This unit involves the skills and knowledge required to design complex commercial refrigeration systems and select equipment.

It includes applying processes and methods of complex commercial refrigeration systems, safety and relevant industry standards; developing alternative design schemes based on a design brief and customer requirements; and documenting system designs.

The skills and knowledge described in this unit may, in some jurisdictions, require a licence or permit to practice in the workplace subject to regulations for undertaking refrigeration and air conditioning work. Practice in the workplace and during training is also subject to work health and safety (WHS)/occupational health and safety (OHS) regulations.

No other licensing, legislative or certification requirements apply to this unit at the time of publication.

ELEMENTS

PERFORMANCE CRITERIA

Elements describe the essential outcomes.

Performance criteria describe the performance needed to demonstrate achievement of the element.

1

Prepare to design complex commercial refrigeration system

1.1

WHS/OHS requirements and workplace procedures for a given work area are identified, obtained and applied

1.2

WHS/OHS risk control measures and workplace procedures are followed in preparation for the work

1.3

Scope of the proposed refrigeration system is determined from the design brief and/or consultations with relevant person/s

1.4

Design development work is planned in accordance with workplace procedures for timelines in consultation with others involved

2

Design complex commercial refrigeration system

2.1

Relevant commercial refrigeration processes and methods are applied to the design

2.2

Alternative concepts for design are evaluated in accordance with the design brief

2.3

Safety, functionality and budgetary considerations are incorporated in the design specifications

2.4

System design draft is checked for compliance in accordance with the design brief and relevant industry standards

2.5

System design is documented and submitted to relevant person/s for approval in accordance with workplace procedures

2.6

Unplanned events are dealt with in accordance with problem-solving techniques and workplace procedures

3

Obtain approval for complex commercial refrigeration system design

3.1

System design is presented to customer and/or relevant person/s in accordance with workplace procedures

3.2

Requests for alterations to the design are negotiated with relevant person/s in accordance with workplace procedures

3.3

Final design is documented and approval obtained from relevant person/s in accordance with workplace procedures

3.4

Quality of work is monitored in accordance with workplace procedures and relevant industry standards

Evidence required to demonstrate competence in this unit must be relevant to and satisfy all of the requirements of the elements, performance criteria and range of conditions on at least one occasion and include:

developing outlines of alternative designs

developing the design within the safety, regulatory, functional requirements and budget limitations

documenting and presenting design effectively

successfully negotiating design alteration requests

obtaining approval for final design

dealing with unplanned events

applying relevant work health and safety (WHS)/occupational health and safety (WHS/OHS) requirements, including using risk control measures

designing complex commercial refrigeration system

preparing to design complex commercial refrigeration system.

Evidence required to demonstrate competence in this unit must be relevant to and satisfy all of the requirements of the elements, performance criteria and range of conditions and include knowledge of:

complex commercial refrigeration system design, safe working practices and relevant standards, codes and regulations, including:

commercial refrigeration system types:

medium and low temperature applications

operating conditions

system operating and service requirements

refrigerant types

components

multiple evaporator systems

multiple temperature systems

multiple compressor (rack) systems

two stage compressors

multiplex systems

defrost requirements and methods

electric defrost systems

hot gas defrost systems

cool gas defrost systems

manufacturer's data:

rating tables

selection tables

catalogues

operating characteristics:

effects of temperature glide with blended refrigerants

pH charts

refrigerating effect

heat of compression

heat rejected on high side of the system

required mass flowrate of refrigerant

volume flowrate at various points in system

theoretical compressor power

required condenser capacity

refrigerant flow controls:

refrigerant regulating valves

solenoid valves

expansion valves

pressure regulating valves

automatic systems controls:

cycling controls

pressure-stats

thermo-stats

defrost controls

monitoring and alarm controls

energy management systems

refrigeration automation system

control strategies

control modes

system design:

required cooling capacity per day

running time and required system cooling capacity

system capacity control for peak and low load

refrigeration system diagrams

refrigerant, equipment, major component, controls, piping and accessory selection

problem-solving techniques

relevant job safety assessments or risk mitigation processes

relevant manufacturer specifications

relevant WHS/OHS legislated requirements

relevant workplace budget, quality, policies and procedures

relevant workplace documentation.

Assessors must hold credentials specified within the Standards for Registered Training Organisations current at the time of assessment.

Assessment must satisfy the Principles of Assessment and Rules of Evidence and all regulatory requirements included within the Standards for Registered Training Organisations current at the time of assessment.

Assessment must occur in workplace operational suitable situations where it is appropriate to do so; where this is not appropriate, assessment must occur in simulated suitable workplace operational situations that replicate workplace conditions.

Assessment processes and techniques must be appropriate to the language, literacy and numeracy requirements of the work being performed and the needs of the candidate.

Resources for assessment must include access to:

a range of relevant exercises, case studies and/or simulations

relevant and appropriate materials, tools, facilities and equipment currently used in industry

applicable documentation, including workplace procedures, equipment specifications, regulations, codes of practice and operation manuals.

Foundation skills essential to performance are explicit in the performance criteria of this unit of competency.

Range is restricted to essential operating conditions and any other variables essential to the work environment.

Non-essential conditions may be found in the UEE Electrotechnology Training Package Companion Volume Implementation Guide.

Designing a complex commercial refrigeration system must include at least the following:

one multiple major component, including:

compressors

condenser

evaporators

circuits and/or systems

associated components and controls

Electrotechnology

Refrigeration and air-conditioning