BlueBox Omega Sky Xi User manual

Omega Sky Xi
253÷953 kW
General
Water-condensed liquid chillers and heat pumps
for indoor applications; screw compressor with
variable compression ratio and inverter for
capacity modulation.
Congurations
OH: non-reversible heat pump
HPW: reversible heat pump on water side
/LN: low noise version
/XLN: super low noise version
/DC: with total recovery
Strengths
►Max. eciency at partial loads: SEER up to
8,3 and SEPR up to 9,3
►Ecodesign Tier 2 compliant
►Non-ammable refrigerant R513A, with
GWP=573
►Hybrid Falling Film evaporator with low refrig-
erant load
►Variable Vi screw compressor with external
inverter
►Version with chiller and heat pump, each with
optimised operating range
►BlueThink advanced control with integrated
web server. Multilogic function and Blueye®
supervision system. (options)

1
Omega Sky Xi 3
Description of accessories 7
Refrigerant 7
Refrigerant circuit accessories 7
Hydraulic circuit accessories 8
Electrical accessories 11
Network accessories 14
Other accessories 17
Technical specications 19
Ecodesign 23
Electrical specications 29
Electrical specications 30
Flow rate ranges of heat exchangers 31
Operating limits 32
Omega Sky Xi - Omega Sky Xi OH - Omega Sky Xi HPW 32
Noise levels 33
Noise levels 34
Dimensional diagrams 35
Installation advice 36
Water characteristics 36
Glycol mixtures 36
Minimum water content in the system 37
Installation site 38

2

3
OMEGA SKY XI
Omega Sky Xi is a water-condensed liquid chiller for in-
door applications, available in heat pump version also.
This range features a semi-hermetic, inverter-controlled
screw compressor to obtain max. performances at partial
loads, a latest generation Hybrid Falling Film evaporator
with low refrigerant load, and a ooded shell and tube
condenser.
These elements make Omega Sky Xi an extremely per-
forming machine in all operating conditions, which enables
it to largely exceed the targets mandated by the existing
regulations and to ensure max. comfort levels.
REFRIGERANT
Refrigerant R513A standard.
R513A is distinguished by its low environmental impact,
with GWP=573 (*). It is also a non-toxic and non-am-
mable uid: A1 classication in accordance with ASHRAE;
PED 2.
These characteristics make R513A ideal for indoor units;
they also facilitate adoption of the model in places where
there are certain local requirements regarding the envi-
ronmental impact caused by refrigerants.
This has positive eects on transport, operation and main-
tenance and also on overall cost eectiveness, as regards
possible taxation or restrictions on the use of refrigerants
with high environmental impact.
The model can be supplied with refrigerant R134a as op-
tion.
(*) GWP (AR5), pursuant to IPCC V, evaluated over a span
of 100 years.
STRUCTURE
Consists of polyester powder coated hot dip galvanised
sheet steel proles (RAL 9005).
The electrical control panel is made in a polyester pow-
der-coated hot dip galvanised sheet steel box (RAL 7035).
COMPRESSORS
Units t innovative screw compressors with a variable
compression ratio, which ensure optimised operation un-
der all operating conditions.
The BlueThink controller constantly monitors the evaporat-
ing and condensing temperatures of the unit and changes
the compression ratio of the compressors to obtain the
max. achievable eciency.
The compressors in use are designed according to an ex-
clusive BlueBox specication in order to achieve max. e-
ciency both under partial and full load conditions.
Continuous reduction of the output capacity is implement-
ed with a regulation from 25% to 100% in order to achieve
the highest energy eciency levels on the market, with
special reference to cooling applications. The variation of
the compression ratio caused by the sliding of the internal
slide valve, in combination with capacity reduction of the
refrigeration demand by the inverter, allows for the maxi-
misation of the energy eciency of the unit in all operat-
ing conditions.
In addition to managing capacity modulation, BlueThink
also controls all safety devices so that the compressor can
operate within its operating limits at all times and simulta-
neously safeguard its operation and reliability. Compressor
lubrication is ensured by the pressure dierence between
the delivery and the suction lines, thanks to the regulation
action performed by BlueThink.
All the compressors are tted with check valve on delivery
side, metal mesh lter on suction side and electronic pro-
tection with temperature sensors directly inserted in the
windings and on the delivery pipe.
Startup in compressors featuring an inverter is of the “Di-
rect On Line” type with an inverter-controlled acceleration
ramp that minimises inrush currents.
In addition to the obvious energy savings arising from
greater eciency, the use of a full inverter unit also brings
advantages in terms of installation:
• For these units, the cosφ (power factor) is always great-
er than 0.95, therefore making external power factor
correction systems unnecessary.
• The maximum inrush current of the unit is always lower
than its maximum absorbed current (calculated in the
worst operating condition), therefore making the power
cables and line protection devices less onerous.
All the compressors are tted as standard with crankcase
heater and discharge valve.
SOURCE-SIDE HEAT EXCHANGER
Flooded shell-and-tube heat exchanger, with single water
passage on tube side. Steel shell, and tube bundle made
with copper tubes. The heads can be removed for tube
inspection and cleaning. Victaulic couplings on water side
(complete with nipple for connection).
USER-SIDE HEAT EXCHANGER
Latest generation shell and tube heat exchanger Hybrid
Falling Film with two passes.
The new technology combines the features of a traditional
ooded evaporator and the Falling Film evaporator, thus
ensuring low approach temperatures and a low refrigerant
load.
Below is a sample cross-section of the evaporator.

