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2 Specific installer safety instructions
WARNING
If NOT factory installed, a main switch or other means for
disconnection, having a contact separation in all poles
providing full disconnection under overvoltage category III
condition, MUST be installed in the fixed wiring.
WARNING
▪ ONLY use copper wires.
▪ Make sure the field wiring complies with the applicable
legislation.
▪ All field wiring MUST be performed in accordance with
the wiring diagram supplied with the product.
▪ NEVER squeeze bundled cables and make sure they
do NOT come in contact with the piping and sharp
edges. Make sure no external pressure is applied to the
terminal connections.
▪ Make sure to install earth wiring. Do NOT earth the unit
to a utility pipe, surge absorber, or telephone earth.
Incomplete earth may cause electrical shock.
▪ Make sure to use a dedicated power circuit. NEVER
use a power supply shared by another appliance.
▪ Make sure to install the required fuses or circuit
breakers.
▪ Make sure to install an earth leakage protector. Failure
to do so may cause electrical shock or fire.
▪ When installing the earth leakage protector, make sure
it is compatible with the inverter (resistant to high
frequency electric noise) to avoid unnecessary opening
of the earth leakage protector.
WARNING
▪ After finishing the electrical work, confirm that each
electrical component and terminal inside the electrical
components box is connected securely.
▪ Make sure all covers are closed before starting up the
unit.
CAUTION
▪ When connecting the power supply: connect the earth
cable
first,
before
connections.
▪ When disconnecting the power supply: disconnect the
current-carrying cables first, before separating the earth
connection.
▪ The length of the conductors between the power supply
stress relief and the terminal block itself MUST be as
such that the current-carrying wires are tautened before
the earth wire is in case the power supply is pulled
loose from the stress relief.
Installation manual
4
making
the
current-carrying
NOTICE
Precautions when laying power wiring:
▪ Do NOT connect wiring of different thicknesses to the
power terminal block (slack in the power wiring may
cause abnormal heat).
▪ When connecting wiring which is the same thickness,
do as shown in the figure above.
▪ For wiring, use the designated power wire and connect
firmly, then secure to prevent outside pressure being
exerted on the terminal board.
▪ Use an appropriate screwdriver for tightening the
terminal screws. A screwdriver with a small head will
damage the head and make proper tightening
impossible.
▪ Over-tightening the terminal screws may break them.
Install power cables at least 1 meter away from televisions or radios
to prevent interference. Depending on the radio waves, a distance of
1 meter may NOT be sufficient.
NOTICE
ONLY applicable if the power supply is three‑phase, and
the compressor has an ON/OFF starting method.
If there exists the possibility of reversed phase after a
momentary black out and the power goes ON and OFF
while the product is operating, attach a reversed phase
protection circuit locally. Running the product in reversed
phase can break the compressor and other parts.
2
Specific installer safety
instructions
Always observe the following safety instructions and regulations.
Preparation (see "6 Preparation" [ 4 6])
WARNING
▪ All wiring MUST be performed by an authorised
electrician and MUST comply with the applicable
national wiring regulation.
▪ Make electrical connections to the fixed wiring.
▪ All components procured on-site and all electrical
construction
MUST
legislation.
WARNING
ALWAYS use multicore cable for power supply cables.
WARNING
The switch box lid must only be opened by a licensed
electrician. Switch off the power supply before opening the
switch box lid.
Installation (see "7 Installation" [ 4 8])
DANGER: RISK OF ELECTROCUTION
WARNING
ALWAYS use multicore cable for power supply cables.
Domestic hot water tank with option kit for air to water heat pump
comply
with
the
applicable
EKHWS150~300D3V3
system
4P510672-1C – 2023.02
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