UNICO TURBO FL FREE...... R134a ..... 358 ÷ 1548 kW

MAIN FEATURES
Air cooled liquid chiller with free-cooling system in A class energy
efficiency.
15 models available, for a wide selection opportunity.
Average step of 100kW.
EER up to 3,60.
ESEER up to 5,76.
Oil-free centrifugal compressors with magnetic levitation bearings driven by built-in inverter.
R134a Refrigerant charge.
Single refrigerant circuit.
AC Axial fans.
Flooded evaporator.
Microchannel condensing coils in aluminium.
Electronic expansion valve.
Single air circuit.
Modular construction.
Suitable for outdoor installation.
 

INDIRECT FREE COOLING SYSTEM: Complete cooling of the chilled water of the existing cooling system with the outside air. The energy saving will be higher the longer the outside temperature remains below the required temperature for cooling.

A CLASS ENERGY EFFICIENCY: The best and most accurate components applied to the chillers.

WORKING LIMITS IN COOLING MODE
Chilled water outlet temperature: -10÷15°C
Ambient temperature: -10÷43°C

WORKING LIMITS IN FREE-COOLING MODE
Minimum chilled water outlet temperature: -15°C
Minimum ambient temperature: -20°C
 

MAIN BENEFITS
Up to four centrifugal compressors with magnetic levitation bearings on the refrigerant circuit for an high efficiency.
No need of power factor correction.
Minimum starting current (LRA)
Low refrigerant charge.
Very high EER and ESEER. A Class energy efficiency.
Quiet operation.
Availability of kit for further reduction of the noise.
Availability of EC fans for a higher efficiency.
Microprocessor control system with 7” touch screen display.
Extremely easily of maintenance.
Complete set of components dedicated to the safety of the unity.
 

COMPONENTS
FRAMEWORK
Base, self supporting frame and paneling in steel plate with protective surfaces treatment in compliance with UNI ISO 9227/ASTMB117 and ISO 7253, and painted with epoxy powders.
Colour: RAL 9002 textured.

COMPRESSORS
Twin-turbine centrifugal compressor, oil-free type, optimized for R134a refrigerant. The term “oil-free” refers to the total absence of lubricating oil within the compressor
Magnetic levitation bearings.
Manometric compression ratio: 1.5 ÷ 5.0
Stepless capacity control trough integrated inverter.
High efficiency permanent-magnet synchronous motor with integrated Soft- Start system (starting current limited to 5A).
Power factor motor cosφ > 0.9 for a large part of the operating range
Motor and electronic power section cooling by liquid refrigerant injection into the integrated cooling circuit.
Electric motor thermal protection via internal winding temperature sensors.
Electronic integrated control for operation and alarms status.
Sensor on refrigerant discharge for temperature monitoring.
Inner sensors for electronic components and inverter temperature control.
Security system to protect the crankshaft and magnetic bearings in the event of failure of power supply.
Installation with walls sound attenuators
Degree of protection: IP54.
Electric resistance of the suction pipe, together with activated antifreeze evaporator, to prevent the migration of refrigerant inside the compressor.

EVAPORATOR
Flooded shell and tube evaporator, optimized for R134a refrigerant.
Version two passes, characterized by low pressure losses on the water side.
Water tubes with a helical rifled internal surface.
Integrated liquid drop separator.
Shell, header, tube sheets made of carbon steel, tubes in Cu.
Anticondensate insulation made of polyurethane.
Temperature sensors on water inlet and outlet.
Water flow switch for water flow control.
Large liquid level indicator
Antifreeze heater.

CONDENSING COIL
Microchannel condensing coil in aluminium.
Single row
Low air side pressure drop
High efficiency of heat exchange.
Special protective surface treatment - acrylic painting TK-PRO that achieves a high resistance to atmospheric agents, while maintaining the same conditions of heat exchange capacity. (contact the Commercial RC GROUP).
Reduced internal volume capable of containing the total refrigerant charge.
High performance also in low noise structure,in combination of the fans listed below.
Frame in galvanized steel.

FREE-COOLING COIL
Heat exchanger coil with copper tubes and high efficiency aluminium fins, specifically developed to provide high heat transfer and lower pressure drops. The combination of two factors, special tubes and fins, allow to optimally combine the following aspects:
Maximum capacity relative to the size of the exchanger.
Reduction of the air flow required for the heat exchange.
Frame in galvanized steel.
Motorized valves for free-cooling water circuit control.
Temperature sensor on ambient air.
 
FANS SECTION
Axial fans with sickle-shaped blades, fan guard and optimized for low noise levels.
External rotor AC type electric motor with stepless variable speed for condensing pressure control.
IP54 enclosure class.

REFRIGERANT CIRCUIT
Components for each refrigerant circuit:
Electronic expansion valve that allows high performance and system efficiency thanks to a timely and accurate response to changes in temperature and pressure.
valve by-pass for start-up.
Electronic by-pass valve for compressor start.
Non return valve on by-pass line for compressor start.
Economizer for model 560 T2E, 810 T2E, 1070 T4E, 1120 T4E, 1200 T3E,
1500 T4E.
The system includes:
Copper brazed plate type with cover plates, plates and connections in AISI 316 stainless steel.
Anticondensate insulation made of polyurethane.
Intermediate electronic expansion valve.
Sight glass.
Filter dryer on liquid line.
Service valve on liquid line.
Service valve on gas discharge.
Non return valve on gas discharge.
Safety valve on low pressure side.
Safety valve on high pressure side.
Pressure transducers with indication, control and protection functions, on low and high refrigerant pressure.
High pressure safety switch with manual reset.
Refrigerant circuit with copper tubing with anticondensate insulation of the suction line.
Plastic capillary hoses for pressure sensors connection and cooling line of
the compressor
R134a refrigerant charge.

ELECTRICAL PANEL
In accordance with EN60204-1 norms, suitable for outdoor installation, complete with:
Main switch with door lock safety.
Fuses for each compressor.
Magnetothermic switches for fans or water pumps (if scheduled).
Contactors for each load.
Transformer for auxiliary circuit and microprocessor supply.
Panel with machine controls.
Power supply 400/3/50.

CONTROL SYSTEM
Microprocessor system with “Touch Screen” graphic display for control and monitor of operating and alarms status. The system includes:
Voltage free contact for remote general alarm.
Main components hour-meter.
Integrated “Data logger” function for the recording of events and alarms.
Nonvolatile “Flash” memory for data storage.
Menu with protection password.

HYDRAULIC CONNECTIONS OF HEAT EXCHANGERS
The heat exchangers’ threaded hydraulic connections are available up to a diameter of 3 “ included, and correspond to ISO 228/1 – G M.
The pipes’ threaded hydraulic connections are available up to a diameter of 3 “ included, and correspond to ISO 7/1 – R.
The hydraulic connections with flange (FL) are supplied as standard with counter flange.
The hydraulic connections with grooved end are supplied as standard with flexible joint and adapter pipe.