D-EIMWC01206-15EN - 7/20
Sound protection
When sound levels require special control, great care
must be exercised to isolate the unit from its base by
appropriately applying anti-vibrating elements. Flexible
joints must be installed on the water connections, as
well.
Hydraulic circuit for connection to the unit
The pipes 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-vibrating pipes which reduce the transmission
of vibrations to the structures.
2. Isolating valves to isolate the unit from the water
system of the installation during service operations.
3. Manual or automatic air venting device at the
system’s highest point.; drain device at the system’s
lowest point.
4. Neither the evaporator nor the heat recovery device
must be positioned at the system’s highest point.
5. A suitable device that can maintain the water
system under pressure.
6. Water temperature and pressure indicators to assist
the operator during service and maintenance.
7. A water filter or a device that can remove particles
from the liquid and is mandatory at the entry of the
evaporator.
The filter can be installed at the entrance of the
pump when it is placed on the input pipe of the
water of the evaporator, only if the cleanliness of the
water installation between the pump and the
evaporator is guaranteed. Any slag in the
evaporator causes the warranty of the unit to be
forfeited.
8. If the unit is being replaced, empty and clean the
entire water system before installing a new one and
prior to starting it conduct adequate tests and
chemical treatments of the water.
9. If glycol is added to the water system to provide anti-
freeze protection, the performance of the unit will
decrease. All unit-protection systems, such as anti-
freeze, and low-pressure protection will need to be
readjusted.
10. Before insulating water piping, check that there are
no leaks.
11. Check that the pressure of the water does not
exceed the design pressure of the water side heat
exchangers and install a safety valve on the pipe of
the water.
12. Install a suitable expansion.
CAUTION:
To avoid damages, install a filter that can be
inspected on the water pipes at the entry to the
heat exchangers.
Insulation of the pipes
The complete water circuit, including all the pipes, must
be insulated to avoid condensate from forming and
reducing the cooling capacity.
Protect the water pipes from freezing during the winter
(using for example a glycol solution or a heating cable).
Installing the flow switch
To guarantee sufficient water flow to the entire
evaporator, it is mandatory that a flow switch be
installed on the water circuit which can be positioned on
the incoming or outgoing water pipes. 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 may offer a flow switch specially
selected for this purpose.
This paddle-type flow switch is suitable for heavy-duty
applications.
It has a clean contact that is electrically connected to
the terminals shown in the wiring diagram, and must be
calibrated so that it intervenes when the flow of the
water of the evaporator drops below 80% of the nominal
flow and in any case within the limits listed in the
following table.
Preparation, check and connection of the water
circuit
The units have a water input and output for the
connection of the chiller to water circuit of the system.
This circuit must be connected to the unit by an
authorised technician and must comply with all the
current national and European regulations on the
subject.
NOTE -
The components listed below are not included
with the unit, but are supplied upon request,
also if
their installation is compulsory.
If dirt penetrates the water circuit, there could
be problems. Therefore always remember the
following when connecting the water circuit:
1.
Only use pipes that are clean inside.
2.
Keep the end of the pipe facing downward
when removing the burrs.
3.
Cover the end of the pipe when inserting it
through a wall to avoid dust and dirt getting
in.
4.
Clean the pipes of the system located
between the filter and the unit, with running
water, before connecting it to the system.
