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AS/NZS 3500.4:2018
[Available Superseded]Plumbing and drainage, Part 4: Heated water services
Sets out requirements for the design, installation and commissioning of heated water services using drinking water, rainwater or a combination thereof. It applies to new installations as well as alterations, additions and repairs to existing installations.
Published: 29/06/2018
Pages: 141
Table of contents
Cited references
Content history
Table of contents
Header
About this publication
Preface
1 Scope and general
1.1 Scope
1.2 Application
1.2.1 Australia
1.2.2 New Zealand
1.3 Normative references
1.4 Definitions
1.5 Plastics abbreviations
1.6 Water chemistry
1.7 Pipe sizes
1.8 Velocity requirements
1.9 Pressure requirements
1.9.1 Available pressure
1.9.2 Pressure at outlets
1.9.3 Pressure losses
1.9.4 Pressure differential
1.9.5 Pressure booster pumps
1.9.5.1 General
1.9.5.2 Pump control
1.10 Flow rates
1.11 Water temperature
1.11.1 Storage temperature
1.11.2 Sanitary fixtures delivery temperature
1.11.3 Solutions for control of delivery temperatures
2 Materials and products
2.1 Scope of section
2.2 Authorization
2.3 Selection and use of materials and products
2.4 Limitations on use of pipes and fittings
2.4.1 General
2.4.2 Metallic pipes and fittings
2.4.3 Plastics pipes and fittings
2.5 Safe tray and safe waste materials
2.5.1 Safe tray
2.5.2 Safe wastes
2.6 Joints
2.6.1 Flanged joints
2.6.2 Elastomeric seals
2.6.3 Silver brazing alloy
2.6.3.1 Copper and copper alloys
2.6.3.2 Stainless steels
2.6.4 Filler rods for stainless steel joints
2.7 Concrete and mortar
2.7.1 Concrete mix
2.7.2 Cement mortar
2.7.3 Chemical admixtures
2.7.4 Water for concrete and mortar
2.7.5 Steel reinforcement
2.8 Miscellaneous materials
2.8.1 Timber
2.8.2 External protective coatings
3 Cross-connection and backflow prevention and thermostatic mixing valves
3.1 Scope of section
3.2 Cross-connection control and backflow prevention
3.3 Thermostatic mixing valves
4 Installation of cold and heated water piping and controls
4.1 Scope of section
4.2 Proximity to electrical cables and gas pipes
4.2.1 General
4.2.2 Electrical cables, gas pipes and other services
4.2.2.1 Above- and below-ground pipework
4.2.2.2 Above-ground pipework
4.2.2.3 Below ground—Electrical cables and gas pipes
4.2.2.4 Below ground—Communications services
4.2.2.5 Below ground—Crossover
4.3 Methods of jointing
4.3.1 General
4.3.2 Compression-type fittings
4.3.3 Joining of copper and copper alloy pipes
4.3.4 Silver brazing
4.3.4.1 Joints
4.3.4.2 Taps and valves
4.3.5 Flanged joints
4.3.6 Roll-grooved joints
4.3.7 Jointing of stainless steel pipe and fittings
4.3.7.1 Jointing of piping, up to and including DN 25
4.3.7.2 Jointing of piping larger than DN 25
4.4 Support and fixing above ground
4.4.1 General
4.4.2 Brackets, clips and hangers
4.4.3 Limitations on pipe supports
4.4.4 Spacing
4.4.5 Securing of pipes and fittings
4.5 Location of piping
4.5.1 Concealed piping
4.5.1.1 Walls
4.5.1.2 Chases, ducts or conduits
4.5.1.3 Under concrete slabs
4.5.2 Protection during building construction
4.5.3 Floor or roof penetrations
4.5.4 Provision for movement of encased piping
4.6 Bedding and backfill
4.7 Contaminated areas—installation
4.8 Corrosive areas
4.9 Depth of cover
4.9.1 Depth of cover in public areas
4.9.2 Depth of cover in private areas
4.10 Protection against freezing
4.10.1 Requirement for protection
4.10.2 Piping located outside buildings
4.10.3 Pipes located on metal roofs
4.10.4 Pipes located inside buildings
4.10.4.1 General
4.10.4.2 Pipes in unheated roof spaces
4.10.4.3 Pipes adjacent to external walls
4.10.5 Insulation of piping and fittings
4.11 Cold water piping and storage tanks
4.11.1 General
4.11.2 Cold water storage tank
4.11.2.1 General
4.11.2.2 Water storage tank capacity
4.11.2.3 Flow capacity
4.11.2.4 Cold water storage tank overflow
4.11.2.5 Position of cold water storage tanks
4.11.3 Safe tray for cold water storage tanks
