24533 version 2
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Demonstrate and apply knowledge of HVAC control and building
management system design
Level
6
Credits
15
Purpose
This unit standard is intended for use in diploma courses in mechanical
engineering, and covers knowledge of building management systems and the
design of associated controls for heating, ventilating, and air conditioning
(HVAC) systems.
People credited with this unit standard are able to: demonstrate knowledge of
HVAC control and building management systems; and design, select
components for, and prepare design documents for a control system for
automatic control of an HVAC system in a building.
Subfield
Mechanical Engineering
Domain
Applied Principles of Mechanical Engineering
Status
Registered
Status date
14 December 2007
Date version published
19 March 2010
Planned review date
31 December 2015
Entry information
Recommended: Unit 24530, Demonstrate and apply
knowledge of water based system design for HVAC
applications; and Unit 24532, Demonstrate and apply
knowledge of air handling system design for HVAC
applications; or demonstrate equivalent knowledge and
skills.
Replacement information
This unit standard replaced unit standard 3215.
Accreditation
Evaluation of documentation and visit by NZQA and
industry.
Standard setting body (SSB)
Competenz
Accreditation and Moderation Action Plan (AMAP) reference
0013
This AMAP can be accessed at http://www.nzqa.govt.nz/framework/search/index.do.
 New Zealand Qualifications Authority 2016
24533 version 2
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Special notes
1
References
Building Act 2004;
Building Code. Available from http://www.dbh.govt.nz/bcl-get-a-copy-of-buildingcode.
Department of Building and Housing compliance documents for the New Zealand
Building Code (compliance documents). Available at
http://www.dbh.govt.nz/building-code-compliance-documents.
2
Definitions
Industry practice – the application of relevant legislation, regulations, standards,
codes, and safe and sound practices, generally accepted by competent practitioners
within the mechanical building services industry.
Building Management systems – Computer-based systems used to automatically
control and monitor HVAC systems and other building features such as lighting,
security, and access. But see Special Note 3b.
3
Range
a The performance of elements 2, 3, and 4 must reflect compliance with relevant
legislation, regulations, standards, and codes of practice.
b For the purpose of this unit standard, assessment is limited to the HVAC control
functions of Building Management Systems.
Elements and performance criteria
Element 1
Demonstrate knowledge of HVAC control and building management systems.
Performance criteria
1.1
Different types of HVAC control and building management systems are defined
and their features compared.
Range
1.2
self-acting systems, stand-alone electric systems; stand-alone
electronic systems, distributed networked electronic systems.
The operation of a modern HVAC control and building management system is
explained with reference to processes and components.
Range
processes – control logic; sensing of changes in temperature,
pressure, velocity, current and relative humidity; development of a
suitable response in accordance with pre-defined settings or
program; instruction of controlled devices to respond; storage and
dissemination of data;
components – self-acting valves, sensors, flow switches, damper
actuators, valve actuators, input/output modules, power supply
modules, controllers, display modules, networks, relays,
contactors, timers, variable speed drives, current transformers,
safety devices, energy usage meters.
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24533 version 2
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1.3
The basic principles of control methods and responses used in HVAC systems
are explained with reference to typical applications.
Range
methods – open loop, closed loop on-off, modulating;
responses – two position, floating, proportional (P), proportionalintegral (PI), proportional-integral-derivative (PID).
Element 2
Design a control system for automatic control of an HVAC system in a building.
Range
design for a small to medium commercial or industrial building, covering the
control of all HVAC functions, by means of a stand-alone or a distributed
networked system.
Performance criteria
2.1
Design provides a viable solution to the given requirements in accordance with
industry practice.
2.2
Design demonstrates analytical procedures, control methods, and control
responses appropriate to the given requirements and in accordance with
industry practice.
Range
analytical procedures – development of control logic, selection of
control method, selection of operating ranges, selection of control
response, determination of required response rates and settings,
assessment of safety responses;
control methods may include – open loop, closed loop on-off,
modulating;
control responses may include – two position, floating, proportional
(P), proportional-integral (PI), proportional-integral-derivative
(PID).
Element 3
Select components for a control system for automatic control of an HVAC system in a
building.
Range
components may include, but are not limited to – self-acting valves, sensors,
flow switches, damper actuators, valve actuators, input/output modules, power
supply modules, controllers, display modules, networks, relays, contactors,
timers, variable speed drives, current transformers, safety devices.
Performance criteria
3.1
Component ratings are appropriate for the loads imposed on them in
accordance with industry practice.
Range
ratings may include – maximum and minimum flow rate, pressure,
temperature, relative humidity, velocity, voltage, current.
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24533 version 2
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3.2
Components are suitable for the application in accordance with industry
practice.
Range
suitability may include consideration of – function, type of network,
durability, response rate, range, reliability, accuracy, sensitivity.
Element 4
Prepare design documents for a control system for automatic control of an HVAC system
in a building.
Range
documentation covering the work of elements 2 and 3.
Performance criteria
4.1
Documentation includes sketch plans showing the physical location of all
components within the building in accordance with industry practice.
4.2
Documentation includes schematic drawings showing all components of the
control system and all relevant components of the system being controlled, in
the correct sequence in accordance with industry practice.
4.3
Documentation includes control wiring diagrams showing electrical connections
to all components in accordance with industry practice.
4.4
Documentation includes specifications of all components in accordance with
industry practice.
4.5
Documentation includes operating description of the control system and its
components, and the responses of the controlled system in accordance with
industry practice.
Please note
Providers must be accredited by NZQA, or an inter-institutional body with delegated
authority for quality assurance, before they can report credits from assessment against
unit standards or deliver courses of study leading to that assessment.
Industry Training Organisations must be accredited by NZQA before they can register
credits from assessment against unit standards.
Accredited providers and Industry Training Organisations assessing against unit standards
must engage with the moderation system that applies to those standards.
Accreditation requirements and an outline of the moderation system that applies to this
standard are outlined in the Accreditation and Moderation Action Plan (AMAP). The
AMAP also includes useful information about special requirements for organisations
wishing to develop education and training programmes, such as minimum qualifications for
tutors and assessors, and special resource requirements.
 New Zealand Qualifications Authority 2016
24533 version 2
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Comments on this unit standard
Please contact Competenz info@competenz.org.nz if you wish to suggest changes to the
content of this unit standard.
 New Zealand Qualifications Authority 2016