TEXA NXT04, Инструкция по установке, эксплуатации и обслуживанию

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9
ENG
NOTICE
Immediately contact TEXA INDUSTRIES S.r.l.
in writing in the event of any damage or other
discrepancies.
5. Installation
WARNING
Disconnect power before starting any work
inside the switchboard.
WARNING
Installation of the machine must be performed
only by authorised and qualified personnel
using appropriate PPE.
CAUTION
Debur holes and slots to prevent cuts, above
all during the installation phase.
Install the cooling unit with the enclosure air intake
hole in the highest possible point.
Ensure the fixing elements and couplings will not
foul the equipment inside the enclosure itself.
If the cooling unit is to be installed on the door of
an electrical switchboard, make sure the door can
take the weight.
The unit must be installed in a vertical position.
Maximum permitted deviation from the vertical is
2°.
5.1 Installation of External Installation Versions
The cooling unit must be installed on the outside
of the electrical switchboard. Drill the holes and
make the necessary cuts in the enclosure (figure
F.04 ) using the drilling template supplied with the
unit. Fit the sealing strip on the cooling unit on the
side connected to the enclosure and follow the
assembly diagram (figure F.04 ).
5.2 Installation of Semi-Recessed Installation
Versions
Thanks to its modular configuration, depending
on requirements the cooling unit can be installed
on the exterior of the electrical switchboard (figure
F.05 ) or semi-recessed (figure F.06 ) without the
need for further accessories. Depending on the
installation option, drill the holes and make the
necessary cuts in the switchboard using the drilling
template supplied with the unit. Fit the sealing strip
on the cooling unit on the side connected to the
enclosure. Follow the installation diagram given,
depending on the required installation type.
6. Condensate runoff pipe
The condensate which, depending on the ambient
temperature and humidity conditions, forms on the
cooling unit which cools the enclosure air, is not
a malfunction but a normal phenomenon of the
cooling unit. In models NXT04-NXT06-NXT08 , this
condensate is taken outside through a hose at the
bottom of the cooling unit. It is possible to screw
on the hose barb supplied with the machine (figure
F.10 ) on which an 8 mm ID hose can be fitted to
carry the condensate to another position, so that
the discharge can be made at a point where it
does not represent a slipping hazard to 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 runoff pipe must always be free
and never underwater. The end of the condensate
runoff pipe must therefore not be placed inside a
condensate collection container (figure F.08 ).
Models NXT10 to NXT60 are fitted with a
condensate evaporation device which operates
via the hot (outlet) tube of the compressor
(figure 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 condition of use (figure
F.09
). 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
7.3 )
7. Electrical Connection
WARNING
The electrical connection and any work on the
system or on electrical components must be
performed solely by specialised and authorised
personnel in compliance with electrical code
and any other applicable regulations.
WARNING
Isolate the power to the enclosure during the
connection phase.
WARNING
Ensure the machine is correctly earthed.
CAUTION
Make sure the supply voltage is compatible
with the voltage on the cooling unit’s rating
plate.
CAUTION
The power supply must be protected upline
of the machine using appropriate time-delay
fuses (type T) or circuit breakers with K-curve,
per the indications given in table F.13.
Connect the supply cable in accordance with
figure F.14 .
7.1 Two-Phase Models
The 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.14 ). 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.
The UL-listed models are fitted with fuses on
the 460V 2~50-60Hz supply line located in the
corresponding fuse holders in the rear part of the
cooling unit (figure F.16 ).
7.2 Three-phase models
The three-phase UL-listed models with 460V 3~
60 Hz power supply can also be powered with
400V 3~ 50 Hz voltage by opening the rear panel
and modifying the connection of the cables on
the quick-release connector (figure F.17 ). On the
contrary, the models with only CE marking are
factory set for 400V 3~ 50 Hz and can be powered
with 460V 3~ 60 Hz voltage by modifying the
connection with the same procedure described
previously.
The UL-listed models are fitted with fuses on
the 460V 3~ 60Hz supply line located in the
corresponding fuse holders in the rear part of the
cooling unit (figure F.16 ).
7.3 Alarm Pins
(figure F.15 )
The input/output signals from the electronic control
unit are managed via the alarm pins:
- Alarm signals from the electronic control unit can
be taken from positions 1-2-3; in the event of an
alarm, the digital output relay will change state
- A digital input for voltage free contacts is available
on terminals 4-5
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 4 and 5 together with a
cable.
7.4 Sequencing (optional)
(figure F.17 )
It is possible to connect two cooling units together
in sequence via the red 4-pole connector on the
rear of the machine; the cable is not supplied as
standard.
See the control unit manual to set the necessary
parameters.
7.5 Modbus (optional)
(figure F.18 )
It is possible to make a modbus connection via the
4-pole connector on the rear of the machine; the
cable is not supplied as standard.
See the control unit manual to set the necessary
parameters.
8. First Start-Up and Regulation
CAUTION
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.
Once voltage is applied, the enclosure air
intake fan will operate intermittently, 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 setpoint
can be set between 20°C and 45°C.
NOTICE
To save energy and minimise the production
of condensate, we recommend not setting the
setpoint below 30 °C.
8.1 Electronic Thermostat
The NXT04 model is fitted with a TX050 electronic
thermostat. See the specific manual C17000199
for the functions of this thermostat and how to
program it.
8.2 Electronic Board
All other models in the NXT range are equipped
with an electronic board and a display on which the
operator can modify the machine parameters. See
the specific manual C17000905 for the functions
of this thermostat and how to program it.
NOTICE
TEXA INDUSTRIES S.r.l. 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.