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2
Introduction
These water coolers are monoblock units for the production of
cooled water in a closed circuit.
The fan, pump and compressor motors are equipped with a
thermal protector that protects them against possible overheat-
ing.
2.1 Transport
The packed unit must remain:
a) Upright;
b) Protected against atmospheric agents;
c) Protected against impacts.
2.2 Handling
Use a fork-lift truck suitable for the weight to be lifted, avoiding
any type of impact (see paragraph 7.3).
2.3 Inspection
a) All the units are assembled, wired, charged with refrigerant
and oil and tested in the factory;
b) On receiving the machine check its condition: immediately
notify the transport company in case of any damage;
c) Unpack the unit as close as possible to the place of instal-
lation.
2.4 Storage
a) Keep the unit packed in a clean place protected from damp
and bad weather.
b) Do not stack the units;
c) Follow the instructions given on the package.
3
Installation
Y
For correct installation, follow the instructions given in
chapter 7.
!
The product installed must be suitably protected against
fi re risk (ref. EN378-3).
!
Liquids to be chilled
The liquids to be chilled must be compatible with the materials
used.
Examples of liquids used are water or mixtures of water and
ethylene or propylene glycols.
The liquids to be chilled must not be fl ammable.
If the liquids to be chilled contain hazardous substances
(e.g. ethylene/propylene glycol), any liquid discharged from a
leakage area must be collected, because it is harmful to the
environment. When draining the hydraulic circuit, comply with
the current regulations and do not disperse the contents in the
PCW420-650
environment.
3.1 Operating space
To allow an unrestricted air fl ow around the chiller and easy ac-
cess for servicing, ensure the area around the unit is kept free
of obstacles (see paragraph 7.4).
Leave a space of at least 2 metres above the refrigerator in
models with vertical emission of condensation air.
3.2 Foundation
The unit must be placed on a level surface which will support
its weight.
For wheight distribution see paragraph 7.5 - Support position
and loads.
3.3 Versions
Air-cooled version
Axial fans (A)
Do not create cooling air recirculation situations.
Do not obstruct the ventilation grilles.
The ducting of extracted air is not recommended for versions
with axial fans.
Water- cooled version (W)
If the water to the condenser is in open circuit, install a mesh
fi lter on the condensation water inlet.
Please note that for special cooling water types such as dem-
ineralized, deionized or distilled it is necessary to contact the
manufacturer to verify which kind of condenser should be used
since the standard material may not be suitable.
3.4 Water circuit
3.4.1 Checks and connection
Y
Before connecting the chiller and fi lling the water circuit,
check that all the pipes are clean. If not, wash them out thor-
oughly.
Y
If the plumbing circuit is of the closed type, under pres-
sure it is advisable to install a safety valve set to 6 bar.
Y
Always install mesh fi lters on the water inlet and outlet
pipelines.
Y
If the hydraulic circuit is intercepted by automatic valves,
protect the pump with an anti-hammering system.
Preliminary checks
1) Check that any shut-off valves in the water circuit are open.
2) In the case of a closed water circuit, check that an ex-
pansion tank of suitable capacity has been installed. See
paragraph 3.4.3.
Connection
1) Connect the water cooler to the inlet and outlet piping, us-
ing the special connections located on the back of the unit.
We recommend the use of fl exible unions to reduce system
rigidity.
2) Fill the water circuit using the fi tting provided on the rear of
the chiller .
3) The tank is equipped with a breather valve that should be
operated manually when fi lling the tank. Also, if the hydrau-
lic circuit has high points, install a vent valve at the highest
points.
4) We recommend that taps are installed on the inlet and out-
let pipes, so that the unit can be excluded for maintenance
when necessary.
5) If the chiller works with an open tank, the pump must be
installed on intake to the tank and on delivery to the chiller.
Subsequent checks
1) Check that the tank and the circuit are completely full of
water and that all the air has been expelled from the system.
2) The water circuit must always be kept full. For this reason,
carry out periodic checks and top the circuit up if necessary,
or install an automatic fi lling kit.
water characteristics
If not provided in the supply, fi t a mesh fi lter on the water inlet
Y,
Inlet water/inlet condensation water characteristics:
Temperature
≥50°F (10°C)
ΔT IN/OUT
5-15°C
Max % glycol
50
43.5-145 PSIg
Pressure
(3-10 barg)
PH
7.5-9
Electrical
10-500 μS/cm
conductivity
Langelier
saturation
0-1
index
2-
SO
<50 ppm
4
NH
<1 ppm
3
Please note that for special water types such as demineralized,
deionized or distilled it is necessary to contact the manufac-
turer to verify which kind of chiller should be used since the
standard material may not be suitable.
3.4.2 Water and ethylene glycol
If installed outdoors or in an unheated indoor area, it is possible
that the water in the circuit may freeze if the system is not in
2/10
-
CL
<50 ppm
CaCO
70-150 ppm
3
O
<0.1 ppm
2
Fe
<0.2 ppm
NO
<2 ppm
3
HCO
-
70-300 ppm
3
H
S
<0.05 ppm
2
CO
<5 ppm
2
Al
<0.2 ppm
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