4.11.4 Support for separately mounted cold water storage tanks
4.11.4.1 Platform
4.11.4.2 Spacing between cold water storage tank and safe tray
4.12 Installation of heated water services
4.12.1 Design and installation
4.12.2 Identification
4.12.3 Provision for expansion
4.12.4 Gradient
4.12.5 Maximum rise of heated water supply pipes
4.12.6 Shower assemblies
4.12.7 Venting of secondary circuit
4.12.8 Recirculation of cold water
5 Installation of water heaters—general requirements
5.1 Scope of section
5.2 Water heaters
5.2.1 Selection of anode
5.2.2 Working pressure
5.3 Location
5.3.1 Placement
5.3.2 Accessibility and clearances
5.3.3 Ventilation and fluing
5.4 Protection against damage from leaking water
5.4.1 Concealed water storage tanks
5.4.2 Unconcealed water storage tanks
5.4.3 Safe tray construction
5.4.4 Safe wastes
5.4.4.1 Sizes of safe wastes
5.4.4.2 Safe waste construction
5.4.4.3 Safe waste installation
5.4.5 Placement of water heater or cold water storage tank on a safe tray
5.5 Support
5.5.1 Support of water storage tanks installed in a roof
5.5.2 Support of water heaters or water storage tanks installed above a roof
5.5.3 Support of water heaters or water storage tanks installed other than in a roof space or above a roof
5.5.4 Seismic restraints
5.6 Corrosion prevention and weather protection
5.6.1 Water heater base—Corrosion avoidance
5.6.2 Weather protection of externally installed water heaters
5.7 Connections to water heaters
5.8 Pressure relief and venting of water heaters and containers
5.9 Valves and expansion vessels
5.9.1 General
5.9.2 Required set pressure of valves (for unvented water heaters)
5.9.3 Set pressure of expansion vessels
5.9.4 Installation of valves and expansion vessels
5.10 Multiple installations of pressure-type storage water heaters
5.10.1 General
5.10.2 Balanced flow conditions
5.10.3 Location and sizing of control valves and expansion vessels on the cold water supply
5.11 Temperature/pressure-relief valve and expansion control valve drain lines
5.11.1 Size and material
5.11.2 Interconnection of drain lines
5.11.2.1 Individual water heaters
5.11.2.2 Multiple relief valves
5.11.3 Installation
5.11.4 Common stack discharge
5.11.5 Tundish drain lines
5.11.6 Areas subject to freezing
5.12 Vent pipes
5.12.1 Installation
5.12.1.1 Storage water heaters
5.12.1.2 Heat exchange water heaters and boiling water units
5.12.2 Termination of vent pipe
5.12.3 Cold water storage tank-fed water heaters (other than side-fed types)
5.12.4 Vented storage water heaters, inlet pressure-controlled
6 Installation of solar water heaters
6.1 Scope of section
6.2 Application of section (New Zealand only)
6.3 General installation requirements
6.3.1 Sizing and solar performance
6.3.2 Location
6.3.3 Structural integrity
6.3.4 Water hardness and dissolved solids
6.3.5 Collector circuit
6.3.6 Flow and return pipes and fittings
6.3.7 Corrosion resistance
6.3.8 Entrapped air
6.3.9 Over-temperature protection
6.3.10 Pressure and temperature relief
6.3.11 Drain lines
6.3.12 Unintentional circulation
6.3.13 Mounting
6.3.14 Supplementary heating
6.3.15 Penetrations through roof cladding
6.4 Installation of solar water heater storage containers
6.4.1 General
6.4.2 Thermosiphon systems
6.4.3 Support
6.4.4 Safe trays
6.4.5 Auxiliary water heating
6.5 Installation of collectors
6.5.1 Positioning
6.5.1.1 Shade
6.5.1.2 Commercial solar collector orientation
6.5.1.2A Residential solar collector orientation
6.5.1.3 Inclination
6.5.1.4 Provision for removal of collector
6.5.2 Precautions
6.5.2.1 Avoidance of damage
6.5.2.2 Frost-prone areas
6.5.2.3 Hail-prone areas
6.6 Solar water heaters with remote containers
6.6.1 Pumps and controllers
6.6.2 Pump and controller installation
7 Uncontrolled heat sources
7.1 Scope of section
7.2 Water heaters with uncontrolled energy source
7.2.1 Installation
7.2.2 Supplementary external heating
7.2.3 Provision for drainage
8 Energy efficiency
8.1 Scope of section
8.2 Thermal insulation
