11
GENERAL FEATURES
Accessories
Spring vibration dampers
Allow to reduce the transmission to the unit support plane of the mechanical vibrations generated by the com-
pressor and by the fans in their normal operating mode.
In order to keep the insulation degree higher than 90%, the number and the features of the dampers are different
according to the model and the constructive configuration.
When this accessory is chosen, flexible connections must be used on all the aeraulic and hydraulic connections.
Moreover the height of the dampers, fitted between the basement of the unit and the support plane, must be
taken into account to design correctly the air ducts.
External coils
protection grilles
Protect the external surface of the finned coils.
High and low
pressure gauges
Each refrigerant circuit is equipped with two analog gauges, placed inside the refrigerant circuit compartment,
that detect the pressure in the compressor inlet and outlet pipes.
Remote control
It is suitable for wall mounting and reports all the functions available on the user interface normally placed on the
unit. It therefore allows the complete remote control of the unit.
Remote thermostat
It is suitable for wall mounting and consists of a simplified remote user interface compared to the standard one
normally placed on the unit. It allows to select the operating mode, set a deviation respect to the active set-point
and visualize the operating status and the presence of active alarms.
Modbus serial interface
on RS485
It allows to communicate with the unit controller and to view the operating conditions of the unit through Modbus
communication protocol. The RS485 serial line ensures the signal quality up to distances of about 1200 metres
(that can be extended by means of proper repeaters).
Programmer clock
It allows the unit to be turned on and off according to a set program, through the digital input available on the unit
wiring board (remote on-off).
Phase sequence and
voltage controller
It checks not only the presence and correct order of the power supply phases but also the voltage level on each
phase and avoid the unit to operate with voltage levels outside the permitted limits.
Roof curb
Metal structure to be applied to the units with downwards air flow in order to facilitate the installation and to
guarantee a perfect tight between the air duct and the unit itself.
The correct positioning of the roof curb requires an accurate finishing of the installation area.
Enthalpic free cooling
It allows to increase the seasonal efficiency of the unit through a more extended
and optimized use of the free cooling function, obtained considering the enthal-
pies of the outdoor and of the return air instead of the simple temperatures. The
measure of the relative humidity (of the outdoor and of the return air), necessary
for the enthalpy calculation, is realized through two capacitive humidity sensors.
Air quality control (CO
2
)
It manages the motorized dampers opening (in the versions in which they are
present) according to the CO
2
percentage of the ambients to be conditioned,
increasing, if necessary, the outdoor fresh air percentage.
If the (thermal or enthalpic) free cooling function is enabled the dampers ope-
ning is obtained by the combination of the two control logics.
Special filters
To complete the standard filtering section it is possible to add rigid pocket fil-
ters of various efficiency (from F6 to F9 according to EN 779) or active carbon
filters with F7 filtering class. The filter supporting frame is studied to guarantee
a perfect tight and an easy lateral extraction of the filters for the maintenance
operations.
Available only for the units with V1, V2 or V3 constructive configuration.
Filters differential pressure switch
It detects the pressure difference between upstream and downstream the filte-
ring section. When the pressure drops exceed the maximum permitted value
(factory set according to the type of filters fitted on the unit) the pressure switch
stops the unit avoiding it to work with an air flow rate excessively low compared
to the one required.
Droplets separator
It is reccomended for units that require air flow rates particularly high compared
to the standard air flow rate and when the medium crossing air velocity is higher
than 2,7 m/s.
It avoids the condensate droplets that are generated on the exchange coil du-
ring cooling mode operation to be dragged. It is equipped with stainless steel
condensate tray with inclined bottom and threaded connector for the discharge.
It is never required if the hot water coil is mounted.
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