CONNECTIONS – PLUMBING
57
A disconnection union must always be provided at the cold water inlet and hot water outlet of the solar storage
tank to allow for disconnection of the solar storage tank.
The pipe work from the hot water outlet must not be installed in front of or prevent access to the electrical
cover of the solar storage tank.
This water heater is intended to be permanently connected to the water mains and not connected by a hose-
set. A braided flexible hose or semi-flexible connector may be used for connection to the water heater, where
permitted by AS/NZS 3500.4.
Pipes must not be installed in direct contact with metal roofs. Where it is necessary to run piping across a
metal roof, it must be fixed above the roof and surrounded with weatherproof insulation of a minimum thickness
given in AS/NZS 3500.4. The insulation must be UV resistant if exposed. The insulation is to assist in freeze
protection and to protect the metal roof against corrosion by water runoff over the copper pipe. Consideration
should be made for thermal expansion and contraction of the roof material.
Exposed pipe work between the solar storage tank and the penetrations through the roofing material should
be kept to a minimum to maintain the aesthetics of the installation.
Notes:
• Penetrations through the roofing material must be:
◼ at the high point of the roof tile or metal sheet;
◼ made neatly and kept as small as practicable;
◼ waterproofed upon installation of the hot and cold pipes.
PIPE SIZES
To achieve true mains pressure operation, the cold water line to the water heater should be the same size or
bigger than the hot water line from the water heater.
The pipe sizing for hot water supply systems should be carried out by persons competent to do so, choosing
the most suitable pipe size for each individual application. Reference to the technical specifications of the water
heater and local regulatory authority requirements must be made.
Pipe work, including that within the roof space, is to be securely fixed to prevent vibration.
IN-SERIES BOOSTER (IF INSTALLED)
The pipe work between the solar storage tank and an in-series booster has a minimum recommended pipe
size of DN20, MUST BE of copper and be fully insulated with a closed cell type insulation or equivalent and in
accordance with the requirements of AS/NZS 3500.4.
The insulation must be weatherproof and UV resistant if exposed. The insulation must be fitted up to the
connections on both the solar storage tank and the in-series booster.
An isolation valve may be installed on the water line to the in-series booster. The isolation valve must be of a
full flow type if the in-series booster is a continuous flow water heater.
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