Thursday, September 6, 2007

Code of Practice for manufacture and installation of solar water heating systems in New Zealand

Code of Practice for Manufacture and Installation of Solar Water Heating Systems in New Zealand
Version: 1 October 2004 (Revision 3)
Here are some key extracts from this document that are relevant to the issues raised on this website:

Photo: Beasley Centurion 315 (From Reid Technology) Installed May 2006. Note condensation inside glass.

The collector shall be made from materials which in their application to the collector shall meet with the requirements of the New Zealand Building Code Approved Document B2.

Materials exposed to the weather shall be capable of withstanding the commonly encountered conditions such as solar radiation at the intensities normally encountered at the installation site, maximum and minimum temperatures at the installation site, and rain. The collectors shall

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withstand snow loadings likely to be encountered. Collectors shall be capable of withstanding impact by hail up to the sizes commonly encountered at the installation site.

Collector insulation shall not absorb moisture.

Materials of construction of the collector (including the absorber) shall not degrade under the
conditions met in normal operation. Nor should they become damaged or degraded under repeated stagnation.

For direct collectors, components of the absorber which come in contact with potable water
shall comply with the requirements of the NZ Building Code, Approved Document G12 and of AS/NZS 4020.

Collectors shall be constructed to meet the requirements of Section 4 of AS/NZS 2712.
Gary Moller comments:
There are numerous examples of solar water heating systems on this website that do comply with AS/NZS 2712. It is time for a rewrite of the Standard and there should be a product recall.

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