AS/NZS 2712:2002
Solar and heat pump water heaters - Design and construction
Specifies requirements for the design and construction of solar and heat pump hot water supply systems and/or components for household premises and for commercial and industrial installations comparable with household installations, intended to deliver potable water of acceptable quality. Covers systems with storage capacity up to and including 700 litres. Reprinted to incorporate Amendment 1:2005.
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AS/NZS 2712:2002 SOLAR AND HEAT PUMP WATER HEATERS-DESIGN AND CONSTRUCTION
PREFACE
CONTENTS
SECTION 1 SCOPE AND GENERAL
1.1 SCOPE
1.2 APPLICATION
1.3 REFERENCED DOCUMENTS
1.4 DEFINITIONS
1.4.1 Absorber
1.4.2 Casing
1.4.3 Collector
1.4.4 Collector aperture
1.4.5 Container
1.4.6 Displacement water heater
1.4.7 Shell
1.4.8 Solar water heater (household)
1.4.9 Solar preheater
1.4.10 Stagnation temperature
1.4.11 Supplementary heating unit
1.4.12 Unvented water heater
1.4.13 Vented water heater
1.4.14 Volumetric storage capacity of container
1.4.15 Solar water heater (heat-exchange type)
1.4.16 Heat exchanger, single wall
1.4.17 Heat exchanger, double wall
1.4.18 Solar-boosted heat pump water heater
1.4.19 Air source heat pump water heater
1.5 COMPLIANCE WITH OTHER SPECIFICATIONS
1.5.1 Electrical safety requirements
1.5.2 Gas approval requirements
1.5.3 Water approval requirements
1.6 SYSTEM PERFORMANCE
1.6.1 Thermal performance
1.6.2 No load system performance test
1.7 FACILITIES FOR MAINTENANCE
1.8 SYSTEMS WITH PRIMARY CIRCULATION
1.9 WATER PIPES
1.10 PRESSURE- AND TEMPERATURE-RELIEF VALVES
1.11 OVER-TEMPERATURE PROTECTIVE DEVICE
1.12 HEAT EXCHANGER UNITS
1.13 MATERIALS IN CONTACT WITH WATER
1.14 INSTRUCTIONS AND MARKING
1.14.1 Installation instructions
1.14.2 Maintenance instructions
1.14.3 Marking
SECTION 2 SUPPLEMENTARY ENERGY REQUIREMENTS
2.1 SUPPLEMENTARY HEATING UNIT
2.2 THERMOSTAT
2.2.1 Systems with electric supplementary heating
2.2.2 Systems with gas supplementary heating
2.2.3 Immersed-probe thermostats
2.2.4 Surface-contact thermostats
SECTION 3 CONTAINER
3.1 SHELL
3.1.1 Requirements
3.1.2 Fixing of electric heating units to shell
3.1.3 Fittings for tanks requiring anode protection
3.2 SACRIFICIAL ANODES
3.3 THERMAL INSULATION OF THE CONTAINER
3.4 CASING
3.5 ATTACHED FEED TANK
3.6 DRAIN HOLE
3.7 PROTECTION AGAINST INGRESS OF WATER
SECTION 4 COLLECTORS
4.1 MATERIALS
4.1.1 Absorber
4.1.2 Absorber tubing
4.1.3 Thermal insulation of collector
4.1.4 Collector casing
4.1.5 Polymeric glazing material
4.2 BONDING OF ABSORBER TUBING
4.3 PAINTED ABSORBER SURFACES
4.4 GLAZING OF COLLECTORS
4.5 STAGNATION
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 DRAIN HOLES
4.9 AIR VENT
4.10 PROTECTION AGAINST FREEZING
4.11 STRUCTURAL STRENGTH
SECTION 5 HEAT PUMP WATER HEATERS
5.1 SCOPE
5.2 REFRIGERANT
5.2.1 Refrigerant type
5.2.2 Maximum charge of refrigerant
5.3 DESIGN AND CONSTRUCTION
5.3.1 Material
5.3.2 Strength
5.3.3 Pressure relief
5.3.4 Heat exchangers
5.3.5 Pipes, tubes and pipe fittings
5.3.6 Noise level
5.4 MARKING AND INSTRUCTION
5.4.1 Marking
5.4.2 Installation instruction
5.5 TESTING
SECTION 6 TESTING
6.1 ROUTINE TESTING
6.2 TYPE TESTING
6.2.1 List of type tests
6.2.2 Test samples
6.2.3 Pressure test
6.2.4 Pressure fatigue test on unvented systems
6.2.5 Torque test on fittings
6.2.6 Tests of physical properties of shells and linings
APPENDIX A - REQUIREMENTS FOR HEAT EXCHANGE UNITS
A1 SCOPE
