• AS/NZS 3500.4.2:1997

    AvailableSuperseded An Available Superseded Standard is one, which has been made available for a period of time although it has been formally superseded by another Standard. Its availability is maintained where it is referenced in legislation/regulations or in other Standards and its use should be restricted to where so referenced. No responsibility is taken by SAI Global as to the ongoing technical validity of such a Standard, the responsibility resting with the referencing authority.
    Add to Watchlist
    This Standard has been added successfully to your Watchlist.
    Please visit My Watchlist to see all standards that you are watching.
    Please log in or to add this standard to your Watchlist.
    We could not add this standard to your Watchlist.
    Please retry or contact support for assistance.
    We could not add this standard to your Watchlist.
    Please retry or contact support for assistance.
    You have already added this standard to your Watchlist.
    Visit My Watchlist to view the full list.

    National Plumbing and Drainage Hot water supply systems - Acceptable solutions

    Available format(s):  Hardcopy, PDF 1 User, PDF 3 Users, PDF 5 Users, PDF 9 Users

    Language(s): 

    Published date:  10-05-1997

    Publisher:  Standards Australia

    Add to Watchlist

    Add To Cart

    Table of Contents - (Show below) - (Hide below)

    1 - AS/NZS 3500.4.2:1997 NATIONAL PLUMBING AND DRAINAGE - HOT WATER SUPPLY SYSTEMS-ACCEPTABLE SOLUTIONS
    4 - PREFACE
    5 - CONTENTS
    8 - FOREWORD
    9 - SECTION 1 SCOPE AND GENERAL
    9 - 1.1 SCOPE AND APPLICATION
    9 - 1.2 REFERENCED DOCUMENTS
    9 - 1.3 DEFINITIONS
    9 - 1.3.1 Acceptable solution
    9 - 1.3.2 Deemed to satisfy
    9 - 1.3.3 Container
    9 - 1.4 WATER QUALITY
    10 - 1.5 EQUIVALENT PIPE SIZES
    10 - 1.6 WATER TEMPERATURE
    10 - 1.6.1 Storage temperature
    10 - 1.6.2 Sanitary fixtures delivery temperature
    11 - SECTION 2 MATERIALS AND PRODUCTS
    11 - 2.1 SCOPE OF SECTION
    11 - 2.2 AUTHORIZATION
    11 - 2.3 LIMITS ON USE OF PIPES AND FITTINGS
    11 - 2.3.1 Copper pipes
    11 - 2.3.2 Copper alloy pipes
    11 - 2.3.3 Copper alloy fittings
    11 - 2.3.4 Galvanized steel
    11 - 2.3.5 Polybutylene (PB)
    12 - 2.3.6 Polyethylene (PE)
    12 - 2.3.7 Cross-linked polyethylene (PE-X)
    12 - 2.3.8 Polypropylene (PP-R)
    12 - 2.3.9 Chlorinated polyvinyl chloride (CPVC)
    12 - 2.3.10 Stainless steel
    13 - 2.4 CISTERN (COLD WATER STORAGE TANK) MATERIALS
    13 - 2.4.1 Copper
    13 - 2.4.2 Galvanized steel
    13 - 2.4.3 Stainless steel
    13 - 2.4.4 Other materials
    13 - 2.5 SAFE TRAY AND SAFE WASTE MATERIALS
    13 - 2.5.1 Safe tray
    13 - 2.5.2 Safe wastes
    13 - 2.6 JOINTING
    13 - 2.6.1 Elastomeric rings
    13 - 2.6.2 Elastomeric gaskets
    13 - 2.6.3 Silver brazing alloy
    13 - 2.6.4 Soft solders
    14 - 2.6.5 Filler rods for stainless steel joints
    14 - 2.7 BEDDING AND BACKFILL
    14 - 2.8 MISCELLANEOUS MATERIALS
    14 - 2.8.1 Timber
    14 - 2.8.2 Thermal insulation
    14 - 2.8.3 External protective coatings
