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INSTALLATION – WATER HEATER
50
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 direct 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 indirect 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 direct system. Due to the higher
water temperatures generated under certain conditions in the solar collectors of an open circuit direct 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 an
open circuit direct 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 an open circuit direct pumped 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.
In-series Gas Booster as part of a Open Circuit Direct Solar Water Heater Installation
Two Temperature Zones Using a Temperature Limiting Device
In-series Gas Booster as part of a Closed Circuit Indirect 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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