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

Explain the need for water treatment and the methods and equipment used 
SAQA US ID UNIT STANDARD TITLE
9523  Explain the need for water treatment and the methods and equipment used 
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 
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
116377  Explain the need for water treatment and the methods and equipment used  Level 4  NQF Level 04  Complete 

PURPOSE OF THE UNIT STANDARD 
Explain the need for water treatment and the methods and equipment used. 

LEARNING ASSUMED TO BE IN PLACE AND RECOGNITION OF PRIOR LEARNING 
It is assumed that people starting to learn towards this unit standard are already able to communicate effectively with others.
Operate water treatment system used in air-conditioning and refrigeration installations.
Explain the operation of the vapour compression refrigeration cycle.
List commonly applied air-conditioning systems, state their application and explain their operation. 

UNIT STANDARD RANGE 
Water treatment methods, which have been in use and have scientific/physical evidence (not anecdotal) of their effectiveness over specific time periods or more than one air-conditioning or refrigeration system

The methods employed shall include an overview of the equipment and consumables needed for hot water, condenser water and chilled water circuits. 

Specific Outcomes and Assessment Criteria: 

SPECIFIC OUTCOME 1 
Explain the long-term effects untreated water has on chilled water circuits. 
OUTCOME NOTES 
Explain the long-term effects untreated water has on chilled water circuits and the consequent effect on the refrigeration plant and heat exchangers. 

ASSESSMENT CRITERIA
 

ASSESSMENT CRITERION 1 
1. The effects described are consistent with any combination of physical evidence, photographs, and chemical analyses and log sheets. 

SPECIFIC OUTCOME 2 
Explain the long-term effects untreated water has on condenser water circuits. 
OUTCOME NOTES 
Explain the long-term effects untreated water has on condenser water circuits and the consequent effect on the refrigeration plant and cooling tower. 

ASSESSMENT CRITERIA
 

ASSESSMENT CRITERION 1 
1. The effects described are consistent with any combination of physical evidence, photographs, and chemical analyses and log sheets. 

SPECIFIC OUTCOME 3 
Explain the long-term effects untreated water has on hot water circuits. 
OUTCOME NOTES 
Explain the long-term effects untreated water has on hot water circuits and the consequent effect on heat recovery refrigeration plants, hot water generators and heat exchangers. 

ASSESSMENT CRITERIA
 

ASSESSMENT CRITERION 1 
1. The effects described are consistent with any combination of physical evidence, photographs, and chemical analyses and log sheets. 

SPECIFIC OUTCOME 4 
Explain the long-term effects untreated spray water has on closed circuit water coolers. 
OUTCOME NOTES 
Explain the long-term effects untreated spray water has on closed circuit water coolers or on evaporative condensers and the consequent effect on the refrigeration plant. 

ASSESSMENT CRITERIA
 

ASSESSMENT CRITERION 1 
1. The effects described are consistent with any combination of physical evidence, photographs, and chemical analyses and log sheets. 

SPECIFIC OUTCOME 5 
Describe what methods are available to counteract the adverse effects that untreated water has. 
OUTCOME NOTES 
Describe what methods are available to counteract the adverse effects that untreated water has on the various water circuits, and the advantages and disadvantages of each method. 

ASSESSMENT CRITERIA
 

ASSESSMENT CRITERION 1 
1. The advantages of using one method over another, in each water circuit, are explained using criteria including cost, effectiveness, convenience, safety and environmental impact, and is provable using evidence gathered during use. 

ASSESSMENT CRITERION 2 
2. The permanent devices and consumables necessary for each method are described as to their role in the effectiveness of the method, as well as to their effect on people and the environment. 

ASSESSMENT CRITERION 3 
3. The consequences to each water circuit of a break in the treatment routine are explained for each method in terms of the speed of deterioration of the condition of the water and the period of time required to restore it to an acceptable condition. 


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 need to use provable evidence/records of the effectiveness, first cost, operating cost, safety, ease of use and the environmental impact of all water treatment methods on each type of water circuit. 


Critical Cross-field Outcomes (CCFO): 

UNIT STANDARD CCFO COLLECTING 
Collect, analyse, organise and critically evaluate information
  • Interpretation of manufacturer`s catalogues 

  • UNIT STANDARD CCFO COMMUNICATING 
    Communicate effectively
  • Explain the need for water treatment 

  • UNIT STANDARD CCFO SCIENCE 
    Use science and technology effectively and critically
  • Understanding the processes involved 

  • UNIT STANDARD CCFO DEMONSTRATING 
    Demonstrate an understanding of the world as a set of related systems.
  • Understanding the effect of corrosion on water piping 

  • UNIT STANDARD NOTES 
    This unit standard has been replaced by unit standard 116377, which is "Explain the need for water treatment and the methods and equipment used", Level 4, 4 credits.

    Questions are answered and explanations given within a reasonable time. 

    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.