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PRECAUTIONS
Where damage to property can occur in the event of the water heater leaking, the water heater must be
installed in a safe tray. Construction, installation and draining of a safe tray must comply with AS/NZS 3500.4
and all local codes and regulatory authority requirements.
The water heater must be maintained in accordance with the Owner‟s Guide and Installation Instructions.
"Regular Care"
Refer to
If this water heater is to be used where an uninterrupted hot water supply is necessary for your application or
business you should ensure that you have back up redundancy within the hot water system design. This
should ensure the continuity of hot water supply in the event that this water heater were to become
inoperable for any reason. We recommend you seek advice from your plumber or specifier about your needs
and building back up redundancy into your hot water supply system.
TEMPERATURE RUN DOWN
Temperature run down is the reduction in water temperature as the hotter water at the top of the storage
cylinder transfers some of its heat to the cooler water in the lower section of the cylinder.
This effect is often perceived as heat loss, but is actually the redistribution of stored heat more evenly over
the entire contents of the storage tank. This heat is not lost to the system. This may make it necessary to use
the booster to raise the water in the top section of the cylinder back to an acceptable temperature.
Over-night temperature run down is most evident in the morning if the booster switch or time clock is left OFF
over-night. It is more prevalent the more hot water is used the night before and also in the cooler months.
Day time temperature run down is quite evident on days of lower solar radiation particularly during the cooler
months if the power to the booster heating element is not available, or the booster switch or time clock is left
OFF.
If higher temperature water is required, particularly in the morning, then use of the booster heating unit is
necessary to raise the temperature of the water in the top section of the cylinder. Refer to
on page 7.
BOOSTER CONTROL
An isolating switch is installed in the electrical meter box for the solar storage tank. This should be left
switched on to allow the booster heating unit to operate if required. The booster heating unit is for heating
the water at times of low solar energy gain, such as during very cloudy or rainy weather, or during the colder
months.
The booster heating unit will only activate if heating is required and power is available from the switchboard.
When the water is below the thermostat setting, the booster heating unit will turn on and heat the water. The
booster heating unit will automatically turn off when the temperature of the water reaches the thermostat
setting.
Leaving the isolating switch switched on will also provide a sufficient period of time each day for the booster
heating unit to operate, if required, to satisfy the requirements of AS 3498.
The amount of water heated by the raised booster heating unit of the thermosiphon solar storage tank will be
90 litres (180 tank) or 150 litres (300 tank).
Timer Control Switch
A suitably rated timer control switch can be installed and will help maximise energy savings with an
electrically boosted solar water heater connected to a continuous, time of use or extended Off-Peak
(overnight and day) electricity supply.
If used with an extended Off-Peak (overnight and day) electricity supply, the timer switch should:
be operated by a continuous power supply on its own circuit from the switchboard with the booster
heating unit operated by the Off-Peak power supply. A double pole isolating switch is required to be
installed at the switchboard to simultaneously isolate both circuits.
or
be of a type which has an internal rechargeable battery to keep time when the power supply is not
available to the timer.
on page 11.
ABOUT YOUR WATER HEATER
7
"Booster Control"
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