4
The heat exchanger consists of a steel shell insulated with
closed-cell foam material, while the tube bundle is made
with copper tubes. The heads can be removed for tube
inspection and cleaning. Victaulic couplings on water side
(complete with nipple for connection). On the hydraulic
connections of the heat exchanger, there are also pipe
taps for the dierential pressure switch, and wells for the
temperature probes.
REFRIGERANT CIRCUIT
The refrigerant circuit of the unit comprises:
• discharge valve for each compressors
• charging valves
• liquid sight glass
• a solid cartridge dehydrator lter, which can be replaced
on the uid line;
• a hermetic dehydrator lter on the oil recovery line;
• an oil warning light;
• electronic expansion valve
• pressure transducers for reading the high and low pres-
sure values and relevant evaporating and condensing
temperatures
• pressure transducers and a temperature probe designed
to sense the subcooling value after the condenser;
• a high pressure switch;
• a high and low pressure safety valve;
• an oil separator in the delivery line;
• an oil level warning light;
• jet pumps for oil recovery from the evaporator.
The pipes of the refrigerant circuit and the heat exchanger
on the user side are insulated with extruded closed-cell
expanded elastomer.
With reference to the Hybrid Falling Film technology, the
refrigerant subcooling value is checked through the meas-
urement of the temperature and pressure downline of the
condenser, as shown in the picture below:
The electronic expansion valve is designed to oer en-
hanced stability during operation and to maximise the use
of evaporation under all load conditions. This also acts as
shut-o valve on the liquid line, thereby preventing haz-
ardous refrigerant migrations during compressor stops.
ELECTRICAL CONTROL PANEL
The electrical control panel is made in a painted galva-
nised sheet-iron box with forced ventilation and IP21 pro-
tection rating.
The electrical control panel of the basic unit comprises:
• main disconnect switch
• fuses to protect the compressors and the auxiliary cir-
cuits
• compressor contactors
• phase monitor
• potential-free general alarm contacts
• single potential free operating contacts
• microprocessor controller with display accessible from
the outside
• Capacitive backup battery for electronic expansion valve
• AC inverter tted outside the panel
All the electrical cables inside the panel are numbered and
the terminal board dedicated to the customer's connec-
tions is coloured blue so that it can be quickly identied
in the panel.
Standard power supply of the unit is 400V/3~/50Hz
CONTROL BLUETHINK
Programmable microprocessor control, having proprietary
control algorithms.
The control allows the following functions:
• Inverter management
• Vi management
• Electronic valve management
• water temperature adjustment, with outgoing water
control
• freeze protection
• compressor timings
• recording of the log of all machine inputs, outputs and
states
• automatic rotation of compressor starting sequence
• recording of the alarm log
• management of capacity reduction of the compressors
during starting, switching o and load tracking
• management of capacity reduction of the compressors
in the event of operation outside the limits
Connection resources
The control includes the following connection resources:
• RS485 serial port with Modbus protocol
• Ethernet serial port with Modbus protocol; access to in-
tegrated web server
• digital input for remote setting of state (on/o)
• digital input for setting of summer/winter mode (only
for HPW version)
• digital input for selection of double set point
By default, the serial connections present as standard are
enabled only for reading from BMS. Enabling of writing
from BMS is to be requested when ordering.

5
Main functions of the webserver
As standard, the Bluethink controller integrates a web
server with preloaded web page, which is accessed via
password and user management on several levels.
The web page allows the following functions to be car-
ried out (some available only for users with advanced level
rights):
• display of the main characteristics of the unit such as
serial number, size, refrigerant
• display of the general status of the machine: water inlet
and outlet temperatures on user side and source side,
mode, evaporating and condensing pressures, suction
and discharge temperatures
• display of the status of compressors and electronic ex-
pansion valves
• display of graphs of the main quantities, as trends in
real time and also as log data
• display of alarm log
• remote setting of (on/o)
• remote setting of set point
• remote setting of time band
• remote setting of summer/winter mode
Human-Machine Interface
The control has a graphic display that allows the following
information to be displayed:
• water inlet and outlet temperature
• set temperature and dierential set points
• description of alarms
• hour meter of operation and number of start-ups of the
unit, the compressors and the pumps (if present)
• high and low pressure values, and relevant condensing
and evaporating temperatures
• superheating at compressor suction.
For further details on available functions and on displayed
information, you can refer to the specic documentation
of the control.
CONTROLS AND SAFETY DEVICES
All the units are tted with the following control and safety
components:
• double high pressure switch with manual reset for each
compressor
• high pressure safety device with automatic reset, for a
limited number of occurrences, managed by the con-
troller via specic pressure transducer
• low pressure safety device with automatic reset, for a
limited number of occurrences, managed by the con-
troller via specic pressure transducer
• high pressure safety valve
• Low pressure safety valve
• operation probe at the outlet of the user-side heat ex-
changer that also acts as antifreeze probe
• thermal overload protection for compressors
• water dierential pressure switch installed at the fac-
tory
TESTING
All the units are factory-tested and supplied complete with
oil and refrigerant.
CERTIFICATIONS AND REFERENCE
STANDARDS
The manufacturer has implemented and keeps the Man-
agement Systems listed below and it is certied against
them:
• Quality Management System according to standard UNI
EN ISO 9000;
• Environmental Management System according to stand-
ard UNI EN ISO 14000;
• Health and Safety Management System according to
standard BS OHSAS 18000 (as converted into UNI EN
ISO 45000).
These management systems ensure that the company
puts in place any and all actions and initiatives to dene
and monitor the standards dened by its Management,
which are stated in its Quality, Environmental and Safety
policies.
To meet the safety requirements, the unit was designed
and manufactured in compliance with the directives and
product regulations below:
• PED Directive: safety criteria to be followed when de-
signing pressure equipment. Units are PED-approved,
cat. IV;
• Machinery Directive: safety criteria to be followed when
designing machinery;
• Low Voltage Directive: safety criteria to be followed
when designing electrical machine parts;
• Electromagnetic Compatibility Directive: electromag-
netic compatibility criteria to be followed when design-
ing electrical machine parts;
• WEEE Directive: criteria for product management at the
end of its life cycle as waste with a view to environmen-
tal protection.
The units are manufactured, tested and checked with ref-
erence to the European standards specied in the Decla-
ration of CE Conformity, in accordance with the require-
ments and procedures of our Quality System.
Responsibilities and obligations exclusive to
the installer:
• to carry out a specic risk assessment according to the
European regulations/standards above and/or the local
laws in order to dene the necessary measures for con-
formity;
• to comply with the requirements and to take the meas-
ures resulting from the outcomes of the risk assess-
ment, pursuant to the relevant regulations and stand-
ards.