    15 - SECTION 3 INSTALLATION OF COLD AND HOT WATER PIPINT AND CONTROLS
    15 - 3.1 SCOPE OF SECTION
    15 - 3.2 SAFETY PRECAUTIONS
    15 - 3.2.1 Electrical earthing
    15 - 3.2.2 Proximity to electrical cables and gaspipes
    15 - 3.3 METHODS OF JOINTING
    15 - 3.3.1 General
    15 - 3.3.2 Prohibited methods
    16 - 3.3.3 Threading
    16 - 3.3.4 Compression-type fittings
    16 - 3.3.5 Flanged joints
    16 - 3.3.6 Jointing of stainless steel pipe and fittings
    16 - 3.3.7 Alternative jointing
    17 - 3.4 SUPPORT AND FIXING ABOVE GROUND
    17 - 3.4.1 General
    17 - 3.4.2 Brackets, clips and hangers
    17 - 3.4.3 Prohibited supports
    17 - 3.4.4 Spacing
    17 - 3.4.5 Securing of pipes and fittings
    17 - 3.5 LOCATION OF PIPING
    17 - 3.5.1 Walls
    18 - 3.5.2 Chases, ducts or conduits
    19 - 3.5.3 Under concrete slabs
    19 - 3.5.4 Protection during building construction
    19 - 3.5.5 Floor or roof penetrations
    19 - 3.5.6 Insulation of buried piping
    19 - 3.5.7 Insulation of encased piping
    19 - 3.6 PIPES IN WATER- CHARGED OR FILLED GROUND
    19 - 3.7 CROSS-CONNECTION CONTROL AND BACKFLOW PREVENTION
    19 - 3.8 CONTAMINATED AREAS
    19 - 3.8.1 General
    19 - 3.8.2 Installation
    20 - 3.9 CORROSIVE AREAS
    20 - 3.10 DEPTH OF COVER IN PUBLIC AREAS
    20 - 3.11 DEPTH OF COVER IN PRIVATE AREAS
    20 - 3.12 PROTECTION AGAINST FREEZING
    20 - 3.12.1 Requirement for protection
    20 - 3.12.2 Piping located outside buildings
    21 - 3.12.3 Pipes located on metal roofs
    21 - 3.12.4 Pipes located inside buildings
    21 - 3.12.5 Insulation of piping
    22 - 3.13 COLD WATER PIPING AND CISTERNS
    22 - 3.13.1 General
    22 - 3.13.2 Cold water cisterns (See Figures 4.1 and 4.2)
    24 - 3.13.3 Safe tray for cold water cistern
    24 - 3.13.4 Support for separately mounted cisterns
    25 - 3.14 INSTALLATION OF HOT WATER SUPPLY
    25 - 3.14.1 Layout and size
    25 - 3.14.2 Identification
    25 - 3.14.3 Provision for expansion
    26 - 3.14.4 Gradient
    26 - 3.14.5 Maximum rise of hot water supply pipes
    28 - 3.14.6 Shower assemblies
    28 - 3.14.7 Venting of secondary circuit
    28 - 3.14.8 Terminal fittings
    28 - 3.15 TEMPERATURE CONTROL DEVICES
    28 - 3.16 THERMOSTATIC MIXING VALVES
    30 - SECTION 4 INSTALLATION OF WATER HEATERS-GENERAL REQUIREMENTS
    30 - 4.1 SCOPE OF SECTION
    30 - 4.2 WATER HEATERS
    30 - 4.2.1 Water heaters
    30 - 4.2.2 Selection of anode
    30 - 4.2.3 Working pressure
    30 - 4.2.4 Auxiliary controls
    30 - 4.3 LOCATION
    30 - 4.3.1 Placement
    30 - 4.3.2 Accessibility and clearances
    30 - 4.3.3 Ventilation and fluing
    30 - 4.4 PROTECTION AGAINST DAMAGE FROM LEAKING WATER
    30 - 4.4.1 Concealed water containers
    31 - 4.4.2 Unconcealed storage water containers
    31 - 4.4.3 Safe tray construction
    31 - 4.4.4 Safe wastes
    31 - 4.4.5 Placement of water heater or cistern on a safe tray
    32 - 4.5 SUPPORT
    32 - 4.5.1 Support of water containers installed in a roof
    32 - 4.5.2 Support of water containers installed above a roof
