Technical Specifications

Aquaflair™ Air-Cooled and Free-Cooling Chillers

Uniflair™ BREC, BREF
400V/3Ph/50Hz
400-1200kW
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AIR-COOLED WATER CHILLERS WITH AXIAL FANS
AIR-COOLED WATER CHILLERS WITH FREE-COOLING SYSTEM

Basic Version…………………………………………………………...……………………….…….... 1
Available Options…………………………………………………………………………………..…… 3
Main Components…………………………………………………………………............................. 5
Connection Logic for Uniflair Chillers………………………………………………………….. 10
Main Components – Details………………………………………………………............................. 12
General Technical Data............................................................................................................... 29
Technical Data: Nominal Conditions........................................................................................... 29
Technical Data: Correction Factors............................................................................................. 30
Nominal Technical Data.............................................................................................................. 31
Dimensions and Weights............................................................................................................. 33
Working Space............................................................................................................................ 34
Anti-Vibration Supports…………………………………………………………................................ 35
Refrigerant Content ……………………………………………………………...…………………..... 35
Hydraulic Circuit…………………………………………………………………................................ 36
Onboard Pump/s and Inverter Driven Pumps………………………………....…………………..... 39
Heat Exchangers Corrosion Resistance Table………………………………………………… 41
Pressure Drop............................................................................................................................ 42
Partial Heat Recovery................................................................................................................. 47
Operating Limits.......................................................................................................................... 48
Water Temperature: Precision on Set-Point................................................................................ 50
Noise Pressure Levels................................................................................................................ 51
Electrical Data.………………………………………………………………….…………………… 55

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BASIC VERSION

BREC – cooling only series

• Self-supporting galvanized sheet steel framework with panels painted with epoxy powder paints (colour RAL
9022)
• Two semi-hermetic double screw compressors with internal thermal protection, discharge shut-off valve, oil
heaters and anti-vibration supports.
• Two refrigerant circuits conforming to EC norms (PED 97/23/EC) in copper tubes including: filter dryer, flow
indicator, electronic expansion valve managed by the Uniflair™ control system, valve on the liquid line,
pressure switches, transducers and manometers of high and low pressure.
• High efficiency shell & tube single passage evaporator. The heat exchanger is insulated with UV-resistant
closed-cell expanded neoprene.
• Air side exchange coil with aluminum fins and internally grooved copper tubes.
• Water flow differential pressure switch.
• Acousti-Composite fans: Sickle-blade axial fans, statically and dynamically balanced, made from composite
materials for high efficiency and low acoustic impact, with safety protection grilles.
• Modulating condensation control with fan speed regulation.
• Electrical panel conforming to EC Norms (Directive 2006/95/EC and EMC 2004/108/EC, IP54) with general
cut-off switch, electric bars distribution for power supply, acquisition of absorbed current, maximum internal
temperature control, magneto-thermal cut-off switch on the fans and auxiliaries, fuses for the compressors.
• Sequence phase, minimum and maximum power supply monitoring
• Microprocessor control system UPC1m including:
- local user terminal with external accessibility
- outlet chilled water temperature regulation by means of an exclusive PID algorithm
- electronic expansion valve managed by the control system
- advanced control of cooling capacity by automatic set-point sensitivity regulation
- refrigerant charge monitoring
- monitoring of the absorbed current and checking of eventual malfunctions
- advanced anti-freeze protection on evaporator
- integrated LAN card for local network connection of a group of chillers
- integrated clock card
- rotation of pump group setting functioning and start of pump in stand-by in the event of pump breakdown
• Microprocessor control system in addition allows:
- management of double set-point from remote control
- limiting of absorbed current on pre-set value or external signal
- “Quick Start” procedure to reach total cooling capacity within 3 minutes.
- free-contact for general alarm and 2 for addressable alarms
- remote ON-OFF switch
- ability to interface with Modbus protocol directly on RS485 serial card
- ability to interface with main external communication protocols: Bacnet, Lonworks, Trend Metasys,
TCP/IP and SNMP.

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BREF – free-cooling series

• Exclusive Uniflair free-cooling system completely managed by the microprocessor control.

• Self-supporting frame in galvanized steel with panels finished in epoxy powders (colour RAL9022).
• Two semi-hermetic double screw compressors with internal thermal protection, discharge shut-off valve, oil
heaters and anti-vibration supports.
• Two refrigerant circuits conforming to EC norms (PED 97/23/EC) in copper tubes including: filter dryer, flow
indicator, electronic expansion valve managed by the control system, electrovalve on the liquid line, pressure
switches, transducers and manometers of high and low pressure.
• Possibility of operation with external temperatures as low as -25°C.
• High efficiency shell & tube single passage evaporator. The heat exchanger is insulated with UV-resistant
closed-cell expanded neoprene.
• Air side exchange coil with aluminium fins and internally grooved copper tubes.
• Water flow differential pressure switch.
• Acousti-composite fans: Sickle-blade axial fans, statically and dynamically balanced, made from composite
materials for high efficiency and low acoustic impact, with safety protection grilles.
• Modulating condensation control with fan speed regulation.
• Electrical panel conforming to EC Norms (Directive 2006/95/EC and EMC 2004/108/EC, IP54) with general
cut-off switch, power supply electric bars distribution, acquisition of absorbed current, minimum and
maximum internal temperature control, magneto-thermal cut-off switch on the fans and auxiliaries, fuses for
the compressors.
• Sequence phase, minimum and maximum power supply monitoring
• Free-cooling pump regulated by microprocessor control.
• Microprocessor control system UPC1m including:
- local user terminal with external accessibility
- outlet chilled water temperature regulation by means of an exclusive PID algorithm
- electronic expansion valve managed by the control system
- advanced control of cooling capacity by automatic set-point sensitivity regulation
- refrigerant charge monitoring
- monitoring of the absorbed current and checking of eventual malfunctions
- advanced anti-freeze protection on evaporator
- integrated LAN card for local network connection of a group of chillers
- integrated clock card
- rotation of pump group setting functioning and start of pump in stand-by in the event of pump breakdown.
• Microprocessor control system in addition allows:
- remote ON-OFF switch
- management of double set-point from remote control
- limiting of absorbed current on pre-set value or external signal
- “Quick Start” procedure to reach total cooling capacity within 3 minutes.
- free-contact for general alarm and 2 for addressable alarms
- ability to interface with Modbus protocol directly on RS485 serial card.
- ability to interface with main external communication protocols: Bacnet, Lonworks, Trend, Metasys,
TCP/IP and SNMP.

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AVAILABLE OPTIONS
BREC

Power supply
Single power supply
Double power supply
Control
UPC1m with LUT mP20II
UPC1m with touch screen LUT
Version
Low noise
Ultra low noise
Fans
Acousti-Composite fans with asynchronous motor
Acousti-Composite fans with EC motor
Options
Low external temperature
High external temperature
Heat recovery
Partial condensation heat recovery
Pump group
Without pump/s
1 pump
2 pumps
Anti-freeze heaters
Evaporator
Evaporator and 1 pump group
Evaporator and 2 pumps group
Compressor options
Suction shut-off valves
Economizer
Protection
Coils' metal grilles and filters
Coils' manifolds protection panel
Options
Unit connected in LAN
Low temperature water production
Power phase capacitors
Packing
Standard packing
Packing for container transport
Accessories supplied separately
Remote user terminal
0-10V signal Set-point compensation kit
RS485 card
LON FTT10 card
TCP/IP card
Spring anti-vibration supports
Flanged connections
Victaulic pipe joints kit
Lifting kit
Remote water sensor

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BREF

Power supply
Single power supply
Double power supply
Control
UPC1m with LUT mP20II
UPC1m with touch screen LUT
Version
Low noise
Ultra low noise
Fans
Acousti-Composite fans with asynchronous motor
Acousti-Composite fans with EC motor
Options
High external temperature
Intelligent free-cooling
Heat recovery
Partial condensation heat recovery
Pump group
Without pump/s
1 pump
2 pumps
Compressor options
Suction shut-off valves
Economizer
Protection
Coils' metal grilles and filters
Coils' manifolds protection panel
Options
Unit connected in LAN
Low temperature water production
Power phase capacitors
Packing
Standard packing
Packing for container transport
Accessories supplied separately
Remote user terminal
0-10V signal Set-point compensation kit
RS485 card
LON FTT10 card
TCP/IP card
Spring anti-vibration supports
Flanged connections
Victaulic pipe joints kit
Lifting kit
Remote water sensor

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NOTES FOR THE SELECTION

• All the configuration items must be completed.

• All the versions are equipped with modulating condensation control as standard, but in order to operate with
external temperatures lower than 0°C, it is necessary to fit the units with crankcase heaters for the
compressors and an anti-condensation heater for the electrical board. These devices are in the “Low
ambient temperature” option
• The models 1602A – 1802A – 2202A – 2502A – 2802A can operate with external temperatures up to 50°C
without additional accessories, therefore the option “High ambient temperature” is already included in the
basic version.

MAIN COMPONENTS

BREC/F units are designed and built to guarantee the production of chilled water 24 hours a day, all year round,
with the highest levels of safety and reliability.

For this reason, only the best components are used in its construction and Uniflair constantly strives to improve
the products offered to its clients in terms of:
• reliability
• ease of installation and maintenance
• quiet operation
• compactness
• resistance to corrosion
• energy efficiency
• operating precision

Frame

In order to ensure resistance to external environmental corrosion, the structure and panels of the casing are
produced entirely in galvanized steel (RAL 7037 colour). The paint conforms to ASTM B117 standard regarding
resistance to saline humidity; therefore the units can be installed in even the most testing of atmospheric
conditions. All external fastenings are in stainless steel. The closing mechanism on the casing gives IP54
protection.

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 Refrigerant

As Uniflair is and always has been, an environmentally conscious company, these units have been designed for
use with the ecological refrigerant R134a. “Ecological" in that it does not harm the ozone layer and contributes
less to global warming (The TEWI* index value is very low, 10% less than R407C).

*TEWI (Total Equivalent Warming Impact): parameter relating to the emission of refrigerant during the unit life-cycle, and the indirect emissions
of CO2 for energy production

Main refrigerant components

The units are equipped with two cooling circuits conforming to EC Directive (PED 97/23/EC) including:
• dehydration filter
• liquid sight glass
• electronic expansion valve managed by the control system
• solenoid valve on the liquid line
• high and low pressure pressure switch
• high and low pressure transducer
• high and low pressure manometer

Compressors

The units are equipped with two double screw compact compressors. These compressors are supplied by the
market's leading manufacturers. They are supplied with a temperature sensor fitted in the over-current protection
windings, a non-return valve on the delivery line both for preventing screw reverse rotation and to allow
equalisation of the pressure values inside the compressor for pressure free starting. Both compressors have partial
heat recovery in four steps (0 – 25 – 50 – 75 – 100%) and, therefore, the temperature of discharged water is
controlled in 8 steps:

0% 13% 25% 38% 50% 63% 75% 88% 100%

This ensures high EER values at part loads. To attenuate the transmission of vibrations, and therefore reduce
noise levels and possible faults, each compressor is fitted on rubber antivibration supports.

Water side heat exchanger

The evaporator fitted in BREC/F units is a high efficiency shell & tube single passage evaporator.

This type of “single passage” evaporator allows for:

• maintaining the flow of water horizontally, guaranteeing a uniform temperature of the volume of water even in
partial load conditions or when one of the circuits is not operating
• the flow of refrigerant to be straight, facilitating the drag of oil inside the tubes
• the thermal exchange to always occur “against the current” so ensuring maximum possible efficiency

The heat exchanger is insulated with UV-resistant closed-cell expanded neoprene.

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Air side heat exchanger

The condenser (evaporator) is generously proportioned in order to function at high ambient temperatures. It is
made from a coil equipped with aluminium fins and mechanically expanded copper tubing in order to obtain
optimum metallic contact for maximum exchange efficiency.

Electrical panel

Placed in appropriate areas, conforming to EC Directives (2006/95/EC & EMC

2004/108/EC) with:
• IP54 protection grade
• Lockable general cut-off switch
• Electric bars distribution
• Acquisition of the absorbed current
• Phase sequence control, minimum and maximum power supply
• Maximum internal temperature control
• Anti-condensation resistance (for low ambient temperature option)
• Thermo-magnetic protection for the fans and auxiliaries, fused on the
compressors
• Remote control switches for the compressors
• Auxiliary transformer at 24V and 230V
• Motor protector for the pump/s and the free-cooling pump (BREF)

Electrical panel: double electrical supply (Optional)

With the aim of guaranteeing a redundancy even in terms of electrical supply the BREC/F can be provided with the
option of double power supply with automatic commutation. The unit, equipped with double port isolator and
control room, can be connected to two separate electric lines, generally with one connected to a principal line and
the other to a generator or emergency line.