6
VERSIONS
Alongside the basic version of the unit, there are the fol-
lowing versions
OH: non-reversible heat pump
This is a heat pump for heating only. Compared to the ba-
sic version, both user-side and source-side heat exchang-
ers are insulated.
HPW: reversible heat pump on water side.
This reversible heat pump is suitable for applications in
which the user-side circuit and the source-side circuit can
be exchanged with each other. Therefore, the tter must
make provision for a system of valves that will allow ex-
change of the two hydraulic circuits. If the seasonal mode
change is carried out via remote signal or BMS, the unit
can control motor-driven reversing valves (not supplied)
so as to make this operation fully automatic.
Compared to the basic version, both user-side and source-
side heat exchangers are insulated.
OPTIONS
/LN: low noise version
The unit includes a soundproong compartment on the
compressor consisting of a rigid outer cowling made of
galvanised and painted sheet metal (RAL 7035), lined with
sound absorbing matting with high acoustic impedance
material in between.
/XLN: super low noise version
The unit includes:
• soundproong compartment on the compressor con-
sisting of a rigid outer cowling made of galvanised and
painted sheet metal (RAL 7035), lined with sound ab-
sorbing matting with high acoustic impedance material
in between.
• Cover jacket on the compressor made of: 50 mm
noise-absorbing material made with self-extinguish-
ing polyester bre on the compressor side - density
30 Kg/m³ -, soundproof rubber sheet - density 6 Kg/
m³ -, placed in-between the polyester layers, and an
additional layer of noise-absorbing material made with
self-extinguishing polyester bre on the sheath side -
density 30 kg/m³. Total thickness 70 mm
/DC: unit with total recovery condenser
In addition to the basic version, the following elements are
included in the chiller unit only:
• a recovery section of condensation heat (100%), fea-
tured inside the condenser;
• a temperature probe at the inlet of the heat recovery
heat exchanger
• potential free contact in the electrical control panel for
activation of heat recovery. When required by the sys-
tem, through the closing of a contact, the controller au-
tomatically manages activation of heat recovery. Heat
recovery management is carried out through a control
on the temperature of the return water. The controller
also automatically manages safety deactivation of heat
recovery, if the condensing pressure becomes too high,
and switches to using the source-side heat exchanger.

7
DESCRIPTION OF ACCESSORIES
Some accessories may be incompatible with each other even if not expressly indicated.
Refrigerant
R134 R134a
Unit supplied with refrigerant R134a instead of R513A.
Refrigerant circuit accessories
VM2 Condensation control with 2-way modulating valve
The accessory includes the supply of a 2-way modulating valve complete with servo control to be installed
on the source-side hydraulic circuit (installation by the customer). The servo control is controlled via a 0-10V
signal from the control depending on the condensing pressure.
This accessory is to be used in applications where it is benecial, when possible, to reduce the total ow rate
of water coming from the source (for example, when well water is used). When the unit reaches the setpoint,
the valve will be forced to close.
Accessory supplied loose.
VM3 Condensation control with 3-way modulating valve
The accessory includes the supply of a 3-way modulating valve complete with servo control to be installed
on the source-side hydraulic circuit (installation by the customer). The servo control is controlled via a 0-10V
signal from the control depending on the condensing pressure.
This accessory is to be used in applications where it is benecial, when possible, to reduce the ow rate of
water sent to the source-side heat exchanger (for example, when water from a loop is used). When the unit
reaches the set point, the valve will be forced to total recirculation.
Accessory supplied loose.
SCU Cumulative 0-10V signal for condensation control
This accessory requires a 0-10V output in the terminal board to carry out condensation control through a
device outside the machine (2-way valve, 3-way valve, inverter-controlled pump). The signal is linked to the
condensing pressure.
The signal is cumulative and therefore the accessory is suitable for combination on units in which there is a
single condensation control device located on the common branch of the source.
Incompatible with condensation control with modulating valve.
DVS Double safety valve
With this accessory, instead of each individual safety valve per circuit, there is a "candelabrum" with two safety
valves and a diverter valve for choosing the valve in operation. This allows the safety valves to be replaced
without having to drain the machine and without having to stop it.
MAFR Pressure gauges
The operating pressures of each circuit of the unit can be displayed on the control by accessing the relevant
screens. Also, the machine can be tted with pressure gauges (two for each circuit) installed in a clearly visible
position. These allow reading in real time of the working pressures of the refrigerant gas on the low pressure
side and on the high pressure side of each refrigerant circuit.
RUBA Compressor suction valves
The valves situated on the suction side of the compressors allow the compressor to be isolated from the rest
of the refrigerant circuit, so making the maintenance operations quicker and less invasive.
The compressor discharge valve is standard on all compressors
RPP Refrigerant leak detector with automatic pump down
This accessory includes a refrigerant leak detector. Detection of a refrigerant leak is managed by the controller
through a specic alarm and display of a specic icon on the display of the controller. For all the circuits of the
unit, the alarm also starts the machine stopping procedure with pump down, conning all the refrigerant in
the condenser.
Accessory as an alternative to Refrigerant leak detector.

