NZQA Expiring unit standard
22703 version 2
Page 1 of 5
Title
Apply knowledge of electrical and electronics principles in RAC
Level
3
Purpose
Credits
15
This unit standard is for people who work, or intend to work, in
the refrigeration and air conditioning (RAC) sector of the
engineering industry. It applies to refrigeration and air
conditioning systems that contain electrical components and
systems, and electronic subsystems. It is designed to provide
technician refrigeration and air conditioning systems engineers
with an understanding of electrical principles, properties, and
components, and electronic principles, components, and
control systems so that they can communicate requirements to,
and interact with, electrical and electro-technical personnel.
People credited with this unit standard are able to: demonstrate
and apply knowledge of the function and performance of
electrical components in refrigeration and air conditioning
systems; select electrical components to meet operational
requirements; identify causes of electrical and/or electronic
problems and/or failures; and explain the function and
performance of electronic components and subsystems in
refrigeration and air conditioning systems.
Classification
Mechanical Engineering > Refrigeration and Air Conditioning
Available grade
Achieved
Critical health and
safety prerequisites
Open.
This unit standard is
Entry information
expiring
Explanatory notes
1
References
Building Act 2004;
Electricity Act 1992;
Electricity Amendment Act 1997;
Hazardous Substances and New Organisms Act 1996;
Health and Safety in Employment Act 1992;
Ozone Layer Protection Act 1996;
Electricity Regulations 1997;
AS/NZS 1677:1998, Refrigerating systems – Refrigerant classification;
AS/NZS 3000:2000, Electrical installations;
Competenz
SSB Code 101571
 New Zealand Qualifications Authority 2016
NZQA Expiring unit standard
22703 version 2
Page 2 of 5
Code of Practice for the reduction of emissions of fluorocarbon refrigerants in
refrigeration and air conditioning applications. Institute of Refrigeration, Heating and
Air Conditioning Engineers of New Zealand (IRHACE New Zealand), 2001. Available
from IRHACE, 28 E Lambie Drive, Manukau City, http://www.irhace.org.nz/.
2
The credit value of this unit standard has been calculated on the basis that people
seeking credit have previously acquired competence in the transposition of formulae,
the manipulation of equations, and the use of trigonometric functions; and have
previously acquired understanding of fundamental concepts of physics (mass, length,
time, charge, and current) and their derived units, including voltage, resistance,
pressure, force, gravitational effect, velocity, acceleration, energy, and power.
3
Definition
Organisational procedures refer to documents that include: organisational rules,
codes, and practices; equipment operating instructions; production specifications;
documented quality management systems; and health and safety requirements.
Outcomes and evidence requirements
Outcome 1
Demonstrate and apply knowledge of the function and performance of electrical
components in refrigeration and air conditioning systems.
Evidence requirements
1.1
The properties of electrical components and circuits are checked to ensure they
meet the requirements of refrigeration and air conditioning situations.
Range
1.2
This unit standard is
expiring
Explanations of the functions and principles of operation of electrical
components establish their applications and limitations in refrigeration and air
conditioning situations.
Range
1.3
components – motors, relays, protective devices;
protective devices – fuses, circuit breakers, contactors, overloads.
Analysis of electrical systems identifies safety features of components.
Range
1.4
components – motors, relays, protective devices;
protective devices – fuses, circuit breakers, contactors, overloads;
properties – voltage, current, resistance, power.
components – motors, relays, protective devices;
protective devices – fuses, circuit breakers, contactors, overloads.
The performance of electrical components in refrigeration and air conditioning
systems is assessed in terms of electrical principles and properties.
Range
Competenz
SSB Code 101571
components – motors, relays, protective devices;
protective devices – fuses, circuit breakers, contactors, overloads;
principles and properties – current flow, resistance, electrical
pressure, power, temperature rise, capacitance, inductance,
 New Zealand Qualifications Authority 2016
NZQA Expiring unit standard
22703 version 2
Page 3 of 5
magnetism, earthing.
1.5
The performance of electric motors in refrigeration and air conditioning systems
is assessed in terms of speed, torque, and energy conversion efficiency.
