Technical data

30
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 local
authority requirements.
WATER HEATER
A water heater not fitted with a supply cord and plug must be directly connected
to a 240 V AC, 50 Hz mains power supply with an isolating switch installed at
the switchboard.
The power supply to a twin element model should be Off-Peak (overnight) to
the bottom heating unit and continuous to the top heating unit. The power
supply to a single element model can be either an Off-Peak (overnight),
Extended Off-Peak (overnight and day) or continuous electricity supply.
Check with the local electricity supply authority as to their requirements.
An Off-Peak (overnight) power supply will provide the maximum financial
savings. 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.
THERMOSTAT SETTING
The thermostat on an Optima model is user adjustable from 60°C to 75°C.
The thermostat is adjusted by turning the knob anticlockwise to
decrease the temperature
setting and clockwise to increase the temperature
setting. The top thermostat on a twin element model is fixed at 60°C.