CONNECTIONS – ELECTRICAL
61
For reasons of safety and economy, we advise the thermostat be set at the lowest temperature that will provide
sufficient hot water during periods when boosting is required. Rheem recommends the thermostat is set at
60°C to maximise solar contribution. Discuss the thermostat setting requirements with the householder.
BOOSTER CONTROL
The isolating switch(s) installed at the switchboard and adjacent to the solar storage tank (if installed) should
be left switched on.
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.
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.
Refer to “Booster Control” on page 14 for information on programming the timer.
TIMER CONTROL SWITCH WIRING DIAGRAM
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