HYDRAULIC CIRCUIT KEY
(PUMP VERSION)
1 Condenser
2 Evaporator
3 Flow switch
4 Pumps
5 Air bleed valve
6 Water discharge
7 Filter
8 Expansion tank
NB
The Victaulic joints and the soldering
studs for the condenser and evaporator
are provided
20. HYDRAULIC CIRCUIT
The NXW standard version is comprised
of a circuit including:
− Evaporator (plate type exchanger)
−
Condenser (plate type exchanger)
− Water inlet probe SIW
− Water outlet probe SUW
NB:
the weld pipe is supplied as standard
with the VICTAULIC connection is
included
The NXW version with pumping group
also includes:
−Circulation pump
−Water filter
−Drain valve
−Flow switch
−Water outlet/inlet probe
−Expansion tank (25 litres)
20.1. EXTERNAL HYDRAULIC CIRCUIT
RECOMMENDED
The selection and installation of compo-
nents outside the NXW should be carried
out by the installer, who should work ac-
cording to the technical code of practice
and in compliance with the legislation in
force in the country of destination (MD
329/2004).
Before connecting the pipes make sure
that they do not contain stones, sand,
rust, slag or any foreign bodies that may
damage the system. It is necessary to
make a by-pass to the unit to be able to
carry out the cleaning of the pipes with-
out having to disconnect the machine.
The connection pipes must be properly
supported so as not to burden the unit
with their weight.
On the water circuit, it is advisable to
install the following instruments, if not
foreseen in the version you have:
1. Two pressure gauges of suitable size
(input and output section).
2. Two anti-vibration couplings (input
and output section).
3. Two shut-off valves (normal input sec-
tion, output section calibrating valve).
4. Two thermometers (input and out-
put section).
5. Expansion tanks
6. Pump
7. Accumulation tank
8. Flow switch
9. Safety valve
10. Charging unit
11. Water filter
11.
The filter protects only the exchang-
ers (in case of particularly dirty
water, we recommend an external
filter to protect the pumps)
Compulsory hydraulic circuit com-
pnents (in case of an NXW provided
without the hydronic kit (evaporator
side, condenser side):
- At the inlet or each plate heat exchang-
er the installation of a flow switch (not
included) is compulsory at the penalty of
invalidating the warranty.
- Installation of the mechanical filter is
compulsory
at the inlet of each plate heat ex-
changer at the penalty of invalidating
the warranty. The filter must have filter-
ing holes with a diameter not greater
than one millimetre and must be kept
clean, therefore the cleaning must be
verified after installation of the unit and
the condition must be checked periodi-
cally.
It is necessary, that the water flow rate to
the chiller unit complies with the values
reported in the performance tables.
The systems loaded with anti-freeze or
specific regulations, need the water
backflow system.
Special supply/recovery water, is carried
out with appropriate treatment systems.
20.2. SYSTEM LOAD
− Before starting the load, check that
the system drain tap is closed.
− Open all the drain valves of the
system and of the related terminals.
− Open the shut-off devices of the
system.
− Start the filling by slowly opening
the water system load cock placed
outside the machine.
− When water begins to flow from the
terminal vent valves, close them
and continue loading up to read
on the gauge the value of 1.5 bar.
The system is loaded at a pressure
between 1 and 2 bar.
It is advisable to repeat this operation
once the machine has worked for
some hours and to periodically check
the system pressure, restoring if it drops
below 1 bar.
Check the hydraulic seal of the joints.
20.3. EMPTYING THE SYSTEM
− Before starting to drain the system,
turn "off" the unit
− Check that the water system load/
restore tap is closed
− Open the drain tap outside the
machine and all the vent valves of
the system and the corresponding
terminals.
If the system uses glycol, this liquid
should not be drained to the environ-
ment because it is a pollutant. It must be
collected and, if possible, reused.
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Example of NXW Version [H]
39
INXWPY. 1004. 4438805_00
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