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1. Cooling unit application
The EMO series cooling units described in this ma-
nual are designed and built to cool the air inside
outdoor electrical switchboards in order to protect
components sensitive to thermal shock. They also
provide IP55 protection level against the infiltration of
contaminating and aggressive/corrosive substances.
1.1 Intended use
The EMO cooling unit must be used:
- For cooling outdoor electrical switchboards
- With outdoor air temperature included between
minimum -20°C and maximum +50°C (+55°C
only if stated on the data plate)
- With proper supply voltages limits indicated on
the data plate (F.06, pos. 5) of the cooling unit
and also given in chpater 14 of this manual
- Away from any sources of heat or hot air
- In an environment with adequate air exchange
- On switchboards with IP54 rating or higher. If
these requirements are not respected, excessive
condensation build-up may occur. As a conse-
quence, cable entry points or any other openings
in the cabinet should be well sealed.
To ensure correct operation, the specified schedu-
led maintenance operations (see section 10) must
be performed regularly. Incorrect or careless use
may cause irreparable damage to the cooling unit
and may lead to hazardous situations.
1.2 Improper use
The EMO cooling unit must NOT be used:
- Under any condition except those described in
section 1.1
- Outdoors, with excessive concentration of solid
contaminants and/or aggressive chemical conta-
minants
- With the doors of the electrical switchboard open,
or installed on enclosures without a minimum IP54
rating, due to excessive condensate formation
- With the temperature set below the dew point of
the ambient air
- In explosive atmospheres, or those with aggres-
sive chemicals or high concentrations of dust or oil
suspended in the air
- In potentially inflammable atmospheres
- With the condensate line closed or blocked off, or
in any case in which the condensate is not allowed
to run off freely
- Without the front panel
- With the cooling unit intake and outlet air flows
obstructed by walls or objects that are too close To
this end, check the minimum distances as regards
the external air flow (figure F.02), and make sure
there are no obstructions caused by the switchbo-
ard components as regards the internal air flow.
2. Supply
Inside the packaging you will find:
1 Cooling unit
1 Installation, operation and maintenance ma-
nual
1 CE conformity certificate
1 Test certificate
1 A4 drilling template
(F.06, p.4)
1 Installation kit containing (F.06):
- Flanged nuts (p.1)
- Flat washers (p.2)
- Grub screws (p.3)
1 Connector, for the power supply (F.04)
1 Self-adhesive sealing strip (F.06, p.4)
1 Flexible hose for condensate drainage
12x2x100 mm (F.10)
Lifting eyebolts (F.03)
3. Updates
Pavarini Components reserves the right to upda-
te its products and the corresponding manuals
based on technical progress without prior notice.
Please note that at the time of sale, this manual
and the corresponding product may not be con-
sidered inadequate only because they are not
subject to the above-mentioned updates.
4. Technical features
(figures F. 14 and F. 15)
The unit's technical features and CE marking are
given on the data plate attached to the cooling
unit.
5. Transport and handling
During transport and storage the cooling unit
must be kept in a vertical position, as indicated
on the packaging (figure F.01), and must not be
exposed to temperatures above 70°C or below
-30°C. Upon receipt, check that the packaging
has not been damaged during shipping.
To lift the cooling unit in a safe manner the two
supplied M6 eyebolts may be used; these should
be fitted into the threaded inserts located on the
top of the cooling unit (figure F.03).
6. Installation
Installation of the unit should only be performed
by qualified and authorised personnel.
The cooling unit must be installed with the enclosure
air intake hole in the highest possible point.
Ensure the fixing elements and couplings will not
interfere with the equipment inside the enclosure
itself.
If the cooling unit is to be installed on a door,
make sure the door can take the weight.
The unit must be installed in the vertical position
indicated. Maximum permitted deviation from
the vertical is 2°.
Disconnect power before starting any work in-
side the switchboard. The cooling unit must be
installed on the outside of the electrical switch-
board. Depending on the installation option, drill
the holes and make the necessary cuts in the
switchboard (figure F.06) using the drilling tem-
plate supplied with the unit. Fit the sealing strip
on the cooling unit on the side connected to the
enclosure and follow the assembly diagram (fi-
gure F.06).