8
BK Brine Kit
This accessory is compulsory if a water temperature set point lower than or equal to +3°C is used (if the unit
is provided with double set point or variable set point, the lower set point is considered).
The accessory consists of increased insulation and suitable sizing and calibration of some components.
The inlet and outlet temperatures of the user-side exchanger must be given on ordering to allow correct set-
ting of the alarm parameters and verication of the sizing of the expansion valve.
The cooling set point can then be changed by the customer in an interval that, compared to the set point given
on ordering, ranges from -1K up to the allowed limit temperature.
The unit will be optimized to work at the set point temperature given on ordering. For dierent set points, the
cooling capacity provided and the level of eciency of the machine could decrease and move away from these
conditions.
This accessory obligatorily requires insertion of one of the condensation control options.
RPR Refrigerant leak detector
This accessory includes a refrigerant leak detector. Detection of a refrigerant leak is managed by the controller
through a specic alarm and display of a specic icon on the display of the controller. This alarm stops the unit.
Accessory as an alternative to Refrigerant leak detector with automatic pump down.
Hydraulic circuit accessories
CFC Flanged hydraulic connections + counteranges
Depending on the version of the unit, anges and counteranges are supplied for:
• user side
• on the source side.
• recovery side
Accessory supplied loose.
FVF FLOWZER VFPP – Kit for variable ow rate primary circuit pump with bypass valve
included
Bluethink solution for a variable ow rate system, consisting solely of a user-side primary circuit.
Flowzer VFPP includes:
• a pressure transducer installed at the ends of the user-side exchanger (Δpe)
• a dedicated control system, installed at the factory in the electrical control panel of the unit (Sc)
• a modulating bypass valve with servo-motor supplied separately with it (Vbp), supplied loose (installation by
the customer)
• two system pressure transducers (Δpp) supplied separately (installation by the customer)
The components above and the pump inverter must be selected at the time of the pre-sale agreements, de-
pending on the features of the system. This has an impact on the quotation of the option and on the supply
terms of the concerned components.
In particular, the unit includes an additional control system, equipped with an advanced algorithm, which in-
teracts with the main advanced Bluethink controller.

9
Flowzer VFPP has the advantage of:
• implementing an innovative design, which is alternative to the classic system based on xed ow-rate pri-
mary circuit plus secondary circuit
• being ideal for new or entirely redesigned systems, especially for comfort applications
• achieving a complete variable ow system, with maximum energy saving
• simplifying the layout of the user circuit
• limiting the capex of the system
• achieving complete and reliable control of the system
The maximum energy saving is achieved thanks to:
• a hydraulic decoupler managed by the modulating bypass valve, which regulates the bypass ow rate on
the lowest possible value
• an advanced algorithm to prevent hunting by the reversing valve and by the bypass valve, thereby balanc-
ing the pump speed and the bypass speed to a minimum
The capex of the system is also reduced thanks to:
• small internal footprint, due to the simplied layout
The operating principle can be summarized as follows:
• Flowzer VFPP carries out constant control of the discharge head
• the system controller modulates the pump speed according to the condition detected by the system trans-
ducers Δpp
• if the system terminals are switched o, the pump speed will decrease
• the pump speed can be reduced until it reaches the minimum allowed ow rate on the heat exchanger of
the unit
• this ow rate is indirectly monitored through the losses detected by the dierential pressure transducer Δpe
• When the minimum allowed ow rate threshold is exceeded, the control system will open the bypass valve
Vbp to recirculate the ow rate that is not required by the system, but is necessary to guarantee the mini-
mum ow rate to the heat exchanger.
In the required minimum load condition (that is, with all system terminals switched o), the required minimum
volume (Vmin) must be concentrated in the relevant tank, to be installed between the unit and the bypass valve.
The bypass valve Vbp is controlled through a 0-10 V signal and must therefore be installed within 30 m of the
unit.
The pressure transducers of the system Δpp provide a 4-20 mA signal and require two 1/4" female ttings.
These transducers must be installed within 200 m of the unit, near the system terminal that is aected by
the highest line head losses or in any case in a position where it is possible to measure an adequate pressure
value.
Further details can be found in the relevant manual.
FVPS FLOWZER VPS – Kit for variable ow rate pump with temperature sensors
Bluethink solution for a variable ow rate system, consisting of a primary circuit plus secondary circuit.
Flowzer VPS includes:
• a dierential pressure transducer, installed at the factory at the ends of the user-side heat exchanger of the
unit (Δpe)
• a dedicated control system, installed at the factory in the electrical control panel of the unit (Sc)
• two system temperature sensors (T) - supplied separately; installation by the customer