A2 HEAT TRANSFER FLUIDS OTHER THAN WATER
A2.1 Indicator colour
A2.2 Stability
A2.3 Approvals
A3 HEAT EXCHANGER
A3.1 Use of heat transfer fluids
A3.2 Design
A3.3 Materials
A3.4 Support
A3.5 Joints
A3.6 Strength of materials
A3.7 Over-pressure test-Internal
A3.8 Cleanness of the closed circuit
A3.9 Facilities for drainage and filling
A4 MAINTENANCE OF HEAT TRANSFER FLUID LEVEL (VENTED HEAT EXCHANGE SYSTEMS)
A5 MARKING
APPENDIX B - STAGNATION TEST FOR COLLECTORS AND INTEGRAL COLLECTOR AND CONTAINER
B1 SCOPE
B2 APPARATUS
B2.1 Method 1 (not for use with collectors with heat pipes)
B2.2 Method 2
B3 PROCEDURE
B3.1 Method 1 (not for use with collectors with heat pipes)
B3.2 Method 2
B4 REPORTING OF RESULTS
APPENDIX C - IMPACT RESISTANCE TEST
C1 SCOPE
C2 TEST SPECIMEN
C3 APPARATUS
C4 PROCEDURE
C5 REPORTING OF RESULTS
APPENDIX D - TEST FOR WATER INGRESS AND RETENTION IN COLLECTORS
D1 SCOPE
D2 APPARATUS
D3 PROCEDURE
D4 REPORTING OF RESULTS
APPENDIX E - TEST FOR PROTECTION AGAINST FREEZING
E1 SCOPE
E2 PRINCIPLE
E3 APPARATUS
E4 TEST CONDITIONS
E5 TEMPERATURE MEASUREMENTS
E5.1 Chamber air temperature
E5.2 Heat sink temperature
E6 PROCEDURE
E7 INSPECTION AND REPORT
APPENDIX F - METHOD FOR DETERMINATION OF TANK HEAT LOSS FROM RAISED ELEMENT TANKS
F1 SCOPE
F2 PRINCIPLE
F3 TEST APPARATUS
F4 TEST CONDITIONS
F4.1 Insulation of fittings
F4.2 Air temperature
F4.3 Air circulation
F4.4 Thermostat setting
F5 PROCEDURE
F6 CALCULATIONS AND REPORTING
APPENDIX G - NO-LOAD SYSTEM PERFORMANCE TEST
G1 GENERAL
G2 PURPOSE
G3 TYPE TESTING
G4 APPARATUS
G5 TEST A
G5.1 General
G5.2 Procedure
G5.3 Test report
G6 CALCULATION OF THERMAL EXPANSION OF TANK CONTENTS
G7 TEST B
G7.1 General
G7.2 Procedure
G7.3 Test report
Amendments
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References
Test methods for solar collectors - Thermal performance of glazed liquid heating collectors including pressure drop
Safety of household and similar electrical appliances - Particular requirements - Electrical heat pumps, air-conditioners and dehumidifiers
Related Information
Similar Standards
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AS/NZS 2712:2007
Solar and heat pump water heaters - Design and construction
-
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
AS/NZS 2712:2002 SOLAR AND HEAT PUMP WATER HEATERS-DESIGN AND CONSTRUCTION
PREFACE
CONTENTS
SECTION 1 SCOPE AND GENERAL
1.1 SCOPE
1.2 APPLICATION
1.3 REFERENCED DOCUMENTS
1.4 DEFINITIONS
1.4.1 Absorber
1.4.2 Casing
1.4.3 Collector
1.4.4 Collector aperture
1.4.5 Container
1.4.6 Displacement water heater
1.4.7 Shell
1.4.8 Solar water heater (household)
1.4.9 Solar preheater
1.4.10 Stagnation temperature
1.4.11 Supplementary heating unit
1.4.12 Unvented water heater
1.4.13 Vented water heater
1.4.14 Volumetric storage capacity of container
1.4.15 Solar water heater (heat-exchange type)
1.4.16 Heat exchanger, single wall
1.4.17 Heat exchanger, double wall
1.4.18 Solar-boosted heat pump water heater
1.4.19 Air source heat pump water heater
1.5 COMPLIANCE WITH OTHER SPECIFICATIONS
1.5.1 Electrical safety requirements
1.5.2 Gas approval requirements
1.5.3 Water approval requirements
1.6 SYSTEM PERFORMANCE
1.6.1 Thermal performance
1.6.2 No load system performance test
1.7 FACILITIES FOR MAINTENANCE
1.8 SYSTEMS WITH PRIMARY CIRCULATION
1.9 WATER PIPES
1.10 PRESSURE- AND TEMPERATURE-RELIEF VALVES
1.11 OVER-TEMPERATURE PROTECTIVE DEVICE
1.12 HEAT EXCHANGER UNITS
1.13 MATERIALS IN CONTACT WITH WATER
1.14 INSTRUCTIONS AND MARKING