8.2.1 Piping associated with storage water heaters
8.2.2 Other piping for heated water systems
8.3 Protection of insulation
8.3.1 Insulation exposed to the weather
8.3.2 Protection of thermal insulation on buried piping
8.4 Heat traps
8.5 Container for storage of heated water
8.6 R-value calculations
9 Testing and commissioning
9.1 Scope of section
9.2 Flushing
9.3 Testing
9.4 Commissioning
9.5 Heated water circulating system diagram
9.6 Operating instructions
10 Sizing and installation of circulatory heated water reticulation
10.1 Scope of section
10.2 Temperature requirements
10.3 Flow requirements
10.3.1 General
10.3.2 Flow rates
10.3.3 Loading units
10.3.4 Continuous demand outlets
10.3.5 Probable simultaneous demand (PSD)
10.3.6 Probable simultaneous flow rate (PSFR)
10.4 Maximum pressure requirements
10.4.1 Maximum pressure within buildings
10.4.2 Maximum differential
10.5 Pressure requirements for circulatory heated water systems
10.6 Velocity requirements
10.6.1 Circulating pumps
10.6.1.1 General
10.6.1.2 Return pipe
10.6.1.3 Sizing circulating pumps
10.6.2 Velocity, pressure and temperature
10.7 Expansion of heated water
10.8 Air elimination
10.8.1 General
10.8.2 Air elimination valves
10.9 Location of circulatory piping
10.9.1 General
10.9.2 Branch off-takes
10.9.3 Proximity to cold water piping
10.10 Isolating valves
10.10.1 General
10.10.2 Location
10.10.3 Multiple apartments, dwellings and secure areas
10.11 Balancing valves
10.11.1 General
10.11.2 Commissioning
Appendix A
A1 Water analysis
A2 Conductivity and total dissolved solids (TDS)
Appendix B
Appendix C
Appendix D
Appendix E
E1 General
E2 Volumetric storage capacity
E3 Recommended operating temperature
E4 Temperature/pressure-relief valve
E5 Collector/container size ratio
E5.1 Normal conditions
E5.2 Non-optimum conditions
E6 Components
E7 Claimed performance
Appendix F
F1 General
F2 Support
F2.1 ‘With pitch’ installations
F2.2 ‘Against pitch’ installations
F2.3 ‘Cross-pitch’ installations
F3 Points to note
Appendix G
G1 General
G2 Anticipated solar fraction
G3 Solar radiation data
Appendix H
H1 General
H2 Sun locator
H3 Approximate method of determining solar altitude
Appendix I
Appendix J
Appendix K
K1 Scope
K2 Climate zones
Appendix L
L1 General
L2 Climate regions
L3 Frost areas
Appendix M
M1 Scope
M2 General
M3 Maintenance of heated water services
Appendix N
N1 Scope
N2 General
N3 Calculating thermal length change
N4 Provision for expansion
N5 Calculating the offset length (LOffset)
N6 Offsets in bends with two anchor points
N7 Expansion loops
N8 Calculating the offset length (LOffset) for an expansion loop or U-bend
N9 Branch off-takes
N10 Branch off-takes in ducts
Appendix O
Appendix P
Bibliography
Amendment control sheet
AS/NZS 3500.4:2018
Amendment No. 1 (2018)
Revised text
Amendment No. 2 (2020)
Revised text
Appendix Former Wording
Purpose of this Appendix
Former wording texts and notes
Former Clause 1.9.4.1 Former Heading
Former Clause 1.9.4.2 Former Wording
Former Clause 10.4 Former Wording
Cited references in this standard
[Current]
Polybutylene (PB) plumbing pipe systems — Metric series, Part 2: Mechanical and fusion jointing systems
[Current]
Multilayer pipes for pressure applications, Part 2: Multilayer piping systems for hot and cold water plumbing applications — Pipes (ISO 21003-2:2008, MOD)
[Current]
Multilayer pipes for pressure applications, Part 3: Multilayer piping systems for hot and cold water plumbing applications — Fittings (ISO 21003-3:2008, MOD)
[Current]
Multilayer pipes for pressure applications, Part 5: Multilayer piping systems for hot and cold water plumbing applications — Fitness for purpose of the system (ISO 21003-5:2008, MOD)
[Current]
Multilayer pipes for pressure applications, Part 7: Multilayer piping systems for hot and cold water plumbing applications — Assessment of conformity (ISO/TS 21003-7:2008, MOD)
Content history
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[Available Superseded]
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