D-EIMAC01207-15EN - 10/22
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 pump inlet when
it is placed on the evaporator water inlet pipe but
only if the cleanliness of the water installation
between the pump and the evaporator is
guaranteed. Any waste in the evaporator will void
the unit guarantee.
8.
If the unit is being replaced, empty and clean the
entire water system before installing a new one
and prior to starting it, carry out 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 to offset the low pressure.
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 tank.
CAUTION
To avoid damage, install an inspectionable filter
on the water pipes at the entry to the heat
exchangers.
Pipe insulation
The complete water circuit, including all pipes, must
be insulated to avoid condensate from forming and
reducing cooling capacity.
Protect 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 vital 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 and 2 1/2" pipe diameters.
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.
Preparing and checking the water circuit connection
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 any 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.
