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INSTALLATION – WATER HEATER
54
Where a temperature limiting device is installed adjacent to the in-series gas booster, 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 prior to an
open circuit system. The cold water line to the temperature limiting device can be branched off the cold water
line either before or after the non-return valve prior to a closed circuit system. 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 prior to an open circuit system.
If a combination isolation valve and non-return valve (duo or trio valve) is installed on the cold water line to an
open circuit 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.
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.
Refer to the installation instructions supplied with the solar storage tank for further information on the
installation of the cold water valves in the cold supply pipework prior to the solar storage tank.
In-series Gas Booster as part of an Open Circuit Solar Water Heater Installation
Two Temperature Zones Using a Temperature Limiting Device
In-series Gas Booster as part of a Closed Circuit Solar Water Heater Installation
Two Temperature Zones Using a Temperature Limiting Device
from solar
storage tank
to solar
storage tank
from solar
storage tank
to solar
storage tank
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