10
The components above and the pump inverter must be selected at the time of the pre-sale agreements, de-
pending on the features of the system. This has an impact on the quotation of the option and on the supply
terms of the concerned components.
In particular, the unit includes an additional control system, equipped with an advanced algorithm, which in-
teracts with the main advanced Bluethink controller.
Flowzer VPS has the advantage of:
• being ideal for renovations of existing systems, especially for comfort applications
• achieving a complete variable ow system, with maximum energy saving
• implementing a exible design, e.g. for scalable or multi-zone systems
The maximum energy saving is achieved thanks to the advanced algorithm, which prevents hunting by the
inverter and balances the pump speed and the recirculation ow rate to a minimum.
With refurbishments, the system's capex is limited to the unit and its commissioning.
The dimensions of the inverter of the unit and of the pump module can be favoured by the low design dis-
charge head of the primary circuit.
The operating principle can be summarized as follows:
• Flowzer VPS performs intelligent control of the ow rate on the primary circuit, and balances it compared to
the ow diagram of the secondary circuit
• the system controller modulates the pump speed according to the condition detected by the system sensors
T
• if the system terminals are switched o, the ow rate of the secondary circuit will decrease; therefore the
direction of ow is detected indirectly as temperature dierence by the system sensors through the separa-
tor or the bypass pipe
• the system controller will consequently force the primary pump to reduce its speed, until it reaches the
minimum allowed ow rate on the heat exchanger of the unit
• this ow rate is indirectly monitored through the losses detected by the dierential pressure transducer Δpe
In the required minimum load condition (that is, with all system terminals switched o), the necessary mini-
mum volume (Vmin) must be ensured by the relevant tank to be installed between the unit and the decoupler
or bypass pipe.
The temperature sensors of the system T provide a 4-20 mA signal and require 1/2" female ttings.
Further details can be found in the relevant manual.

11
Electrical accessories
LIID Limitation of the current absorbed by digital input
When this accessory is requested, a digital input is prepared in the terminal board to activate the forced ca-
pacity reduction of the unit to a set xed level.
This accessory is useful when there is a need to necessarily limit the power absorbed by the unit as regards
particular conditions.
We point out that, in some conditions (for example, during hourly compressor rotation procedures), the con-
troller could force the unit to operate at full capacity for limited periods of time.
SETD Double set point from digital input
The accessory allows you to preset two dierent operating set points and manage the change from one to the
other through a digital signal.
The set point temperatures must be specied when ordering. For optimization of the unit, reference will be
made to the lower set point in chiller mode and the higher set point in heat pump mode.
Unless otherwise specied in the order, the controller will be set at the factory with the following temperatures:
• in chiller mode, set point 1 to 7°C and set point 2 to 12°C
• in heat pump mode (only for HPW and OH units) set point 1 at 45°C and set point 2 at 40°C
CSP Set point compensation depending on external air temperature
For units tted with this accessory, the set point of the unit is set so that it can vary between two values, a
maximum and a minimum, depending on the external air temperature. The compensation ramp and the max-
imum and minimum values of the set point can be changed by the user.
Unless otherwise specied in the order, the controller will be set to implement a positive compensation logic
according to the temperatures shown in the following diagrams:
Positive compensation Negative compensation
Chiller
Heat pump
SET POINT 2 17/12°C
SET POINT 1 12/7°C
25°C 35°C
SET POINT 2 17/12°C
SET POINT 1 12/7°C
25°C 35°C
SET POINT 2 40/45°C
SET POINT 1 35/40°C
0°C 15°C
SET POINT 2 40/45°C
SET POINT 1 35/40°C
0°C 15°C
External air temperature External air temperature
External air temperatureExternal air temperature
IA Automatic circuit breakers (instead of fuses)
This accessory requires the installation of automatic circuit breakers, instead of fuses, for the protection of
auxiliary loads. Also, the same accessory uses automatic circuit breakers with adjustable thermal overload
protection to protect the compressors.

12
SETV Variable set point with remote signal
The accessory allows the set point to be varied continuously between two preset values, a maximum and a
minimum, depending on an external signal that can be of the 0-1V, 0-10V or 4-20mA type.
The set point temperatures and the type of signal to use for the adjustment must be specied when ordering.
For optimization of the unit, reference will be made to the lower set point in chiller mode and the higher set
point in heat pump mode.
Unless otherwise specied in the order, the controller will be set at the factory with 0-10V analogue input and
with the following temperatures:
• in chiller mode, 0V will correspond to a set point of 7°C and 10V will correspond to a set point of 12°C
• in heat pump mode (only for HPW and OH units), 0V will correspond to a set point of 45°C and 10V will
correspond to a set point of 40°C
DAM Double power supply with manual switching
A manual switch to which to connect two separate power supply lines (for example, one from the mains power
line and one from the uninterruptible power supply unit) is installed in the electrical control panel of the unit.
The switching from one line to another is manual and obligatorily requires passing through the OFF position.
DAA Double power supply with automatic switching
A motor-driven automatic switch to which to connect two separate power supply lines (for example, one from
the mains power line and one from the uninterruptible power supply unit) is installed in the electrical control
panel of the unit.
The switching from one line to another is automatic and obligatorily requires passing through the OFF position.
When this accessory is requested, the power supply of the unit must compulsorily include neutral.
ENM Energy meter
The accessory allows the main electrical quantities (including voltage, current, power) to be read on the three
phases, via current transformer.
This accessory communicates with the BlueThink controller to supervise the monitored data. The values meas-
ured are then made available through the unit display and the web server.
ENML Energy meter with current limiter
The accessory allows the main electrical quantities (including voltage, current, power) to be read on the three
phases, via current transformer.
This accessory communicates with the BlueThink controller to supervise the monitored data. The values meas-
ured are then made available through the unit display and the web server.
This accessory is designed to limit the max. current the unit can absorb. The controller instantly checks the
absorption levels and, where necessary, it applies a forced capacity reduction that keeps the absorbed current
value below the stored threshold.
GFC FC/NG management
This option is available only for the basic model (chiller).
The option includes conguration of the BlueThink controller of the unit, in order to carry out the free-cooling
mode, without using glycol.
The option also includes integration in the machine of: free-cooling pump relay, consent for external dry cooler,
system return probe and dry-cooler inlet and outlet probes.
The components required for making the system, and also the hydraulic and electrical connections to the unit,
are to be provided by the customer.
More specically, the system will consist of:
• a water-water heat exchanger that carries out the separation between the source side (glycol) and the user
side (non-glycol).
• a 3-way modulating valve that feeds the free cooling circuit and carries out condensation control when the
unit is working in mixed chiller/free cooling mode.
• a source-side pump

