Leda 270 Installation And Owner's Manual - The Gas Booster
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For this reason it is important to understand that the switch for the electric booster element
should be left continuously in the ‘On’ position so the automatic thermostat can control the
water temperature in the upper portion of the tank leaving the lower portion available for
solar heating. Not only does this comply with the Australian Standard, it also ensures a
reliable supply of hot water.
Electric boosted systems can be connected to an
Off Peak Tariff
if desired however a
“Night Rate Only” tariff is not recommended. “Night Rate Only” tariffs do not supply
electricity during daylight hours and solar water heaters connected to these tariffs can run
short of hot water during periods of inclement weather. For systems connected to a
continuous tariff, it is possible to install a time switch provided the availability of electrical
power is sufficient to comply with the provisions of AS 3498-‐2009 as outlined above.
The gas booster
The LEDA 6 Star rated continuous flow gas boosters come in two sizes, i.e. 20 litres per
minute and 26 litres per minute, and also in two models, i.e. Natural Gas and LP Gas. Please
contact your LEDA representative for further information.
The gas booster comes with its own separate manual. Please consult that manual for
technical specifications and maintenance requirements. Take particular notice of required
clearances and ventilation requirements.
A gas boosted storage tank does not have provision for an electric heating element so the
water in the storage tank is pre-‐heated by solar energy. Consequently, the minimum water
temperature in the storage tank is not controlled so, to comply with the provisions of
Australian Standard AS 3498-‐2009, the thermostat of the gas booster is factory-‐set at 75
o
C
and must not be adjusted from that setting.
When a hot tap is turned on in the home, solar pre-‐heated water flows to the cold inlet of
the gas booster. A series of sensors measure the incoming water temperature and if the
incoming water is up to temperature, the gas booster does not ignite and the hot water
flows through to the tempering valve (refer to “Valves” below for further details).
If the incoming water is below the thermostat setting, the sensors cause the gas booster to
ignite and the water is heated to 75
o
C, instantly killing any bacteria that may be present.
This type of system also provides an endless supply of hot water.