    32 - 4.5.3 Support of water containers installed other than in a roof space or above a roof
    33 - 4.5.4 Seismic restraints
    33 - 4.6 CORROSION PREVENTION AND WEATHER PROTECTION
    33 - 4.6.1 Water heater base-corrosion avoidance
    33 - 4.6.2 Weather protection of externally installed water heaters
    33 - 4.7 CONNECTIONS TO WATER HEATERS
    33 - 4.8 PRESSURE RELIEF AND VENTING OF WATER HEATERS AND CONTAINERS
    34 - 4.9 VALVES
    34 - 4.9.1 General
    34 - 4.9.2 Required set pressure of valves (for unvented water heaters)
    34 - 4.9.3 Installation of valves
    41 - 4.10 MULTIPLE INSTALLATIONS OF PRESSURE-TYPE STORAGE WATER HEATERS
    41 - 4.10.1 General
    41 - 4.10.2 Balanced flow conditions
    42 - 4.10.3 Positioning and sizing of pressure control valves
    43 - 4.11 MULTIPLE INSTANTANEOUS WATER HEATERS
    43 - 4.12 TEMPERATURE/PRESSURE/ RELIEF AND EXPANSION CONTROL VALVE DRAIN LINES
    43 - 4.12.1 Size and material
    43 - 4.12.2 Interconnection of drain lines
    43 - 4.12.3 Installation
    44 - 4.12.4 Common stack discharge
    44 - 4.12.5 Tundish drain lines
    44 - 4.12.6 Areas subject to freezing
    44 - 4.13 VENT PIPES
    44 - 4.13.1 Installation
    44 - 4.13.2 Termination of vent pipe
    45 - 4.13.3 Cistern-fed water heaters (other than side-fed types)
    45 - 4.13.4 Vented storage water heaters, inlet pressure- controlled
    55 - SECTION 5 INSTALLATION OF SOLAR WATER HEATERS
    55 - 5.1 SCOPE OF SECTION
    55 - 5.2 GENERAL
    55 - 5.2.1 Performance
    55 - 5.2.2 Solar water heater
    55 - 5.2.3 Location
    55 - 5.2.4 Sizing
    55 - 5.3 INSTALLATION OF SOLAR WATER HEATER CONTAINER
    55 - 5.3.1 Solar water heater containers
    55 - 5.3.2 Containers installed on or above a roof
    56 - 5.3.3 Containers installed in a roof
    56 - 5.3.4 Protection against damage from leaking water
    56 - 5.3.5 Connection to containers
    56 - 5.3.6 Pressure relief and venting of containers
    56 - 5.3.7 Valves
    56 - 5.3.8 Relief and expansion valve drain lines
    56 - 5.3.9 Vent pipes
    56 - 5.3.10 Supplementary heating connections
    56 - 5.4 INSTALLATION OF COLLECTORS
    56 - 5.4.1 Positioning
    57 - 5.4.2 Provision for removal of collector
    57 - 5.4.3 Mountings
    57 - 5.4.4 Precautions
    59 - 5.5 INSTALLATION OF CLOSE-COUPLED AND INTEGRAL SOLAR WATER HEATERS
    59 - 5.5.1 General
    59 - 5.5.2 Roof mountings and supports
    59 - 5.6 THERMOSIPHON FLOW SOLAR WATER HEATERS WITH REMOTE CONTAINERS
    59 - 5.6.1 General
    59 - 5.6.2 Primary circuit flow and return pipes-Pipes and fittings
    60 - 5.7 SOLAR WATER HEATERS WITH FORCED PRIMARY CIRCULATION
    60 - 5.7.1 General
    61 - 5.7.2 Primary circulation pump
    61 - 5.7.3 Pump and controller installation
    61 - 5.8 SOLAR WATER HEATERS USED AS PREHEATERS
    61 - 5.8.1 General
    61 - 5.8.2 Installation of solar preheaters-cistern-fed water heaters
    62 - 5.8.3 Installation of solar preheaters-mains pressure and reduced-pressure water heaters
    62 - 5.8.4 Suitable types of existing heaters
    62 - 5.9 MULTIPLE SOLAR WATER HEATERS INSTALLATIONS