13
R1PR Relay for management of 1 external heat recovery-side pump
This accessory can be requested for units without heat recovery pumps (for DC units) and allows a pump out-
side the machine to be controlled.
R2PR Relay for management of 2 external heat recovery-side pumps
This accessory can be requested for units without heat recovery pumps (for DC units) and allows two pumps
outside the machine to be controlled with a running/stand-by logic by implementing a rotation on the hours
of operation.
R1PU Relay for management of 1 external user-side pump
This accessory can be requested for units without user-side pumps and allows a pump outside the machine to
be controlled.
R2PU Relay for management of 2 external user-side pumps
This accessory can be requested for units without user-side pumps and allows two pumps outside the machine
to be controlled with a running/stand-by logic by implementing a rotation on the hours of operation.
RE1S Relay for management of 1 external source-side pump
This accessory can be requested for units without source-side pumps and allows a pump outside the machine
to be controlled.
RE2S Relay for management of 2 external source-side pumps
This accessory can be requested for units without source-side pumps and allows two pumps outside the ma-
chine to be controlled with a running/stand-by logic by implementing a rotation on the hours of operation.
RMMT Maximum and minimum voltage relay
This accessory constantly monitors the voltage value and the unit's power supply phase sequence. If the sup-
ply voltage does not fall within the set parameters or there is a phase reversal, an alarm is generated that
stops the machine to prevent damage to its main parts
FARE Fast Restart
The Fast Restart accessory enables the controller to carry out a fast restart of the unit following a blackout, in
order to reduce machine down times to a minimum.
This accessory requires the provision of a power supply line dedicated to the controller (uninterruptible power
supply unit installed by the customer) and a maximum and minimum voltage relay in the electrical control
panel. In this way, the controller of the unit will always remain powered even during a blackout.
Once the main power supply returns after a blackout, the starting of the rst compressor takes place within 60
seconds and the full capacity of the unit is reached in about 180 seconds (a time that depends on the number
of compressors and the instant load level).
In order to protect component service life, the controller may carry out the Fast Restart procedure no more
than 3 times in an hour and 5 times in one day.
Also, to make it easier to carry out any maintenance on the power supply line dedicated to the controller, there
is a selector switch inside the electrical control panel to allow the controller to be powered directly from the
main power supply of the machine.
Includes "Maximum and minimum voltage relay".
TERM Remote-controlled user terminal panel
This accessory allows the terminal normally situated on the machine to be replicated on a support situated at
a distance. It is particularly suitable when the unit is placed in an area that is not easily accessible.
The accessory is supplied loose and is to be installed by the customer at a maximum distance of 120m from
the unit. We advise using a cable of the following type: "TECO O.R. FE 2x2xAWG24 SN/ST/PUR".
For this accessory, there is a dedicated serial port.

14
Network accessories
BEET Blueye® via Ethernet
Blueye® is a supervision platform that enables remote monitoring of one or more units in the same system
interconnected through a network with Modbus protocol.
This accessory features the Blueye device, as already installed and wired in the unit.
The critical variables to be monitored over time are identied for each connected device. These variables are
sampled and saved to the cloud so that they are accessible at all times through a web portal or a mobile APP
(available for Android and iOS).
The following options can be selected for connection to the internet:
• a LAN (Ethernet) connection - available in the system;
• a connection to a mobile network - at least 3G. The data SIM card is not included.
Three dierent types of contracts can be signed.
Blueye® Cloud Basic:
• to monitor a max. of 20 variables in total over max. 5 units/peripherals;
• to set a min. sampling frequency of 60 seconds.
Blueye® Cloud Advanced:
• to monitor a max. of 200 variables in total over max. 10 units/peripherals;
• to set a min. sampling frequency of 5 seconds.
Blueye® Connect:
• To monitor up to 10 units/peripherals.
Subscribing to any of the Blueye® Cloud enables:
• viewing the history of the monitored variables, in the form of both numerical values and graphs;
• downloading the history of variables in CSV format;
• the creation of automatic reports;
• setting notications (via APP or mail) with settable thresholds for each variable;
• switching the unit ON/OFF remotely;;
• changing the set point remotely;
• selection of SUMMER/WINTER mode remotely (for reversible units only).
The subscription to the Blueye® Connect service oers the advantages below:
• a safe connection (tunnelling) between the user and the remote unit through the Blueye® portal;
• full access to the remote controller;
• real time monitoring;
• software upgrading.
Blueye® via Ethernet is only available for units supplied with an advanced controller and does not include
any type of service. This service must be purchased separately based on the number of units/devices to be
connected and the number of variables to be monitored. In order to connect multiple units to #b# Blueye®
device, the network switch is required (this accessory is sold separately).
Units can also be connected to the Blueye device through the RS485 network featuring a Modbus RTU protocol
(for this option, refer to BERS accessory).
For further details, refer to the specic Blueye® documentation.

