Table des Matières
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1. Cooling unit application.
The cooling units described in this manual are de-
signed and built to cool the air inside switchboards
in order to protect components sensitive to thermal
shock and, at the same time, providing an IP54
protection level against the infiltration of contami-
nating and strong substances.
2. Updates.
Pavarini Components reserves the right to update
its product and relative manuals based on techni-
cal progress without prior notice. Please note that
at the time of sale, this manual and relative product
cannot be considered inadequate only because
they are not subject to above-mentioned updates.
3. Technical features.
(Figures F.114.0 and F.115.0)
4. Supply.
Inside the packaging you will find:
1
cooling unit
1
installation, operating and maintenance
manual with CE conformity certificate
1
test certificate
1
drilling template in 1:1 scale
8
M8 nuts
1
8
8.4x24 mm flat washers
2
8
M8x30 mm dowels
3
1
10x5 mm self-adhesive sealing strip
4
...
(figure F. 118.0)
1
4
5. Prior to assembly.
•
During transport and storage the cooling unit
must be kept in the position clearly indicated
on the packaging (figure F.1.0), and must not
be exposed to temperatures higher than
70°C.
•
Upon receipt, check the packaging has not
been damaged during shipping.
•
Ambient air temperature, where the enclo-
sure is to be installed, must be no higher than
50°C and should never exceed the cooling
unit's maximum operating temperature which
is specified on its rating plate. The unit must
be positioned far away from heat sources and
flows of hot air.
•
Make sure switchboard protection level is
IP54 or higher. Should this not be the case
excessive condensation could form. Conse-
quently seal well all areas where cables pass
and all other openings in the enclosure.
•
Check that the external environment does not
contain excessive concentrations of contami-
nating solids and/or strong chemicals.
•
Check that the flows of air leaving and enter-
ing the cooling unit are not obstructed by
walls or objects that are too close. For this
purpose, in the case of the external air flow,
verify the minimum distances (figure F.112.0),
while in the case of the internal air flow, make
sure there are no obstructions caused by the
switchboard components.
•
The supply voltage available must corre-
spond to the features given on the cooling
unit's rating plate.
•
The cooling unit must be installed in the posi-
tion indicated. Maximum permitted deviation
from the vertical is 2°.
•
The cooling unit must be installed with the
enclosure air suction hole in the highest pos-
sible point.
•
Before making the holes and slits on the en-
closure make sure the fixing elements and
couplings will not interfere with the equipment
inside the enclosure itself.
6. Assembly.
Disconnect power before starting any work inside
the
switchboard. The cooling unit is applied exter-
nally to the electric enclosure with the accessories
you will find inside the standard kit supplied with
the unit. Drill the necessary holes and cuts on the
switchboard (figure F.117.0) using the drilling tem-
plate in 1:1 scale supplied with the unit. Affix the
seal on the cooling unit on the electric enclosure
coupling side, following the directions given on the
assembly diagram (figure F.118.0). To lift the cool-
ing unit safely use the two lifting brackets at the top
of the unit (figure F.113.0).
7. Condensate discharge hose.
The condensate which, depending on the ambient
temperature and humidity conditions, forms on the
exchanger that cools the enclosure air, is not a
malfunction but a normal phenomenon of the cool-
ing unit. The condensate is taken outside through
a hose at the bottom of the cooling unit.
plastic pipe to this hose that will take the conden-
sate somewhere else, discharging it where there
can be no slipping hazard for people. In this case,
make sure the condensate flows without any hin-
drance. Avoid horizontal lengths of more than 0.5
metres, lengths with a reverse gradient and the
accidental
formation of traps (figure F.119.0). The
end of the condensate discharge hose must al-
ways be free, never immersed, so never place the
end of the discharge hose inside condensate col-
lection trays (figure F.120.0). If the cooling unit is
used with the doors of the enclosure open, exces-
sive quantities of condensate will form and this is
an unauthorised condition of use (figure F.121.0).
We suggest using a position switch on the door
that will stop the cooling unit if the door is opened.
8. Electrical connection.
Attention! The electrical connection must be
done by specialised and authorised personnel.