    62 - 5.9.1 General
    62 - 5.9.2 Thermosiphon systems-series connection
    62 - 5.10 SUPPLEMENTARY HEATING
    62 - 5.10.1 Thermal capacity
    62 - 5.10.2 Drain connection
    65 - SECTION 6 ENERGY SOURCES AND HEAT RETENTION
    65 - 6.1 SCOPE OF SECTION
    65 - 6.2 CONTROLLED ENERGY SOURCES
    65 - 6.2.1 Electric supply
    65 - 6.2.2 Gas-fired water heater installations
    65 - 6.2.3 Oil-fired water heaters
    65 - 6.3 WATER HEATERS WITH UNCONTROLLED ENERGY SOURCE
    65 - 6.3.1 Installation
    66 - 6.3.2 Supplementary external heating
    66 - 6.3.3 Provision for drainage
    66 - 6.4 ‘Not applicalbe’.
    67 - SECTION 6A ENERGY EFFICIENCY
    67 - 6A.1 SCOPE OF SECTION
    67 - 6A.2 INSULATION
    67 - 6A2.1 General
    67 - 6A.2.2 General piping to be insulated
    67 - 6A.2.3 Hot water system piping
    68 - 6A.2.4 Insulation exposed to the weather
    68 - 6A.3 HEAT TRAPS
    72 - SECTION 7 HOT WATER SERVICES FOR THE DISABLED
    72 - 7.1 SCOPE OF SECTION
    72 - 7.2 GENERAL
    73 - SECTION 8 TESTING AND COMMISSIONING
    73 - 8.1 SCOPE OF SECTION
    73 - 8.2 FLUSHING
    73 - 8.3 TESTING
    73 - 8.4 COMMISSIONING
    73 - 8.5 OPERATING INSTRUCTIONS
    74 - SECTION 9 OPERATION AND MAINTENANCE
    74 - 9.1 SCOPE OF SECTION
    74 - 9.2 GENERAL
    74 - 9.3 MAINTENANCE OF HOT WATER SERVICES
    75 - APPENDIX A - REFERENCED DOCUMENTS
    78 - APPENDIX B - WATER ANALYSIS
    78 - B1 WATER ANALYSIS
    78 - B2 TOTAL DISSOLVED SOLIDS (TDS)
    78 - B3 SCALING PROPERTIES
    78 - B4 WATER pH
    79 - APPENDIX C - TYPICAL RATES OF FLOW
    80 - APPENDIX D - PREFERRED SIZES OF PIPE FOR NON- CIRCULATORY AVERAGE SINGLE-STOREY TYPE HOUSEHOLD INSTALLATIONS
    81 - APPENDIX E - RECOMMENDATIONS FOR THE INSTALLATION OF UNRATED SOLAR HOT WATER SUPPLY SYSTEMS
    81 - E1 GENERAL
    81 - E2 VOLUMETRIC STORAGE CAPACITY
    81 - E3 RECOMMENDED OPERATING TEMPERATURE
    81 - E4 COMBINED TEMPERATURE/PRESSURE RELIEF VALVE
    81 - E5 COLLECTOR/CONTAINER SIZE RATIO
    81 - E5.1 Normal conditions
    81 - E5.2 Non-optimum conditions
    82 - APPENDIX F - RECOMMENDATIONS FOR THE INSTALLATION OF CLOSE-COUPLED AND INTEGRAL SOLAR HOT WATER SYSTEMS ON ROOFS
    82 - F1 GENERAL
    82 - F2 SUPPORT
    82 - F2.1 ‘With pitch’ installations
    82 - F2.2 ‘Against pitch’ installations
    82 - F2.3 ‘Cross pitch’ installations
    82 - F3 POINTS TO NOTE
    85 - APPENDIX G - SOLAR HOT WATER SYSTEMS SUGGESTED COMPONENT SIZES (UNRATED SYSTEMS)
    85 - G1 GENERAL
    85 - G2 ANTICIPATED SOLAR FRACTION
    85 - G3 SOLAR RADIATION DATA
    90 - APPENDIX H - ESTIMATION OF SHADING OF COLLECTORS
    90 - H1 GENERAL
    90 - H2 SUN LOCATER
    91 - H3 APPROXIMATE METHOD OF DETERMINING SOLAR ALTITUDE
    95 - APPENDIX I - EFFECT OF INCLINATION AND ORIENTATION ON SYSTEM PERFORMANCE
    104 - APPENDIX J - MAP OF REGIONAL BASIC DESIGN WIND SPEEDS
    105 - APPENDIX K - AUSTRALIAN CLIMATE REGIONS
    105 - K1 SCOPE
    105 - K2 CLIMATE REGIONS
    108 - APPENDIX L - NEW ZEALAND CLIMATE REGIONS
    108 - L1 SCOPE
    108 - L2 CLIMATE REGIONS
    111 - AMENDMENT CONTROL SHEET

