches are correctly determined and set. 

ASSESSMENT CRITERION 7 
7. All operations are carried out safely and without damage to equipment, tools or persons. 

ASSESSMENT CRITERION 8 
8. The consequences of faulty settings are listed and explained. 

SPECIFIC OUTCOME 3 
Check and explain the purpose and operation of a defrost system. 
OUTCOME RANGE 
Electric and hot gas defrost 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 settings on the controls are listed and explained. 

SPECIFIC OUTCOME 4 
Set a 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 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 checks are listed and explained. 


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 necessity of following the correct procedures for carrying out service procedures on refrigeration plants to ensure effective, long and trouble free operation. 


Critical Cross-field Outcomes (CCFO): 

UNIT STANDARD CCFO IDENTIFYING 
Identify and solve problems
  • Determine positions where to take readings
  • Select components and measuring instruments 
    		•

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

    UNIT STANDARD CCFO COMMUNICATING 
    Communicate effectively
  • Reporting results to superiors 
    		•

    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 NOTES 
    This unit standard has been replaced by unit standard 116403, which is "Service a refrigeration system and set it in operation", Level 4, 8 credits.

    "Workplace procedures" refers to documented procedures for the worksite.
    Assessment should take place in real situations, where practical.

    The following reference material may be useful in the completion of this unit standard:
  • The OHS act.
  • The SAIRAC Guide for the safe handling of refrigerants. 
    		•

    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.