Switch power off to the enclosure before mak-
ing the connection. Check that the available sup-
ply voltage corresponds to the characteristics
given on the cooling unit's data plate. The supply
of electricity to the cooling unit must be protected
by an isolating device/fuse or circuit breaker with a
distance between the contacts of at least 3 mm
when open according to the indicated settings (fig-
ure F.115.0). Wire to the terminal board following
the instructions on the wiring diagram and paying
attention to the terminals. After a stop the cooling
unit must not be started again immediately. For
this reason we suggest using a timed control that
delays restarting 3 minutes. Disconnect the cooling
unit before electrically testing the enclosure.
9. First start up and adjustment.
If, prior to installation, the cooling unit was left in an
incorrect position (figure F.1.0), wait at least 8
hours before switching it on otherwise 30 minutes
are more than enough for the oil to return to the
compressor after which the cooling unit can be
powered. The enclosure air suction fan starts
working immediately, rendering the temperature
even inside the enclosure. If this temperature is
higher than the threshold value set on the adjust-
ment thermostat both the compressor and external
air fans start working, causing the cooling cycle to
start. The latter stops when the inside temperature
reaches the low limit of the operating differential
that has a fixed value of 4 K. The thermostat is fac-
tory set at 35 °C.
To alter the set temperature, ac-
cess the thermostat located inside the electric box
at the bottom of the cooling unit (figure F.122.0).
With
the graduated scale, from 0 to 40 °C, you
may alter the set temperature as wanted. To save
energy and minimise the production of condensa-
tion we recommend not to go below 30 °C.
10. Maintenance.
Caution! Before embarking on any mainte-
nance work, switch current off to the enclo-
sure. The cooling unit is the low maintenance type.
6
The only jobs that need doing are the internal
components with compressed air at a maximum
pressure of 4 bar (figure F.123.0) and which
should be checked regularly.
Job
Check and clean the air filter,
changing it if necessary
Check the external air heat
exchanger and clean if
necessary
Check effectiveness of the
condensate discharge
Check the fans for any
overheating or excessive
vibrations
Connect a
Any repairs that may need doing must only be
done by specialised and authorised personnel and
using original spare parts only.
11. Technical information.
11.1 Operating principle.
The cooling unit for electric enclosures works on
the basis of a refrigeration circuit consisting of four
main components: compressor, evaporator, con-
denser and expansion device (figure F.124.0). The
circuit is hermetically sealed and the refrigerant
circulates inside it. The refrigerant used is R407C,
chlorine free and harmless for the ozone layer. The
unit is divided into two hermetically separated sec-
tions where the ambient air and enclosure air do
not come into contact with one another and are
treated separately. The compressor (CP) com-
presses the refrigerant and takes it to a high pres-
sure and high temperature. The compressor then
pushes the refrigerant through a heat exchanger
coil, called condenser (C), where it is cooled by
ambient air thus passing from the gas to the liquid
state. In this state it is collected by the liquid re-
ceiver (R) from where it then goes through the
thermostat valve (EXP) where it nebulises It is then
received by the heat exchanger coil, called evapo-
rator (E), by means of which it absorbs heat from
the enclosure air and passes from a
gas. The enclosure is cooled down in this manner.
The gas is then drawn back into the compressor
and the above described cycle is repeated.
11.2 Safety devices.
The refrigeration circuit is fitted with a high pres-
sure (Hp) and a low pressure (Lp) safety switch
(figure F.124.0) set at the cooling unit's maximum
and minimum working pressure respectively. If ei-
ther one of these two thresholds is exceeded, the
pressure switch interrupts compressor operation.
These pressure switches are the automatically re-
settable type. The fans and compressor have a
thermal cut-out switch inside that stops them in the
case of anomalous over temperatures.
11.3 Energy saving.
To optimise the saving of energy, the cooling unit
is fitted with a thermostat that regulates condenser
ventilation. When the outside temperature drops
below 30°C (fixed setting) one of the two fans on
the condenser side is stopped.
11.4 Disposal.
Caution! The cooling unit contains R407C re-
frigerant and small quantities of lubricating oil.
These substances pollute and must not be
dumped. Replacement, repairs and final disposal
must be seen to by experts.
NOTE
Keep the documentation in a dry place
Frequency
Every two
weeks
Every 3
months
Every 3
months
Every 6
months
liquid state to
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