    Abstract - (Show below) - (Hide below)

    Specifies the requirements for the installation of domestic type water heaters using potable water. It includes aspects of the installation from, and including, the valves on the cold water inlet to any cistern or water heater and the downstream fixtures and fittings. The Standard applies to new installations as well as alterations, additions and repairs to existing installations.

    Scope - (Show below) - (Hide below)

    This Standard sets out the requirements for the installation of domestic-type water heaters using potable water. It includes aspects of the installation from, and including, the valve(s) on the cold water inlet to any cistern or water heater and the downstream fixtures and fittings. This Standard applies to new installations as well as alterations, additions and repairs to existing installations.This Standard applies to the installation of the following types of water heaters which comply with Clause 4.2.1 or Clause 5.3.1: (a) Electric storage water heaters with a rated delivery of up to 630 L per heater. (b) Other types of storage water heaters with a capacity of up to 700 L per heater. (c) Heat exchange water heaters in accordance with AS 1361.NOTE: The reference to AS 1361 is made to positively identify the particular type of heat exchange water heater to which this Standard applies.(d) Instantaneous water heaters. (e) Other authorized water heaters.Illustrations used in this Standard are diagrammatic only and have been chosen without prejudice.Construction of hot water supply installations in accordance with this Standard is deemed to satisfy the requirements of AS 3500.4.1 and Clause G12, Water Supplies of the New Zealand Building Code.

    General Product Information - (Show below) - (Hide below)

    Committee WS-014
    Document Type Standard
    Product Note See also AS 3500.4-1994. (In Rul PL/1)
    Publisher Standards Australia
    Status AvailableSuperseded
    Superseded By
    Supersedes
    Under Revision

    History - (Show below) - (Hide below)

    Amendment 1 see DR 01402 CP. Under Revision see DR 03227 CP First published in Australia in part as AS CA51-1968.Revised and redesignated AS 1529-1974.AS 2002 first published 1979.Second edition 1981.Third edition 1987.AS 1529-1974 and AS 2002-1987 revised, amalgamated and redesignated AS 3500.4-1990.Second edition 1994.Jointly revised and redesignated AS/NZS 3500.4.2:1997. Originated in part as AS CA51-1968. Previous edition AS 3500.4-1994. Jointly revised an redesignated AS 3500.4.2:1997. Reissued incorporating Amendment No. 1 (October 2002).

    Standards Referenced By This Book - (Show below) - (Hide below)

