D
–EIMHP01201-18_04EN - 18/24
For process cooling and/or heating applications, the request is typically for very high accuracy and stability of the
supplied water temperatures. In al those cases the minimum water content to be considered should be increased from
the “6.5 lt/kW”. In that situation a deeper analysis must be carried by the system designer with full awareness of the
whole system c
haracteristic and final user’s expectations.
To comply with the minimum water volume could be necessary to add a buffer water tank to the circuit. The solution is to
use a “two-attack” buffer tank installed on the return from the system to the unit.
3.11
Electric connections
Provide an electrical circuit to connect the unit. It must be connected to the copper cables with an adequate section relative
to the plate absorption values and according to the current electrical standards.
Daikin Applied Europe S.p.A. declines all responsibility for an inadequate electrical connection.
The connections to the terminals must be made with copper terminals and cables, otherwise
overheating or corrosion may occur at the connection points with the risk of damaging the unit. The
electrical connection must be carried out by qualified personnel, in compliance with the laws in force.
There is a risk of electric shock.
The power supply to the unit must be set up in such a way that it can be switched on or off independently from that of other
system components and other equipment in general, by means of a general switch.
The electrical connection of the panel must be carried out maintaining the correct sequence of the phases. Refer to the
specific wiring diagram for the unit you have bought. Should the wiring diagram not be on the unit or should it have been
lost, please contact your manufacturer representative, who will send you a copy. In case of discrepancy between wiring
diagram and electrical panel/cables, please contact the manufacturer representative.
Do not apply torque, tension or weight to the main switch terminals. Power line cables must be
supported by appropriate systems.
To avoid interference, all control wires must be connected separately from the power cables. To do this, use several
electrical passage ducts.
Simultaneous single and three-phase loads and phase unbalance can cause ground losses of up to 150 mA during normal
unit operation. If the unit includes devices that generate higher harmonics, such as an inverter or phase cut, ground losses
can increase to much higher values, about 2 A.
The protections for the power supply system must be designed according to the values mentioned above. A fuse must be
present on each phase and, where provided for by the national laws of the country of installation, a leak detector to earth.
This product complies with EMC (Electromagnetic Compatibility) standards for industrial environments. Therefore it is not
intended for use in residential areas, e.g. installations where the product is connected to a low voltage public distribution
system. Should this product need to be connected to a low voltage public distribution system, specific additional measures
will have to be taken to avoid interference with other sensitive equipment.
Before any electrical connection work to the compressor motor and / or the fans, make sure that the
system is switched off and the main switch of the unit is open. Failure to observe this rule could
result in serious personal injury.
3.11.1
Cable requirements
The cables connected to the circuit breaker must respect the insulation distance in the air and the surface isolation distance
between the active conductors and the earth, according to IEC 61439-1 table 1 and 2, and to the local national laws.
The cables connected to the main switch must be tightened using a pair of keys and respecting the unified clamping values,
relative to the quality of the screws of the washers and nuts used.
Connect the earth conductor (yellow / green) to the PE ground terminal.
The equipotential protection conductor (earth conductor) must have a section according to table 1 of EN 60204-1 Point
5.2, shown below.
In any case, the equipotential protection conductor (earth conductor) must have a cross section of at least 10 mm2, in
accordance with point 8.2.8 of the same standard.
3.11.2
Interconnection cables
The unit cannot operate without the flow of water, thanks to the intervention of the flow switch. However, in order to have
double safety,
it is mandatory to install a water pump status contact in series with the contact of the flow switch(es),
to prevent the unit from operating even without the pump starting.
If the unit is operated without the flow of water, it
will cause serious damage (freezing of the evaporator).
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Clean contacts: the controller has some clean signal contacts. These contacts can be wired as indicated in the
wiring diagram. The maximum permissible current is 2 A.
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Remote inputs: in addition to the clean contacts, it is also possible to install remote inputs. For installation, refer
to the wiring diagram.
