AS/NZS 2712:2007
Solar and heat pump water heaters - Design and construction
Provides designers, manufacturers, installers and interested parties with performance-based design and construction requirements for solar and heat pump hot water supply systems.
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AS/NZS 2712:2007 SOLAR AND HEAT PUMP WATER HEATERS-DESIGN AND CONSTRUCTION
PREFACE
CONTENTS
SECTION 1 SCOPE AND GENERAL
1.1 SCOPE
1.2 APPLICATION
1.3 SYSTEMS COVERED BY THIS STANDARD
1.3.1 System types
1.3.2 System configurations
1.3.3 System components
1.3.4 Packaged or factory made systems
1.4 REFERENCED DOCUMENTS
1.5 DEFINITIONS
1.5.1 Absorber
1.5.2 Air-source heat pump water heater
1.5.3 Casing
1.5.4 Close-coupled solar water heater
1.5.5 Collector
1.5.6 Collector aperture
1.5.7 Collector area, gross
1.5.8 Container
1.5.9 Custom-built system
1.5.10 Design life
1.5.11 Heat exchanger, single wall
1.5.12 Heat exchanger, double wall
1.5.13 Integral solar water heater
1.5.14 Packaged system
1.5.15 Shell
1.5.16 Solar-boosted heat pump water heater
1.5.17 Solar water heater (heat-exchange type)
1.5.18 Solar water heater, close-coupled
1.5.19 Solar water heater, integral
1.5.20 Solar preheater
1.5.21 Stagnation temperature
1.5.22 Supplementary heating unit
1.5.23 Unvented water heater
1.5.24 Vented water heater
1.5.25 Volumetric storage capacity of container
SECTION 2 GENERAL DESIGN REQUIREMENTS
2.1 SCOPE OF SECTION
2.2 MATERIALS IN CONTACT WITH DRINKING WATER
2.3 FACILITIES FOR INSTALLATION
2.4 FACILITIES FOR MAINTENANCE
2.5 PIPES
2.6 PRESSURE AND TEMPERATURE PROTECTION
2.6.1 Requirement for protection
2.6.2 Rating of relief valves
2.7 OVER-TEMPERATURE PROTECTION DEVICE
2.8 SUPPLEMENTARY HEATING UNIT
2.9 INSTRUCTIONS
2.9.1 Installation instructions
2.9.2 Operating and maintenance instructions
SECTION 3 CONTAINERS
3.1 SCOPE OF SECTION
3.2 CONSTRUCTION AND PERFORMANCE
3.3 MARKING
SECTION 4 COLLECTORS
4.1 SCOPE OF SECTION
4.2 ABSORBERS
4.2.1 Materials
4.2.2 Fluid ways of absorbers
4.3 COLLECTOR MATERIALS AND CONSTRUCTION
4.3.1 Thermal insulation of collector
4.3.2 Collector casing
4.3.3 Sealing materials
4.3.4 Evacuated tube collectors
4.3.5 Loss of water due to glazing failure
4.4 GLAZING OF COLLECTORS
4.4.1 Securing of glazing
4.4.2 Thickness of flat plate glazing
4.4.3 Glass breakage
4.4.4 Glazing weather resistance
4.5 RESISTANCE TO STAGNATION CONDITIONS
4.5.1 General
4.5.2 Systems with collectors designed to resist stagnation conditions
4.5.3 Systems designed to avoid stagnation conditions
4.6 IMPACT RESISTANCE
4.7 PROTECTION AGAINST INGRESS OF WATER
4.8 PROTECTION AGAINST FREEZING
4.9 STRUCTURAL REQUIREMENTS
4.9.1 Provisions for mounting
4.9.2 Strength
4.10 MARKING
SECTION 5 HEAT EXCHANGERS
5.1 SCOPE OF SECTION
5.2 GENERAL
5.3 HEAT TRANSFER FLUID
5.3.1 Stability
5.3.2 Approvals
5.3.3 Indicator colour
5.3.4 Water as a heat transfer fluid
5.4 DESIGN AND CONSTRUCTION
5.4.1 Materials
5.4.2 Strength of materials
5.4.3 Support
5.4.4 Over-pressure test-Internal
5.4.5 Facilities for drainage and filling
5.4.6 Maintenance of heat transfer fluid level in vented heat exchange systems
5.5 INSTRUCTIONS AND MARKING
5.5.1 General
5.5.2 Pressure information
5.5.3 Leakage indication
5.5.4 Systems with non-toxic heat transfer fluids other than water
5.5.5 Systems with toxic heat transfer fluids
SECTION 6 PUMPS AND CONTROLLERS
6.1 SCOPE OF SECTION
6.2 CIRCULATING PUMP
6.2.1 Construction
6.2.2 Collector circuit flow rate
6.3 CONTROLLERS FOR PUMPS AND SUPPLEMENTARY HEATING