    AS 4032-1998 Thermostatic mixing valves - Materials, design and performance requirements
    AS 1428 SUPP 1-1988 Design for access and mobility - Extracts - Design rules for access by the disabled (Supplement to AS 1428-1977)
    AS 1432-1996 Copper tubes for plumbing, gasfitting and drainage applications
    AS 1167.2-1986 Welding and brazing - Filler metals - Filler metal for welding
    AS 2492-1994 Cross-linked polyethylene (PE-X) pipe for hot and cold water applications
    AS 1074-1989 Steel tubes and tubulars for ordinary service (Reconfirmed 2018)
    AS 2813-1985 Solar water heaters - Method of test for thermal performance - Simulator method
    AS 2712-1993 Solar water heaters - Design and construction
    AS 1357.1-1992 Water supply - Valves for use with unvented water heaters - Protection valves
    AS 3498-1995 Authorization requirements for plumbing products - Water heaters and hot-water storage tanks
    AS 3142-1994 Approval and test specification - Electric water heaters
    AS 1056.1-1991 Storage water heaters General requirements
    AS 2239-1993 Galvanic (sacrificial) anodes for cathodic protection
    AS/NZS 3500.1.2:1998 National plumbing and drainage Water supply - Acceptable solutions
    AS 2878-1986 Timber - Classification into strength groups
    AS 1345-1995 Identification of the contents of pipes, conduits and ducts (Reconfirmed 2018)
    AS 1397-1993 Steel sheet and strip - Hot-dipped zinc-coated or aluminium/zinc-coated
    AS 1690-1975 Rules for the safe design, construction and performance of domestic oil-fired appliances (known as the SAA Domestic Oil-fired Appliances Safe Design Code)
    AS 1691-1985 Domestic oil-fired appliances - Installation
    AS 4234-1994 Solar water heaters - Domestic and heat pump - Calculation of energy consumption
    AS 2129-1994 Flanges for pipes, valves and fittings
    AS 1910-1994 Water supply - Float control valves for use in hot and cold water
    AS 3688-1994 Water supply - Copper and copper alloy body compression and capillary fittings and threaded-end connectors
    AS 1566-1997 Copper and copper alloys - Rolled flat products (Reconfirmed 2018)
    AS 1361-1995 Electric heat-exchange water heaters - For domestic applications (Reconfirmed 2016)
    AS/NZS 3500.0:1995 National Plumbing and Drainage Code - Glossary of terms
    AS/NZS 2642.2:1994 Polybutylene pipe systems - Polybutylene (PB) pipe for hot and cold water applications
    AS 1449-1994 Wrought alloy steels - Stainless and heat-resisting steel plate, sheet and strip
    AS/NZS 2280:1999 Ductile iron pressure pipes and fittings
    AS 3000-1986 Electrical installations - Buildings, structures and premises (known as the SAA Wiring Rules) (incorporating Amdt 1)
    AS 1167.1-1993 Welding and brazing - Filler metals - Filler metal for brazing and braze welding
    AS 1722.1-1975 Pipe threads of Whitworth form Sealing pipe threads (metric units)
    AS 2984-1987 Solar water heaters - Method of test for thermal performance - Outdoor test method
    AS/NZS 4331.1:1995 Metallic flanges Steel flanges (Reconfirmed 2020)
    AS 1170.2-1989 Minimum design loads on structures (known as the SAA Loading Code) - Wind loads
    AS/NZS 1260:1999 PVC pipes and fittings for drain, waste and vent applications
    AS 1604-1997 Timber - Preservative-treated - Sawn and round
    AS/NZS 1477:1999 PVC pipes and fittings for pressure applications

    Standards Referencing This Book - (Show below) - (Hide below)

    AS/NZS 4020:2002 Testing of products for use in contact with drinking water
    HB 52-2000 The Bathroom Book
    AS/NZS 3500.1.2:1998 National plumbing and drainage Water supply - Acceptable solutions
    AS 4674-2004 Design, construction and fit-out of food premises
    AS 3500.4.1-1997 National Plumbing and Drainage - Hot water supply systems - Performance requirements
    AS 2050-2002 Installation of roof tiles
    AS 4809-2003 Copper pipe and fittings - Installation and commissioning
    ATS 5200.037.2-2005 Technical Specification for plumbing and drainage products - Flow controllers - For use in heated or cold water plumbing systems
    AS/NZS 3666.1:2002 Air-handling and water systems of buildings - Microbial control - Design, installation and commissioning
    AS/NZS 3718:2005 Water supply - Tap ware (Reconfirmed 2016)
    HB 52-2000 The Bathroom Book
    AS 1056.1-1991 Storage water heaters General requirements
    AS/NZS 3718:2003 Water supply - Tap ware
    AS 1357.2-1998 Valves primarily for use in warm and hot water systems - Control valves
    AS/NZS 3500.5:2000 National Plumbing and Drainage - Domestic installations
    AS 1428.1-2001 Design for access and mobility General requirements for access - New building work
    AS/NZS 3869:1999 Domestic solid fuel burning appliances - Design and construction
    AS/NZS 3666.2:2002 Air-handling and water systems of buildings - Microbial control Operation and maintenance
    AS/NZS 2712:2002 Solar and heat pump water heaters - Design and construction
    AS 3498-2003 Authorization requirements for plumbing products - Water heaters and hot-water storage tanks
    • Access your standards online with a subscription

      Features

      • Simple online access to standards, technical information and regulations
      • Critical updates of standards and customisable alerts and notifications
      • Multi - user online standards collection: secure, flexibile and cost effective