CONNECTIONS – PLUMBING
CONNECTION SIZES
• Hot water connection: RP¾/20
• Cold water connection: DN20 compression fitting.
(cold water inlet of tank: RP¾/20).
• Solar hot (from collector) connection: DN15 compression fitting.
(solar hot water inlet of tank: RP¾/20).
• Solar cold (to collector) connection: DN15 compression fitting.
• Relief valve connection: RP½/15.
• Gas inlet: 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 Standard AS/NZS 3500.4 and local authority
requirements.
All gas work must be carried out by a qualified person and in accordance with
the Gas Installations Standard AS 5601 and local authority requirements.
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 used 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 40. Refer also to
“Hot Water Delivery” on page 29 and to “Mains Water Supply” on page 28. The
plumbing arrangements for the solar hot and solar cold pipes are shown on
page 35.
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