40
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. There is NO WARRANTY for the dry firing of the electric heating
unit.
Ensure the water heater has been in the installed position for a minimum of 30 minutes before switching on
the electricity supply to the water heater. Refer to “To Fill and Turn On The Water Heater” on page 42.
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 electrical
power supply cable from the switch board to the water heater must be correctly sized to safely carry the
maximum current draw of the heat pump and electric heating unit operating together on the water heater. The
power supply must be able to supply a minimum of 13 Amps.
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.
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 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 conduit and electrical cable are to be installed so they are not subject to wear, corrosion, excessive
pressure, vibration, sharp edges or any other adverse environmental effects over the life of the water heater.
The 251E280 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.
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 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, and is controlled by the electronic controller. The
electric heating unit will be automatically activated during periods when the ambient air temperature falls below
-6°C or above 43°C and heating of the water is required. In addition, if the heat pump operates between -6°C
and 7°C for longer than 3 hours 20 minutes, the electric heating unit will turn on to assist in the heating of the
water. The thermostat and sensors controlling the heat pump and the electric heating unit are factory set and
not adjustable.
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