TWA 251÷1501 TT/Y

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TWA 251÷1501 TT/Y

TWA 251÷1501 TT/Y

High efficiency air cooled liquid chillers with axial fans, TURBOCOR (magnetic levitation) compressors and flooded shell and tube exchanger

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The innovative TWA 251÷1501 TT/Y units, with R134a refrigerant, are designed to provide an effective solution to highly selective system needs. Efficiency at partial loads, low inrush currents, an excellent silent functioning, reduced weight and the specific design and handling of every manufacturing aspect make the series the top unit of the range.
The use of TURBOCOR dynamic partial-load oil-free magnetic levitation compressors managed by the TURBOSOFT self-adaptive electronic control, of flooded shell and tube evaporator and innovative heat exchangers, traditional or Microchannel, results in a high energy efficiency with unequaled SEER values, with minimum water content, and an excellent silent functioning. Compared to traditional units, equipped with Screw compressors, TURBOLINE units have low operational costs during their entire operating period, even lower than 50%.
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.
On request, units can be supplied with R513A refrigerant.

Versions

  • TWA - Cooling only
  • TWA/MC - Cooling only with MICROCHANNEL condensing coils

Power range

  • 248-1456 kW
  • 71.0-414 Ton

Features

  • 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 tube and aluminum finned coils or aluminium MICROCHANNEL coils.
  • High efficiency flooded shell and tube type evaporator, with one independent circuit 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
  • RE Adjustable minimum/maximum voltage and phase control relay
  • EC EC Inverter fans
  • ECH EC Inverter fans with high available static pressure
  • TX Coil with pre-coated fins
  • TXB Coil with epoxy treatment
  • EW External water connections
  • PU Single circulating pump
  • PD Double circulating pump
  • GS Single circulating pump gasket for glycol >30%
  • GD Double circulating pump gaskets for glycol >30%
  • FE Antifreeze heater for evaporator
  • FX Antifreeze heater for evaporator and pipes
  • FZ Antifreeze heater for evaporator, single pump and pipes
  • FH Antifreeze heater for evaporator, double pump and pipes
  • TS Touch Screen Interface
  • WM Web Monitoring - Wireless remote monitoring (GPRS/EDGE/4G/TCP-IP)
  • IST Modbus TCP/IP protocol, Ethernet port
  • ISB BACnet MSTP protocol, RS485 serial interface
  • ISBT BACnet IP protocol, Ethernet port
  • ISS SNMP protocol, Ethernet port
  • IAV Remote set-point, 0-10V signal
  • IAA Remote set-point, 4-20mA signal
  • IAS Remote signal for second set-point activation
  • IDL Demand limit from digital input
  • CP Potential free contacts
  • MN High and low pressure gauges

Loose accessories

  • CR Remote control panel
  • RP Coils protection metallic guards
  • FP Coils protection metallic guards with filter
  • AG Rubber shock absorbers
  • AM Spring shock absorbers
  • FL Flow switch
251291341411521641801981110112911501
Cooling STD versionCooling capacity (1)kW248282335403509627770929107512601456
Absorbed power (1)kW738197116145185221274311362433
EER (1)3,403,483,453,473,513,393,483,393,463,483,36
Cooling STD version (EN14511)Cooling capacity (1)kW247281334402507624767925107212561450
Absorbed power (1)kW748298117147188224278315366439
EER (1)3,323,433,403,423,463,333,433,323,413,433,31
SEER (2)4,885,065,075,185,145,165,345,295,365,405,25
Energy Efficiency (2)%192199200204203203211209211213207
Cooling MC versionCooling capacity (1)kW248282335403509627770929107512601456
Absorbed power (1)kW647386106132163198243281328381
EER (1)3,883,863,903,803,863,853,893,823,833,843,82
Cooling MC version (EN14511)Cooling capacity (1)kW248282335403509627770929107512601456
Absorbed power (1)kW647386106132163198243281328381
EER (1)3,883,863,903,803,863,853,893,823,833,843,82
SEER (2)4,935,115,125,235,195,225,405,345,415,465,31
Energy Efficiency (2)%194201202206205206213211213215209
CompressorQuantityn°11112222344
Refrigerant circuitsn°11111111111
Capacity stepsn°SteplessSteplessSteplessSteplessSteplessSteplessSteplessSteplessSteplessSteplessStepless
EvaporatorWater flowl/s11,8513,4716,0119,2524,3229,9636,7944,3951,3660,2069,56
Pressure dropskPa6440403544564668465059
Water connectionsDN100100100125125150150150150200200
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 currentA1681681682623293375095177636581002
Max. starting currentA25252533186194280288534515773
Unit with pumpPump available static pressurekPa150200195165175145155120170220185
Water connectionsDN100100100125125150150150150200200
Sound pressureSTD version (3)dB(A)6969696970707069707171
MC version (3)dB(A)6868686869696968697070
WeightsTransport weightkg24402440277027903685402040555710646074307640
Operating weightkg25102510290029203825417042255910668076607880

Dimensions

251291341411521641801981110112911501
LSTD/MCmm40004000500050006200720072008400100501110011100
WSTD/MCmm22002200220022002200220022002200220022002200
HSTD/MCmm21002100210021002100210021002500250025002500

Notes

  • 1 Chilled water from 12 to 7 °C, ambient air temperature 35 °C.
  • 2 Seasonal energy efficiency of cooling at low temperature. According to EU Regulation n. 2016/2281.
  • 3 Sound pressure level measured in free field conditions at 1 m from the unit. According to ISO 3744.
  • N.B. (1) Data of MC version are specified on technical brochure.