Rheem Electric Domestic Water Heater - Manual (Page 27)

CONNECTIONS – ELECTRICAL
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 Standards Australia Wiring Rules
AS/NZS 3000 and local authority requirements.
WATER HEATER
A water heater not fitted with a supply cord and plug must be directly connected
to a 240 V AC, 50 Hz mains power supply with an isolating switch installed at
the switchboard. A water heater fitted with a supply cord and plug must be
plugged into a switched 240 V AC, 50 Hz mains power outlet rated at 10 A.
The power supply to a
twin element model should be Off-Peak (overnight) to
the bottom heating unit and continuous to the top heating unit . The power
supply to a single element model can be either an Off-Peak (overnight) ,
Extended Off-Peak (overnight and day) or continuous electricity supply,
depending upon the size of the water heater. Check with the local electricity
supply authority as to their requirements. An Off-Peak (overnight) power supply
will provide the maximum financial savings. Discuss the power supply
requirements with the householder.
A flexible 20 mm conduit is required for the electrical cable to the water heater.
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 on a Rheemglas and RheemPlus model is adjustable from
60
°C to 70°C (60°C to 75°C on a 50 litre model) and on an Optima model from
60 °C to 75°C. The thermostat is adjusted by turning the adjuster
(Rheemglas / RheemPlus model) or knob (Optima model) anticlockwise to
decrease the temperature setting and clockwise to increase the temperature
setting. Only adjust the thermostat setting on a Rheemglas and RheemPlus
model when the isolating switch is switched off at the switchboard. The top
thermostat on a twin element model is fixed at 60
°C.
For reasons of safety and economy, we advise the thermostat be set at the
lowest temperature that will provide sufficient hot water. Dishwasher running
costs can be adversely affected if the thermostat is set below 65
°C. If this water
heater is installed as part of a solar water heating system, we recommend the
thermostat is set at 60
°C to maximise solar contribution. Discuss the thermostat
setting requirements with the householder.
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