SAQA

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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	4
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	4

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.

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