Specifications
38
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.
All gas work must be carried out by a qualified person and in compliance with the Standard AS 5601 or
AS/NZS 5601.1, as applicable under local regulations, and all local codes and regulatory authority
requirements.
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 27.
CONNECTION SIZES
Hot water connection to in-series gas booster: R 3/4.
Solar heated water connection to in-series gas booster: R 3/4.
Solar heated water connection to solar storage tank: Rp 3/4.
Cold water connection: Rp 3/4.
Solar hot (from collector) connection: DN15 compression fitting.
Solar cold (to collector) connection: DN15 compression fitting.
Temperature Pressure Relief valve connection: Rp 1/2.
Solar circuit pressure relief valve connection: R 1/2.
Gas connection: R 3/4.
WATER INLET AND OUTLETS
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 fittings.
An isolation valve and non return valve must be installed
on the cold water line to the water heater. An acceptable
arrangement is shown in the diagram. Refer also to “Hot
Water Delivery” on page 26 and to “Mains Water Supply”
on page 24.
A disconnection union must always be provided at the cold water inlet and hot water outlet on the water
heater to allow for disconnection of the water heater.
The plumbing arrangements for the solar heated water outlet of the solar
storage tank and the water inlet of a tank mounted in-series gas booster
are shown on page 39. The solar hot and solar cold pipe connections are
shown on page 42.
This solar storage tank has either a plastic dip tube or fitting liner in the
inlet and outlet fittings (see diagram). These must be in place for the water
heater to function properly. Do not remove or damage them by using heat
nearby. They will be pushed into the correct position as the fitting is
screwed in.