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INSTALLATION – SOLAR STORAGE TANK
HOT WATER DELIVERY
This water heater can deliver water at temperatures which can cause scalding.
It is necessary and we recommend that a temperature limiting device be fitted between the water heater and
the hot water outlets in any ablution and public areas such as a bathroom, ensuite or public amenities, to
reduce the risk of scalding. The installing plumber may have a legal obligation to ensure the installation of
this water heater meets the delivery water temperature requirements of AS/NZS 3500.4 so that scalding
water temperatures are not delivered to a bathroom, ensuite or other ablution or public area.
The temperature limiting device used with a solar water heater should have a specified „minimum
temperature differential‟ between the hot water inlet and the tempered water outlet of no greater than 10°C.
Refer to the specifications of the temperature limiting device.
Where a temperature limiting device is installed adjacent to the solar water heater, the cold water line to the
temperature limiting device can be branched off the cold water line either before or after the isolation valve
and pressure limiting valve to the solar storage tank, but it MUST BE before the non return valve. If an
expansion control valve is required, it must always be installed after the non return valve and be the last
valve prior to the solar storage tank.
Warning: A non return valve MUST BE installed on the cold water line to the solar storage tank AFTER
the cold water branch to a temperature limiting device. Due to the higher water temperatures generated
under certain conditions in the solar collectors of this solar water heater, an additional effective back-flow
prevention device also should be used as an extra safeguard. Valve manufacturer RMC recommends Dual
Check Valve model N7150, as being suitable for this application.
If a combination isolation valve and non return valve (duo or trio valve) is installed on the cold water line to
the solar water heater and the cold water line to the temperature limiting device branches off after this valve,
then a second non return valve must be installed between the cold water branch and the solar storage tank.
Due to the higher water temperatures generated under certain conditions in the solar collectors of this solar
water heater, an effective back-flow prevention device should be used as the second non return valve as an
extra safeguard. Valve manufacturer RMC recommends Dual Check Valve model N7150, as being suitable
for this application.
If a pressure limiting valve is installed on the cold water line to the solar water heater and the cold water line
to a temperature limiting device branches off before this valve or from another cold water line in the
premises, then a pressure limiting valve of an equal pressure setting may be required prior to the
temperature limiting device.
Two Temperature Zones Using a Temperature Limiting Device
LEGEND
23
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