In case the principal line is not defined, the unit autonomously switches over to the other, at the same time
verifying an eventual return of supply. When the principal line becomes available again the supply is restored to
this line. Thanks to the fact that this solution allows both definition of the priority line and the frequency of
checking, the units equipped with double power supply guarantee absolute continuity of service. Activating the
“Quick Start” procedure (see Control section) the problems resulting from a lack of power supply can be resolved
in less than three minutes.

Electrical panel: separate power supply for control and auxiliaries (Optional)

With the aim of guaranteeing a continuous power supply for the control & the protection devices from an external
UPS.
Microprocessor control - UpCO1m control

The UpCO1m control system consists of two sections:

• a Control Board which consists of one (UPC1m) I/O board containing the regulation software and which is fitted
in the unit.
• a User Terminal which consists of a user interface and which can be installed locally or remotely.

The control system uses specifically designed sophisticated algorithms in order to control the outlet water
temperature within a minimal range and to monitor and protect the various unit components. The user interface
provides clear information on the unit status and any current alarms.

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Control card

This new advanced control is designed to be highly flexible and can be easily adapted for use with both comfort
and technological applications, allowing the management of partialization steps. The control system regulation
programme can be found in the FLASH-EPROM on the main board. The programming of the control parameters
(set points, differentials, alarm thresholds) and the displaying of data and events (set point readings, monitored
values, function events and alarms) is carried out using the User Terminal. The UPC1m control card uses a 16-bit
microprocessor and up to 2Mbyte flash memory, ensuring high performance in terms of processing speed and
memory space.

Features:
• 14MHz, 16bit microprocessor, 16bit internal registers and operations, 512 byte internal RAM
• FLASH MEMORY up to 2Mbyte for the program
• 128Kbyte static RAM
• RS485 serial connector for LAN (LAN card)
• 24Vac/Vdc power supply
• Telephone connector for user terminals
• Power indication LED

Main functions

The principal control functions are:

• Regulation
- Chilled water outlet temperature regulation by means of an exclusive PID algorithm
- Modulating condensation pressure control
- Management of the electronic thermostatic valve
- Advanced control of the cooling capacity by means of the self-adjusting set-point sensitivity regulation
- Double set-point with contact selection
- Set-point compensation based on the external temperature (settable)
- Intelligent free-cooling management (BREF)
- Rapid “Quick Start” procedure to reach total cooling capacity within 3 minutes
- Unloading to protect unit operation even with temperatures which exceed the maximum
• Operation
- Remote ON-OFF control
- Limiting of absorbed current on the pre-set value or external signal
- Partial heat recovery management with rotation of pump group on a time basis for equal operation and
start of the pump in stand-by in the event of malfunction
- High/low pressure transducer
- Integrated clock card
- Advanced anti-freeze protection on evaporator
- Integrated LAN card for local network connection of a group of chillers
- Compatibility with BMS via Modbus protocol with RS485 serial card
- Compatible with the main external BMS: LONworks, BacNET, TCP/IP, Trent
- Inter-connected management of more than one chiller (up to 10)
• Safety / alarms
- Refrigerant charge monitoring
- Monitoring of the absorbed current and checking of eventual malfunctions.
- Emergency function to ensure continuity of service even in the event of sensor or transducer breakdown.
- Management of anti-freeze resistance and minimum temperature of the electric board
- Advanced anti-freeze protection on the evaporator
- Alarm events history (relating to date and time of event)
- General alarm contact (addressable)
- Addressable alarm contacts (2 in total)
- Compressor function analysis
- Compressor rotation (FIFO logic)
- Compressor operation hours run
- Programmed maintenance threshold signalling

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Local user terminal (mP20II)

The local user terminal comes supplied with the standard unit and allows the control parameters to be
programmed (set points, differentials, alarm thresholds) and data and events to be displayed (set point readings,
monitored values, function events and alarms).

Remote user terminal (mP20II)

It is possible for the unit to be supplied with a remote control which enables commands to be entered directly to
the chiller; this can be positioned up to 200metres away (with a shielded cable). With this accessory, the exact
same operations are possible as with the local terminal. A wall fixing kit is available for remote fitting.

Protection accessories

The units can be supplied with the following optional protection accessories:
• Condensers or free-cooling coil filters and protection grilles: although naturally protected by the “V”
formation, the air side exchangers can be protected by means of metal filters provided with grilles.
• Coil manifold protection panels: protection panels are available for the piping connections to the condensers
(see below)

Anti-vibration supports

Spring anti-vibration supports are available as an option to insulate the unit from the support slab.

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CONNECTION LOGIC FOR UNIFLAIR CHILLERS

Uniflair water chillers equipped with advanced control board (UpCO1m) have the Local Area Network card (LAN)
integrated on the mainboard.

Therefore these units can be connected together in order to adapt the logic to the site requirements.
Generally the units are installed in parallel on the hydraulic side and on the control logic point of view, the
available operating modes are:

A. Singular
B. Interlaced
C. Cascade

All of the units use an algorithm to control the temperature of the chilled water based on the discharge
temperature of the water. Moreover, the algorithm uses the inlet water temperature to minimize the compressor
start-ups; in fact, a P.I.D. algorithm controls the discharge temperature of the water proportionally, but also uses
an integrated and derivative process on the inlet water temperature to minimize the compressor start-ups.

In this way, the UNIFLAIR control system can be considered an evolution compared to the traditional systems of
control which operate “predictably” on the discharge water temperature.
The outlet water temperature value can be taken onboard the chiller (on the discharge side of the evaporator) or,
with the optional remote water sensor, along another point for the plan.

Connection logic mode “A”

It permits to the unit to operate in autonomous way, without considering the other units. With this option the LAN
signal permits the rotation only in case of failure or time-based rotation.

Connection logic mode “B”

Two or more chillers setted in interlaced mode operate as a single unit.
They acquire the outlet water temperature value introducing with a small gap (offset) between themselves in order
to be avoid simultaneous switching on.
The offset is calculated using the LAN address and other parameters.

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Considering two units, both operating and fitted with two screw
compressor each, the control logic will be the following:
• Unit 1, compressor 1, step 1
• Unit 1, compressor 1, step 2
• Unit 2, compressor 1, step 1
• Unit 2, compressor 1, step 2
• Unit 1, compressor 2, step 1
• Unit 2, compressor 2, step 1
• Unit 1, compressor 2, step 2
• Unit 2, compressor 2, step 2
• Unit 1, compressor 1, step 3
• Unit 2, compressor 1, step 3
• Unit 1, compressor 2, step 3
• Unit 2, compressor 2, step 3
• Unit 1, compressor 1, step 4
• Unit 2, compressor 1, step 4
• Unit 1, compressor 2, step 4
• Unit 2, compressor 2, step 4

Connection logic mode “C”

Two or more chillers disposed in cascade mode operate as two chillers in sequence.
They acquire the outlet water temperatures and operate with the average value calculated with a small gap
(offset) calculated using the LAN address and other parameters in order to be avoid simultaneous switching on.

Considering two units, both operating and fitted with two screw compressor each, the control logic will be the
following:

• Unit 1, compressor 1, step 1

• Unit 1, compressor 1, step 2
• Unit 1, compressor 2, step 1
• Unit 1, compressor 2, step 2
• Unit 1, compressor 1, step 3
• Unit 1, compressor 2, step 3
• Unit 1, compressor 1, step 4
• Unit 1, compressor 2, step 4
• Unit 2, compressor 1, step 1
• Unit 2, compressor 1, step 2
• Unit 2, compressor 2, step 1
• Unit 2, compressor 2, step 2
• Unit 2, compressor 1, step 3
• Unit 2, compressor 2, step 3
• Unit 2, compressor 1, step 4
• Unit 2, compressor 2, step 4

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MAIN COMPONENTS – DETAILS
R134a ENVIRONMENTALLY-FRIENDLY REFRIGERANT

The majority of synthetic refrigerants contribute towards the increase in global warming, the refrigerant R134a
however, allows for operation with extremely low values according to the GWP and TEWI parameters concerning
environmental impact. The refrigerant R134a however, thanks to its thermodynamic properties and the fact it is a
mono-component refrigerant, is characterized by intrinsically high efficiency due to the complete absence of glide
and therefore subsequent energy losses during the change of state phases.

Parameters have been established to determine the environmental impact of different kinds of refrigerant:
• O.D.P. (Ozone Depletion Potential): can register a value between 0 and 1 (CFC-R12 = 1)
• G.W.P. (Global Warming Potential): the relationship between the overall warming caused by a particular
substance and the one caused by CO2 carbon dioxide.
• T.E.W.I. (Total Equivalent Warming Impact): parameter relating to the emission of refrigerant during the unit
life-cycle, and the indirect emissions of CO2 for energy production

It is, in fact, important to assess the environmental impact of a given substance, not only intrinsically, that
is, considering its chemical-physical features only, but also its application and effects during the entire
duration of use. In cooling devices, most of the contribution to the greenhouse effect (approximately 90%, if
not more) is caused by energy consumption, or rather, in indirect terms to the amount of CO2 produced by
power plants for supplying the energy necessary for operating the device.

It is thus essential to consider the energy consumption of a unit, and its ability to guarantee and maintain
high energy efficiency during the entire product life-cycle. The T.E.W.I. index considers both the direct
impact a substance has on the greenhouse effect, and its indirect contribution in terms of CO2 equivalent.

It takes the following points into account:

- refrigerant losses
- energy efficiency
- refrigerant recycling

Consequently, from the point of view of energy efficiency, the kWh consumed by the unit must be
calculated and converted into the CO2 produced. The higher the unit C.O.P. (or E.E.R.), the lower the
environmental impact at the same cooling performance.

This is the addition of the most significant T.E.W.I. when dealing with cooling equipment, which takes into
account the indirect contribution to the greenhouse effect. This component of the T.E.W.I. varies from
country to country as the kWh –> CO2 conversion coefficient depends on the power plants considered and
the amount of fossil fuel they use.

Refrigerant losses must obviously be kept to a minimum and unit energy efficiency maintained. In the case
of non-azeotropic refrigerants, loss of part of the fluid leads to the complete recharging of the cooling
circuit, and it will not necessarily maintain the declared efficiency.

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 T.E.W.I. = m × L × n × G.W.P. + β × E × n + m × (1-α) × G.W.P.
refrigerant losses unit efficiency recycle
unit related factors maintenance related factors

Key:
- m: refrigerant charge in kg
- L: % annual loss of refrigerant
- n: product lifespan in years
- GWP: global warming potential in kgCO2/ kg
- β: emission of CO2 in the power plant for each kWh produced
- E: annual energy consumed in kWh/ year
- α: refrigerant recovery factor at end of life
- (α =0.....no recovery; α=1......total recovery)

REFRIGERANT TYPE O.D.P. G.W.P. T.E.W.I.(*)

R22 HCFC 0,05 1700 1968

R134 HFC 0 1300 1821

R407C HFC 0 1600 2032

(*) per year, specific (each kW, each year), with assumed total refrigerant recovery factor at end of life (α=1)

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THE COMPACT SCREW COMPRESSOR: A BRIEF DESCRIPTION
The productivity of a chiller, precision air conditioning unit or heat pump greatly depends on its dynamic
behaviour. In particular, when there are great load variations, an elevated quality of regulation with small step
power control is necessary. Compact screw compressors offer the best characteristics for these needs. Unlike
compressors for large refrigerant systems equipped with externally positioned oil separators (and in some cases,
even oil-coolers), compact screw compressors are equipped with an integrated, three stage oil separator with
relative oil management system. This design has proved to be particularly advantageous when employed in
conditions which don’t exceed average pressure values, such as in the case of liquid coolers.

Basic construction design characteristics

• Screw profile: double rotor solution (5:6 profile ratio)

• Semi-airtight constructive design, cooled with intake gas
• Double wall rotor chassis with pressure compensation: guarantees increased strength and prevents, even in
conditions of high pressure, rotor chassis deformation which can reduce efficiency. Moreover, the double
wall design allows for further noise reduction.
• Long lasting rolling-contact bearings with pressure reduction. This not only reduces stress on the rolling-
contact bearings, but it also provokes a degassing process of the bearing chamber (almost reaching intake
pressure levels) which is situated on the high pressure side, and, at the same time, provokes a significant
increase in oil viscosity.

Power regulation with the sliding valve

Unlike other construction designs where the slide valve is introduced into a cylinder which is positioned parallel
to the rotor chassis, the slide valve is in direct contact with the screw profile which clearly provides higher-
efficiency levels in full or partial load conditions. This is achieved by adapting the slide valve’s shape to the rotor
profiles which do not have fissures, interspaces or by-pass apertures which reduce the efficiency. The slide valve
is hydraulically shifted along the axis to regulate the power. The motion of the slide valve is controlled by the
equilibrium of the involved pressure forces which act upon it. On the left hand side of the slide valve the intake
pressure rules, on the right, high pressure.

