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Elements and Performance Criteria

1. Prepare to design complex HVAC/R control systems
   • WHS/OHS requirements and workplace procedures for a given work area are identified, obtained and applied
2. WHS/OHS risk control measures and workplace procedures are followed in preparation for the work
3. Scope of the HVAC/R system is determined from the design brief and/or consultations with relevant person/s
4. Design development work is planned in accordance with workplace procedure for timelines in consultation with others involved
5. Design complex HVAC/R control systems
   • Relevant complex control processes and methods are applied to the design
6. Alternative concepts for design are evaluated in accordance with the design brief
7. Safety, functionality and budgetary considerations are incorporated in the design specifications
8. System design draft is checked for compliance in accordance with the design brief and relevant industry standards
9. System design is documented for submission to relevant person/s for approval
10. Unplanned events are dealt with in accordance with problem-solving techniques and workplace procedures
11. Obtain approval for complex HVAC/R control systems design
    • System design is presented to customer and/or relevant person/s in accordance with workplace procedures
12. Requests for alterations to the design are negotiated with relevant person/s in accordance with workplace procedures
13. Final design is documented and approval obtained from relevant person/s in accordance with workplace procedures
14. Quality of work is monitored in accordance with workplace procedures and relevant industry standards

Range Statement

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 control systems for HVAC/R must include at least the following:	two different complex control systems

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Performance Evidence

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 negotiating design alteration requests successfully 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 heating, ventilation and air conditioning/refrigeration (HVAC/R) control systems preparing to design complex HVAC/R control systems.

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Knowledge Evidence

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 HVAC/R control system design, safe working practices and relevant standards, codes and regulations, including: advanced HVAC/R control system design: control diagrams: Australian standard and non-standard symbols as used in a variety of typical HVAC/R systems control diagrams electric/electronic control diagrams electrical installation documents pneumatic diagrams direct digital control (DDC) diagrams controls/electrical power circuit interface nomographs extraction of specific information relating to the operation and control of plant from a variety of typical HVAC/R control diagrams development of control diagrams to required standards given specific system operating parameters control design requirements: standard and statutory requirements economy of operation (energy management) the desired or most appropriate system operating logic for a specified HVAC/R system appropriate mode of control for a specified HVAC/R system control system type selection for specific applications with due to regard to plant size, application, operating environment, available control power supply options, economy and computability to existing or proposed plant and control system components required to assemble and operate the control system of a specified HVAC/R system HVAC/R system energy conservation methods: HVAC/R system control: night cycle optimum stop/start purge cycles chiller/boiler/cooling tower sequencing economy cycles (based on temperature or enthalpy) supply air reset condenser water temperature reset electrical load control: power demand control load limiting load shedding set point relaxation ventilation cycles building management systems: functions of a building management system: autonomous functions input/output (I/O) general I/O installation management items energy management risk management information processing objectives building running costs smoke control as per AS 1668.1 The use of ventilation and air conditioning in buildings - Fire and smoke control in buildings building management system hardware: system architecture communication devices substations personal computers interfaces with other systems I/O functions: digital - I/O digital output with status feedback analogue input/output sensors alarms control sequences 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.

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