MEM18096A Maintain, repair/replace and adjust

MEM18096A Maintain, repair/replace and adjust
MEM18096A Maintain, repair/replace and
adjust refrigerant flow controls and
associated equipment
Release: 2
MEM18096A Maintain, repair/replace and adjust refrigerant flow controls and associated equipment Date this document was generated: 6
October 2012
MEM18096A Maintain, repair/replace and adjust refrigerant flow controls
and associated equipment
Modification History
Prerequisite unit MEM05006B updated to MEM05006C
Unit Descriptor
Unit descriptor
This unit covers performing the selection, maintenance,
repair/replacement and adjustment of refrigerant flow
controls, either liquid or vapour (mechanical or electronic
types) to achieve desired operational performance.
Application of the Unit
Application of the unit
The selection, maintenance, repair, replacement and
adjustment of refrigerant flow controls are conducted
according to refrigeration principles and practices.
Adjustments are made to manufacturers' specifications.
All work is conducted according to safety regulations and
Australian standards and codes.
The associate equipment may include controllers and/or
valves required to ensure proper operation of the flow
device.
Where any rectification, modification involves electrical
disconnection and reconnection, then Unit MEM18049C
(Disconnect/reconnect fixed wired equipment up to 1000
volts a.c./1500 volts d.c.) should also be considered.
Band: A
Unit Weight: 6
Licensing/Regulatory Information
Not Applicable
Approved
© Commonwealth of Australia, 2012
Page 2 of 9
Manufacturing Skills Australia
MEM18096A Maintain, repair/replace and adjust refrigerant flow controls and associated equipment Date this document was generated: 6
October 2012
Pre-Requisites
Prerequisite units
Path 1
MEM05006C
Perform brazing and/or silver
soldering
MEM10010B
Install pipework and pipework
assemblies
MEM12023A
Perform engineering measurements
MEM18001C
Use hand tools
MEM18002B
Use power tools/hand held
operations
MEM18055B
Dismantle, replace and assemble
engineering components
MEM18086B
Test, recover, evacuate and charge
refrigeration systems
Employability Skills Information
Employability skills
This unit contains employability skills.
Elements and Performance Criteria Pre-Content
Elements describe the
essential outcomes of a
unit of competency.
Approved
© Commonwealth of Australia, 2012
Performance criteria describe the performance needed to
demonstrate achievement of the element. Where bold
italicised text is used, further information is detailed in the
required skills and knowledge section and the range
statement. Assessment of performance is to be consistent
with the evidence guide.
Page 3 of 9
Manufacturing Skills Australia
MEM18096A Maintain, repair/replace and adjust refrigerant flow controls and associated equipment Date this document was generated: 6
October 2012
Elements and Performance Criteria
ELEMENT
PERFORMANCE CRITERIA
1. Undertake
preventative
maintenance checks
on refrigerant flow
controls
1.1.The location and operation of the control is
understood.
1.2.The operational parameters of the refrigerant control
are understood.
1.3.Visual inspection and testing with appropriate test
equipment is carried out by following refrigeration
principles, procedures and safety requirements.
1.4.The refrigerant type is correctly identified.
2. Undertake fault
finding on refrigerant
flow controls
2.1.Flow control is identified correctly.
2.2.The characteristics of the flow control are
understood.
2.3.The operational function of the flow control and
associated valves are inspected and tested.
2.4.Appropriate test equipment can be selected/used
safely.
2.5.Correct operation of the flow control is assessed
against specification.
3. Repair or replace
refrigerant flow
control
3.1.Using manufacturers' catalogues and specifications,
appropriate flow control or components relevant to
system operation are selected for replacement/repair.
3.2.The refrigerant is removed/contained safely from the
system in accordance with refrigeration principles
and procedures and relevant standards and codes.
3.3.Faulty components are dismantled and repaired
/replaced to manufactures' specifications as required.
3.4.Replacement parts are selected from manufactures
catalogues according to required specifications.
4. Return to service
refrigerant flow
control
4.1.System is evacuated and recharged with refrigerant
safely, in accordance with refrigeration principles
and procedures and relevant standards and codes.
4.2.System is leak tested in accordance with
refrigeration principles/procedures and relevant
standards and codes.
4.3.Flow control is adjusted to manufactures'
specifications in accordance with refrigeration
principles and procedures and relevant standards and
codes.