The pressure in the cylinder (see right hand side of diagram) establishes whether the piston runs left (in the
direction of maximum power), runs right (partial load) or remains in the same position. If the pressure is reduced
to the intake value by one of the CR1, CR2 or CR3 valves, the slide valve is moved in the direction of partial
load. If it occurs by means of the CR4, highly pressurised oil is introduced into the cylinder and there is a
movement towards full load. If the cylinder volume is unaltered, the slide valve position is maintained. Through
the control of the valves CR1….CR4, power control occurs in a small step mode (100-75-50-25%). The purpose
of the integrated spring is to bring the slide valve to a position of minimum power when the compressor is turned
off (pressure balance – CR3 open). In this way, baseload start up is guaranteed.

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THE ELECTRONIC EXPANSION VALVE
This valve offers important advantages both for air conditioning units and water cooled chillers which are to be
used for process applications and cooling systems. An electronic expansion valve consists of two main parts: the
valve itself and the step by step motor. The motor is situated in the upper part of the valve and is connected
directly to the body of the valve. The body of the valve, including the valve and the motor, is hermetic and welded
in order to eliminate the risk of refrigerant leaks. As is the case for the compressors, the valve motor is in contact
with the refrigerant and the lubricating oil, the materials for both devices are also substantially the same.

Operating system

Step by step motor

The electronic expansion valve is equipped with a bipolar, 2-phase motor which has the operating characteristics
typical of any step by step motor. It is kept in position until the pulses of current from the driver command it to
rotate in one of the two directions. Each impulse commands the rotation of the rotor for one step, and it is rotated
for a set degree, while a series of pulses produce continuous rotation of the rotor. The number of steps or levels
is extremely high in order to offer a wide and refined regulation field. A mechanical device transforms the
rotation movement of the shaft in a linear movement which enables the running of the regulation element of the
valve.

The valve
The valve is designed to control the flow of refrigerant which has linear characteristics, in such a way as to allow
a wide range of variation in capacity with a linear relationship between the flow and the position of the valve
itself. The refrigerant inlet and outlet and the regulation element are made of materials which ensure operating
precision over the years as well as an extended operating life.

Electronic expansion valve operation

Ordinary thermostatic expansion valves are self-activating, that is, they are activated by the pressure under
which they are subjected to with the help of an internal retaining spring. Instead, electronic expansion valves are
not self-activating and the step by step motor requires external elements and functions in order to be able to
carry out its own action. Two things are essentially necessary: an external driver and an algorithm which
establishes the operation of the valve itself.

The Driver
The driver is an electronic control unit which controls the position of the valve by means of digital pulses which
open and close the electric contacts in a determined sequence to control the movement of the step by step
motor in a clockwise and anti-clockwise direction. The algorithm is written in a determined language to control
the operation of the valve according to variations in the parameters and/or variations within the system.
The electronic expansion valve modulates the mass flow of refrigerant into the evaporator according to the
sensor signals, the control algorithm and the drivers. The characteristics of the electronic expansion valve enable
the integration of additional functions in the refrigerant cycle, like the interception of the refrigerant, the regulation
of the suction pressure and the control of the refrigerant load.

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 Flow

Completely closed Completely open

The drivers are devices which control the opening of the electronic expansion valves according to the
superheating required. Therefore, as long as the compressor is not activated, there is no passage of refrigerant
through the valve. When there is a request for cooling, and the compressor is activated, the drivers are informed
of the action which is taking place and this can happen in two ways: by means of a digital input (stand alone) or
by means of a signal from the microprocessor which manages the system. When the information reaches the
driver, it starts to control the mass flow of refrigerant, positioning the electronic expansion valve in the operating
conditions required according to the operation of the system.

Usually a stand-alone driver is made up as follows:

• hardware which controls the direction of the step by step motor according to the input signal
• algorithm to obtain correct performance of the system depending on the various conditions.
• parameters which allow the “plug & play” operation in different systems
• Alarms output

The Uniflair Control system is connected to the driver of the expansion valve which therefore, in addition
to standard functions, allows the acquisition of operating and alarm signals in order to ensure complete
control of the refrigerant circuit.

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PREDICTIVE MAINTENANCE
Predictive maintenance, also known as PdM, is the technique used to determine the correct equipment
performance during operation.Evaluating the correctness, or otherwise, using this technique, one can predict if
and when a possible maintenance intervention may be required.

PdM solutions allow for the evaluation of the real operating conditions by means of continuous monitoring of the
operating conditions of the elements which make up the equipment. This approach offers a tangible benefit,
maintaining the performance unaltered over time, increasing reliability, rendering the ordinary maintenance
operation more effective and reducing the possible downtime of the unit.

The components and algorithms which make up the predictive maintenance are based on the direct acquisition of
all the operational parameters of the unit, on comparison with the optimum operating conditions, the default of
each component and on the evaluation of the future performance of the equipment.

In this way, it is possible to:

• recognize each operational parameter, to identify possible anomalies.
• make each component operate within its own functional parameters
• intervene preventatively for maintenance interventions
• intervene correctly for operations of extraordinary maintenance.

The Uniflair Control software checks the complete operative state of the chiller, not only registering malfunctions
or abnormal conditions, but assuming the necessity/type of service requested. In particular, indirect monitoring of
the refrigerant load can quickly signal an alarm avoiding any significant loss.

Refrigerant leak detection

In conjunction with the electronic expansion valve and associated sensors, the system continually checks a whole
series of operating parameters including condensing and evaporating pressures, superheat and sub-cooling
values, as well as the current absorbed, which between them, when evaluated by the Uniflair Control software,
give an indirect indication of the refrigerant charge.

Management of the external temperature

The BREC/F units are equipped with modulating condensation control, therefore, influence of the external
temperature variations on the condensation pressures are managed by varying the speed of the ventilating
section and the cooling capacity of the unit (unloading).The Uniflair Control software monitors the operational
parameters allowing for discrimination between the situation in which the increase in condensation pressure is
caused by the external temperature or by other causes.In this way, interventions can be limited for high pressure
alarms only in the event of a real problem, by a preventative alert.

Advanced antifreeze protection for the evaporator

One of the most critical factors for a chiller is the possible formation of ice inside the evaporator. In fact, if the
installation does not use an antifreeze mixture, ice can form even if the registered temperature of the water
maintains a value above zero, with disastrous consequences for the exchanger and consequently for the
installation. In order to avoid this happening it is necessary to evaluate the refrigerating group as a whole.

The advanced antifreeze function serves to understand if there is or isn’t the formation of ice inside the
evaporator, using this technique, and therefore the pressures, the current temperatures and not least the ideal
cooling capacities are registered, compared and checked. As soon as ice starts forming the direct consequences
on these parameters quickly manifests the phenomenon, presenting the possibility to intervene before any actual
damage occurs.

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ACOUSTI-COMPOSITE FANS
BREC/F units are equipped with new generation axial fans made from a composite material: aluminium and
reinforced plastic material. This solution creates significant advantages in terms of efficiency, reliability and
acoustic impact.

Efficiency
These fans feature a “heart” made from aluminium and blades made of plastic. This allows better heat
dissipation compared to fans made only from polyurethane. The currents involved are lower thanks to the
reduction in weight which leads to lower inertia.

Reliability
The fact that these fans are coupled with a motor by means of a metallic cross section means that there is
improved resistance compared to fans made only from polyurethane and a reduction in weight compared to
those made completely from metal.

Acoustic impact
Acoustic impact and efficiency are closely linked to the “cleaning” of the air flow through the fans.
The use of fans made from plastic allows forms, and consequently performance, to be achieved which are not
possible with aluminium fans, resulting in an improved air flow.

Sustainability – reduced use of resources

The use of a critical raw material such as aluminium is limited to only the internal section of these fans.

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ACOUSTI-COMPOSITE FANS WITH ELECTRONICALLY COMMUTATED MOTOR (EC)

The electronically commutated (EC) electric motor is a motor synchronized by permanent electronically
commutated magnets.

The units with an EC electric motor guarantee:

• High reliability: the commutation is made by a power transistor, therefore there are no mechanical
elements present such as a collector or brushes which limit the working life. In EC motors the magnetic
field is generated by the same rotor thanks to the presence of permanent magnets. The commutation of
the magnetic field is electronic and consequently free of wear and tear resulting from contact between
static and rotating parts.
• High efficiency: The operating mode and materials used result in an increased efficiency which can be
demonstrated by less absorption with the same performance.
• Lower in-rush current thanks to “Soft Start” start-up due to the absence of mechanical elements.
• Low noise impact, particularly during regulation. In general, the speed regulation of traditional fans
occurs by means of phase cutting.

This type of regulation is so called as it “cuts” the sinusoid of the power supply.
In this way, the power supply of the electric motor is reduced, increasing the slip and reducing the speed.
This “cutting” of the power supply implies that the motor is as if supplied by a series of sinusoids of
multiple network frequencies.

This therefore creates “anomalous” coupling (i.e. forces) between the stators and the rotors which causes
more noise in the motor in respect to a power supply with a “clean” sinusoid.
In fans with an EC motor the speed is altered by varying the magnetic field, so resulting free from
the phenomenon described above.

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High efficiency
Below are illustrated the results of a comparison of the two units BREC/F 4812A supplied with fans with an
asynchronous motor or EC type.

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ENERGY EFFICIENCY AT PART LOAD: I.P.L.V., E.M.P.E. AND E.S.E.E.R. PARAMETERS

Tandem units are equipped with two separate compressors on the same circuit. The exchange surfaces are
constant and sized for the maximum available power which can be supplied; this means that, when the power is
reduced (partialized unit), the thermal differences in the heat exchangers are reduced (due to an increase in the
evaporation temperature and a decrease in the condensing temperature of the refrigerant cycle) allowing
elevated efficiency even during operation at partial load.

I.P.L.V. and E.S.E.E.R.

Energy indexes define the behaviour of a chiller in particular situations. There are energy indexes which refer to
nominal conditions and seasonal energy indexes, which are more reliable and which enable the average energy
consumption over a year to be calculated.

The principal indexes are the C.O.P. and the E.E.R., while the following stand out from the remainder:
• I.P.L.V.: Integrated Partial Load Value
• E.S.E.E.R.: European Seasonal Energy Efficiency Ratio

The criteria used to establish these indexes allow the annual behaviour of a chiller to be analysed using a single
figure in the considered operating conditions. These parameters are essentially the average found by the E.E.R.
at different loads (100%, 75%, 50% and 25%) and differ from each other regarding the weight given and the
conditions in which the different E.E.R. are calculated.

PE100% ⋅ EER100% + PE 75% ⋅ EER75% + PE50% ⋅ EER50% + PE 25% ⋅ EER25%

 
IPLV − ESSER

Where:
• P.E. is the “weight” given to each operating condition
• E.E.R. represents the energy efficiency at different load conditions

The three parameters are issued from ARI, AiCARR and Eurovent respectively. The I.P.L.V. (Integrated Partial
Load Value) was established by the American ARI Standard 550. Thanks to the E.E.C.C.A.C. study the
European Union is also equipped with a seasonal energy index which is called E.S.E.E.R (European Seasonal
Energy Efficiency Ratio),which is based on experimental tests, and the average European operating conditions.

Note
These indexes are applied to units using the refrigerant circuit throughout the whole year, therefore, it is not
possible to include units with free-cooling devices when calculating these indexes.

I.P.L.V.
The American standard ARI (Air Conditioning & Refrigeration Institute) has put forward an energy index called
I.P.L.V. which is contained in the 550 - 590 Standard and it’s various updates. The I.P.L.V. calculation is made
according to the following formula:

0,01 ⋅ EER100% + 0,42 ⋅ EER75% + 0,45 ⋅ EER50% + 0,12 ⋅ EER25%


IPLV

The calculation conditions are:

Evaporator:
• Outlet temperature: 6,7°C
• Delta T: 5°C (at nominal conditions)
• Constant water flow at partial load
• Fouling factor: 0,018m °C/kW
2

Condenser:
• Fouling factor: 0,044m °C/kW
2

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 Load Weight Tin air condenser Tout water evaporator
% % °C °C
100 1 35 6,7
75 42 26,7 6,7
50 45 18,3 6,7
25 12 12,8 6,7

E.S.E.E.R.
Through the E.E.C.C.A.C. study (Energy Efficiency and Certification of Central Air Conditioners) carried out by
the European Commission, an accurate investigation into the energy efficiency of commercial chillers at nominal
and part load operation has been made. Simulations have been carried out in buildings which are representative
of the European norm with different climatic conditions, the result is an energy index called E.S.E.E.R. which
best represents the real operating conditions of chillers throughout Europe. The formula used to calculate the
E.S.E.E.R. is similar to that used for the I.P.L.V. and the E.M.P.E but with different values for the energy weights
and the conditions on which the E.E.R values are calculated.