6.3.1 Design
6.3.2 Pump and controller instructions
SECTION 7 SOLAR WATER HEATER SYSTEMS
7.1 SCOPE OF SECTION
7.2 SOLAR HOT WATER SYSTEMS
7.3 AIR VENT
7.4 SYSTEM PERFORMANCE
7.4.1 General
7.4.2 Thermal performance
7.4.3 No-load system operation test
SECTION 8 HEAT PUMP WATER HEATERS
8.1 SCOPE OF SECTION
8.2 SYSTEM PERFORMANCE
8.2.1 General
8.2.2 Thermal performance
8.3 REFRIGERANT
8.3.1 Refrigerant type
8.3.2 Maximum charge of refrigerant
8.4 DESIGN AND CONSTRUCTION
8.4.1 Materials
8.4.2 Over-temperature protection (thermal cut-out)
8.4.3 System pressures and temperature
8.4.4 Circulating pump construction
8.4.5 Controllers for circulating pumps and supplementary heating
8.4.6 Pressure relief
8.4.7 Heat exchangers
8.5 INSTRUCTIONS AND MARKING
8.5.1 Installation instructions
8.5.2 Marking
APPENDIX A - MEANS FOR DEMONSTRATING COMPLIANCE WITH THIS STANDARD
A1 SCOPE
A2 RELEVANCE
A3 PRODUCT CERTIFICATION
A4 DEFINITIONS
A4.1 Batch release test
A4.2 Production batch
A4.3 Sample
A4.4 Sampling plan
A4.5 Test batch
A4.6 Type testing
A4.7 Batch release test
A5 TESTING
A5.1 Type testing
A5.2 Batch release testing
A5.3 Retesting
APPENDIX B - STAGNATION TEST FOR COLLECTOR AND INTEGRAL COLLECTOR AND CONTAINER
B1 SCOPE
B2 APPARATUS
B2.1 Method 1
B2.2 Method 2
B3 TEST CONDITIONS
B4 PROCEDURE
B4.1 Method 1
B4.2 Method 2
B5 TEST REPORT
APPENDIX C - IMPACT TESTS
C1 SCOPE
C1.1 Impact resistance
C1.2 Glass breakage safety
C2 TEST SPECIMEN
C3 IMPACT RESISTANCE TESTS
C3.1 Point of impact
C3.2 Method 1
C3.3 Method 2
C4 IMPACT RESISTANCE TEST REPORT
C5 ASSESSMENT OF GLASS BREAKAGE SAFETY
C5.1 Collector installation
C5.2 Procedure
C6 GLASS BREAKAGE TEST REPORT
APPENDIX D - TEST FOR WATER INGRESS AND RETENTION IN COLLECTOR
D1 SCOPE
D2 APPARATUS
D3 PROCEDURE
D4 TEST REPORT
APPENDIX E - TEST FOR PROTECTION AGAINST FREEZING
E1 SCOPE
E2 APPARATUS
E3 TEST CONDITIONS
E3.1 Method A (with clear sky simulator)
E3.2 Method B (without clear sky simulator)
E4 TEMPERATURE MEASUREMENTS
E4.1 Chamber air temperature
E4.2 Heat sink temperature
E5 PROCEDURE
E6 TEST REPORT
APPENDIX F - NO-LOAD SYSTEM OPERATION TEST
F1 SCOPE
F2 PRINCIPLE
F3 TYPE TESTING
F4 APPARATUS
F5 TEST A
F5.1 General
F5.2 Procedure
F5.3 Test report
F6 CALCULATION OF THERMAL EXPANSION OF TANK CONTENTS
F7 TEST B
F7.1 General
F7.2 Procedure
F7.3 Test report
APPENDIX G - TEST METHOD FOR SOLAR ENERGY TRANSMITTANCE OF SHEET MATERIALS
G1 SCOPE
G2 TEST SPECIMEN
G3 APPARATUS
G4 PROCEDURE
G5 REPORTING OF RESULTS
APPENDIX H
Amendments
Previous versions
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References
Solar heating - Domestic water heating systems - Performance rating procedure using indoor test methods
Cellulose cement products - corrugated sheets for roofing and cladding
Related Information
Building Code Compliance Document G12
Ministry: Ministry of Business, Innovation, and Employment - Building Systems Performance (BSP)
Section: AS2
Citation context:Building Code Compliance Document SH
Ministry: Ministry of Business, Innovation, and Employment - Building Systems Performance (BSP)
Section: AS1
Citation context:Building Code Compliance Document G12
Ministry: Ministry of Business, Innovation, and Employment - Building Systems Performance (BSP)
Section: AS2
Citation context:Refers to 2712:2007(AS/NZS)A1.
Building Code Compliance Document G12
Ministry: Ministry of Business, Innovation, and Employment - Building Systems Performance (BSP)
Section: AS2
Citation context:Refers to 2712:2007(AS/NZS)A2.