1.14.1 Installation instructions
1.14.2 Maintenance instructions
1.14.3 Marking
SECTION 2 SUPPLEMENTARY ENERGY REQUIREMENTS
2.1 SUPPLEMENTARY HEATING UNIT
2.2 THERMOSTAT
2.2.1 Systems with electric supplementary heating
2.2.2 Systems with gas supplementary heating
2.2.3 Immersed-probe thermostats
2.2.4 Surface-contact thermostats
SECTION 3 CONTAINER
3.1 SHELL
3.1.1 Requirements
3.1.2 Fixing of electric heating units to shell
3.1.3 Fittings for tanks requiring anode protection
3.2 SACRIFICIAL ANODES
3.3 THERMAL INSULATION OF THE CONTAINER
3.4 CASING
3.5 ATTACHED FEED TANK
3.6 DRAIN HOLE
3.7 PROTECTION AGAINST INGRESS OF WATER
SECTION 4 COLLECTORS
4.1 MATERIALS
4.1.1 Absorber
4.1.2 Absorber tubing
4.1.3 Thermal insulation of collector
4.1.4 Collector casing
4.1.5 Polymeric glazing material
4.2 BONDING OF ABSORBER TUBING
4.3 PAINTED ABSORBER SURFACES
4.4 GLAZING OF COLLECTORS
4.5 STAGNATION
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 DRAIN HOLES
4.9 AIR VENT
4.10 PROTECTION AGAINST FREEZING
4.11 STRUCTURAL STRENGTH
SECTION 5 HEAT PUMP WATER HEATERS
5.1 SCOPE
5.2 REFRIGERANT
5.2.1 Refrigerant type
5.2.2 Maximum charge of refrigerant
5.3 DESIGN AND CONSTRUCTION
5.3.1 Material
5.3.2 Strength
5.3.3 Pressure relief
5.3.4 Heat exchangers
5.3.5 Pipes, tubes and pipe fittings
5.3.6 Noise level
5.4 MARKING AND INSTRUCTION
5.4.1 Marking
5.4.2 Installation instruction
5.5 TESTING
SECTION 6 TESTING
6.1 ROUTINE TESTING
6.2 TYPE TESTING
6.2.1 List of type tests
6.2.2 Test samples
6.2.3 Pressure test
6.2.4 Pressure fatigue test on unvented systems
6.2.5 Torque test on fittings
6.2.6 Tests of physical properties of shells and linings
APPENDIX A - REQUIREMENTS FOR HEAT EXCHANGE UNITS
A1 SCOPE
A2 HEAT TRANSFER FLUIDS OTHER THAN WATER
A2.1 Indicator colour
A2.2 Stability
A2.3 Approvals
A3 HEAT EXCHANGER
A3.1 Use of heat transfer fluids
A3.2 Design
A3.3 Materials
A3.4 Support
A3.5 Joints
A3.6 Strength of materials
A3.7 Over-pressure test-Internal
A3.8 Cleanness of the closed circuit
A3.9 Facilities for drainage and filling
A4 MAINTENANCE OF HEAT TRANSFER FLUID LEVEL (VENTED HEAT EXCHANGE SYSTEMS)
A5 MARKING
APPENDIX B - STAGNATION TEST FOR COLLECTORS AND INTEGRAL COLLECTOR AND CONTAINER
B1 SCOPE
B2 APPARATUS
B2.1 Method 1 (not for use with collectors with heat pipes)
B2.2 Method 2
B3 PROCEDURE
B3.1 Method 1 (not for use with collectors with heat pipes)
B3.2 Method 2
B4 REPORTING OF RESULTS
APPENDIX C - IMPACT RESISTANCE TEST
C1 SCOPE
C2 TEST SPECIMEN
C3 APPARATUS
C4 PROCEDURE
C5 REPORTING OF RESULTS
APPENDIX D - TEST FOR WATER INGRESS AND RETENTION IN COLLECTORS
D1 SCOPE
D2 APPARATUS
D3 PROCEDURE
D4 REPORTING OF RESULTS
APPENDIX E - TEST FOR PROTECTION AGAINST FREEZING
E1 SCOPE
E2 PRINCIPLE
E3 APPARATUS
E4 TEST CONDITIONS
E5 TEMPERATURE MEASUREMENTS
E5.1 Chamber air temperature
E5.2 Heat sink temperature
E6 PROCEDURE
E7 INSPECTION AND REPORT
APPENDIX F - METHOD FOR DETERMINATION OF TANK HEAT LOSS FROM RAISED ELEMENT TANKS
F1 SCOPE
F2 PRINCIPLE
F3 TEST APPARATUS
F4 TEST CONDITIONS
F4.1 Insulation of fittings
F4.2 Air temperature
F4.3 Air circulation
F4.4 Thermostat setting
F5 PROCEDURE
F6 CALCULATIONS AND REPORTING
APPENDIX G - NO-LOAD SYSTEM PERFORMANCE TEST
G1 GENERAL
G2 PURPOSE
G3 TYPE TESTING
G4 APPARATUS
G5 TEST A
G5.1 General
G5.2 Procedure
G5.3 Test report
G6 CALCULATION OF THERMAL EXPANSION OF TANK CONTENTS
G7 TEST B
G7.1 General
G7.2 Procedure
G7.3 Test report
Amendments
AS/NZS 2712:2002
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.