0,03 ⋅ EER100% + 0,33 ⋅ EER75% + 0,41 ⋅ EER50% + 0,23 ⋅ EER25%


ESEER

The calculation conditions are:

Evaporator:
• Outlet temperature: 7°C
• Delta T: 5°C (at nominal conditions)
• Constant water flow at partial load

Load Weight Tin air condenser Tout water evaporator

% % °C °C
100 3 35 7
75 33 30 7
50 41 25 7
25 23 19 7

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FREE-COOLING SERIES

If the system involves technological systems or industrial processes which operate continuously throughout the
year, and therefore also with low external temperatures, it is energetically convenient to use systems which
have been designed to exploit these conditions; cooling systems with a free-cooling device are a typical
solution.

ERAF are free-cooling chillers and in these units, if the external temperature is low enough, it is possible to
reduce or even eliminate, depending on the external temperature, the use of the “refrigerant” part of the chiller,
i.e. the compressors, which are the components principally responsible for energy consumption by exploiting the
air / water exchangers which are integrated in the unit itself. In this way, chilled water is produced using external
air and energy consumption is therefore limited to the fans.

Chilled water can therefore be available at absolutely no cost. Since, when the climatic profiles of the main
European cities are analysed, the most frequent temperatures are between 0 and 15°C, it is important to design
free-cooling methods which maximise performance within this temperature range.

For this reason, Uniflair units which are equipped with free-cooling devices allow operation even when the
external temperature is able to guarantee only partial rather than complete dissipation of the thermal load. In
these cases, operation is usually called mixed: the refrigerant uses external air to pre-cool the water in the
system, allowing the compressors to work less and create energy savings. In fact, the thermal load which needs
to be dissipated by the evaporator is less then that of a standard chiller operating in the same conditions.

There are, therefore, three operating modes:

Power Absorbed

Free-cooling
Mechanical
cooling

Free-cooling &
Direct expansion
5 15 Text [°C]

• Mechanical cooling: with temperatures higher than 15°C, a free-cooling unit operates as a traditional chiller,
dissipating the thermal load of the evaporator with the compressors (fans and compressors operating).

• Mixed: when the external temperature is between 5 and 15°C, the air guarantees only partial, rather than
complete, dissipation of the thermal load. At lower temperatures the control system activates the free-
cooling pump at 15°C and the water is routed to the air / water exchangers which are placed in series in the
evaporator, dissipating at a lower thermal load (fan operation, free-cooling pump and, in part, the
compressors).

• Free-cooling: when the external temperature is low enough, the air / water exchangers allow the complete
dissipation of the thermal load without needing the compressors (fan operation and free-cooling pump).

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 Annual energy consumption
Standard unit

Free-cooling unit

34/36 28/30 22/24 16/18 10/12 4/6 -2/0 -8/-6 -12/-14

Text [°C]

OPERATION PRINCIPLE

The idea behind the free-cooling mode is, as mentioned above, that of producing chilled water using external air
instead of direct expansion operation. When the external air temperature is low enough, the microprocessor
control system activates the free-cooling mode: water is circulated by the free-cooling pump inside special heat
exchange coils and cooled by external air forced in by the fans, which, together with the pump, are the only
components which absorb energy. The water is then conveyed back into the circuit and supplied to the
equipment.

E
D

A. Free-cooling pump
B. Free-cooling coil
C. Condenser coil
D. Scroll compressor
E. Expansion valve
F. Evaporator

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It is important to bear in mind that an installation’s heat load - i.e. the amount of “cold” energy required -
depends on both the heat generated inside it (hence machinery, people, lights…) and the external temperature.
Generally, therefore, the heat load in summer will be greater than in the winter months. Based on this premise,
we can reasonably assume that if the chilled water produced needs to have a temperature of approx. 7°C during
the warmer months, during the colder months Toutlet water = 10°C may be sufficient. Based on these assumptions,
the unit can work in full free-cooling mode with a Texternal as high as 5°C.

Nonetheless, there is a temperature range within which, even though production of water at 10°C cannot be
assured with free-cooling mode alone, it is still convenient to use the free-cooling coils to pre-cool the water
returned from the equipment, therefore making the cooling part “work” less, thus achieving energy savings. The
range in question varies depending on the model and load, though we can assume it will be between 5°C and
15°C.

To sum up, operating ranges for BREF units can be split into:
• Free-cooling, with Text < 5°C
• Mixed, with 5°C < Text < 12 to 15°C
• Mechanical cooling (direct expansion) with Text > 12 to 15°C

INTELLIGENT FREE-COOLING SERIES

Redundancy: “N+1”
When designing systems for which uninterrupted service must be guaranteed, reliability is fundamental.
Technological environments, i.e. rooms which contain technological equipment and/or particular processes
which require guaranteed uninterrupted optimum operating conditions, as well as many industrial processes,
very often have higher breakdown costs than the cost of the equipment itself.

Designing a reliable system means choosing both a unit which is intrinsically reliable, and therefore designed
and built in such way as to guarantee an extremely low breakdown and inefficiency percentage, as well as
creating suitable reserves: the system is equipped with one or more additional units, and for this reason we
speak of the “n+1” logic, which ensures that there is always a unit in “stand-by” which guarantees emergency
intervention when, for any reason, a system component shows signs of having problems.

Intelligent free-cooling
By combining the above concepts in applications where uninterrupted operation is required, units equipped with
a free-cooling device featuring a redundancy logic can be installed and therefore part of the available cooling
capacity is in stand-by. The same consideration can be made regarding the available free-cooling capacity.
The principle which forms the basis of intelligent free-cooling is that of also exploiting, when external
temperatures allow, the air / water exchangers of the unit/s in stand-by.

By linking all of the air / water exchangers together, it is possible for the water which is to be cooled to flow
through all of the free-cooling coils which are available. Thanks to the fact that in Uniflair free-cooling units the
water is sent to the free-cooling coils by a pump and not by a simple three-way valve, it is in fact possible, to
also use the exchangers of the units in stand-by and therefore increase the free-cooling capacity which is
available and therefore its application, with evident advantages in terms of energy saving.

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Installation with units equipped with an onboard pump
In the event of a unit operating with an onboard pump for the primary circuit, the installation is usually as
illustrated below.

1 2 3

A A A

C C C

F F F
D B D B D B

E E E

A Free-cooling coil E Check valve

B Free-cooling pump F Motorized valve
C Evaporator Supplied by Uniflair
D Main pump (onboard the unit) Not supplied by Uniflair

By analyzing a situation such as the following, where unit 1 is in stand-by, units 2 and 3 are operating and the
three units are connected together with an intelligent free-cooling solution and when the external temperature is
low enough for free-cooling to be activated, the control of the two units which are operating activates the fans in
the stand-by unit (1) and the free-cooling pump (B) of the units themselves (2 and 3); this happens in such a
way that the water arriving from the system is sent to all of the available free-cooling coils. In fact, since the
stand-by unit is also linked, the water also flows through its air / water exchangers (see the following diagram).

1 2 3

stand-by ON ON

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System equipped with a pump for the primary circuit outside the unit
If there isn’t an onboard pump, but one has been mounted up or downstream from the chillers, it is necessary to
equip the unit with devices which isolate the stand-by unit.

During operation, the stand-by unit is isolated by the motorized valve which is placed on the aspiration line and
the non return valve which is placed on the discharge line. In the following diagram, operation with units 1 and 3
operating and unit 2 in stand-by is shown.

1 2 3

OFF

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 B B B

D D D

A-OFF A-ON A-ON

C C C

E-OFF E-ON E-ON F

A Free-cooling coil E Check valve

B Free-cooling pump F Motorized valves
C Evaporator Supplied by Uniflair
D Main pump (onboard the unit) Not supplied by Uniflair

GLYCOL-FREE FREE-COOLING SERIES

Created for applications where the use of anti-freeze solutions are not permitted, the glycol free solution allow
the possibility to fill up with glycoled water the free-cooling circuit only, leaving pure water on all the other part of
the circuit. The unit is fitted with an onboard intermediate heat exchanger which isolates the principal hydraulic
circuit and the free-cooling circuit as per the following drawing.

Of course correct anti-freeze method must be chosen for the hydraulic section which uses pure water.

The careful selection and the position of the intermediate heat exchanger permits to install main pump onboard
of the unit as per traditional Uniflair free-cooling chillers and it allows to minimize the reduction in the efficiency
which is normally introduced by an additional heat exchange between the fluids which are chilled by the unit.

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GENERAL TECHNICAL DATA

BREC – F 1602A 1802A 2202A 2502A 2802A 3212A 3612A 4212A 4812A
Power supply V/ph/Hz 400 / 3 / 50
Refrigerant R134a
Fans Nr 6 6 8 8 8 10 10 12 12
Type Axial with asynchronous motor
Standard model
poles 6 6 6 6 6 6 6 6 6
EC model Nr Axial with electronically commutated motor
Circuits Nr 2 2 2 2 2 2 2 2 2
Compressors Nr 2 2 2 2 2 2 2 2 2
Compressor Type Double Screw
Evaporator Type Shell & Tube
Partial heat
recovery heat Type Plate Shell & Tube
exchanger

TECHNICAL DATA: NOMINAL CONDITIONS

The technical data shown in the following pages refer to nominal conditions and tolerances which are as follows:

Nominal conditions BREC BREF

Operation mode Cooling Cooling Free-cooling
Inlet / outlet water temperature °C 12 / 7 15 / 10 15
External air temperature °C 35 35 5
Ethylene glycol % 0 20 20
Nominal power supply tolerance R0 400V +/- 10%
Storage conditions C0 between – 20°C e + 45°C for all models

Note
A general design guideline for data centres, where reducing energy consumption and optimising available
resources is becoming increasingly more significant, is to adopt solutions featuring chilled water air conditioning
units linked to chillers with a free-cooling system, sized in order to optimize operation. This system is based on a
chilled water temperature which is higher than the “classic” 7°C, with the aim of increasing the free-cooling
capacity and lowering the electrical absorption of the chiller.

This trend can be seen above all in applications used in data centres featuring high density servers, using air
conditioning units with temperature control on the discharge where the return temperature is higher than that of
standard consolidated units which consequently increases the performance of the close Control units. Since
optimising resources is the best solution to reduce consumption, Schneider-Electric™ fully supports this trend,
promoting it first hand as well as encouraging it and facilitating the sizing of sites which are designed in this way.

For this reason, the technical data regarding chillers equipped with free-cooling are based on inlet and
outlet water temperatures of 15/10°C rather than 12/7°C.

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TECHNICAL DATA: CORRECTION FACTORS

If antifreeze mixtures are being used, some of the unit’s specifications given in the table (capacity, water delivery,
load loss) will change.

Correction factors are given below for calculating the data based on different percentages of ethylene glycol.

Minimum fluid temperature with unit operating 5,0 °C 3,0 °C -5,0 °C -10,0 °C -18,0 °C -28,0°C

Freezing temperature 0 °C -4,4 °C -9,6 °C -16,1 °C -24,5 °C -35,5 °C

Percentage of ethylene glycol by weight 0% 10% 20% 30% 40% 50%

Correction factors % 0% 10% 20% 30% 40% 50%

Cooling capacity R0 1 0,985 0,98 0,97 0,96 0,95
Compressor power consumption P0 1 0,995 0,99 0,98 0,98 0,97
Volumetric flow rate L0 1 1,02 1,05 1,08 1,10 1,14
Evaporator / condenser pressure drop C0 1 1,10 1,25 1,40 1,60 1,7

Corrected cooling capacity (**) = Nominal cooling capacity x R0.

