Daikin EWWD370H-XS Bedienungsanleitung Seite 13

If the unit is installed in places that are easily accessible to
people and animals, it is advisable to install protection grids
around the unit.
To ensure best performance on the installation site, the
following precautions and instructions must be followed:

Make sure to provide a strong and solid foundation to
reduce noise and vibrations.

The water in the system must be particularly clean and all
traces of oil and rust must be removed. A mechanical
water filter must be installed on the unit's inlet piping.
Sound protection
When sound levels require special control, great care must be
exercised to isolate the unit from its base by appropriately
applying anti-vibration elements (supplied as an option).
Flexible joints must be installed on the water connections, as
well.
Water piping
Piping must be designed with the lowest number of elbows
and the lowest number of vertical changes of direction. In this
way, installation costs are reduced considerably and system
performance is improved.
The water system must have:
1. Anti-vibration mountings in order to reduce transmission of
vibrations to the structures.
2. Isolating valves to isolate the unit from the water system
during maintenance.
3. Flow switch.
4. Manual or automatic air venting device at the system's
highest point. Drain device at the system's lowest point.
5. A suitable device that can maintain the water system under
pressure (expansion tank, etc.).
6. Water temperature and pressure indicators to assist the
operator during service and maintenance.
7. In case of unit replacement, the entire water system must
be emptied and cleaned before the new unit is installed.
Regular test and proper chemical treatment of water are
recommended before starting up the new unit.
8. In the event that glycol is added to the water system as
anti-freeze protection, pay attention to the fact that suction
pressure will be lower, the unit's performance will be lower
and water pressure drops will be greater. All unit-protection
systems, such as anti-freeze and low-pressure protection
will need to be readjusted.
9. Before insulating water piping, check that there are no
leaks.
10. Check that the water pressure does not exceed the design
pressure of heat exchangers water side. It's recommended
to install a safety valve on the water piping.
ATTENTION
To prevent tubes damage at heat exchangers install an
inspectable strainer on the inlet water pipings.
Water treatment
Before putting the unit into operation, clean the water circuit.
Dirt, scales, corrosion debris and other material can
accumulate inside the heat exchanger and reduce its transfer.
Pressure drop can increase as well, thus reducing water flow.
Proper water treatment therefore reduces the risk of corrosion,
erosion, scaling, etc. The most appropriate water treatment
must be determined locally, according to the type of system
and water characteristics.
The manufacturer is not responsible for damage to or
malfunctioning of equipment caused by failure to treat water or
by improperly treated water.
Evaporator anti-freeze protection
1. If the unit is not operating during the winter it is
recommended to drain and wash the evaporator and the
water pipes with glycole. Evaporator is supplied with
draining and air flow connections.
2. It is recommended to add an appropriate amount of
glycole inside the water circuit. Freezing temperature for
water-glycole solution should be at least 6°C lower than
the expected minimum ambient temperature.
3. Insulate the pipes in particular those related to the chilled
water to avoid the moisture phenomena.
Damage caused by freezing is not covered by the warranty.
Installing the flow switch
To ensure sufficient water flow through the evaporator, it is
essential that a flow switch be installed on the water circuit.
The flow switch can be installed either on the inlet or outlet
water piping. The purpose of the flow switch is to stop the unit
in the event of interrupted water flow, thus protecting the
evaporator from freezing.
The manufacturer offers, as optional, a flow switch that has
been selected for this purpose.
This paddle-type flow switch is suitable for heavy-duty outdoor
applications (IP67) and pipe diameters in the range of 1" to 8".
The flow switch is provided with a clean contact which must be
electrically connected to terminals shown in the wiring
diagram.
Flow switch has to be tuned to stop the unit when the
evaporator water flow is lower than 50% of nominal flow rate.
Electrical Installation
General specifications
All electrical connections to the unit 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 unit you have
bought. Should the wiring diagram not be on the unit or
should it have been
manufacturer representative, who will send you a copy.
In case of discrepancy between wiring diagram and
electrical panel/cables please contact the manufacturer
representative.
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 connected
separately from the power cables. Use different electrical
passage ducts for this purpose.
Before servicing the unit in any way, open the general
disconnecting switch on the unit's main power supply.
When the unit is off but the disconnecting switch is in the
closed position, unused circuits are live, as well.
Never open the terminal board box of the compressors before
having opened the unit's general disconnecting switch.
Contemporaneity of single-phase and three-phase loads and
unbalance between phases could cause leakages towards
ground, during the normal operation of the units of the series.
If the unit includes devices that cause superior harmonics (like
VFD and phase cut), the leakage towards ground could
increase to very high values (about 2 Amp).
The protections for the power supply system have to be
designed according to the above mentioned values.
Operation
Operator's responsibilities
It is essential that the operator is appropriately trained and
becomes familiar with the system before operating the unit. In
addition to reading this manual, the operator must study the
microprocessor operating manual and the wiring diagram in
order to understand start-up sequence, operation, shutdown
sequence and operation of all the safety devices.
During the unit's initial start-up phase, a technician authorized
by the manufacturer is available to answer any questions and
to give instructions as to the correct operating procedures.
The operator must keep a record of operating data for every
installed unit. Another record should also be kept of all the
periodical maintenance and servicing activities.
If the operator notes abnormal or unusual operating conditions,
he is advised to consult the technical service authorized by the
manufacturer.
D–EIMWC00308-16EU - 13/192
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