TEXA EMO Series Installation, Operation And Maintenance Manual page 4

ENG
1. Introduction
This manual contains general informations valid
for each model of EMO range. Specific informa­
tions as dimensional drawing, wiring diagram,
technical data are contained in the specific tech­
nical document issued for each singol unit.
2. Intended use and operating limits for the
cooling unit
The cooling units described in this manual are
de signed and built to cool the air inside outdoor
enclosures in order to protect components sensi­
tive to thermal shock and, at the same time, pro­
viding an IP54 protection level against the infil­
tration of contami nating and strong sub stances.
The ambient air temperature must be included
from minimum ­20°C to maximum +50°C (+55°C
only if it is indicated on the data plate) for a prop­
er functioning.
3. Updates.
Pavarini Components reserves the right to up­
date its product and relative manuals based on
techni cal progress without prior notice. Please
note that at the time of sale, this manual and rel­
ative product cannot be considered inade quate
only because they are not subject to above­men­
tioned updates.
4. Supply
Inside the packaging you will find:
cooling unit
1
installation, operating and mainte­
1
nance manuall
CE conformity certificate
1
test certificate
1
nuts
6/8
1
flat washers
6/8
2
dowels
6/8
3
10x5 mm self­adhesive sealing strip
1
4
piece of flexible hose for discharging
1
5
condensate 12x2x100 mm
(figure F.7)
1 4
...
(figure F.9)
5
5. Prior to assembly.
• During transport and storage the cooling
unit must be kept in the position clearly in­
dicated on the packaging (figure F.1.0), and
must not be exposed to temperatures high­
er 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 high­
er than 50°C and should never exceed
the cooling unit's maximum operating tem­
perature which is specified on its rating
plate. The unit must be positioned far away
from heat sources and flows of hot air.
•
Make sure enclosure 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 enclo­
sure.
•
Check that the external environment does
not contain excessive concentrations of
contami nating solids and/or strong chemi­
cals.
• Check that the flows of air leaving and en­
ter 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 (fig­
ure F.2), 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 with the
en closure air suction hole in the highest pos­
sible point.
If the cooling unit has to be installed on
a door, make sure the door can take the
weight.
Before making the holes and slits on the
enclo sure 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 in side
the switchboard. The cooling unit can be applied
externally on the electric enclosure without the
need for any additional accessories (just those
you will find inside the standard kit supplied with
the unit). Drill the holes and make the necessary
cuts on the switchboard using the drilling tem­
plate supplied with the unit. Fit the sealing strip
on the cooling unit on the side con nected to the
enclosure and follow the assembly diagram (fig­
ure F.7). To lift the cooling unit safely use the two
eyebolts or the two lifting brackets
the cool ing unit (figure F. 3).
7. Condensate discharge hose.
The condensate which, depending on the am­
bient temperature and humidity conditions, forms
on the exchanger that cools the enclo sure air, is
not a malfunction but a normal phe nomenon of
the cooling unit. The condensate is taken out­
side through a hose at the bottom of the cooling
unit. The transparent plastic hose, supplied with
the unit, must be connected to this discharge
(figure F.9). This plastic hose can be connect­
ed to an other one with the same diameter to car­
ry the con densate to another point so when it is
dis charged it is where there can be no slipping
hazard for per sonnel. In this case, make sure
the condensate flows without any hindrance.
Avoid horizontal lengths of more than 0.5 me­
tres, lengths with a re verse gradient and the ac­
cidental formation of traps (figure F.5). The end
of the condensate discharge hose must always
be free, never im mersed, so never place the end
of the discharge hose in side con densate collec­
tion trays (figure F.6). If the cooling unit is used
with the doors of the enclosure open, excessive
quantities of con densate will form and this is an
unauthorised con dition of use (figure F.8).
We suggest using a position switch on the
door that will stop the cool ing unit if the door is
opened.
8. Electrical connection.
8.1 Safety
Attention! The electrical connection must be
done by specialised and authorised person­
nel. Switch power off to the enclosure be fore
mak ing the connection. Check that the availa­
ble supply voltage corre sponds to the character­
istics given on the cooling unit's data plate. The
supply of electric ity to the cooling unit must be
protected by an isolating de vice / fuse or circuit
breaker with a distance between the contacts of
at least 3 mm when open ac cording to the indi­
cated settings. Connect the cables following the
instructions on the wiring diagram. After a stop
the cooling unit must not be started again imme­
4
diately. For this reason we sug gest using a timed
control that delays restarting 3 minutes. Discon­
nect the cooling unit before electri cally testing
the enclo sure.
8.2 Versions with an autotransformer
(EMO..G)
These bi­phase versions are set for two supply
voltages: 440V 2~ 50­60Hz and 400V 2~ 50­
60Hz. If the available power supply voltage is
440V 2~ 50­60Hz connect terminals L1(0) and
L3(440) of black plug (figure F.4). If the available
power supply voltage is 400V 2~ 50­60Hz con­
nect L1(0) and L2(400) to same plug.
9. First start up and adjustment.
If, prior to installation, the cooling unit was left in
an incorrect position (figure F.1), wait at least 8
hours before switching it on otherwise 30 min­
utes are more than enough for the oil to re turn 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 com pressor and exter­
nal air fan start working, causing the cooling cy­
cle to start.
The latter stops when the inside temperature
reaches the low limit of the operating differen­
on the top of tial that has a fixed value of 4 K. The thermostat
is factory set at 35 °C.
cess the thermostat.
from 20 to 46 °C, you may alter the set tempera­
ture as wanted
minimise the produc tion of condensation we rec­
ommend not to go be low 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 so no filter change is required. The on­
ly jobs that need doing are the internal compo­
nents with com pressed air at a maximum pres­
sure of 4 bar (figure F.11) and which should be
checked regularly.
Job
Check the external air
heat exchanger
clean if necessary.
Check effectiveness
of the condensate dis­
charge.
Check the fans for any
overheating or exces­
sive vibrations.
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, evapo rator,
con denser and expansion device (figure F.12).
The circuit is hermetically sealed and the refrig­
erant circulates inside it. The refriger ant used is
R134a (or R407C), chlorine free and harmless
for the ozone layer. The unit is divided into two
hermetically separated sections where the am­
bient air and enclosure air do not come into con­
To alter this set value ac­
With the graduated scale,
(fig ure F.10). To save energy and
Frequency
Every 3
and months
Every 3
months
Every 6
months