Corrected compressor power consumption (**): Nominal absorbed power x P0.
Corrected volumetric flow rate (**):Nominal volumetric flow rate x L0.
Corrected evaporator pressure drop, water side (**): Evaporator pressure drop x Co.
(**) with the same evaporator inlet and outlet temperatures 12/7

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NOMINAL TECHNICAL DATA

BREC
Cooling only unit
Cooling capacity
(1)
kW 359
BREC
1602A 1802A 2202A 2502A 2802A 3212A 3612A 4212A 4812A

448 503 534 635 704 819 920 1039

(2)
Absorbed power kW 109,3 141,9 158,3 171,0 206,4 226,6 265,9 290,1 329,9
(2)
E.E.R. 3,39 3,25 3,34 3,27 3,23 3,25 3,22 3,27 3,3
(3)
E.S.E.E.R. 4,11 4,24 4,19 4,21 4,29 4,48 4,77 4,37 4,64
(4)
I.P.L.V. 4,68 4,83 4,78 4,82 4,94 5,20 5,50 5,00 5,35
(1)
Water flow l/h 62865 78825 89447 94237 114733 124560 144720 162720 185400
Evaporator pressure
(1) kPa 29 48 51 56 55 42,2 63,8 51,4 34,9
drop
(1) 3
Air flow m /h 121875 116813 162500 162500 155750 203125 194688 233625 233625

BREC
Cooling only unit with
economizer
BREC
1602A 1802A 2202A 2502A 2802A 3212A 3612A 4212A 4812A

(1)
Cooling capacity kW 384 486 549 582 709 776 891 1005 1126
(2)
Absorbed power kW 119,3 157,4 180,5 190,5 248,9 264,7 302,6 333,3 277,2
(2)
E.E.R. 3,29 3,13 3,23 3,14 3,05 3,07 3,09 3,16 3,21
(3)
E.S.E.E.R. 4,23 4,31 4,28 4,26 4,38 4,60 4,72 4,40 4,59
(4)
I.P.L.V. 4,78 4,91 4,85 4,89 5,00 5,20 5,55 5,05 5,40
(1)
Water flow l/h 67610 85348 96427 101963 124180 136646 156647 175872 200369
Evaporator pressure
(1) kPa 33 55 58 64 64 49,7 73,6 62,8 40
drop
(1) 3
Air flow m /h 121875 116813 162500 162500 155750 203125 194688 233625 233625

(1) Data refer to nominal conditions: Inlet / outlet water temperature: 12 / 7 °C; External air temperature 35 °C; glycol 0%
(2) Data refer to total input power.(compressors and fans)
(3) European Seasonal Energy Efficiency Ratio
(4) Integrated Partial Load Value

31 Aquaflair Chillers Technical Specifications 990-5091-001

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BREF
Free-cooling unit
Cooling capacity
(1)
kW 386
BREF
1602A 1802A 2202A 2502A 2802A 3212A 3612A 4212A 4812A

474 541 575 685 764 683 980 1099

(2)
Absorbed power kW 115,2 151,8 167,1 181,2 220,5 240,2 285,1 311,6 361,5
(2)
E.E.R. 3,47 3,20 3,37 3,31 3,19 3,32 3,17 3,25 3,26
(1)
Water flow l/h 73493 89422 102413 108402 117823 143698 162360 183600 209880
Evaporator pressure
(1) kPa 44 66 73 81 77 62 88,8 72 49
drop
(1) 3
Airflow m /h 112500 105000 150000 150000 140000 187500 175000 210000 200379
(3)
Free-cooling capacity kW 256 308 347 351 417 510 602 711 726
Absorbed power in free-
(3-4) kW 16,7 17,6 23,9 24,1 25,4 28,5 29,4 38,2 38,6
cooling
(3-4)
E.E.R. in free-cooling 15,34 17,52 14,50 14,53 16,43 17,9 20,5 18,6 18,8

BREF
Free-cooling unit with
economizer
BREF
1602A 1802A 2202A 2502A 2802A 3212A 3612A 4212A 4812A

(1)
Cooling capacity kW 386 503 584 611 745 835 940 1065 1183
(2)
Absorbed power kW 116,2 166,8 188,6 197,6 255,0 280,7 331,7 357,5 425,1
(2)
E.E.R. 3,35 3,12 3,21 3,19 3,04 3,12 3,04 3,1 3,08
(1)
Water flow l/h 76394 95000 108531 115387 140382 157680 175680 199440 220424
Evaporator pressure
(1) kPa 47 76 81 90 90 73 103 83,7 56,4
drop
(1) 3
Airflow m /h 112500 105000 150000 150000 140000 187500 175000 210000 226267
(3)
Free-cooling capacity kW 260 312 352 356 423 510 602 711 726
Absorbed power in free-
(3-4) kW 16,9 17,7 24,2 24,5 25,8 28,5 29,4 38,2 38,6
cooling
(3-4)
E.E.R. in free-cooling 15,42 17,63 14,54 14,56 16,44 17,9 20,5 18,6 18,8

(1) Data refer to nominal conditions: Inlet / outlet water temperature: 15 / 10 °C; External air temperature 35 °C; glycol 20%
(2) Data refer to total input power.(compressors and fans)
(3) Data refer to nominal conditions: Inlet water temperature: 15 °C; External air temperature 5 °C; glycol 20%
(4) Data refer to (fans and free-cooling pump) input power

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DIMENSIONS and WEIGHTS

Models 1602A 1802A 2202A 2502A 2802A 3212A 3612A 4212A 4812A
(**)
Height mm 2510 2510 2510 2510 2510 2510 2510 2510 2510

Depth mm 4985 4985 6415 6415 6415 8890 8890 10320 10320

Width mm 2200 2200 2200 2200 2200 2200 2200 2200 2200

Weights (BREC)
Weight (basic version,
without hydraulic kit) Kg 4196 4552 4828 4856 5340 6889 7189 7956 7995
(*)

Weight (basic version

(*) Kg 4396 4752 5054 5086 5568 7200 7500 8332 8368
with 1 pump)
Weight (version with 2
(*) Kg 4506 4862 5174 5206 5688 7320 7620 8527 8563
pumps)
Weights (BREF)
Weight (basic version,
without hydraulic kit) Kg 4912 5356 5791 5819 6423 7987 8287 9478 9517
(*)

Weight (basic version

(*) Kg 5112 5558 6019 6049 6651 8298 8598 9854 9893
with 1 pump)
Weight (version with 2
(*) Kg 5222 5668 6139 6169 6771 8418 8718 10049 10088
pumps)
Options

Partial heat recovery Kg 54 54 92 92 110 322 322 330 330

Ultra low noise

Kg 200 200 200 200 200 505 505 550 550
version

Economizer Kg 35 35 45 45 45 80 80 85 85

(*) with empty hydraulic circuit

(**) without vibration supports

33 Aquaflair Chillers Technical Specifications 990-5091-001

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WORKING SPACE
The diagram below shows the minimum recommended distance to be left clear for correct unit operation and to
allow access to the unit for maintenance.

WARNING:
prevent air recirculation between the air discharged and taken in by the condenser.

Note: The dimensions are in mm.

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ANTI-VIBRATION SUPPORTS

Type 1450/C 910/C

Spring number 8 5
Height mm 103 100
Springs Steel C72 with epoxy paint Steel C72 with epoxy paint.
Materials Bases Elastomer with metal insert. Elastomer with metal insert.
Base Lexan with metal insert Lexan with metal insert
Deflection mm 27 27
Natural
Hz 3 3
frequency
Load Kg 1450 910
Elastic constant Kg/mm 54 33.5

1450/C 910/C

REFRIGERANT CONTENT

The table below shows the refrigerant content for the basic version. These values are indicative and the
quantities may vary slightly due to adjustments made during end of line testing.

The above data refer to the basic version of each unit, i.e. it goes without saying that the amount may vary
depending on the configuration of the unit itself.

BREC - F 1602A 1802A 2202A 2502A 2802A 3212A 3612A 4212A 4812A
Circuit 1 Kg 47 48 63 64 65 78 80 95 96
Circuit 2 Kg 47 48 63 64 65 78 80 95 96

35 Aquaflair Chillers Technical Specifications 990-5091-001

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 HYDRAULIC CIRCUIT

BREC/F units are available with the following hydraulic configurations:

• Without pump
• Units equipped with 1 pump
• Units equipped with 2 pumps

Unit equipped with 1 or 2 pumps

• REV: anti-freeze heater

• TUA: outlet water temperature sensor
• VS: safety valve

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HYDRAULIC CONNECTIONS

The pipework connections are produced in steel. The free-cooling circuit is produced in steel with flexible
connections to the air/water exchangers in order to eliminate the generation of vibrations and to render the
complete structure flexible during the stages of movement. These connections are also available in copper on
request.

37 Aquaflair Chillers Technical Specifications 990-5091-001

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HYDRAULIC CONNECTIONS

The units are supplied with Victaulic type hydraulic connections. Pipework of this type is composed of two parts:
the pipework predisposed for a Victaulic clamp and the Victaulic clamp itself.

The units are only supplied with the pipework.

Available as options are:

• Victaulic pipe joints: this option includes the fixing clamp and rolled stub pipe for soldering to the installation.
• Flanged attachments: this option includes the fixing clamp and reduction of the rolled/flanged tube.

Victaulic/flanged pipe reduction Victaulic fixing clamp

Table of correspondence between the different types of hydraulic connections

Threaded connections GAS (BSP) Flexible (Victaulic) joints
Flanged connections
Male Female est. Ø pipe to be welded [mm]

G 1" M G 1" F OD 33.7 DN 25

G 1"1/4 M G 1"1/4 F OD 42.4 DN 32
G 1"1/2 M G 1"1/2 F OD 48.3 DN 40
G 2" M G 2" F OD 60.3 DN 50
G 2"1/2 M G 2"1/2 F OD 76.1 DN 65
G 3" M G 3" F OD 88.9 DN 80
G 4" M G 4" F OD 114.3 DN 100
G 5" M G 5" F OD 139.7 DN 125
G 6" M G 6" F OD 168.3 DN 150
G 8" M G 8" F OD 219.1 DN 200

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INVERTER DRIVEN PUMPS (optional)

The BREC/F large chiller range can be fitted with onboard primary circulation pump/s. When the pressure drop
and the water flow do not remain constant, either during the chiller operation or during the evolution of the
installation, it is possible to install a completely integrated inverter-driven circulation pump/s.

This solution allows to modify the water flow rate by varying the pump rotation speed. Choosing for this option,
the unit is equipped with a pump (one or two, with 1+1 logic) which is connected to an VSD (inverter) driven by
the chiller control board. In the event of units fitted with two pumps, the inverter is usually shared between the
pumps. It is installed onboard into a protected box (IP54) and it is completely connected to the main power
supply and driven by the mainboard.

The inverter, which is located at the rear of the unit, is controlled by the mainboard and the water flow can be
modified according to two different logics, i.e.
A. Flexible operation: unit operation with constant speed pump
B. Autoadaptive operation: Unit operation with variable speed pump and constant available head pressure

Flexible operation
With the logic (a), the control board permits to set a value for the inverter speed. The unit operates with this
settings until it is modified. Modifications can be done directly on the local user terminal or on the remote user
terminal of the unit or from the Building Management System. This solution is necessary when the pressure drop
of the system is not completely known or an extension is scheduled, expected or simply possible. Once the
chiller is installed the pressure drop / water flow is setted on the control board according the site features and
the required deltaT on the inlet / water temperatures. In the event of any modifications on the site the operating
parameters can be changed in order to adjust the correct operation of the unit/s.

Autoadaptive operation
With logic (b) the unit is equipped with additional pressure transducers on the chiller water circuit. Once the
1
chiller is installed the required available pressure can be defined on the unit. The information from the sensors
permits to the control board to maintain this setting in all the different pressure drop conditions, and therefore
constant deltaP through the unit. This solution is useful when the pressure drop of the system can vary during
the chiller operation like installations where the CRACs are fitted with 2-way valves or there are separate water
circuits. The control board monitors the pressure drop through the unit and it modify the inverter speed and,
consequently, the available head pressure of the pump. The settings for the required available head pressure
can be done directly on the local user terminal or on the remote user terminal of the unit or from the Building
Management System

1
If the transducer and/or expansion card fails, the pump operates at full speed.

39 Aquaflair Chillers Technical Specifications 990-5091-001

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HYDRAULIC CONNECTIONS

BREC - F 1602A 1802A 2202A 2502A 2802A 3212A 3612A 4212A 4812A
Main hydraulic connections 4” - OD 114.3 5” - OD 139.7 6” - OD 168.3

Type Victaulic
Main hydraulic connections
DN 100 DN 100 DN 100 DN 100 DN 100 DN 125 DN 125 DN 150 DN 150
(optional)
Type Flanged
Partial heat recovery
2”M 2”M 2”M 2”M 2”M 1” 1/2F 1” 1/2F 1” 1/2F 1” 1/2F
hydraulic connections
Type BSP
Intelligent free-cooling
DN100 DN100 DN100 DN100 DN100 DN100 DN100 DN125 DN125
connections
Type Flanged

WATER CIRCUIT CAPACITY

The table below shows the capacity (liters) of the water circuit in basic units

BREC 1602A 1802A 2202A 2502A 2802A 3212A 3612A 4212A 4812A

Evaporator liters 140 140 160 160 256 250 250 420 420

The table below shows the capacity (liters) of the water circuit in basic units (“free-cooling”)

BREF 1602A 1802A 2202A 2502A 2802A 3212A 3612A 4212A 4812A

Evaporator liters 140 140 160 160 256 250 250 420 420
Free-cooling coils liters 150 186 200 200 250 300 300 360 360

RECOMMENDED MINIMUM PLANT CAPACITY

The table below shows the recommended minimum plant capacity

BREC/BREF 1602A 1802A 2202A 2502A 2802A 3212A 3612A 4212A 4812A
Recommended
minimum plant liters 1000 1150 1300 1400 1600 1800 2000 2400 2600
capacity

MAXIMUM WORKING PRESSURE OF HYDRAULIC CIRCUIT

Maximum working pressure of hydraulic circuit P0 10

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HEAT EXCHANGERS CORROSION RESISTANCE TABLE

The tables shown below provides a summary evaluation of the substances which could create problems linked to
corrosion. No guarantees can however be deduced from this table due to the complex and carious chemical
reactions involved in each particular situation

Approximate concentration area Compatibility with Standard heat

BREC-F
[mg/I] exchanger

pH-value 7 ÷ 9 (Value) OK
<3
Chloride CIˉ OK
3 ÷ 50
Free Chlorine CI2 <0, 5 OK
< 50
Sulphate SO4ˉˉ OK
50 ÷ 100
<5 OK
Free Carbon Dioxide CO2
5 ÷ 50 *
HCO3ˉ / SO4ˉˉ > 1 (Value) OK

Nitrate < 100 OK

Hydrogen Sulphide H2S < 0,05 OK

< 0,1 OK
Oxygen O2
0,1 ÷ 2 *
+ <2
Ammonium NH4 OK
2 ÷ 20
3-
Phosphate PO4 <2 OK
3+
Iron and Manganese Fe
++ < 0,5 OK
/ Mn
Depositable (organic)
0 (Value) **
substances
Hardness 4 ÷ 8.5dH OK

Note:
• These data do not consider the effects of any bio-pollution present in the water
• Nominal performance data calculated with a fouling factor of 0.043m2°C/kW
• * Corrosion problems could arise, especially when several factors are evaluated together
• ** Corrosion problems could arise when they are present in certain situations

41 Aquaflair Chillers Technical Specifications 990-5091-001

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EVAPORATOR PRESSURE DROP

Data refer to 0% glycol.

