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CONNECTIONS – PLUMBING
CONNECTION SIZES
• Hot water connection: RP¾/20.
• Cold water connection: RP½/15.
(cold water inlet to tank: 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.
• Relief valve connection: RP½/15.
• Bleed valve connection: G1.0B.
All plumbing work must be carried out by a qualified person and in accordance with the National
Plumbing Code AS/NZS 3500.4 and local authority requirements.
Note: The 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
bypass the solar water heater and install a secondary water heater supplied from the solar water heater
and connected to the hot water flow and return line.
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 fittings.
An isolation valve and non return valve must be installed on the cold water line to the water heater. Use
the arrangement shown in the diagram. Refer also to
“Hot Water Delivery” on page 19.
OR
The plumbing arrangements for the cold water inlet and solar hot and solar cold pipes are shown on
page
25.
A disconnection union must always be provided at the cold water inlet, solar hot water inlet and hot
water outlet on the water heater to allow for disconnection of the water heater.