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33
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
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.
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.
Note: Remove the yellow warning label from the conduit entry before connecting
the conduit and wiring.
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.
THERMOSTAT SETTING
The thermostat at the bottom of the water heater is tradesperson adjustable from
60°C to 75°C (60°C to 80°C on a 050 model). The factory setting of the
thermostat is 65°C for a single element 080 to 315 model, 70°C for a twin element
model and 80°C for a 050 model. 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 has as fixed setting of 60°C.
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