Building Code Compliance Document G12
Ministry: Ministry of Business, Innovation, and Employment - Building Systems Performance (BSP)
Section: AS2
Citation context:Refers to 2712:2007(AS/NZS)A3.
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AS/NZS 2712:2007 A1
Solar and heat pump water heaters - Design and construction: Amendment 1 -
AS/NZS 2712:2007 A2
Solar and heat pump water heaters - Design and construction: Amendment 2 -
AS/NZS 2712:2007 A3
Solar and heat pump water heaters - Design and construction: Amendment 3:2014 -
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AS/NZS 2712:2007 SOLAR AND HEAT PUMP WATER HEATERS-DESIGN AND CONSTRUCTION
PREFACE
CONTENTS
SECTION 1 SCOPE AND GENERAL
1.1 SCOPE
1.2 APPLICATION
1.3 SYSTEMS COVERED BY THIS STANDARD
1.3.1 System types
1.3.2 System configurations
1.3.3 System components
1.3.4 Packaged or factory made systems
1.4 REFERENCED DOCUMENTS
1.5 DEFINITIONS
1.5.1 Absorber
1.5.2 Air-source heat pump water heater
1.5.3 Casing
1.5.4 Close-coupled solar water heater
1.5.5 Collector
1.5.6 Collector aperture
1.5.7 Collector area, gross
1.5.8 Container
1.5.9 Custom-built system
1.5.10 Design life
1.5.11 Heat exchanger, single wall
1.5.12 Heat exchanger, double wall
1.5.13 Integral solar water heater
1.5.14 Packaged system
1.5.15 Shell
1.5.16 Solar-boosted heat pump water heater
1.5.17 Solar water heater (heat-exchange type)
1.5.18 Solar water heater, close-coupled
1.5.19 Solar water heater, integral
1.5.20 Solar preheater
1.5.21 Stagnation temperature
1.5.22 Supplementary heating unit
1.5.23 Unvented water heater
1.5.24 Vented water heater
1.5.25 Volumetric storage capacity of container
SECTION 2 GENERAL DESIGN REQUIREMENTS
2.1 SCOPE OF SECTION
2.2 MATERIALS IN CONTACT WITH DRINKING WATER
2.3 FACILITIES FOR INSTALLATION
2.4 FACILITIES FOR MAINTENANCE
2.5 PIPES
2.6 PRESSURE AND TEMPERATURE PROTECTION
2.6.1 Requirement for protection
2.6.2 Rating of relief valves
2.7 OVER-TEMPERATURE PROTECTION DEVICE
2.8 SUPPLEMENTARY HEATING UNIT
2.9 INSTRUCTIONS
2.9.1 Installation instructions
2.9.2 Operating and maintenance instructions
SECTION 3 CONTAINERS
3.1 SCOPE OF SECTION
3.2 CONSTRUCTION AND PERFORMANCE
3.3 MARKING
SECTION 4 COLLECTORS
4.1 SCOPE OF SECTION
4.2 ABSORBERS
4.2.1 Materials
4.2.2 Fluid ways of absorbers
4.3 COLLECTOR MATERIALS AND CONSTRUCTION
4.3.1 Thermal insulation of collector
4.3.2 Collector casing
4.3.3 Sealing materials
4.3.4 Evacuated tube collectors
4.3.5 Loss of water due to glazing failure
4.4 GLAZING OF COLLECTORS
4.4.1 Securing of glazing
4.4.2 Thickness of flat plate glazing
4.4.3 Glass breakage
4.4.4 Glazing weather resistance
4.5 RESISTANCE TO STAGNATION CONDITIONS
4.5.1 General
4.5.2 Systems with collectors designed to resist stagnation conditions
4.5.3 Systems designed to avoid stagnation conditions
4.6 IMPACT RESISTANCE
4.7 PROTECTION AGAINST INGRESS OF WATER
4.8 PROTECTION AGAINST FREEZING
4.9 STRUCTURAL REQUIREMENTS
4.9.1 Provisions for mounting
4.9.2 Strength
4.10 MARKING
SECTION 5 HEAT EXCHANGERS
5.1 SCOPE OF SECTION
5.2 GENERAL
5.3 HEAT TRANSFER FLUID
5.3.1 Stability
5.3.2 Approvals
5.3.3 Indicator colour
5.3.4 Water as a heat transfer fluid
5.4 DESIGN AND CONSTRUCTION
5.4.1 Materials
5.4.2 Strength of materials
5.4.3 Support
5.4.4 Over-pressure test-Internal
5.4.5 Facilities for drainage and filling
5.4.6 Maintenance of heat transfer fluid level in vented heat exchange systems
