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1.0 Introduction Before you begin Heat pumps have become increasingly popular in New Zealand homes over recent years as they are an energy efficient and convenient way of heating and cooling. By using a relatively small amount of electricity, a heat pump can extract heat energy from one location – typically outdoor air – and transfer it to another location to provide heating. The reverse process can provide cooling. Good design and installation are fundamental to a heat pump system’s effectiveness and efficiency. It involves understanding the importance of correct sizing for the ambient conditions, selecting the right unit for the local environment and correctly installing the unit. This guide provides good practice guidelines for designing and installing the most common type of residential heat pump system – air-to-air single-split heat pump systems (also known as reverse-cycle air conditioners), used primarily for heating. The guide is aimed at experienced installers of heat pumps, and it gives the process to follow for system design and installation into both new and existing homes. Note that this guide does not cover: • multi-split or ducted heat pump systems • ground-to-air, water-to-air or water heating systems • DIY installations – EECA recommends heat pump systems are installed by experienced installers • weathertightness and airtightness of the building envelope and structural integrity (though this must be maintained). Insulate first The first consideration for a house holder when installing a heat pump system into any home is reducing heat loss as much as possible by: • adding ceiling and underfloor insulation where practicable • adding weather stripping to doors and windows • eliminating draughts. Ensure you are qualified and prepared The installation of any heat pump system should be carried out by suitably qualified installers who: • have the correct toolkit to allow them to carry out the work • are licensed to carry out the electrical work • hold a no-loss certification for the handling of refrigerants. Know your standards and regulations Standards and regulations applicable to a heat pump installation that must be complied with include the following: • Building Code Clauses B1 Structure, E2 External moisture and G9 Electricity • AS/NZS 3000:2007 Electrical installations (known as the Australian/New Zealand Wiring Rules) • New Zealand electrical codes of practice • Australia and New Zealand Refrigerant Handling Code of Practice 2007 and standards • Consumer Guarantees Act 1993, which places a legal obligation on the installer to install a system that is suitable for the situation it is installed in • Energy Performance – AS/NZS 3823 units must meet minimum energy performance requirements and have suitable labelling provided. 7PDF Image | Heat pump installation Good Practice Guide
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