Rheem Solar Hiline 52D180 Owner's Manual And Installation Instructions page 21

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 area such as a bathroom or ensuite, 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 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.
Two Temperature Zones Using a Temperature Limiting Device
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.
LEGEND
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.
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