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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.
If this water heater is installed with an in-series booster, then the electric booster heating unit will not need to
be connected to a power supply and the references to the electric booster heating unit, thermostat and boosting
controls in these installation instructions will not be applicable to the installation.
Note:
AS 3498 requires that a water heater provides the means to inhibit the growth of Legionella bacteria in
potable water. This water heater can satisfy this AS 3498 requirement provided, where an in-series booster
water heater is not installed, the electric booster is energised for a sufficient period each day and the electric
booster thermostat setting is 60°C or higher.
The power consumption of the water heater is:
Component
Power
consumption
Comments
Solar controls
4 Watts
Constant load - differential controller
Solar circulator
36 Watts
Maximum load at solar heating cycle start-up
30 Watts
Average load during the solar heating cycle
Booster heating unit
3600 Watts
Load when booster heating unit is operating
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.
SOLAR STORAGE TANK
The solar storage tank with an electric booster heating unit 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 solar storage tank, and a residual current device (RCD) installed in the electrical circuit to the
water heater.
The booster heating unit and the terminal block for the electrical connection is behind the front cover located
at the midpoint of the tank. A flexible 20 mm conduit is required for the electrical cable to the solar storage
tank. 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 under normal operation.
The water heater is more suited for the booster heating unit to be connected to either a continuous, or a time
of use, or an extended Off-Peak (overnight and day) electricity supply. A timer can also be used to control the
boosting periods and help maximise solar savings. Refer to
on page 51.
The booster heating unit may be connected to an Off-Peak (overnight) electricity supply, however this will only
allow the booster to heat the water overnight. If this type of connection is considered, care must be taken to
ensure there is sufficient boost capacity to meet
the household’s full day and night’s hot water supply during
periods of no or low solar gain, particularly in cold weather.
Discuss the power supply and hot water usage requirements with the householder.
The solar control unit is supplied with a power cord to be plugged into a general purpose outlet (GPO). Refer
to
on page 50.
