33
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.
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 between 100
KΩ and 660 KΩ for this water heater is normal.
Typically the insulation resistance between live and earthed parts of an electrical installation should not be
less than 1
MΩ. However AS/NZS 3000:2000 clause 6.3.3.3.2 „Results‟ states:
“The value of 1 MΩ may be reduced to:
0.01
MΩ for sheathed heating elements or appliances; or
a value permitted in the Standard applicable to electrical equipment.”
This model water heater is categorised as a „stationary class 1 motor operated appliance‟ and has been
tested to AS/NZS 3350.1:2002 clause
16 „Leakage current and electric strength‟ and has passed the
requirements of this Standard. Therefore, this model water heater complies with the condition stated in
AS/NZS 3000:2000 clause 6.3.3.3.2 (b).
ELECTRICAL CONNECTION
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.
The water heater must be directly connected to a 240 V AC 50 Hz mains power supply. The water heater
must be on its own circuit with an isolating switch installed at the switchboard. A secondary isolating switch
may be installed within reach of 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. 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 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.
BOOSTER HEATING UNIT AND THERMOSTAT SETTING
The water heater has a booster heating unit and thermostat. The booster heating unit will be automatically
activated during periods when the ambient temperature is below 3°C to 5 C and heating of the water is
required. The thermostat is not adjustable.
TIMER
A timer can be added to the circuit at a suitable location if the customer requires the water heater does not
operate between certain hours, such as during the night. The timer must be weatherproof if it is installed
outdoors.
Note:
A timer will affect the operating times of both the heat pump circuit and the booster heating unit.
