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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.
MEGGER READING
When a megger test is conducted on this water heater, then the following should be noted.
Warning: This water heater contains electronic equipment and 500 V insulation tests must only be
conducted between active and earth and between neutral and earth. An active to neutral test WILL damage
the electronics.
An insulation test result of greater than 1 MΩ for this water heater is normal.
ELECTRICAL CONNECTION
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.
The water heater must be directly connected to a 220 V - 240 V a.c. 50 Hz mains power supply. The power
supply must be able to supply a minimum of 15 Amps.
Note: It is not recommended to connect this water heater via a power switching device which allows alternative
supply of grid power and photovoltaic (PV) power.
The water heater must be on its own circuit with an isolating switch installed at the switchboard. The Wiring
Rules 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.
The 571D270 model water heater is recommended for connection to an uninterrupted 24 hour continuous tariff
power supply. Depending upon the size of the household and its hot water requirements and if the Electricity
Retailer permits, an extended off-peak (overnight and day) or Extended time-controlled power supply
connection of a minimum 16 hours per day may also be suitable.
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 at the lower front cover. 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 60°C under normal operation.
The water heater will only operate on a sine wave at 50 Hz. Devices generating a square wave cannot be used
to supply power to the water heater.
ELECTRIC HEATING UNIT AND THERMOSTAT SETTING
The water heater has an electric heating unit and thermostat. The electric heating unit will be automatically
activated during periods when the ambient air temperature falls below -5°C or above 43°C and heating of the
water is required. The thermostat is not adjustable.
TIMER
A Timer function on the Display Panel allows the hours of operation of the water heater to be set. Refer to
“Timer” on page 21.
It may be desirable for the heat pump not to operate between certain hours, such as during the peak period
when connected to a Time of Use electricity supply due to a more expensive tariff rate applying.
The Timer will affect the operating times of both the heat pump circuit and the electric heating unit.
Note: If there is a risk of freezing conditions, the electrical supply to the water heater should not be switched
off, otherwise damage could result (refer to “Freeze Protection” on page 10).
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