4.4.Performance check is undertaken in accordance with
refrigeration principles and procedures and relevant
standards and codes.
4.5.Maintenance records service reports are completed
by appropriate designated means.
Approved
© Commonwealth of Australia, 2012
Page 4 of 9
Manufacturing Skills Australia
MEM18096A Maintain, repair/replace and adjust refrigerant flow controls and associated equipment Date this document was generated: 6
October 2012
Required Skills and Knowledge
REQUIRED SKILLS AND KNOWLEDGE
This section describes the skills and knowledge required for this unit.
Required skills
Look for evidence that confirms skills in:
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using tools, techniques and equipment necessary to check for correct operation
obtaining and interpreting specifications
comparing system and component performance/operation against specification
select replacement controls and/or components
identifying faulty components and non-compliances
using appropriate test equipment to identify non-compliance
safely remove, contain or add refrigerant to relevant Australian standards or codes
making required adjustments to achieve specifications
sourcing and using relevant catalogues/lists
applying safety procedures, standard operating procedures and legislative
requirements to all work undertaken
documenting results of the adjustments
Required knowledge
Look for evidence that confirms knowledge of:
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operation of refrigerant flow controls including:
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TEV
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internal equalised
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external equalised
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direct operating
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servo operated
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pilot operated
MOP
cross charged
gas charged
capillary tube
thermo electric
electronic TEV and controllers
low side floats
high side floats
distributors
Approved
© Commonwealth of Australia, 2012
Page 5 of 9
Manufacturing Skills Australia
MEM18096A Maintain, repair/replace and adjust refrigerant flow controls and associated equipment Date this document was generated: 6
October 2012
REQUIRED SKILLS AND KNOWLEDGE
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reversing valves
solenoid valves
non return valves
EPR
CPR
condenser bypass valves
liquid level controllers
AX valves
hand expansion valves
measuring instruments/equipment, specifications and procedures for checking
temperature(s)
measuring instruments/equipment, specifications and procedures for checking
components
procedures for reporting non-conformances
procedures and sequence for performing preventative maintenance
specifications, operational characteristics and process for identifying system
components
process for localising and confirming faulty components
process for identifying refrigerant type
procedures and all legislative and regulatory requirements for safely removing the
refrigerant and charging the system
procedures for dismantling, repairing, reassembling and testing components
procedures for selecting replacement parts
procedures for completing maintenance records/service reports
Approved
© Commonwealth of Australia, 2012
Page 6 of 9
Manufacturing Skills Australia
MEM18096A Maintain, repair/replace and adjust refrigerant flow controls and associated equipment Date this document was generated: 6
October 2012
Evidence Guide
EVIDENCE GUIDE
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, adjust, repair or replace refrigerant
flow controls, either liquid or vapour, to manufactures'
specifications safely to relevant Australian standards
codes and regulations. 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 This unit may be assessed on the job, off the job or a
assessment
combination of both. Where assessment occurs off the
job, i.e. the candidate is not in productive work, 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 the maintenance, repair/replacement or adjustment
of refrigerant flow controls, or other units requiring the
exercise of the skills and knowledge covered by this unit.
Method of assessment
Approved
© Commonwealth of Australia, 2012
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, supervisor's 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,
Page 7 of 9
Manufacturing Skills Australia
MEM18096A Maintain, repair/replace and adjust refrigerant flow controls and associated equipment Date this document was generated: 6
October 2012
EVIDENCE GUIDE
standards, manuals and reference materials.
Guidance information for
assessment
Range Statement
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.
Control
Selected from required knowledge list
Parameters
Operational values
Refrigerant control
Could be any selected from list in required
knowledge
Characteristics
Operational parameters of the flow control
Associated valves
Check valves, solenoid valves
Test equipment
Refrigeration gauges, thermometers, multimeter,
vacuum pump, leak detector, associated hand
tools, specialised hand tools
Components
Any part of any flow control selected from list in
required knowledge
Performance
Pressures, temperatures and relationships
Unit Sector(s)
Unit sector
Approved
© Commonwealth of Australia, 2012
Page 8 of 9
Manufacturing Skills Australia
MEM18096A Maintain, repair/replace and adjust refrigerant flow controls and associated equipment Date this document was generated: 6
October 2012
Co-requisite units
Co-requisite units
Competency field
Competency field
Approved
© Commonwealth of Australia, 2012
Maintenance and diagnostics
Page 9 of 9
Manufacturing Skills Australia
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