Cooling Unit Application - TEXA DEK Series Installation, Operation And Maintenance Manual

ENG

1. Cooling unit application

The DEK series cooling units described in this ma-
nual are designed and built to cool the air inside elec-
trical switchboards in order to protect components
sensitive to thermal shock. They also provide IP54
ingress protection against contaminating and aggres-
sive/corrosive substances.
1.1 Intended use
The DEK cooling unit must be used:
- For cooling electrical switchboards
- For roof installation
- Within the temperature and voltage-supply li-
mits indicated on the data plate of the cooling
unit and also given in table F.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 DEK 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 IP 54
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
- Exposed to the elements
- 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 Electronic thermostat manual
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)
2 Connectors, one for the power supply and
one for the signals (F.07)
1 Self-adhesive sealing strip (F.04, p.4)
1 Transparent hose pipe for service condensate
runoff 12x2x2500 mm (F.05, p.5)
1 coloured hose pipe for emergency condensa-
te runoff 12x2x1500 mm (F.05, p.6)
2 condensate runoff pipe elbow joints (F.05,
p.7)
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
-20°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.
Ensure the fixing elements and couplings will not
interfere with the equipment inside the enclosure
itself.
Make sure the roof of the switchboard is able to
withstand its weight. If necessary, reinforce the
switchboard structure.
The unit must be installed in the horizontal po-
sition 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. Drill the holes and make the necessary
cuts in the switchboard (figure F.04) using the
drilling template supplied with the unit. If requi-
red 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 am-
bient 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.
The condensate is conveyed outwards by means
of two runoffs, an emergency one and a service
one, located in the bottom part of the cooling
unit. A piece of transparent plastic hose pipe, 2.5
m long, must be connected to the service ru-
noff. This is included in the supply (figure F.05,
p.5). Cut the piece so it covers the distance from
the fitting as far as the edge of the switchboard
roof. Couple the piece to the elbow joint included
in the supply. Couple the other side of such el-
bow to the remaining part of the pipe, which con-
veys the condensate as far as the base of the
switchboard. Connect a piece of coloured plastic
hose pipe, 1.5 m long, to the emergency runoff.
This is included in the supply (figure F.05, p.6).
Cut the piece so it covers the distance from the
fitting to the edge of the switchboard roof. Cou-
ple the piece to the second elbow joint included
in the supply. Couple the other side of such el-
bow to the remaining part of the coloured pipe
which conveys the condensate to the side of the
6
switchboard. Make sure the flow of condensate
is not hindered in any way.
Avoid horizontal lengths of more than 0.5 me-
tres, uphill sections and the accidental formation
of traps (figure F.08). The end of the condensate
discharge hose must always be free and not un-
derwater. Never place the end of the discharge
hose inside a condensate collection container
(figure F.09). A position switch is best used on
the door which, when connected to the digital
input of the cooling unit, stops the operation of
such unit in case of door opening.
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 befo-
re making the connection. Check that there is no
power to the switchboard and that the supply volta-
ge 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 indications given in figure
F.07. Disconnect the cooling unit before performing
testing on the enclosure.
8.2 Two-phase models with autotransformer
( DEK08G / DEK12G / DEK15G )
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.06). 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.
8.3 Alarm pins
(figure F.07)
All input/output signals from the electronic con-
trol unit are managed via the grey pin:
- Alarm signals from the electronic control unit
can be taken from terminals 1 and 2
- A digital input for voltage free contacts is avai-
lable on terminals 3 and 4
The cooling unit's electronic control unit is pro-
grammed to generate an alarm when the digi-
tal input is open. When the digital input is not
being used, it is therefore necessary to bridge it
by connecting terminals 3 and 4 of the grey pin
together with a 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 mi-
nutes 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 inta-
ke fan starts working immediately, making the
temperature inside the enclosure even. If this
temperature exceeds 2K above the set point,
both the compressor and external air fan will
turn on, causing the cooling cycle to start. This
then stops when the inside temperature rea-
ches the set point. The thermostat is factory-set
to 35°C. The set point can be set to between
20°C and 50°C. In order to save energy and mi-
nimise the production of condensate, it is never-
theless recommended it not be set below 30 °C.
9.1 Electronic thermostat
9.1.1 Setting the set point
The cooling unit is fitted with a TX050 electronic
thermostat. See the specific manual C17000199
included with the unit for the functions of this