5.5 INSTRUCTIONS AND MARKING
5.5.1 General
5.5.2 Pressure information
5.5.3 Leakage indication
5.5.4 Systems with non-toxic heat transfer fluids other than water
5.5.5 Systems with toxic heat transfer fluids
SECTION 6 PUMPS AND CONTROLLERS
6.1 SCOPE OF SECTION
6.2 CIRCULATING PUMP
6.2.1 Construction
6.2.2 Collector circuit flow rate
6.3 CONTROLLERS FOR PUMPS AND SUPPLEMENTARY HEATING
6.3.1 Design
6.3.2 Pump and controller instructions
SECTION 7 SOLAR WATER HEATER SYSTEMS
7.1 SCOPE OF SECTION
7.2 SOLAR HOT WATER SYSTEMS
7.3 AIR VENT
7.4 SYSTEM PERFORMANCE
7.4.1 General
7.4.2 Thermal performance
7.4.3 No-load system operation test
SECTION 8 HEAT PUMP WATER HEATERS
8.1 SCOPE OF SECTION
8.2 SYSTEM PERFORMANCE
8.2.1 General
8.2.2 Thermal performance
8.3 REFRIGERANT
8.3.1 Refrigerant type
8.3.2 Maximum charge of refrigerant
8.4 DESIGN AND CONSTRUCTION
8.4.1 Materials
8.4.2 Over-temperature protection (thermal cut-out)
8.4.3 System pressures and temperature
8.4.4 Circulating pump construction
8.4.5 Controllers for circulating pumps and supplementary heating
8.4.6 Pressure relief
8.4.7 Heat exchangers
8.5 INSTRUCTIONS AND MARKING
8.5.1 Installation instructions
8.5.2 Marking
APPENDIX A - MEANS FOR DEMONSTRATING COMPLIANCE WITH THIS STANDARD
A1 SCOPE
A2 RELEVANCE
A3 PRODUCT CERTIFICATION
A4 DEFINITIONS
A4.1 Batch release test
A4.2 Production batch
A4.3 Sample
A4.4 Sampling plan
A4.5 Test batch
A4.6 Type testing
A4.7 Batch release test
A5 TESTING
A5.1 Type testing
A5.2 Batch release testing
A5.3 Retesting
APPENDIX B - STAGNATION TEST FOR COLLECTOR AND INTEGRAL COLLECTOR AND CONTAINER
B1 SCOPE
B2 APPARATUS
B2.1 Method 1
B2.2 Method 2
B3 TEST CONDITIONS
B4 PROCEDURE
B4.1 Method 1
B4.2 Method 2
B5 TEST REPORT
APPENDIX C - IMPACT TESTS
C1 SCOPE
C1.1 Impact resistance
C1.2 Glass breakage safety
C2 TEST SPECIMEN
C3 IMPACT RESISTANCE TESTS
C3.1 Point of impact
C3.2 Method 1
C3.3 Method 2
C4 IMPACT RESISTANCE TEST REPORT
C5 ASSESSMENT OF GLASS BREAKAGE SAFETY
C5.1 Collector installation
C5.2 Procedure
C6 GLASS BREAKAGE TEST REPORT
APPENDIX D - TEST FOR WATER INGRESS AND RETENTION IN COLLECTOR
D1 SCOPE
D2 APPARATUS
D3 PROCEDURE
D4 TEST REPORT
APPENDIX E - TEST FOR PROTECTION AGAINST FREEZING
E1 SCOPE
E2 APPARATUS
E3 TEST CONDITIONS
E3.1 Method A (with clear sky simulator)
E3.2 Method B (without clear sky simulator)
E4 TEMPERATURE MEASUREMENTS
E4.1 Chamber air temperature
E4.2 Heat sink temperature
E5 PROCEDURE
E6 TEST REPORT
APPENDIX F - NO-LOAD SYSTEM OPERATION TEST
F1 SCOPE
F2 PRINCIPLE
F3 TYPE TESTING
F4 APPARATUS
F5 TEST A
F5.1 General
F5.2 Procedure
F5.3 Test report
F6 CALCULATION OF THERMAL EXPANSION OF TANK CONTENTS
F7 TEST B
F7.1 General
F7.2 Procedure
F7.3 Test report
APPENDIX G - TEST METHOD FOR SOLAR ENERGY TRANSMITTANCE OF SHEET MATERIALS
G1 SCOPE
G2 TEST SPECIMEN
G3 APPARATUS
G4 PROCEDURE
G5 REPORTING OF RESULTS
APPENDIX H
Amendments
Previous versions
AS/NZS 2712:2007
Online Library subscription pricing
The cost of your subscription will depend on which standards you want to access, and how many people in your organisation need to be able to access the Online Library subscription at the same time (concurrent users). During your subscription period, we are also able to make any necessary changes and ensure you are aware of any pricing changes that result. For a quote, contact our Online Library team by emailing onlinelibrary@standards.govt.nz.