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PUMP HEAD PRESSURE AND UNIT PRESSURE DROPS

The available head pressure is the difference between the “pump head pressure” curve and the curve for load
losses.

Data refer to 0% glycol.

43 Aquaflair Chillers Technical Specifications 990-5091-001

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PUMP HEAD PRESSURE AND UNIT PRESSURE DROPS

The available head pressure is the difference between the “pump head pressure” curve and the curve for load
losses.

Data refer to 0% glycol.

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PUMP HEAD PRESSURE AND UNIT PRESSURE DROPS

The available head pressure is the difference between the “pump head pressure” curve and the curve for load
losses.

Data refer to 0% glycol.

45 Aquaflair Chillers Technical Specifications 990-5091-001

06ME031@00B0150
 A GUIDE TO THE SIZING OF THE EXPANSION VESSEL

The project elements to consider when selecting the dimensions of the expansion vessel for a system are:
• C The quantity of water in the system in liters
• e The expansion coefficient of the water, calculated as the maximum temperature difference between
when the system is off and when the system is running (the values are given in the table below)
• pi The absolute initial pressure, equivalent to the pre-charge pressure of the expansion vessel (normally
2.5 bar, i.e. 1.5 bar-r)
• pf The absolute tolerated pressure, must be less than the pressure at which the safety valve is set, taking
into account of any difference in height between the valve and the expansion vessel.

The total capacity of the expansion vessel is expressed as:

C ⋅e
Vt =
p
1− i
pf

using the expansion coefficient values in the following table.

WATER EXPANSION COEFFICIENT

Water temp. Density e

3
[°C] [kg/m ] (at 10°C)
60 983.2 0.0167

70 977.8 0.0223

80 971.8 0.0286

90 965.3 0.0355

100 958.4 0.0430

It is also possible to calculate the average value of ‘e’ between the initial water temperature (generally assumed
to be 10°C) and the operating temperature, using:

e = 7,5 ⋅ 10 −6 ⋅ (T − 4 )
2
T [°C]

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PARTIAL HEAT RECOVERY

In the BREC/F range, partial heat recovery is carried out by plate/tubular heat exchangers placed between the
discharge section of the compressor and the air condenser; the following diagram shows the recovery circuit
within the unit and the circuit used.

For correct operation of the chiller it is necessary to avoid supplying the recovery exchanger (R) with water which
is too cold (temperatures lower than 30°C).

For this reason, it is advisable to install a 3-way valve (MV) as shown in the diagram.

RL
P

B R W

V MV

B Condensing coils
C Scroll compressors
V Expansion valve
E Evaporator
R Recuperator
RL Liquid receiver (only for ERAH)
P Circulation pump
W Water tank
MV 3-way valve

Partial condensation heat

1602A 1802A 2202A 2502A 2802A 3212A 3612A 4212A 4812A
recovery
Cooling capacity kW 365 458 519 547 661 710 842 932 1040
Absorbed power kW 108 141 156 169 206 217 256 282 318
Heat recovery heating
kW 68 91 100 107 135 146 170 188 209
capacity
Heat recovery water flow l/h 11850 15652 17430 18559 23500 25112 31000 32336 35950
Heat recovery pressure drop kPa 13 23 11,5 13 20 45 57 52 63

Data refer to nominal conditions for both heat recovery: inlet / outlet water temperature 12 / 7 °C; external temperature: 35 °C; Heat recovery water
temperature: 40/45°C; glycol 0%

47 Aquaflair Chillers Technical Specifications 990-5091-001

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OPERATING LIMITS

BREC
The BREC units are equipped with modulation control and oil heaters for the mass produced compressors, still,
depending on requirements, it is necessary to select the different options.

The available options are:

• Low ambient temperature: the unit will be equipped with anti-condensation resistance for the circuit board.
• High ambient temperature: the unit will be equipped with compressors provided with motors capable of
operating with high condensation temperatures. These motors are standard for the models 1602A – 1802A –
2202A – 2502A – 2802A.
• Low water temperature production: the units are predisposed for the production of glycoled water at low
temperature.
Note: for units with economizer consider a reduction in max ambient temperature of 2°C

Glycol water mixtures can be cooled down to -10°C as long as the water in the circuit contains enough antifreeze
to prevent freezing inside the evaporator

Minimum fluid temperature with unit operating 5,0 °C 3,0 °C -5,0 °C -10,0 °C -18,0 °C -28,0°C
Freezing temperature 0 °C -4,4 °C -9,6 °C -16,1 °C -24,5 °C -35,5 °C
Percentage of ethylene glycol by weight 0% 10% 20% 30% 40% 50%

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BREF
The BREF units can be predisposed to operate in high ambient temperatures: the unit will be provided with
compressors equipped with motors capable of operating in high condensation temperatures. These motors are
standard for the models 1602A – 1802A – 2202A – 2502A – 2802A.
Note: for units with economizer consider a reduction in max ambient temperature of 2°C

49 Aquaflair Chillers Technical Specifications 990-5091-001

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External temperature management

The BREC/F units are provided with modulating condensation control, therefore the influence of the external
temperature variations on the condensation pressures are managed by varying the speed of the ventilating
sections. In the event the external temperatures are such that the maximum condensation pressure is reached
even with the fans at maximum speed, the control software automatically reduces the capacity of the
compressors, consequently reducing the condensation pressure and maintaining the unit in operation, even if
with a lower capacity (unloading).

Note: The maximum external temperature values declared refer to the unit without this procedure
activated.

Therefore, if the unit has a maximum operating temperature of TMAX (45 or 50°C) it will have the following
operational states:
• T < TMAX normal operation, the condensation pressure is regulated by means of the fan speed.
• T > TMAX Activation of the unloading procedure the condensation pressure is reduced.
• T > TMAX Despite unloading, the condensation pressure is close to the maximum limit, the unit enters in
stand-by with the aim of avoiding the necessity for manual resetting of the unit (high pressure
alarm).

WATER TEMPERATURE: PRECISION ON SET-POINT

BREC/F chillers are fitted with two double screw compressors, which perform eight steps each. The control
system regulates the temperature of the chilled water by switching the compressors on and off and regulating the
slide valve of each single compressor. By changing the position of the slide valve according to the heat load, 4
steps are available; in this way it is possible to change the cooling capacity from 25% to 100%; overall, each unit
may be controlled by means of 8 partialization steps.

All of the units use an algorithm to control the temperature of the chilled water based on the discharge
temperature of the water. Moreover, the algorithm uses the inlet water temperature to minimise the compressor
start-ups; in fact, a PID algorithm controls the discharge temperature of the water proportionally, but also uses an
integrated and derivative process on the inlet water temperature to minimise the compressor start-ups. In this
way, the Uniflair control system can be considered an evolution compared to the traditional systems of control
which operate “predictably” on the discharge water temperature.

Thanks to this software it is possible to obtain an increased level of precision regarding the required temperature
(between +/-0,6°C on the set-point) even without a water tank, protecting the compressors and their minimum
start up times at the same time.

The following tables show data referring to a system with a minimum water rate of 2.5 l/kW.

Outlet water ∆T Thermal load

±1,6°C < 16% of nominal load
±1°C Between 16% and 25% of nominal load
±0,3°C > 25% of nominal load

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NOISE PRESSURE LEVEL

The SOUND PRESSURE levels (measured with BRÜEL & KJǼR class 1 sound-level meter mod. 2260) for each
octave band frequency, measured with units working at full load, free-field conditions with Q=2, 10m away from
the unit condensing coil according to ISO3744-3746.

SOUND POWER level for each octave band frequency supplied in compliance with standard ISO3744-ISO3746.

The tolerance on the data is equivalent to +/- 2 dB (A).

Note: the data supplied refers to units working based on factory settings and units without onboard pumps.

51 Aquaflair Chillers Technical Specifications 990-5091-001

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NOISE PRESSURE LEVEL TAKEN AT DIFFERENT POSITIONS AND DISTANCES
The attenuation of the noise pressure level is calculated according to the following:

(3⋅ L +1) (3⋅ H +1)  D  (3⋅ L +1) (3⋅ H +1)


A = 10 ⋅ log L D
+H D
+ D  − 10 ⋅ log  rif  ⋅  L D
+H D
+ Drif 
   D   

Where
A: Noise attenuation [dB(A)]
L: Length of the unit [m]
H: Height of the unit [m]
D: Distance [m]

Distance m 1 2 3 4 5 6 7 8 9 10
Variation dBA +14 +11 +9 +7 +6 +5 +3 +2 +1 0

It is possible to calculate the noise pressure level at the desired distance or unit side: electrical board side or on
the sides. The delta which need to be added to the data contained in the following pages are indicated in the
following table.

Low noise unit

Position Electrical board side Rear side
Attenuation dBA -2 -4

Ultra-low noise unit

Position Electrical board side Rear side
Attenuation dBA -3 -4

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NOISE LEVEL
Low noise version

NOISE PRESSURE LEVEL

63Hz 125Hz 250Hz 500Hz 1000Hz 2000Hz 4000Hz 8000Hz Lp

Model
[dB(A)] [dB(A)] [dB(A)] [dB(A)] [dB(A)] [dB(A)] [dB(A)] [dB(A)] [dB(A)]
1602A 23,9 23,9 27,1 42,7 47,3 59,9 52,3 43,9 61,0
1802A 24,6 30,2 47,0 53,6 59,7 48,6 40,9 28,1 61,1
2202A 25,3 30,8 52,6 52,6 59,2 50,0 41,9 34,5 61,2
2502A 25,1 30,2 50,6 52,8 57,8 49,8 42,5 35,2 60,1
2802A 24,5 26,8 48,1 52,4 57,0 56,2 47,4 36,2 60,9
3212A 27,6 37,8 51,3 54,7 60,1 53,4 48,3 38,6 62,4
3612A 27,4 28,6 41,9 54,0 56,6 59,2 53,5 44,7 62,6
4212A 27,8 34,1 56,3 57,1 58,5 55,4 44,4 38,0 63,1
4812A 27,6 34,4 54,8 56,1 60,8 55,2 46,7 38,4 63,6

NOISE POWER LEVEL

63Hz 125Hz 250Hz 500Hz 1000Hz 2000Hz 4000Hz 8000Hz Lw

Model
[dB(A)] [dB(A)] [dB(A)] [dB(A)] [dB(A)] [dB(A)] [dB(A)] [dB(A)] [dB(A)]
1602A 54,9 54,9 58,2 73,8 78,4 91,0 83,4 75,0 92,0
1802A 55,7 61,3 78,0 84,7 90,8 79,7 72,0 59,8 92,2
2202A 56,3 61,9 83,7 83,7 90,3 81,1 73,0 65,6 92,3
2502A 56,1 61,3 81,6 83,9 88,9 80,9 73,5 66,3 91,2
2802A 56,1 58,5 79,8 84,1 88,7 87,9 79,0 67,9 92,5
3212A 59,4 69,6 83,1 86,5 91,9 85,2 80,1 70,4 94,3
3612A 59,2 60,4 73,7 85,8 88,4 91,0 85,3 76,5 94,4
4212A 60,1 66,4 88,6 89,4 90,7 87,7 76,7 70,2 95,3
4812A 60,1 66,8 87,2 88,5 93,2 87,6 79,1 70,9 96,0

53 Aquaflair Chillers Technical Specifications 990-5091-001

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NOISE LEVEL
Ultra low noise version
Ultra-low noise version - Equipment
Ultra-low noise units are equipped with sound-proofing for compressors and mufflers on the discharge side of the
compressors.

