1. Cooling unit application
The
EMO
series cooling units described in this
manual are designed and built to cool the air in-
side electrical switchboards in order to protect
components sensitive to thermal shock.
At the same time, the cooling units provide
IP54
ingress protection against contaminating and
aggressive/corrosive substances.
1.1 Intended use
The
EMO
cooling unit must be used:
- For cooling electrical switchboards for external
use
- With external air temperature between a mini-
mum of -20°C and a maximum of +50°C (+55°C
for units where this is expressly indicated on the
data plate)
- Within the voltage supply limits indicated on the
data plate of the cooling unit and also given in
chapter
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, exces-
sive condensation build-up may occur. As a con-
sequence, cable entry points or any other open-
ings in the cabinet should be well sealed.
To ensure correct operation, the specified sched
-
uled maintenance operations (see section
10
)
must be performed regularly. Incorrect or care-
less use may cause irreparable damage to the
cooling unit and may lead to hazardous situa-
tions.
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 con-
taminants
- With the doors of the electrical switchboard
open, or installed on enclosures without a mini-
mum
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 ag-
gressive 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 al-
lowed 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 switchboard components as regards the in-
ternal air flow.
2. Supply
Inside the packaging you will find:
1 Cooling unit
1 Installation, operation and maintenance manual
1 CE conformity certificate
1 Test certificate
1 A4 drilling template
1 Installation kit containing (
F.04
):
- Flanged nuts (
p.1
)
- Flat washers (
p.2
)
- Grub screws (
p.3
)
1 Self-adhesive sealing strip (
F.04, p.4
)
Handling brackets (
F.03
)
3. Updates
Pavarini Components reserves the right to up-
date its products and the corresponding man-
uals based on technical progress without prior
notice. Please note that at the time of sale, this
manual and the corresponding product may not
be considered 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, use the
handling brackets installed on the top of the 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 en-
closure air intake hole in the highest possible
point.
Ensure the fixing elements and couplings will
not interfere with the equipment inside the en-
closure itself.
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 switchboard using the stand-
ard accessory kit supplied with the unit. Drill the
holes and make the cuts required in the switch-
board (figure
F.04
) using the supplied drilling
template.
Fit the sealing strip on the cooling unit on the
side connected to the enclosure and follow the
assembly diagram (figure
F.04
).
7. Condensate discharge hose
The condensate which, depending on the ambi-
ent temperature and humidity conditions, forms
on the heat exchanger which cools the enclo-
sure air, is not a malfunction but a normal phe-
nomenon of the cooling unit.
The condensate is taken outside the cooling unit
via a hose at the bottom of the unit (figure
11.B
).
A plastic hose must be connected to this outlet 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 (figure
F.05
). The
end of the condensate discharge hose must al-
ways be free and not underwater, so never place
the end of the discharge hose inside a conden-
sate collection container (figure
F.07
).
The condensate drain connection can also be
taken out the side of the cooling unit by modi-
fying the position of the internal rubber tube (fig
-
ure
F.11A
).
If the cooling unit is used with the doors of the
enclosure open, excessive quantities of conden-
sate will form and this is an unauthorised condi-
tion of use (figure
F.07
). We suggest using a po-
sition switch on the door connected to the cool-
ing unit’s digital input to stop the unit if the door
is opened. (See section
8.2
)
8. Electrical connection
8.1 Safety
Warning! Electrical connections must only
be performed by specialised and authorised
personnel. Switch power off to the enclosure
before making the connection.
Check that
there is no power to the switchboard and that
the supply voltage corresponds to the character-
istics given on the cooling unit’s data plate. The
power supply must be protected using appropri-
ate time-delay fuses (type T) or circuit breakers
with K-curve, as per the indications given in table
F.14
. Connect the power-supply cable as shown
in figure
F14
. Ensure you respect the sequence
R-S-T. Disconnect the cooling unit before per-
forming testing on the enclosure.
8.2 Alarm management cable
(figure
F.13
)
The alarm signal output from the cooling unit can
be taken from wires
80
and
81
using a two-pole
cable
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 min-
utes is more than enough time for the oil to re-
turn to the compressor, after which the cooling
unit can be powered up. The enclosure air intake
fan starts working immediately, making the tem-
perature inside the enclosure even.
If this temperature exceeds the set point on the
regulator thermostat, both the compressor and
external air fan will turn on, causing the cool-
ing cycle to start. This then stops when the in-
side temperature reaches the lower limit of the
operating temperature differential, which has a
fixed value of 4 K. The thermostat is factory-set
to 35°C. Use the thermostat located inside the
cooling unit to adjust the temperature set-point.
The graduated scale allows you to set the re-
quired temperature between 20 and 46 °C (fig
-
ure
F.10
). In order to save energy and minimise
the production of condensate, it is nevertheless
recommended it not be set below 30 °C.
10. Maintenance
Warning! Caution! Before embarking on any
maintenance work, cut the current to the en-
closure.
The cooling unit is the low maintenance type.
The only maintenance required is for the internal
components, which should be checked regular-
ly, as indicated in the table given in this section,
and cleaned with compressed air at a maximum
pressure of 4 bar (figure
F.08
). Any repairs that
may need doing must only be performed by spe-
cialised and authorised personnel.
Job
Frequency
Check, clean and, if necessary,
replace the air filter
Every 2
weeks
Check the external air heat
exchanger and clean if necessary.
Every 3
months
Check effectiveness of the con-
densate discharge.
Every 3
months
Check the fans for any overheat-
ing or excessive vibrations.
Every 6
months
6
ENG
