Specifications

42
CONNECTIONS – PLUMBING
All plumbing work must be carried out by a qualified person and in accordance with the requirements of the
Standard AS/NZS 3500.4, and all local codes and regulatory authority requirements. In New Zealand, the
installation must conform with Clause G12 of the New Zealand Building Code.
Warning: Certain types of plastic pipe, such as Poly-butylene pipe, are not suitable to be used as a hot
water pipe between:
this water heater and a temperature limiting device, and
this water heater and a hot water outlet if a temperature limiting device is not installed.
This water heater can produce water at a temperature and pressure which can exceed the performance
limits of these types of pipe. This may result in pipe failure leading to severe water damage to the property. If
one of these types of plastic pipe is used as a hot water pipe in the property, then a temperature limiting
device must be installed between the water heater and this pipe work.
Note: The solar storage tank of a solar water heater should not be installed as part of a circulated hot water
flow and return system in a building. The benefits of solar gain will be significantly reduced and energy
gained from the sun lost through the pipe work. If a circulated flow and return system is required, it is
necessary to connect the return line after the solar storage tank and prior to the in-series water heater
supplied from the solar water heater. Refer to “Circulated Hot Water Flow and Return System” on page 28.
CONNECTION SIZES
Hot water connection: RP¾/20.
Cold water connection: RP¾/20.
Solar hot (from collector) connection: DN15 compression fitting.
(solar hot inlet to tank: RP¾/20).
Solar cold (to collector) connection: DN15 compression fitting.
(solar cold outlet from tank: RP¾/20).
Relief valve connection: RP½/15.
Bleed valve connection: G1.0B.
WATER INLET AND OUTLET
All pipe work must be cleared of foreign matter before connection and purged before attempting to operate
the water heater. All olive compression fittings must use brass or copper olives. Use thread sealing tape or
approved thread sealant on all other fittings.
An isolation valve and non return valve must be installed on the cold water line to the water heater. A non-
return valve must be fitted on the cold water supply to this water heater in compliance with Clause 5.9.1 of
AS/NZS 3500.4. Due to the higher temperatures generated by solar water heaters, an additional effective
back-flow prevention device also should be fitted as an extra safeguard. Valve manufacturer RMC
recommends Dual Check Valve No N7150, as being suitable for this application.
An acceptable arrangement is shown in the diagram on page 42. Refer also to “Hot Water Delivery” on
page 26 and to “Mains Water Supply” on page 25. The plumbing arrangements for the cold water inlet and
solar hot and solar cold pipes are shown on page 35.
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