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: 

List the commonly applied air-conditioning systems, state their application and explain their operation 
SAQA US ID UNIT STANDARD TITLE
9539  List the commonly applied air-conditioning systems, state their application and explain their 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 3  NQF Level 03  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
116710  List the commonly applied air-conditioning systems, state their application and explain their operation  Level 3  NQF Level 03  8   

PURPOSE OF THE UNIT STANDARD 
List the commonly applied air-conditioning systems, explain their application and operation and identify and explain the operation of the control devices and control systems required. 

LEARNING ASSUMED TO BE IN PLACE AND RECOGNITION OF PRIOR LEARNING 
Explain the operation of the vapour compression refrigeration system. Identify water-piping systems. Explain the properties of air. 

UNIT STANDARD RANGE 
Air-conditioning systems:
All air, air-water and refrigerant systems as applied to packaged equipment, constant volume (including full outside air systems), constant volume with terminal reheat, variable airflow (VAV) systems including economy cycle.

Controls (including electronic controls):
Thermostats, temperature sensors and controllers, humidistats, pressure sensors, overheating stats, pressure switches, flow switches.

Control systems:
Temperature, pressure and humidity control systems for air, chilled water and condenser water systems. 

Specific Outcomes and Assessment Criteria: 

SPECIFIC OUTCOME 1 
Define air-conditioning, list the commonly applied air-conditioning systems and discuss. 
OUTCOME NOTES 
Define air-conditioning, list the commonly applied air-conditioning systems and discuss their typical applications. 

ASSESSMENT CRITERIA 

ASSESSMENT CRITERION 1 
1. Air-conditioning is defined correctly. 

ASSESSMENT CRITERION 2 
2. The commonly applied air-conditioning systems are named and their typical applications are discussed. 
ASSESSMENT CRITERION RANGE 
Unitary and split units, packaged and field assembled systems.
 

ASSESSMENT CRITERION 3 
3. The typical applications of the various air-conditioning systems are discussed and their advantages and disadvantages are listed and explained. 

SPECIFIC OUTCOME 2 
Explain the operation of the commonly applied air-conditioning systems. 

ASSESSMENT CRITERIA 

ASSESSMENT CRITERION 1 
1. The principles of operation of the commonly applied air-conditioning systems are explained. 

ASSESSMENT CRITERION 2 
2. The types of temperature, humidity and pressure controls required are listed and their purpose is explained. 

ASSESSMENT CRITERION 3 
3. The types of safety controls required are listed and their purpose is explained. 

ASSESSMENT CRITERION 4 
4. The positions where the controls must be installed are indicated and discussed. 

ASSESSMENT CRITERION 5 
5. The consequences of installing the controls in wrong positions are named and discussed. 

SPECIFIC OUTCOME 3 
Identify and explain the operation of the controls associated with air-conditioning systems. 

ASSESSMENT CRITERIA 

ASSESSMENT CRITERION 1 
1. Each control device is identified correctly. 

ASSESSMENT CRITERION 2 
2. The principles of operation of each control device are explained. 

ASSESSMENT CRITERION 3 
3. Reasons for possible malfunction of the control devices are named and discussed. 
ASSESSMENT CRITERION RANGE 
Wrong application, faulty position, and influences from other sources, faulty or wrong sensors.
 

SPECIFIC OUTCOME 4 
State the operational control systems required for the various air-conditioning systems. 
OUTCOME NOTES 
State the operational control systems required for the various air-conditioning systems and explain their operation. 

ASSESSMENT CRITERIA 

ASSESSMENT CRITERION 1 
1. The type of operational control system required for the various air-conditioning systems is stated correctly. 
ASSESSMENT CRITERION RANGE 
Temperature, humidity or pressure controls or a combination of these.
 

ASSESSMENT CRITERION 2 
2. The positions where the operational control sensors are to be placed are indicated correctly. 

ASSESSMENT CRITERION 3 
3. The operation of each operational control system is explained. 

ASSESSMENT CRITERION 4 
4. The parameters to be considered to determine the operational control settings are stated and explained. 

ASSESSMENT CRITERION 5 
5. The consequences of faulty settings on operating controls are stated and explained. 

SPECIFIC OUTCOME 5 
State the safety control systems required for the various air-conditioning systems. 
OUTCOME NOTES 
State the safety control systems required for the various air-conditioning systems and explain their operation. 

ASSESSMENT CRITERIA 

ASSESSMENT CRITERION 1 
1. The safety controls required are stated correctly and their purpose is explained. 
ASSESSMENT CRITERION RANGE 
Interlocks, overheating controls, pressure and flow switches, delay and run-out timers.
 

ASSESSMENT CRITERION 2 
2. The operation of each safety control system is explained. 

ASSESSMENT CRITERION 3 
3. The parameters to be considered to determine the safety control settings are stated and explained. 

ASSESSMENT CRITERION 4 
4. The consequences of faulty settings on safety controls are stated 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 reason for and benefits of air-conditioning and the various methods of providing the environmental conditions and control parameters required. 


Critical Cross-field Outcomes (CCFO): 

UNIT STANDARD CCFO IDENTIFYING 
Identify and solve problems
  • Identify the correct control devices and control systems.
  • State the correct applications of air-conditioning systems. 
    		•

    UNIT STANDARD CCFO COLLECTING 
    Collect, analyse, organize and critically evaluate information
  • State correct reasons for using particular air-conditioning systems and their controls. 
    		•

    UNIT STANDARD CCFO SCIENCE 
    Use science and technology effectively and critically
  • Appropriate use of control devices.
  • Correct application of air-conditioning and control systems. 
    		•

    UNIT STANDARD NOTES 
    This unit standard has been replaced by unit standard 116710, which is "List the commonly applied air-conditioning systems, state their application and explain their operation", Level 3, 8 credits.

    Only knowledge of the purpose and operation of the controls is required. The learner does not require knowledge to design an air-conditioning system and the controls required. 

    QUALIFICATIONS UTILISING THIS UNIT STANDARD: 
      ID QUALIFICATION TITLE PRE-2009 NQF LEVEL NQF LEVEL STATUS END DATE PRIMARY OR DELEGATED QA FUNCTIONARY
    Core  20720   National Certificate: Air-Conditioning, Refrigeration and Ventilation  Level 3  NQF Level 03  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.