NOISE PRESSURE LEVEL

63Hz 125Hz 250Hz 500Hz 1000Hz 2000Hz 4000Hz 8000Hz Lp

Model
[dB(A)] [dB(A)] [dB(A)] [dB(A)] [dB(A)] [dB(A)] [dB(A)] [dB(A)] [dB(A)]
1602A 23,3 23,3 25,5 38,6 43,9 53,6 46,6 40,2 55,0
1802A 23,7 27,5 41,3 47,7 53,4 44,8 39,3 26,1 55,2
2202A 24,6 28,3 46,1 47,4 53,2 46,1 40,5 34,2 55,6
2502A 24,5 27,9 44,4 47,5 52,2 46,0 40,6 34,4 54,8
2802A 23,9 25,6 42,3 47,1 51,5 49,4 42,1 34,1 55,0
3212A 26,7 29,2 41,4 51,4 54,4 50,1 42,9 36,7 57,5
3612A 27,4 34,5 45,7 49,9 54,8 49,4 44,7 37,6 57,6
4212A 27,4 32,7 47,2 50,6 54,4 49,7 44,1 37,6 58,0
4812A 27,4 32,7 47,2 50,6 54,4 49,7 44,1 37,6 58,4

NOISE POWER LEVEL

63Hz 125Hz 250Hz 500Hz 1000Hz 2000Hz 4000Hz 8000Hz Lw

Model
[dB(A)] [dB(A)] [dB(A)] [dB(A)] [dB(A)] [dB(A)] [dB(A)] [dB(A)] [dB(A)]
1602A 54,4 54,4 56,6 69,7 75,0 84,7 77,7 71,3 86,1
1802A 54,8 58,6 72,4 78,8 84,5 75,9 70,4 57,8 86,3
2202A 55,7 59,4 77,2 78,5 84,3 77,2 71,6 65,3 86,7
2502A 55,6 59,0 75,5 78,6 83,3 77,1 71,7 65,4 85,9
2802A 55,6 57,3 74,0 78,7 83,2 81,1 73,8 65,8 86,7
3212A 59,3 66,3 77,5 81,7 86,6 81,2 76,5 69,4 89,3
3612A 59,2 64,5 79,0 82,4 86,2 81,5 75,9 69,4 89,4
4212A 60,0 64,0 82,1 83,9 86,1 82,7 76,1 70,1 90,2
4812A 60,0 64,3 80,9 83,3 87,7 82,7 76,7 70,2 90,7

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BREC – BREF
Air cooled chillers and free-cooling chillers

Main Electrical Data

Good practices and recommendations for electrical design

The correct design for the electrical section depends on many factors, partially covered by the unit data, which
must be considered and matched.
In particular protection sizing depends on cable size and lengths, as well as local standards.

Main electrical data provided for the units are Full Load Amperage, Full Load Input power and Locked Rotor
Amperage. Those values are necessary for designing the site electrical circuit/s as per the explanation below,
while Operative values for Current and Power are not to be used for sizing cabling, safety devices and other
devices since different values may happen according to the different operating conditions.

Electrical data for components

 ST: it is the starting mode for compressors. It can be Part-Winding (PW) or Star/Delta(Y/∆) according to the
model (see below the specific note)
 FLA: Full Load Amperage. These are the absorbed current values of components [A] at max operating
parameters over an extended period of time
 FLI: Full Load Input Power. These are the absorbed power values of components [kW] at max operating
parameters over an extended period of time
 LRA: Locked Rotor Amperage. This is the max current peak of components [A]. Regarding the LRA for
compressors refer to the note below.

Electrical data for the unit

 Voltage: The power supply for all of the units is 400V / 3ph / 50Hz, with tolerance in voltage of 380V-5% and
420+5%. Therefore the min voltage is 360V while the max is 440V, the unit is self-protected in voltage
conditions which are out of this limits and it is automatically switched off by means of the min/max voltage
relay. Versions with different power supplies (voltage and/or frequencies) can be provided on request
 SB: Stand-by current: this is the current absorption [A] of the auxiliaries devices. When the unit is in stand-by
mode it refers to current absorption without compressors, fans and pump (if fitted) operating
 OA: Operative Amperage. This is the absorbed current calculated by simulation software at a specific
operative conditions over an extended period of time, i.e. compressor/s specific operative absorbed current +
specific operative fans absorbed current + specific operative main pump absorbed current (if present, typically
considered separately in the simulation software datasheets). This is the operative steady current value at
specific conditions. Since, according to the different operating conditions, different current values may happen,
this value is NOT to be used for sizing cabling, safety devices, etc.
 OP: Operative Power input. This is the absorbed power calculated by simulation software at a specific
operative conditions over an extended period of time, i.e. compressor/s specific operative absorbed power +
specific operative fans absorbed power + specific operative main pump absorbed power (if present, typically
considered separately in the simulation software datasheets). This is the operative steady power value at
specific conditions. Since, according to the different operating conditions, different power values may happen,
this value is NOT to be used for sizing cabling, safety devices, etc.
 FLA: Full Load Amperage, the maximum absorbed current of the unit [A]. This is the absorbed current of the
unit at max operating parameters over an extended period of time, i.e. compressor/s max absorbed current +
max fans absorbed current + max main pump absorbed current (if present) + the auxiliaries devices current
(SB). This is the maximum steady current value actually necessary to size cabling, safety devices, etc.
Data for units fitted with power phase capacitors refer to the worst case, i.e. without power phase capacitors
active.
 FLI: Full Load Input Power, the maximum absorbed power of the unit [kW]. This is the absorbed power at max
operating parameters over an extended period of time, i.e. compressor/s max absorbed power + fans

55 Aquaflair Chillers Technical Specifications 990-5091-001

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 absorbed power + max main pump absorbed power (if present). This is the maximum steady power value
actually necessary to size cabling, safety devices, etc. In combination with the FLA value.
 LRA: Locked Rotor Amperage, the maximum absorbed pick in current of the unit [A]. This is the max current
peak of the unit, i.e. compressor nr 1 locked rotor amperage + other compressor/s max absorbed current +
max fans absorbed current + max operating current for pump (if fitted) + the auxiliaries devices current (SB).
This is necessary to define the delay in external safety devices and the genset sizing (if fitted).
Data for units fitted with power phase capacitors refer to the worst case, i.e. without power phase capacitors
active.
NOTE on LRA values
The star/delta transition increases the absorbed current value for an instantaneous timeframe. This peak can
be calculated as: compressor nr 1 LRA (∆) + the max compressor nr 2 absorbed current (FLA) + the fans
absorbed current (and pump if fitted) + the auxiliaries devices current (SB). This transition is usually shorter
than the protection tripping min time and therefore it is possible to evaluate if not considering in the protection
design (at designer responsibility).
 COSφ: it is the cosine of the φ angle of displacement between the current and the voltage in an electrical
system with alternate current.
Values in the table below are provided at nominal conditions, i.e. Inlet/Outlet water temperature: 12/7°C,
2
Ambient temperature: 35°C, glycol: 0%, fouling factor: 0 m °C/kW and full load conditions
NOTE on COSφ values
• Cosphi at different load conditions
Standard power phase capacitors (fixed) cannot maintain a value in every condition. As the capacity for
standard power phase capacitors is fixed, they cannot adapt to the load and the cosphi cannot be the
same in all conditions.
• Power phase capacitors on chillers with screw compressors
Regarding power phase capacitors on chillers with screw compressors it is very important to underline the
following points. It is not possible to use power phase capacitors for the fans, as they are connected to a
phase cutting regulator; consequently the only way to achieve a cosphi target value for the entire unit is to
apply a higher value to the compressors (for instance to achieve 0.90, it is necessary to use 0.92 on the
compressors).
Regarding 0.95, this is the max acceptable cosphi value for screw compressors. It is absolutely not
permitted to have a value higher than 0.95, this means that it is not possible to grant 0.95 for the entire
unit, but only a value close to and below 0.95. The gap depends on the size of the unit which can fall
within the measurement tolerances.
• Cosphi on units equipped with fans with EC motors
Electronically commuted (EC) motors, which are applied on EC fans, do not have the same effect as
asynchronous motors with relation to the phase displacement between current and voltage.
These types of motors do not introduce a phase displacement, but modify the shape of the wave as a
phase displacement. However this effect is different and it cannot be corrected with the traditional power
phase capacitors.

Compressor starting procedures

According to the compressor model/type, the starting mode on BREC/F units can be the following.
 Part-winding, for BREC/F1612A-2812A (indicated as “PW” in the tables below)
 Star delta, for BREC/F1602A-2802A and BREC/F3212A-4812A (indicated as “Y/∆” in the tables below)

Part-winding
Part-winding: on motors with this system the windings of the motor are divided in two sections and therefore
these motors are powered in 2 steps, 60% of the windings first, then 100%. A typical amperage profile for this
configuration is shown in the following image.
NOTE: The intent of the picture is descriptive only, values for amperage and timing may change a lot according
to the compressor size, model or manufacturer)

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Is this case the starting current for a compressor is slightly higher than the LRA, which is measured according to
relative standards, i.e. Tout at 32°C, with rotor locked, and 4 seconds after the compressor has been powered
and therefore these values could be slightly different in different conditions.
NOTE: All the values in the datasheets refer to RMS (root mean square) value.
In the following tables this value is identified with the “D”, while with “DD” is usually identified the Direct On Line
starting method (DOL), usually not applied on screw compressors.

Star-Delta
The motor is started in 2 configurations, star and then delta: The first one in a Star layout, the second one in a
Delta layout. A typical amperage profile for this configuration is shown in the following picture.
NOTE: The intent of the picture is descriptive only, values for amperage and timing may change a lot according to
the compressor size, model or manufacturer).

57 Aquaflair Chillers Technical Specifications 990-5091-001

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The first peak is typically lower (in current) and longer (in time) than the second one which is higher and very
short.
This is the reason why the star value is usually considered for sizing and design, while the delta value is
necessary for a double check. Moreover, this is the reason why declared data refer to star mode.
In the following tables the star value is identified with the “Y”, while with delta with “∆”.

Since it is really short, the Delta (∆) peak is practically transparent from a current absorption prospective, but it
could influence the operation of some critical devices, as for example generators, and it should be consequently
considered in the general electrical design (at designer responsibility).

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Electrical data for components
BREC units – chiller series

Compressor (Basic version) Compressor (High temperature version)

Nr FLI FLA LRA ST Nr FLI FLA LRA ST
1602A 2 78 128 177 (Y) / 563 (∆) Y/∆ 2 78 128 177 (Y) / 563 (∆) Y/∆
1802A 2 103 165 224 (Y) / 717 (∆) Y/∆ 2 103 165 224 (Y) / 717 (∆) Y/∆
2202A 2 114 183 279 (Y) / 888 (∆) Y/∆ 2 114 183 279 (Y) / 888 (∆) Y/∆
2502A 2 122 207 279 (Y) / 888 (∆) Y/∆ 2 122 207 279 (Y) / 888 (∆) Y/∆
2802A 2 146 243 276 (Y) / 861 (∆) Y/∆ 2 146 243 276 (Y) / 861 (∆) Y/∆
1612A 2 88 144 350 (D) / 585 (DD) PW 2 102 170 479 (D) / 790 (DD) PW
1812A 2 96 162 423 (D) / 686 (DD) PW 2 112 180 516 (D) / 887 (DD) PW
2212A 2 110 182 520 (D) / 801 (DD) PW 2 150 246 665 (D) / 1023 (DD) PW
2512A 2 120 196 612 (D) / 943 (DD) PW 2 160 260 729 (D) / 1114 (DD) PW
2812A 2 131 214 665 (D) / 1023 (DD) PW 2 186 310 757 (D) / 1181 (DD) PW
3212A 2 155 280 436 (Y) / 1364 (∆) Y/∆ 2 246 370 586 (Y) / 1853 (∆) Y/∆
3612A 2 175 310 465 (Y) / 1442 (∆) Y/∆ 2 255 420 650 (Y) / 2029 (∆) Y/∆
4212A 2 204 320 586 (Y) / 1853 (∆) Y/∆ 2 280 450 805 (Y) / 2520 (∆) Y/∆
4812A 2 222 360 650 (Y) / 2029 (∆) Y/∆ 2 280 450 805 (Y) / 2520 (∆) Y/∆

