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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 edition of the Wiring Rules AS/NZS 3000 in force in
the state or territory at the time of installation, 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 220 V - 240 V a.c. 50 Hz mains power supply with an isolating switch
installed at the switchboard.
The Wiring Rules AS/NZS 3000:2018 requires a second and lockable isolating
switch be installed adjacent to but not on or attached to the water heater, and a
residual current device (RCD) installed in the electrical circuit to the water heater.
This isolating switch must isolate both circuits to a twin element water heater.
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,
or the wiring protected by insulating sleeving with an appropriate temperature
rating if it can make contact with the internal storage cylinder. The temperature
of the internal storage cylinder can reach 75°C for 080 to 315 models or 80°C for
050 models under normal operation.
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
220 V - 240 V a.c. 50 Hz mains power outlet rated at 10 A.
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