Electrical Installation; General Specifications; Electrical Components; Electrical Wiring - Daikin EWYD-BZ Series Installation, Maintenance & Operation Manual

Electrical installation

General specifications

All electrical connections to the machine must be carried out in compliance with laws and regulations in force.
All installation, management and maintenance activities must be carried out by qualified personnel.
Refer to the specific wiring diagram for the machine that you have purchased and which was sent with the unit. Should
the wiring diagram not appear on the machine or should it have been lost, please contact your nearest manufacturer
office, who will send you a copy.
Only use copper conductors. Failure to use copper conductors could result in overheating or corrosion at connection
points and could damage the unit.
To avoid interference, all control wires must be installed separately from the power cables. Use separate electrical
conduits for this purpose.
Before any installation and connection work, the system must be switched off and secured. After switching off the unit,
the intermediate circuit capacitors of the inverter are still charged with high voltage for a short period of time. The unit can
be worked on again after it has been switched of for 5 minutes.
The units of the series are provided with non-linear high power electrical components (compressor VFD, which introduce
higher harmonics) can cause considerable dispersion to earth, of about 2 A.
The electricity supply system protection must take the above values into account.

Electrical components

All power and interface electrical connections are specified in the wiring diagram that is shipped with the machine.
The installer must supply the following components:
- Power supply cables (dedicated conduit)
Interconnection and interface cables (dedicated conduit)
-
Thermal-magnetic circuit breaker of suitable size (please see electrical data)
-

Electrical wiring

Power circuit:
Connect electrical power supply cables to the terminals of the general circuit breaker located on the machine's terminal
board. The access panel must have a hole of appropriate diameter for the cable used and its cable gland. A flexible
conduit can also be used, containing the three power phases plus ground.
In any case, absolute protection against any water penetrating through the connection point must be ensured.
Control circuit:
Every machine of the series is supplied with an auxiliary 400/ 230V control circuit transformer. No additional cable for the
control system power supply is thus required.
Only if the optional separate accumulation tank is requested, the electrical anti-freeze resistance must have a separate
power supply.

Electrical heaters

The machine has an electrical anti-freeze heater that is installed directly in the evaporator. Each circuit also has an
electrical heater installed in the compressor, whose purpose is to keep the oil warm thus preventing the presence of
liquid refrigerant mixed with the oil in the compressor. Obviously, the operation of the electrical heaters is guaranteed
only if there is a constant power supply. If it is not possible to keep the machine powered when inactive during winter,
apply at least two of the procedures described in the "Mechanical installation" section under the paragraph "Antifreeze
protection of evaporator and heat recovery exchangers".
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