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HOW YOUR WATER HEATER WORKS
MANUAL ON/OFF SWITCH
a) Off-Peak (overnight) Tariff Connection
Most systems will be connected to an Off-Peak supply of electricity. Boosting will only occur overnight
(usually between 11:00 PM and 6:00 AM). In the winter months many households will find it necessary
to leave the booster switch ON. However, in some cases it may only be necessary to switch the booster
switch ON every second night. This can be determined over a trial period. At other times, care should
be taken not to leave the switch on during periods of no power, as solar savings will be reduced if the
booster heating unit activates upon resumption of power.
b) Extended Off-Peak (overnight and day) Tariff Connection
Operation is very similar to that suggested for continuous
tariff, but it is important to be aware of the hours during which
electricity is available so boosting, if required, can be adapted
to suit. (Check with your local Electricity Supply Authority for
hours of operation). Do not leave the booster switch on during
daylight hours unless boosting is required, as solar savings
will be reduced.
c) Continuous Tariff Connection
Operate the booster switch to activate the auxiliary booster
heating unit when the hot water falls below an acceptable
temperature. The amount of water heated depends on your
installation (refer to
“Manual Controls” on page 9). It is
important to ensure the booster switch is turned OFF after you
have satisfied your hot water needs. Do not leave the booster
switch ON in daylight hours because your solar savings will
be reduced.
“ONE SHOT CONTROL” SWITCH
The “One Shot Control” switch will help provide maximum savings with an electrically boosted solar
water heater connected to a continuous electricity supply. Power must be available to the “One Shot
Control” switch before the booster heating unit can be activated.
The switch has a push button operation and incorporates an
indicator light. Refer to the manufacturer’s instructions
supplied with the “One Shot Control” switch for information on
how the indicator light arrangement works.
When you decide the hot water is below a usable temperature
and additional hot water is required, press the control button.
The booster heating unit will be turned “ON” if the water
temperature is below the thermostat setting, then
automatically turn “OFF” when the water temperature reaches
the thermostat setting.
It is not necessary to activate the booster heating unit every time the light indicates that boosting may
be required. The water may still be at a usable temperature for some purposes (e.g. showering) and
you may not need to use hot water for some hours during which time the water may be heated by the
sun.
Remember, even on cloudy days your solar water heater can receive diffuse radiation, which
will provide some heat to your stored water. On these days you will need to operate the booster
heating unit only as desired. For summer operation it is recommended trial periods be
undertaken to determine if it is necessary to turn the booster switch or one shot control ‘on’ at
all.
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