15
PBA BACnet protocol over IP (Ethernet)
The controller is set for use, in read and write mode, of the BACnet port on IP protocol.
By default, the programming gives read-only access to the control of the unit. Enabling of read/write access
should be requested when ordering.
PSN SNMP protocol
The accessory consists of a gateway that allows Ethernet connection to a SNMP manager supervision system.
The use of this accessory causes the RS485 serial port to be unavailable.
GLO Modbus Lonworks Gateway
With this accessory, a RS485/Lon gateway is installed inside the electrical control panel.
By default, the programming gives read-only access to the control of the unit. Enabling of read/write access
should be requested when ordering.
SMAR Smartlink
This accessory makes it possible to connect the controller of the unit with the control-
ler of a Swegon GOLD™ air handling unit via a simple serial cable, so allowing their operat-
ing logics to be merged into a single consciousness that pursues the maximum energy eciency of the
system. The RS485 serial interface is already included and dedicated to connection with Swegon units.
The option is incompatible with:
• double set point
• variable set point with remote signa
• summer/winter selection by digital input
• set point compensation depending on external air temperature
• multilogic
• all communication protocols.
SW4P Network switch with 4 ports
The accessory includes installation in DIN rail of a professional 4-port network switch.Requires Blueye via
Ethernet.
SW8P Network switch with 8 ports
The accessory includes installation in DIN rail of a professional 8-port network switch.
Requires Blueye via Ethernet.
WIFI Wi-Fi
The accessory includes the supply of a Hot Spot WiFi already installed, wired and congured, complete with
antenna.This accessory requires the Ethernet port of the controller to be available or, alternatively, a network
switch with at least one available port to be present in the machine.

16
FMx Multilogic Function
The Multilogic function allows management of up to 32 units equipped with advanced Bluethink controller and
connected in hydraulic parallel with each other.
On the basis of the information recorded by the temperature probes installed on the delivery and return man-
ifolds of the system, with the master unit, a capacity request is generated that is distributed among the units
connected in the Multilogic network according to settable priority and optimization logics.
If communication between the units fails or if the master is o-line, the slave units can continue to work ac-
cording to the set thermoregulation parameters.
The connected units can be dierent from each other, in terms of capacity and set-up, provided the following
rules are complied with:
• if there are both chiller units and heat pumps in the Multilogic network, the Master unit must obligatorily be
one of the HP units
• if there are both free cooling and non free-cooling units in the Multilogic network, the Master unit must ob-
ligatorily be one of the free-cooling units.
The Multilogic function that can be requested with the unit can be:
• FM0: Multilogic function for Slave unit
• FM2: Multilogic function for Master unit for managing up to 2 Slaves
• FM6: Multilogic function for Master unit for managing up to 6 Slaves
If you need to connect more than 6 slaves (up to 31), you can ask for a quotation from our sales department.
For the slave units, the accessory requires:
• programming of the unit as slave of a system of machines in Multilogic network
For the master units, the accessory requires:
• programming of the unit as master of a system of machines in Multilogic network
• entering of the parameters necessary for connection with the individual slave units
• installation in the electrical control panel of a network switch to allow the units to be connected in a LAN
network.
• the supply of 2 temperature probes to be positioned on the delivery and return manifold of the system (sup-
plied separately with it, installation and wiring by the customer)
The connection between the master unit and the slave units made with a CAT cable. 5E/UTP (prepared by the
customer) with RJ45 connectors. Maximum cable length 100m.
For further details, please refer to the controller manual.

17
Other accessories
AG Rubber anti-vibration mounts
These allow you to reduce the vibrations transmitted from the unit to the surface it is standing on.
Accessory supplied loose.
AM Spring anti-vibration mounts
These allow you to reduce the vibrations transmitted from the unit to the surface it is standing on.
Accessory supplied loose.
FLUS Flow switch
As an alternative to the dierential pressure switch (standard ow sensor), it is possible to request the pad-
dle ow switch as accessory. This detects when there is no water ow to the user-side exchanger and sends
a signal to the control of the unit that will stop the compressors to prevent damage to the exchangers.The
ow switch is supplied loose (installation by the customer) and replaces the water dierential pressure switch
(standard).
GABB Packaging in wooden crate
The unit is protected by a made-to-measure wooden crate. The accessory is mandatory if shipping by contain-
er is required.
KFW Water lter kit
To protect the elements of the hydraulic circuit (in particular, the exchangers), there are Y lters that can stop
and settle the particles that are normally present in the water ow and would otherwise settle in the more
delicate parts of the hydraulic circuit and damage its heat exchange capacity.
The kit involves the supply of a lter for each exchanger present in the machine.
Installation of the water lter is mandatory even when it is not supplied as an accessory.
Accessory supplied loose.
Depending on the version of the unit, user side and source side lters are supplied, and for DC version units,
heat recovery side lters are also supplied.

