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Elements and Performance Criteria

1. Apply principles of Australian Standard 3666 or equivalent
   • Causes of corrosion, scale, algae and treatment/prevention can be explained.
   • Air distribution of cooling towers can be explained.
2. Assess reticulation system
   • Relevant water conditions are assessed against specifications using standard procedures and test equipment.
   • Condition of water circulation system is assessed and appropriate action determined.
   • Performance of regulating, filtering, conditioning/dosing and pumping systems is assessed against specification.
3. Measure relevant water properties
   • Test equipment is correctly used and applied.
   • Water properties are accurately determined/recorded.
4. Maintain reticulation/treatment systems
   • Water temperature control system is recorded and non-compliances are reported.
   • Dosing is adjusted to specification.
   • Faults are reported to appropriate personnel according to standard operating procedures.

Required Skills

Required skills

Look for evidence that confirms skills in planning and sequencing operations reading interpreting and following information on written job instructions specifications standard operating procedures charts lists drawings and other applicable reference documents checking and clarifying taskrelated information testing the condition of the water in the cooling towertreatment system testing dosing components for correct operationperformance testing water properties using appropriate techniques and equipment checking for conformance to specifications determining and recording test results adjusting dosing flow in the system to specification reporting system faults to appropriate personnel

Required knowledge

Look for evidence that confirms knowledge of causes of corrosion scale and algae methods of treatingpreventing occurrence of corrosion scale andor algae in water cooling towers and treatment systems the air flow patterns of cooling towers the testing requirements of AS andor other relevant regulations relating to water cooling towers precautions for preventing contamination of systems by legionella bacteria procedures for testing the condition of the water in the cooling tower specifications of the water condition variations of the test results from specification procedures to be followed when water condition varies from specification the correct operationperformance of the following system components regulators filters conditioners and pumps related to treatment systems performance tests for treatment system components water properties to be tested procedures for testing water properties test equipment and techniques water temperature specifications procedures for reporting system faults codes and regulations relevant to maintaining water treatment systems hazards and controls associated with maintaining water cooling towers and treatment systems including housekeeping safe work practices and procedures

Evidence Required

The evidence guide provides advice on assessment and must be read in conjunction with the performance criteria required skills and knowledge range statement and the Assessment Guidelines for the Training Package
Overview of assessment	A person who demonstrates competency in this unit must be able to maintain water cooling towers and treatment systems Competency in this unit cannot be claimed until all prerequisites have been satisfied
Critical aspects for assessment and evidence required to demonstrate competency in this unit	Assessors must be satisfied that the candidate can competently and consistently perform all elements of the unit as specified by the criteria including required knowledge and be capable of applying the competency in new and different situations and contexts
Context of and specific resources for assessment	This unit may be assessed on the job off the job or a combination of both on and off the job Where assessment occurs off the job that is the candidate is not in productive work then an appropriate simulation must be used where the range of conditions reflects realistic workplace situations The competencies covered by this unit would be demonstrated by an individual working alone or as part of a team The assessment environment should not disadvantage the candidate This unit could be assessed in conjunction with any other units addressing the safety quality communication materials handling recording and reporting associated with maintaining water cooling towers and treatment systems or other units requiring the exercise of the skills and knowledge covered by this unit
Method of assessment	Assessors should gather a range of evidence that is valid sufficient current and authentic Evidence can be gathered through a variety of ways including direct observation supervisors reports project work samples and questioning Questioning techniques should not require language literacy and numeracy skills beyond those required in this unit of competency The candidate must have access to all tools equipment materials and documentation required The candidate must be permitted to refer to any relevant workplace procedures product and manufacturing specifications codes standards manuals and reference materials
Guidance information for assessment

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Range Statement

The range statement relates to the unit of competency as a whole. It allows for different work environments and situations that may affect performance. Bold italicised wording, if used in the performance criteria, is detailed below. Essential operating conditions that may be present with training and assessment (depending on the work situation, needs of the candidate, accessibility of the item, and local industry and regional contexts) may also be included.
Relevant water conditions	Acidity Alkalinity Microbial Corrosion

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