7. Condensate discharge hose
The condensate which, depending on the am-
bient temperature and humidity conditions,
forms on the heat exchanger which cools the
enclosure air, is not a malfunction but a nor-
mal phenomenon of the cooling unit. In models
EMO04 - EMO06, this condensate is taken out-
side through a hose at the bottom of the coo-
ling unit. The transparent plastic hose, supplied
with the unit, must be connected to this outlet
(figure F.10). This plastic hose can be connected
to another one with the same diameter to carry
the condensate to another point, allowing it to
be discharged where there can be no slipping
hazard for personnel. In this case, make sure the
condensate flows without any hindrance. Avoid
horizontal lengths of more than 0.5 metres, uphill
sections and the accidental formation of traps (fi-
gure F.07). The end of the condensate discharge
hose must always be free and not underwater,
so never place the end of the discharge hose
inside a condensate collection container (figure
F.08).
Models EMO08 to EMO40 are fitted with a con-
densate evaporation device which operates via
the hot (outlet) tube of the compressor (Fig. F.13).
These models nevertheless have an emergency
condensate outlet which can be carried outside as
described above. If the cooling unit is used with the
doors of the enclosure open, excessive quantities
of condensate will form and this is an unauthorised
6
condition of use (figure F.09). To avoid this pro-
blem, we suggest using a position switch on the
door, so that the cooling unit stops if the door is
opened.
8. Electrical connection
8.1 Safety
Warning! Electrical connections must only be
performed by specialised and authorised per-
sonnel. Switch power off to the enclosure be-
fore making the connection. Check that there is
no power to the switchboard and that the supply
voltage corresponds to the characteristics given
on the cooling unit's data plate. The power supply
must be protected using appropriate time-delay fu-
ses (type T) or circuit breakers with K-curve, per
the indications given in table F.14. Connect the
power-supply cables to the black connector inclu-
ded with the unit, following the instructions given
in figure F. 04. After a stop the cooling unit must
not be started again immediately. For this reason
we sug gest using a timed control that delays re-
starting by 3 minutes. Disconnect the cooling unit
before electri cally testing the enclo sure.
8.2 Two-phase models with autotransformer
( EMO06G / EMO08G / EMO10G / EMO12G /
EMO16G )
These two-phase models can operate with two
different supply voltages: 440V 2~50-60Hz and
400V 2~50-60Hz. If the available power supply
is 440V 2~50-60Hz, connect terminals L1(0) and
L3(440) on the terminal board (figure F. 04). If,
on the other hand, the available supply voltage
is 400V 2~50-60Hz, connect terminals L1(0) and
L2(400) on the same terminal board.
9. First start up and adjustment
If, prior to installation, the cooling unit was left in
an incorrect position (figure F. 01), wait at least 8
hours before switching it on. Otherwise, 30 minu-
tes is more than enough time for the oil to return
to the compressor, after which the cooling unit
can be powered up.
The enclosure air suction fan
starts working immediately, rendering the temper-
ature even inside the enclosure. If this tempera-
ture is higher than the threshold value set on the
adjust ment thermostat, both the com pressor and
external air fan start working, causing the cooling
cycle to start.
The latter stops when the inside temperature
reaches the low limit of the operating differen-
tial that has a fixed value of 4 K. The thermostat
is factory set at 35 °C.
To change this set value
access the thermostat on the back of the cool-
ing unit.
With the graduated scale, from 20 to 46
°C, you may alter the set temperature as want-
ed
(fig ure
F.05). To save energy and minimise the
produc tion of condensation we recommend not to
go be low 30 °C.
10. Maintenance
Warning! Caution! Before embarking on any
maintenance work, cut the current to the en-
closure.
Job
Frequency
Every 3
Check the external air
months
heat exchanger and
clean if necessary.
Check effectiveness
Every 3
of the condensate
months
discharge.
Check the fans for any
Every 6
overheating or exces-
months
sive vibrations.
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