18
SLCO Skid for shipping in container
The accessory provides for the installation of a wooden sled for loading and a xing system inside the container
by a strap.
If this accessory is requested, loading is only possible on containers and must be carried out at the factory.

19
TECHNICAL SPECIFICATIONS
OMEGA SKY Xi
25.1 29.1 35.1 40.1 47.1 53.1 60.1 72.1 81.1 97.1
R513A
Cooling
Refrigeration capacity (1) kW 252 304 361 404 459 525 590 718 810 940
Total absorbed power (1) kW 52 60 71 79 89 101 113 135 152 181
EER (1) 4,88 5,06 5,09 5,11 5,16 5,22 5,24 5,32 5,34 5,2
Eurovent eciency class (1) BAAAAAAAAA
ESEER (10) 7,04 7,24 7,41 7,51 7,6 7,69 7,71 7,66 7,65 7,05
User-side heat exchanger
Quantity n° 1111111111
Water ow rate (1) m³/h 43 52 62 69 79 90 102 124 139 162
Head loss (1) kPa 36 40 38 36 33 34 37 35 33 37
Source-side heat exchanger
Quantity n° 1111111111
Water ow rate (1) m³/h 52 62 74 83 94 107 120 146 165 192
Head loss (1) kPa 23 27 20 18 21 18 18 28 32 34
R134a
Cooling
Refrigeration capacity (1) kW 258 311 370 413 473 536 603 734 829 952
Total absorbed power (1) kW 51 60 70 78 88 101 112 134 151 179
EER (1) 5,02 5,22 5,25 5,29 5,35 5,33 5,37 5,48 5,5 5,32
Eurovent eciency class (1) BAAAAAAAAA
ISEER (8) 7,03 7,29 7,3 7,37 7,47 7,45 7,5 7,63 7,6 6,74
IPLV (9) 8,85 9,18 9,18 9,27 9,39 9,44 9,5 9,53 9,49 8,44
ESEER (10) 7,24 7,46 7,6 7,73 7,86 7,89 7,93 7,87 7,82 7,14
User-side heat exchanger
Quantity n° 1111111111
Water ow rate (1) m³/h 44 54 64 71 81 92 104 126 143 164
Head loss (1) kPa 39 42 40 38 35 36 39 37 35 37
Source-side heat exchanger
Quantity n° 1111111111
Water ow rate (1) m³/h 53 63 75 84 96 109 123 149 168 194
Head loss (1) kPa 25 28 21 19 22 19 19 30 34 34
Compressors
Compressors/Circuits n°/n° 1/1 1/1 1/1 1/1 1/1 1/1 1/1 1/1 1/1 1/1
Minimum capacity reduction step (3) %25% 25% 25% 25% 25% 25% 25% 25% 25% 25%
Refrigerant charge - R134a (6) kg 63 65 94 92 95 130 127 155 166 210
Refrigerant charge - R513A (6) kg 70 71 105 101 104 144 140 171 180 230
Noise levels
Sound power lev. (4) dB(A) 99 99 100 100 101 101 102 102 104 106
Sound pressure lev. (5) dB(A) 81 81 82 82 83 82 83 83 85 87
Sound power levels LN (4) dB(A) 94 94 95 95 96 96 97 97 99 101
Sound pressure levels LN (5) dB(A) 76 76 77 77 78 77 78 78 80 82
Sound power levels XLN (4) dB(A) 91 91 92 92 93 93 94 94 96 98
Sound pressure levels XLN (5) dB(A) 73 73 74 74 75 74 75 75 77 79
Dimensions and weights**
Length mm 3700 3700 3800 3800 3800 3900 3900 4100 4150 4250
Depth mm 1500 1500 1550 1550 1550 1550 1550 1670 1670 1850
Height mm 2050 2050 2100 2100 2100 2150 2150 2300 2400 2400
Operating weight kg 2215 2335 2694 2832 2987 3381 3509 4260 4742 5460
(1) Source-side heat exchanger inlet/outlet water temperature 30/35°C; user-side heat exchanger inlet/outlet water temperature 12/7°C. Values com-
pliant with standard EN 14511
(3) Approximate value. The minimum capacity reached by the unit depends on the operating conditions. The value shown may not be suitable for
calculating the minimum volume of water: to do this, consult the “Minimum water content in the system” section.
(4) Unit operating at nominal operating capacity, without any accessories, with source/side heat exchanger inlet/outlet water temperature 30/35°C
and user/side heat exchanger inlet/outlet water temperature 12/7°C.Binding values. Values obtained from measures taken according to standard
ISO 3744 and to the Eurovent certication programme where applicable.
(5) Values obtained from the sound power level (conditions: note 4), related to a distance of 1 m from the unit in free eld with directivity factor Q=2.
Non-binding values.
(6) Theoretical values referred to the basic unit (without DC). The amount of gas actually charged in the unit may dier.
(8) Reference to IS16590:2017, user-side heat exchanger outlet temperature 7 °C. Source-side heat exchanger inlet temperatures : part load 100 -
W39°C; part load 75 - W32°C; part load 50 - W26°C; part load 25 - W20°C.
(9) Reference to AHRI 550/590, user-side heat exchanger outlet temperature 6.7 °C. Source-side heat exchanger inlet temperatures : part load 100 -
W 35°C; part load 75 - W 26,7°C; part load 50 - W 18,3°C; part load 25 - W 12,8°C.
(10) Former Eurovent’s seasonal eciency index. Value not certied by Eurovent from 2019. Reference: base unit, without any accessories
** Basic unit without included accessories