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34
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 Wiring Rules AS/NZS 3000 and all local codes and
regulatory authority requirements.
WATER HEATER
The water heater 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 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. The temperature
rating of the power supply wires insulation must suit this application.
THERMOSTAT SETTING
The thermostat on a Rheem 49 series 250 to 400 litre model is tradesperson
adjustable from 60°C to 70°C. The factory setting of the thermostat is 70°C for
these models.
The thermostat is adjusted by turning the adjuster anticlockwise to decrease the
temperature setting and clockwise to increase the temperature setting. Only
adjust the thermostat setting when the isolating switch is switched off at the
switchboard. The top thermostat on a twin element model is fixed at 60°C and
cannot be adjusted.
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. Discuss the
thermostat setting requirements with the householder.
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