Solahart Streamline Gas Owner's Manual page 23

INSTALLATION – SOLAR STORAGE TANK
TANK WATER SUPPLY
If the water heater is supplied with water from a tank supply and a minimum water supply pressure of
200 kPa at the water heater cannot be achieved, then a pressure pump system must be installed to
allow the solar circuit system to operate. Care must be taken to avoid air locks. The cold water line from
the supply tank should be adequately sized and fitted with a full flow gate valve or ball valve.
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.
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.
Two Temperature Zones Using a Temperature Limiting Device
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