TWA/FC 251÷1501 TT/Y


_ktk_icon_versions_cooling_only.png _ktk_icon_compressor_turbocor.png _ktk_icon_axial_fan.png _ktk_icon_flooded_shell_and_tube.png _ktk_icon_free_cooling.png _ktk_icon_gsm.png _ktk_icon_refrigerant_R134a.png ktk_icon_refrigerant_R513A.png

The innovative TWA/FC 251÷1501 TT/Y units, with R134a refrigerant and FREE-COOLING technology, are designed to provide an effective solution to installation requirements of large areas, both commercial and industrial, where the production of chilled water is required in continuous service throughout the year. The unit, designed with specific attention to every aspect of construction and combined with the use of TURBOCOR dynamic partialization oil-free magnetic levitation compressors - managed by the TURBOSOFT self-adaptive electronic control - and with the use of flooded shell and tube evaporator, achieves a high rate of energy efficiency, with unequaled SEPR values, with minimum water content, and an excellent silent functioning. Depending on outside air temperature, the microprocessor controller manages the functioning in CHILLER, FREE-COOLING or MIXED (both CHILLER and FREE-COOLING) mode.
Are available as option the new EC Inverter fans with high available static pressure and efficiency.
The units are compliant to the 2021 ErP Regulation for process cooling application.
On request, units can be supplied with R513A refrigerant.


  • TWA/FC - Cooling only

Power range

  • 246-1443 kW
  • 70.0-410 Ton


  • Structure with supporting frame, made of galvanised sheet metal with additional protection provided by polyester powder coating.
  • Semi-hermetic centrifugal compressors with dual Turbocor turbine, oil free, magnetic rising rotor, thermal protection, continuous capacity adjustment system thanks to built-in INVERTER, automatic anti-cavitation system. The power circuit of the compressor is fitted with a set of electrolytic condensers to control the rising in the event of a power failure, reactor for the power factor correction, EMI filter for electromagnetic compatibility.
  • Axial fans directly coupled to an electric motor with external rotor.
  • Condenser made of copper tubes and aluminium finned coils combined with FREE-COOLING coils.
  • High efficiency flooded shell and tube type evaporator, with one or two independent circuits on the refrigerant side and one on the water side, complete with water differential pressure switch.
  • Cooling circuit shut-off valves on suction, discharge and liquid line.
  • Electronic expansion valve.
  • Electronic high and low pressure gauges.
  • R134a refrigerant. On request R513A refrigerant.
  • Electrical board includes: main on-off switch with door lock, fuses, electronic/digital overload device to protect the compressors and thermocontacts for fans, interface relay and terminals for external connections.
  • Condensing Control is included: electronic proportional device that ensures efficient and continuous functioning of the unit with outside air temperature down to –20 °C. It also allows to reduce the sound level especially at night. It consists of a fans speed controller with continuous speed regulation, high and low pressure transducers on cooling circuit and an electrical heater on electrical board.
  • TURBOSOFT control and regulation system, equipped with RS485 serial interface, can be supplied with an optional Web Monitoring device for remote monitoring via GPRS/EDGE/3G/TCP-IP network.

Factory fitted accessories

  • IM Automatic circuit breakers
  • EC EC Inverter fans
  • ECH EC Inverter fans with high available static pressure
  • TX Coil with pre-coated fins
  • PU Single circulating pump
  • PD Double circulating pump
  • TS Touch Screen Interface
  • WM Web Monitoring - Wireless remote monitoring (GPRS/EDGE/3G/TCP-IP)
  • IST Modbus TCP/IP protocol, Ethernet port
  • ISB BACnet MSTP protocol, RS485 serial interface
  • ISBT BACnet IP protocol, Ethernet port
  • ISL LonWorks protocol, FTT-10 serial interface
  • ISS SNMP protocol, Ethernet port
  • IAV Remote set-point, 0-10 V signal
  • IAA Remote set-point, 4-20 mA signal
  • IAS Remote signal for second set-point activation
  • IDL Demand limit from digital input
  • CP Potential free contacts

Loose accessories

  • MN High and low pressure gauges
  • CR Remote control panel
  • RP Coils protection metallic guards
  • AG Rubber shock absorbers
  • AM Spring shock absorbers
  • FL Flow switch
CoolingCooling capacity (1)kW246281333400588696869104612291443495
Absorbed power (1)kW718094116171204257307357425143
EER (1)3,463,513,543,453,443,413,383,413,443,403,46
Cooling (EN14511)Cooling capacity (1)kW244279331397582690861103312111421491
Absorbed power (1)kW738296119177210265321375447147
EER (1)3,343,403,453,343,293,293,253,223,233,183,34
SEPR (2)7,297,387,077,027,197,047,237,047,237,227,40
Free-Cooling cycleAir temperature (3)°C-2,50,5-2,90,0-2,3-0,5-0,21,01,01,0-2,8
Absorbed power (3)kW10,810,810,814,421,621,625,232,436,036,018,0
Refrigerant circuits11111111111
Capacity stepsSteplessSteplessSteplessSteplessSteplessSteplessSteplessSteplessSteplessSteplessStepless
Water circuit.Water flowl/s12,6914,5017,1820,6430,3435,9144,8453,9763,4274,4625,54
Pressure dropskPa929788105155125144220256275115
Water connectionsDN100100100125150150150150200200125
Electrical characteristicsPower supplyV/Ph/Hz400/3/50400/3/50400/3/50400/3/50400/3/50400/3/50400/3/50400/3/50400/3/50400/3/50400/3/50
Max. running currentA1681681682623375095177636581002329
Max. starting currentA25252533194280288534515773186
Unit with pumpPump available static pressurekPa135125115110140155105160205145150
Water connectionsDN100100100125150150150150200200125
Sound pressureSTD version (4)dB(A)6868696970706970707069
WeightsTransport weightkg3040320036003700515055007700880010000103004620
Operating weightkg3180336038103930540058108080925010480107904850




  • 1 Chilled water (with ethylene glycol at 30%) from 15 to 10 °C, ambient air temperature 35 °C.
  • 2 Seasonal energy efficiency of high temperature process cooling according to EU Regulation No. 2016/2281.
  • 3 Ambient air temperature at wich the cooling capacity indicated in point (1) is reached.
  • 4 Sound pressure level measured in free field conditions at 1 m from the unit. According to ISO 3744.