Standard Fan EC fan

Nr FLI FLA Nr FLI FLA
1602A 6 1,9 3,9 6 2,86 4,5
1802A 6 1,9 3,9 6 2,86 4,5
2202A 8 1,9 3,9 8 2,86 4,5
2502A 8 1,9 3,9 8 2,86 4,5
2802A 8 1,9 3,9 8 2,86 4,5
1612A 6 1,9 3,9 6 2,86 4,5
1812A 6 1,9 3,9 6 2,86 4,5
2212A 8 1,9 3,9 8 2,86 4,5
2512A 8 1,9 3,9 8 2,86 4,5
2812A 8 1,9 3,9 8 2,86 4,5
3212A 10 1,9 3,9 10 2,86 4,5
3612A 10 1,9 3,9 10 2,86 4,5
4212A 12 1,9 3,9 12 2,86 4,5
4812A 12 1,9 3,9 12 2,86 4,5

Main Pump
FLI FLA LRA
1602A 9,2 18,5 152
1802A 9,2 18,5 152
2202A 11,0 21,5 183
2502A 11,0 21,5 183
2802A 11,0 21,5 183
1612A 9,2 18,5 152
1812A 9,2 18,5 152
2212A 11,0 21,5 183
2512A 11,0 21,5 183
2812A 11,0 21,5 183
3212A 11,0 21,5 183
3612A 11,0 21,5 183
4212A 22,0 41,0 439
4812A 22,0 41,0 439

59 Aquaflair Chillers Technical Specifications 990-5091-001

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Electrical data for components
BREF units – free-cooling chiller series

Compressor (Basic version) Compressor (High temperature version)

Nr FLI FLA LRA ST Nr FLI FLA LRA ST
1602A 2 78 128 177 (Y) / 563 (∆) Y/∆ 2 78 128 177 (Y) / 563 (∆) Y/∆
1802A 2 103 165 224 (Y) / 717 (∆) Y/∆ 2 103 165 224 (Y) / 717 (∆) Y/∆
2202A 2 114 183 279 (Y) / 888 (∆) Y/∆ 2 114 183 279 (Y) / 888 (∆) Y/∆
2502A 2 122 207 279 (Y) / 888 (∆) Y/∆ 2 122 207 279 (Y) / 888 (∆) Y/∆
2802A 2 146 243 276 (Y) / 861 (∆) Y/∆ 2 146 243 276 (Y) / 861 (∆) Y/∆
1612A 2 88 144 350 (D) / 585 (DD) PW 2 102 170 479 (D) / 790 (DD) PW
1812A 2 96 162 423 (D) / 686 (DD) PW 2 112 180 516 (D) / 887 (DD) PW
2212A 2 110 182 520 (D) / 801 (DD) PW 2 150 246 665 (D) / 1023 (DD) PW
2512A 2 120 196 612 (D) / 943 (DD) PW 2 160 260 729 (D) / 1114 (DD) PW
2812A 2 131 214 665 (D) / 1023 (DD) PW 2 186 310 757 (D) / 1181 (DD) PW
3212A 2 155 280 436 (Y) / 1364 (∆) Y/∆ 2 246 370 586 (Y) / 1853 (∆) Y/∆
3612A 2 175 310 465 (Y) / 1442 (∆) Y/∆ 2 255 420 650 (Y) / 2029 (∆) Y/∆
4212A 2 204 320 586 (Y) / 1853 (∆) Y/∆ 2 280 450 805 (Y) / 2520 (∆) Y/∆
4812A 2 222 360 650 (Y) / 2029 (∆) Y/∆ 2 280 450 805 (Y) / 2520 (∆) Y/∆

Standard Fan EC fan

Nr FLI FLA Nr FLI FLA
1602A 6 1,9 3,9 6 2,86 4,5
1802A 6 1,9 3,9 6 2,86 4,5
2202A 8 1,9 3,9 8 2,86 4,5
2502A 8 1,9 3,9 8 2,86 4,5
2802A 8 1,9 3,9 8 2,86 4,5
1612A 6 1,9 3,9 6 2,86 4,5
1812A 6 1,9 3,9 6 2,86 4,5
2212A 8 1,9 3,9 8 2,86 4,5
2512A 8 1,9 3,9 8 2,86 4,5
2812A 8 1,9 3,9 8 2,86 4,5
3212A 10 1,9 3,9 10 2,86 4,5
3612A 10 1,9 3,9 10 2,86 4,5
4212A 12 1,9 3,9 12 2,86 4,5
4812A 12 1,9 3,9 12 2,86 4,5

Main pump Free-cooling pump

FLI FLA LRA FLI FLA LRA
1602A 10,9 18,5 152 8,5 14,3 130
1802A 10,9 18,5 152 8,5 14,3 130
2202A 12,6 21,5 183 10,9 18,5 152
2502A 12,6 21,5 183 10,9 18,5 152
2802A 12,6 21,5 183 10,9 18,5 152
1612A 10,9 18,5 152 8,5 14,3 130
1812A 10,9 18,5 152 8,5 14,3 130
2212A 12,6 21,5 183 10,9 18,5 152
2512A 12,6 21,5 183 10,9 18,5 152
2812A 12,6 21,5 183 10,9 18,5 152
3212A 12,6 21,5 183 12,6 21,5 183
3612A 12,6 21,5 183 12,6 21,5 183
4212A 25,2 41,0 439 21 34 320
4812A 25,2 41,0 439 21 34 320

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Electrical Data for complete unit
BREC/F units – units without pumps and with EC fans

Units without power phase capacitors

COSφ at nominal conditions
FLI FLA LRA SB
EC fans AC fans
1602A 175 289 338 0,87 0,85 5,8
1802A 225 363 422 0,87 0,85 5,8
2202A 253 408 504 0,86 0,84 5,8
2502A 269 456 528 0,87 0,85 5,8
2802A 317 528 561 0,86 0,84 5,8
1612A 195 321 527 0,85 0,82 5,8
1812A 211 357 618 0,87 0,85 5,8
2212A 245 406 744 0,86 0,83 5,8
2512A 265 434 850 0,85 0,83 5,8
2812A 287 470 921 0,85 0,83 5,8
3212A 341 611 767 0,88 0,86 5,8
3612A 381 671 826 0,89 0,87 5,8
4212A 445 700 966 0,87 0,85 5,8
4812A 481 780 1070 0,88 0,86 5,8

Units with power phase capacitors

COSφ at nominal conditions
FLI FLA LRA SB
EC fans AC fans
1602A 175 289 338 0,92 0,89 5,8
1802A 225 363 422 0,91 0,89 5,8
2202A 253 408 504 0,90 0,87 5,8
2502A 269 456 528 0,92 0,89 5,8
2802A 317 528 561 0,90 0,88 5,8
1612A 195 321 527 0,94 0,91 5,8
1812A 211 357 618 0,93 0,91 5,8
2212A 245 406 744 0,92 0,90 5,8
2512A 265 434 850 0,92 0,90 5,8
2812A 287 470 921 0,92 0,90 5,8
3212A 341 611 767 0,93 0,91 5,8
3612A 381 671 826 0,94 0,92 5,8
4212A 445 700 966 0,92 0,90 5,8
4812A 481 780 1070 0,92 0,91 5,8

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Electrical data for complete unit
BREC/F units – units with high ambient temperature option, with EC fans, and without pumps

Units without power phase capacitors

COSφ at nominal conditions
FLI FLA LRA SB
EC fans AC fans
1602A 175 289 338 0,87 0,85 5,8
1802A 225 363 422 0,87 0,85 5,8
2202A 253 408 504 0,86 0,84 5,8
2502A 269 456 528 0,87 0,85 5,8
2802A 317 528 561 0,86 0,84 5,8
1612A 223 373 682 0,85 0,83 5,8
1812A 243 393 729 0,85 0,82 5,8
2212A 325 534 953 0,83 0,80 5,8
2512A 345 562 1031 0,85 0,83 5,8
2812A 397 662 1109 0,80 0,78 5,8
3212A 523 791 1007 0,84 0,82 5,8
3612A 541 891 1121 0,85 0,83 5,8
4212A 597 960 1315 0,85 0,83 5,8
4812A 597 960 1315 0,86 0,85 5,8

Units with power phase capacitors

COSφ at nominal conditions
FLI FLA LRA SB
EC fans AC fans
1602A 175 289 338 0,92 0,89 5,8
1802A 225 363 422 0,91 0,89 5,8
2202A 253 408 504 0,90 0,87 5,8
2502A 269 456 528 0,92 0,89 5,8
2802A 317 528 561 0,90 0,88 5,8
1612A 223 373 682 0,94 0,91 5,8
1812A 243 393 729 0,91 0,89 5,8
2212A 325 534 953 0,90 0,87 5,8
2512A 345 562 1031 0,93 0,90 5,8
2812A 397 662 1109 0,87 0,85 5,8
3212A 523 791 1007 0,90 0,88 5,8
3612A 541 891 1121 0,90 0,88 5,8
4212A 597 960 1315 0,91 0,88 5,8
4812A 597 960 1315 0,91 0,89 5,8

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Electrical data for complete unit
BREC/F units – units with onboard pumps and EC fans

Units without power phase capacitors

COSφ at nominal conditions
FLI FLA LRA SB
EC fans AC fans
1602A 186 307 356 0,87 0,85 5,8
1802A 236 381 440 0,87 0,85 5,8
2202A 266 429 525 0,86 0,84 5,8
2502A 282 477 549 0,87 0,85 5,8
2802A 330 549 582 0,86 0,84 5,8
1612A 206 339 545 0,85 0,82 5,8
1812A 222 375 636 0,87 0,85 5,8
2212A 258 427 765 0,86 0,83 5,8
2512A 278 455 871 0,85 0,83 5,8
2812A 300 491 942 0,85 0,84 5,8
3212A 353 632 788 0,88 0,86 5,8
3612A 393 692 847 0,89 0,87 5,8
4212A 470 741 1007 0,87 0,85 5,8
4812A 506 821 1111 0,88 0,86 5,8

Units with power phase capacitors

COSφ at nominal conditions
FLI FLA LRA SB
EC fans AC fans
1602A 186 307 356 0,92 0,90 5,8
1802A 236 381 440 0,91 0,89 5,8
2202A 266 429 525 0,90 0,88 5,8
2502A 282 477 549 0,92 0,89 5,8
2802A 330 549 582 0,90 0,89 5,8
1612A 206 339 545 0,94 0,91 5,8
1812A 222 375 636 0,93 0,91 5,8
2212A 258 427 765 0,92 0,90 5,8
2512A 278 455 871 0,93 0,90 5,8
2812A 300 491 942 0,92 0,90 5,8
3212A 353 632 788 0,93 0,91 5,8
3612A 393 692 847 0,94 0,92 5,8
4212A 470 741 1007 0,92 0,91 5,8
4812A 506 821 1111 0,92 0,91 5,8

63 Aquaflair Chillers Technical Specifications 990-5091-001

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Electrical Data for complete unit
BREC/F units – units with high ambient temperature, EC fans, and onboard pumps

Units without power phase capacitors

COSφ at nominal conditions
FLI FLA LRA SB
EC fans AC fans
1602A 186 307 356 0,87 0,85 5,8
1802A 236 381 440 0,87 0,85 5,8
2202A 266 429 525 0,86 0,84 5,8
2502A 282 477 549 0,87 0,85 5,8
2802A 330 549 582 0,86 0,84 5,8
1612A 234 391 700 0,85 0,83 5,8
1812A 254 411 747 0,85 0,83 5,8
2212A 338 555 974 0,83 0,81 5,8
2512A 358 583 1052 0,85 0,83 5,8
2812A 410 683 1130 0,80 0,78 5,8
3212A 535 812 1028 0,84 0,82 5,8
3612A 553 912 1142 0,85 0,83 5,8
4212A 622 1001 1356 0,85 0,83 5,8
4812A 622 1001 1356 0,86 0,85 5,8

Units with power phase capacitors

COSφ at nominal conditions
FLI FLA LRA SB
EC fans AC fans
1602A 186 307 356 0,92 0,89 5,8
1802A 236 381 440 0,91 0,89 5,8
2202A 266 429 525 0,90 0,87 5,8
2502A 282 477 549 0,92 0,89 5,8
2802A 330 549 582 0,90 0,88 5,8
1612A 234 391 700 0,94 0,91 5,8
1812A 254 411 747 0,91 0,89 5,8
2212A 338 555 974 0,90 0,87 5,8
2512A 358 583 1052 0,93 0,90 5,8
2812A 410 683 1130 0,88 0,86 5,8
3212A 535 812 1028 0,90 0,88 5,8
3612A 553 912 1142 0,91 0,89 5,8
4212A 622 1001 1356 0,91 0,89 5,8
4812A 622 1001 1356 0,91 0,90 5,8

990-5091-001 Aquaflair Chillers Technical Specifications 64

06ME031@00B0150
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