1.6
The speed control of AC and DC motors is explained in terms of electrical
principles.
1.7
A programmable logic controller (PLC) is programmed to perform a simple task
requested by a supervisor.
Outcome 2
Select electrical components to meet refrigeration and air conditioning systems operational
requirements.
Range
electric motors, relays, contactors, overloads.
Evidence requirements
2.1
Analysis of operational systems establishes the required operating parameters
of electrical components.
Range
2.2
parameters may include but are not limited to – speed, torque,
voltage, current, power.
Components selected match plant and regulatory requirements, and features of
the operating environment.
Range
plant requirements may include but are not limited to – starting
requirements, speed, load, cycling times, duty cycle;
features of the operating environment – moisture, vibration,
hazardous gases, hygiene.
This unit standard is
2.3
Components are identified using industry accepted terminology.
expiring
Outcome 3
Identify causes of electrical and/or electronic problems in refrigeration and air conditioning
systems.
Range
electric motors, power supplies.
Evidence requirements
3.1
The selection of instruments for measuring electrical parameters matches the
instruments’ performance characteristics and the operational requirements of
refrigeration and air conditioning situations.
Range
3.2
instruments – voltmeters, ammeters, ohmmeters, wattmeters.
Measuring instruments are used in accordance with established refrigeration
Competenz
SSB Code 101571
 New Zealand Qualifications Authority 2016
NZQA Expiring unit standard
22703 version 2
Page 4 of 5
and air conditioning practice and manufacturers’ specifications.
3.3
Collation and analysis of measurement data establishes the nature of the
problems as being electrical in origin.
3.4
Probable root causes of problems are identified in electrical and/or electronic
terms.
Range
root causes may include but are not limited to – power supply
problems and/or failures, component failure, inappropriate
selection and/or application of components, overload from
mechanical failure.
Outcome 4
Explain the function and performance of electronic components and subsystems in
refrigeration and air conditioning systems.
Evidence requirements
4.1
Explanations of the functions and operation of electronic components
establishes their applications in electronic subsystems.
Range
4.2
components – resistors, capacitors, diodes, silicon controlled
rectifiers, triacs, transistors, thermistors, optoelectronic devices,
thermostats, hot-wire aneomometers, humidity transducers,
pressure transducers.
Explanations of the functions and principles of operation of electronic
subsystems establish their applications and limitations in mechanical
engineering systems.
subsystems – DC power supplies and voltage regulators,
This
unit
resistors,
capacitors,standard
coils, delay lines, rectifiers,is
PLCs, electronic
speed controllers, temperature controls, humidity controls,
pressure controls.
expiring
Range
4.3
The effects of the operating environment on the performance of electronic
subsystems are explained in terms of radio frequency (RF) interference,
temperature, and hazardous atmospheres.
Replacement information
This unit standard has been replaced by unit standards
28961 and 28964.
This unit standard is expiring. Assessment against the standard must take place by
the last date for assessment set out below.
Competenz
SSB Code 101571
 New Zealand Qualifications Authority 2016
NZQA Expiring unit standard
22703 version 2
Page 5 of 5
Status information and last date for assessment for superseded versions
Process
Version Date
Last Date for Assessment
Registration
1
20 June 2006
31 December 2019
Review
2
18 June 2015
31 December 2019
Consent and Moderation Requirements (CMR) reference
0013
This CMR can be accessed at http://www.nzqa.govt.nz/framework/search/index.do.
Please note
Providers must be granted consent to assess against standards (accredited) by NZQA,
before they can report credits from assessment against unit standards or deliver courses
of study leading to that assessment.
Industry Training Organisations must be granted consent to assess against standards by
NZQA before they can register credits from assessment against unit standards.
Providers and Industry Training Organisations, which have been granted consent and
which are assessing against unit standards must engage with the moderation system that
applies to those standards.
Requirements for consent to assess and an outline of the moderation system that applies
to this standard are outlined in the Consent and Moderation Requirements (CMR). The
CMR 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.
This unit standard is
expiring
Competenz
SSB Code 101571
 New Zealand Qualifications Authority 2016