Standard
UPDATE AVAILABLE
AS/NZS 3500.4:2015
[Superseded]Plumbing and drainage, Part 4: Heated water services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: 14/12/2015
Pages: 116
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 Equivalent pipe sizes
1.8 Velocity requirements
1.9 Water temperature
1.9.1 Storage temperature
1.9.2 Sanitary fixtures delivery temperature
1.9.3 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 Soft solders
2.6.5 Filler rods for stainless steel joints
2.6.6 Roll-grooved 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 Capillary fittings
4.3.4 Silver brazing
4.3.4.1 Joints
4.3.4.2 Taps and valves
4.3.5 Soft soldering
4.3.6 Flanged joints
4.3.7 Roll-grooved joints
4.3.8 Jointing of stainless steel pipe and fittings
4.3.8.1 Jointing of piping, up to and including DN 25
4.3.8.2 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
4.12.3.1 General
4.12.3.2 Expansion allowance for copper pipework
4.12.3.3 Expansion of fixed offsets in copper pipework
4.12.3.4 U-bends, coiled loops, offsets and lyre bends in copper pipework
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
5.9.1 General
5.9.2 Required set pressure of valves (for unvented water heaters)
5.9.3 Installation of valves
5.10 Multiple installations of pressure-type storage water heaters
5.10.1 General
5.10.2 Balanced flow conditions
5.10.3 Positioning and sizing of control valves 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 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 Operating instructions
Appendix A
Appendix B
B1 Water analysis
B2 Conductivity and total dissolved solids (TDS)
Appendix C
Appendix D
Appendix E
Appendix F
F1 General
F2 Volumetric storage capacity
F3 Recommended operating temperature
F4 Temperature/pressure-relief valve
F5 Collector/container size ratio
F5.1 Normal conditions
F5.2 Non-optimum conditions
F6 Components
F7 Claimed performance
Appendix G
G1 General
G2 Support
G2.1 ‘With pitch’ installations
G2.2 ‘Against pitch’ installations
G2.3 ‘Cross-pitch’ installations
G3 Points to note
Appendix H
H1 General
H2 Anticipated solar fraction
H3 Solar radiation data
Appendix I
I1 General
I2 Sun locator
I3 Approximate method of determining solar altitude
Appendix J
Appendix K
Appendix L
L1 Scope
L2 Climate zones
Appendix M
M1 Scope
M2 Climate regions
M3 Frost areas
Appendix N
N1 Scope
N2 General
N3 Maintenance of heated water services
Amendment control sheet
Bibliography
Cited references in this standard
[Current]
Multilayer pipes for pressure applications, Part 1: Multilayer piping systems for hot and cold water plumbing applications — General (ISO 21003-1:2008, MOD)
[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)
Content history
[Available Superseded]
[Available Superseded]
[Superseded]
DR AS/NZS 3500.4:2014
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