31
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
Wiring Rules AS/NZS 3000 and all local codes and regulatory authority requirements.
WATER HEATER
The water heater must be directly connected to a 240 V AC, 50 Hz mains power supply with an isolating switch
installed at the switchboard.
Total Rating Per
Heating Unit
Total Current @
240 V AC
Variable Staged Ratings of
Triple Blade Heating Unit
3600 Watts
15 Amps
850 Watts
1050 Watts
1700 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 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.
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 60°C or 75°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. The
thermostats have a fixed temperature setting of 80°C. They are not adjustable.
EXTERNAL CONTROL DEVICE
An external control device must be installed for this water heater to operate as a variable power water heater
and take advantage of excess power generated by a solar PV system. The external control device is installed
remote from the water heater and is wired directly to the switchboard. The external control device
communicates with the Master Controller Module on the water heater. Refer to the installation instructions
provided with the external control device for details of its installation.
The PowerStore
water heater’s Master Controller Module is capable of communications using the power line
telecommunications (PLT) protocol. It is not necessary to hard wire an external control device that is PLT
capable and protocol compliant with the PowerStore water heater, to the water heater.
For an external control device
that cannot use PLT to communicate with the PowerStore water heater’s Master
Controller Module, either due to lack of capability or excessive line noise, then a cable suitable for RS485
communication is required to be connected between the external control device and the Master Controller
Module on the water heater.
The cable must have wire sizes of 0.14 mm
2
to 0.5 mm
2
for solid wires or 0.2 mm
2
to 0.5 mm
2
for stranded
wires to fit the connector supplied. The cable is available from the external control device supplier.
Refer to the
RS485 Communication Cable Connection Procedure
on page 32 for the connection point on the
water heater.
