Condensate Discharge Hose; Electrical Connection; Safety; Two-Phase Models With Autotransformer - ORELL FLY 11 Serie Manual De Montaje Y Servicio

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.
The cooling unit is equipped with a conden-
sate evaporation device which uses the hot
(delivery) tube of the compressor (figure F.14),
and has an emergency discharge which can be
taken outside the 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.
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.10). We suggest using
a position switch on the door connected to the
cooling unit's digital input to stop the unit if the
door is opened (see section 8.4).

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.15. Connect the power-supply cables
to the black connector included with the unit,
following the indications given in figure F.06.
Disconnect the cooling unit before performing
testing on the enclosure.

8.2 Two-phase models with autotransformer

(FLY11K / FLY15K)
These two-phase models can operate with two
different supply voltages: 460V 2~ 50-60Hz
and 400V 2~ 50-60Hz. If the available power
supply is 460V 2~ 50-60Hz, connect terminals
L1(0) and L3(460) 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 Three-phase models

(FLY20H / FLY25H / FLY32H)
Three-phase models with 460V 3~ 60 Hz
power supply can also be powered with a
400V 3~ 50 Hz supply by modifying the
connection of the cables to the internal
terminal block as show in figure F.08.
8.4 Alarm pins
(figure F.07)
All input/output signals from the electronic
control 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
available on terminals 3 and 4
The cooling unit's electronic control unit is
programmed to generate an alarm when the
digital 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.0 1), wait at
least 8 hours before switching it on. Other-
wise, 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 intake fan starts working imme-
diately, 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 reaches 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 minimise the pro-
duction of condensate, it is nevertheless
recommended it not be set be low 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 thermostat and how to
program it.
ORELL Tec AG shall be in no way held liable
for any alterations the customer may make to
the default parameters if they have not
received authorisation to do so.
Any modifications made by unqualified
personnel may cause damage to the unit
or interruptions in its operation.

10. Maintenance

Warning! Caution! Before embarking on any
maintenance work, cut the current to the
enclosure.
Job Frequency
Check the external air Every 3
heat exchanger and months
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.
The cooling unit is the low maintenance type,
so no filter change is required. The only mainte-
nance required is for the internal components,
which should be checked regularly, as indicated
in the table given in this section, and cleaned
with compressed air at a maximum pressure
of 4 bar (figure F.11).
An intake filter may be fitted for use in particu-
larly dirty environments. The filter is an optional
extra which is not supplied as standard (figure
F.13).
Any repairs that may need doing must only
be performed by specialised and authorised
personnel.
6

11. Technical information

11.1 Operating principle

The cooling unit for electrical switchboard
enclosures works on the basis of a refrige-
ration circuit consisting of four main compo-
nents: compressor, evaporator, condenser and
expansion device (figure F.12). The circuit is
hermetically sealed and the refrigerant circula-
tes inside it. The refrigerant used is R134a,
chlorine free and harmless for the ozone layer.
The unit is divided into two hermetically
separated sections where the ambient air and
enclosure air do not come into contact with
one another and are treated separately. The
compressor (CP) compresses the refrigerant,
taking it to a high pressure and high tempera-
ture. The compressor then pushes the refrige-
rant through a heat-exchanger coil, called the
condenser (C), where it is cooled by ambient
air, thus passing from the gas to the liquid
state. In the liquid state it then passes
through the expansion valve (EXP), vaporising
at the outlet as it is now at a much lower
pressure. It is then received by the heat
exchanger coil, called the evaporator (E), by
means of which it absorbs heat from the
enclosure air and passes from a liquid state
to gas. The enclosure is cooled down in this
manner. The gaseous refrigerant is then drawn
back into the compressor and this cycle is
repeated.

11.2 Safety devices.

The refrigeration circuit is fitted with a high-
pressure safety switch P (figure F.12) set to
the maximum working pressure of the cooling
unit. If this threshold is exceeded, the pressure
switch stops the compressor working.
It resets automatically. The fans and compres-
sor have an (internal or external) thermal
cut-out switch that stops them in the case of
overheating.

11.3 Disposal

Caution! The cooling unit contains R134a
refrigerant and small quantities of lubri-
cating oil. These are polluting substances and
must not be dumped. Replacement,
repairs and final disposal must be performed
by experts.
At the end of the unit's life cycle/production,
the following steps must be taken:
- Drain off the refrigerant contained in the
cooling system
- Drain off the oil contained in the compressor.
These two operations must be performed by
specialised personnel using dedicated
equipment for recovery of oils and gases so
that they are not dispersed into the
environment.
- Disassemble and divide the internal compo-
nents in order to separate recyclable materials
(steel, copper, aluminium, plastic etc.). In any
case, applicable legislation in the country in
which the product is used must always be
followed.
NOTE
Keep the unit's documentation in a safe,
dry place.
ENG