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The power supply to the water heater must not be switched on until the water heater is filled with
water and a satisfactory megger reading is obtained.
All electrical work and permanent wiring must be carried out by a qualified person and in accordance with the
Wiring Rules AS/NZS 3000 and all local codes and regulatory authority requirements.
If this water heater is installed with an in-series booster, then the electric booster heating unit will not need to
be connected to a power supply and the references to the electric booster heating unit, thermostat and
boosting controls in these installation instructions will not be applicable to the installation.
Note: AS 3498 requires that a water heater provides the means to inhibit the growth of Legionella bacteria in
potable water. This water heater can satisfy this AS 3498 requirement provided the electric booster is
energised for a sufficient period each day and the electric booster thermostat setting is 60°C or higher.
SOLAR STORAGE TANK
The solar storage tank with an electric booster heating unit must be directly connected to a 240 V AC 50 Hz
mains power supply with an isolating switch installed at the switchboard.
The power supply can be either a continuous, or a time of use, or an extended Off-Peak (overnight and day)
or an Off-Peak (overnight) electricity supply. Discuss the power supply requirements with the householder.
A flexible 20 mm conduit is required for the electrical cable to the solar storage tank. The conduit is to be
connected to the unit with a 20 mm terminator. Connect the power supply wires directly to the terminal block
and earth tab connection, ensuring there are no excess wire loops inside the front cover.
THERMOSTAT SETTING
The thermostat is adjustable from 60°C to 70°C. The thermostat is adjusted by turning the adjuster
anticlockwise to decrease the temperature setting and clockwise to increase the temperature setting. Only
adjust the temperature setting when the isolating switch is switched off at the switchboard.
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 installed in the electrical meter box for the solar storage tank 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.
Power must be available to the timer control switch before the booster heating unit can be activated.
CONNECTIONS – ELECTRICAL
33
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