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
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
The water heater 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. The second and lockable isolating switch and RCD may not be required if the installation
of this water heater is considered a repair under Clause 1.9.3.2 of the Wiring Rules, i.e., the installation of the
water heater tank is a straight change-over with a straight disconnect / reconnect of the wiring and where there
is no modification to the electrical wiring of the final subcircuit or no increase in electrical load above the circuit
capacity.
Total Rating Per
Heating Unit
Total Current @
240 V a.c.
Staged Ratings of
Triple Blade Heating Unit
3600 Watts
15 Amps
515 Watts
1030 Watts
2055 Watts
The power supply must be a Continuous / Domestic Time of Use type. A separately metered controlled load
supply, i.e. Off-Peak / time controlled, is not suitable. Check with the local electricity supply authority as to their
requirements. A home management system will provide the maximum financial savings by supplying utility grid
sourced power at cheaper tariff times when additional heating is required. 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 80°C on occasion.
Note:
If the water heater is installed on a property that has export limiting capability of the solar PV power
production, then it must be connected to a home energy management system (HEMS) for it to operate using
excess solar PV power production.
SENSOR AND THERMOSTAT SETTINGS
The temperature sensors control the maximum water temperature in conjunction with the control system.
Water is heated to either 70°C or 80°C depending on the mode of operation. These temperature settings are
fixed and cannot be adjusted.
The thermostats act as a backup safety device to control the electricity supply to the heating unit. Their primary
purpose is to disconnect the electricity supply to the heating unit in the event of a sensor or control system
failure that results in power continuing to be supplied to a heating unit after the designed temperature setting
has been achieved. Their secondary purpose is to provide an over-temperature cut-out function if required.
The thermostats are installed with a temperature setting of 80°C.
They must not be adjusted.
