CIAT POWERCIAT2 LX, Instruction Manual

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NA13.47 B EN - 28
10.1 Control principle
The compressors are controlled by the Xtraconnect 2
control module based on the cold water return temperature.
It activates or deactivates the compressors.
In the standard configuration, the cold water control sensor
is located on the evaporator water return.
Condensation pressure control:
- Activation or deactivation in series of the fans based on
the high pressure value monitored by the
Xtraconnect
2 control console.
10.2 Xtraconnect 2 control module
All units in the POWERCIAT2 range are fitted with an
Xtraconnect 2 microprocessor-controlled electronic control
and display module.
Main functions:
- Water temperature control.
- There are four control options:
1. Water return difference.
2. PID on the water outlet.
3. Temperature difference according to the outdoor
temperature.
4. Low temperature energy storage.
In the standard configuration, the units use the chilled water
return control:
- Condensation pressure monitoring;
- Compressor discharge temperature monitoring;
- Safety device management;
- Operating settings monitoring;
- Management and equalisation of the compressor
operation times;
- Unit weekly management;
- Individualised diagnostic of each fault.
For a detailed description of all these functions, refer to the
Xtraconnect 2 practical manual.
10.3 Master/Slave control
Master/slave control enables two machines to be managed
in parallel. This requires the 2 machines to be connected
using a bus link and one must be designated as the Master
machine in control of the slave machine.
However, these two machines must be configured separately
as the Master machine does not impose its settings on the
Slave machine. When a machine is configured as the
Master, the settings for the Slave machine are fixed and
cannot be accessed.
The water law for the Master controls both machines.
WARNING : the water laws should ideally be similar since, if
there is a break in communication, each machine becomes
independent (controlled by their own water law).
The "Master" machine sends the following information to
the "Slave" machine:
- On/off;
- Control temperature.
The Master machine will not have access to detailed
information about the Slave machine (fault details, operating
readings, machine parameters, read only parameters, etc.)
and vice versa.
For more information, refer to the "Master/Slave
management" section in the
Xtraconnect 2 control manual.
10. CONTROL
9.5 Electrical connections
All wiring must be connected in accordance with the codes
and regulations that apply to the installation site (e.g. NFC
15100 in France).
Always refer to the wiring diagram provided with the unit.
Observe the electrical supply specifications indicated on
the data plate.
The voltage must remain within the range indicated:
- Power circuit: 400 V (+/-10 %) - 3 ph - 50 Hz + Earth.
- Control circuit: 230 V (+/-10 %) - 1 ph - 50 Hz + Earth.
Phase unbalance must not exceed 2% and 10% for voltage
and current, respectively.
If any of the above conditions are not met, immediately
contact your energy supplier and make sure the unit is not
switched on until the necessary corrective actions have
been taken. Failure to do so will automatically void the CIAT
warranty.
The cable sizes will be determined by the installer based
on the installation site characteristics and regulations
before any necessary adaptations are defined to facilitate
connection on the site.
Cable sizing criteria:
- Maximum rated current (see § SPECIFICATIONS).
- distance between the unit and its power source.
- protection to be placed at the power source.
- neutral mode.
- electrical connections (see wiring diagram supplied with
the unit).
- temperature to which the wiring is exposed.
- maximum cross section of the disconnect switch (see §
SPECIFICATIONS).
Making the electrical connections:
1. Connect the power circuit.
2. Connect the protective conductor to the earth terminal.
3. Connect the general fault display dry contact and
the automatic operation control dry contact (where
applicable).
4. Interlock the compressors with the accelerator pump.
The automatic operation control must be connected using a
potential-free (dry) contact.
For the customer connection, refer to the unit's dimensional
drawing.
To prevent problems associated with accelerated corrosion,
earth the compressor via the screw on the casing.
IMPORTANT : It is your responsibility to protect the unit from
overvoltage coming from the mains or voltage spikes caused by
lightning. Depending on the geographic location and the type of
mains network (buried or overhead), you may need to install a
lightning rod. Check your local electrical codes and regulations.
Failure to comply with the requirements of standards in force in
the country of installation (e.g. NF C 15100 in France) will void
the CIAT warranty.