Cooling Unit Application; Intended Use; Improper Use; Supply - ORELL EMO Serie Manual De Montaje Y Servicio

1. Cooling unit application

The EMO series cooling units described in this manual
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 consequence, cable entry points or any other
openings in the cabinet should be well sealed.
To ensure correct operation, the specified scheduled
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
contaminants
- 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 switch-
board components as regards the internal 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 (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

ORELL Tec AG reserves the right to update its
products and the corresponding manuals based
on techni-cal progress without prior notice. Please
note that at the time of sale, this manual and the
correspon-ding 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 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 inside
the switchboard. The cooling unit must be instal-
led on the outside of the electrical switchboard.
Depending on the installation option, drill the
holes and make the necessary cuts in the switch-
board (figure F.06) using the drilling template
supplied with the unit. Fit the sealing strip on the
cooling unit on the side connected to the enclosu-
re and follow the assembly diagram (figure F.06).

7. Condensate discharge hose

The condensate which, depending on the ambient
temperature and humidity conditions, forms on
the heat exchanger which cools the enclosure air,
is not a malfunction but a normal phenomenon of
the cooling unit. In models EMO04 - EMO06, this
condensate is taken outside through a hose at the
bottom of the cooling 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
(figure 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 conden-
sate evaporation device which operates via the hot
(outlet) tube of the compressor (Fig. F.13). These
models nevertheless have an emergency condensa-
te 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
condition of use (figure F.09). To avoid this problem,
we suggest using a position switch on the door, so
that the cooling unit stops if the door is opened.
5

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 characteristics given on
the cooling unit's data plate. The power supply must
be protected using appropriate time-delay fuses
(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 included 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 restart-
ing 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 minutes 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 temperature even inside the enclo-
sure. If this temperature is higher than the thresh-
old 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 differential
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 cooling unit.
the graduated scale, from 20 to 46 °C, you may
alter the set temperature as wanted (fig ure
To save energy and minimise the produc tion of
condensation we recommend not to go be low
30 °C.
ENG
With
F.05).