TWA 332÷1822 VV/Y/A

A CLASS energy efficiency aircooled liquid Chillers and Heat Pumps with axial fans, (Inverter) Screw compressors and shell and tube exchanger

_ktk_icon_versions_cooling_only.png _ktk_icon_versions_cooling_heating.png _ktk_icon_compressor_Screw_inverter.png _ktk_icon_compressor_screw.png _ktk_icon_axial_fan.png _ktk_icon_shell_and_tube.png _ktk_icon_microchannel.png _ktk_icon_gsm.png _icon_A_CLASS_2018_KTK_cooling.png _icon_A_CLASS_2018_KTK_heating.png _ktk_icon_refrigerant_R134a.png ktk_icon_refrigerant_R513A.png

The TWA 332÷1822 VV/Y/A units, in A CLASS energy efficiency, have extremely high efficiency levels due to reduced electrical absorption and a high efficiency of the compressor-exchanger combination.
The latest generation Screw compressors and the new design optimized in every detail ensure the reach of the highest efficiency. Furthermore, accessories as the Inverter control on Screw compressors, on circulating pumps and EC Inverter on fans are also available for getting the highest efficiency at part load.
The Microchannel condensing coils, available on dedicated versions, ensure an even higher efficiency (high EER), having a better heat exchange than traditional coils. A wide range of accessories, factory fitted or supplied separately, complete the outstanding versatility and functionality of the series.
Are available as option the new EC Inverter fans with high available static pressure and efficiency.
The Heat Pump versions are designed for hot water production up to 55°C.
On request, units can be supplied with R513A refrigerant.
Cooling only models 1302÷1702 are compliant to the ErP 2021 Regulation. Cooling only models 1902÷6002 are compliant to the ErP 2021 Regulation for process cooling application; for comfort cooling application they are compliant with EC or ECH accessory (EC Inverter fans).
Heat pump models 1302÷2002 are compliant to the ErP Regulation; models 2602÷6002 are compliant if provided with EC or ECH accessory (EC Inverter fans).


  • TWA - Cooling only
  • TWA/MC - Cooling only with MICROCHANNEL condensing coils
  • TWA/WP - Reversible Heat Pump
  • TWA/SSL - Super silenced cooling only
  • TWA/MC/SSL - Super silenced cooling only with MICROCHANNEL condensing coils
  • TWA/WP/SSL - Super silenced reversible Heat Pump

Power range

  • 263-1533 kW
  • 75.0-436 Ton


  • Structure with supporting frame, made of galvanised sheet metal with additional protection provided by polyester powder coating.
  • Screw compressors with built-in oil separator, suction filter, crankcase heater, oil sight glass, thermal protection and stepless capacity steps.
  • Axial fans directly coupled to an electric motor with external rotor.
  • Condenser made of copper tube and aluminum finned coils or aluminium MICROCHANNEL coils.
  • Shell and tube evaporator with 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 discharge and liquid line.
  • Electronic expansion valve.
  • Electronic high and low pressure gauges.
  • R134a refrigerant. On request R513A refrigerant.
  • Electrical board includes: main switch with door safety interlock, fuses, thermal protection relays for compressors and thermocontacts for fans.
  • Condensing Control is included: electronic proportional device that ensures efficient and continuous functioning of the unit with outside air temperature down to 0 °C in cooling mode. It also allows to reduce the sound level especially at night. It consists of a fans speed controller with continuous speed regulation and high and low pressure transducers on cooling circuit.
  • Functioning in heating mode with outside air temperature down to -10 °C.
  • Microprocessor control and regulation system.

Factory fitted accessories

  • IM Automatic circuit breakers
  • SL Unit silencement
  • CC Condensing control down to -20 °C
  • BT Low water temperature kit
  • EC EC Inverter fans
  • ECH EC Inverter fans with high available static pressure
  • HR Desuperheater
  • HRT/S Total heat recovery in series
  • HRT/P Total heat recovery in parallel
  • TX Coil with pre-coated fins
  • TXB Coil with epoxy treatment
  • EW External water connections
  • SP Inertial tank
  • PU Single circulating pump
  • PUI Inverter single circulating pump
  • PD Double circulating pump
  • PDI Inverter double circulating pump
  • SPU Inertial tank and single circulating pump
  • SPUI Inertial tank and Inverter single circulating pump
  • SPD Inertial tank and double circulating pump
  • SPDI Inertial tank and Inverter double circulating pump
  • FE Antifreeze heater for evaporator
  • FX Antifreeze heater for evaporator and pipes
  • FB Antifreeze heater for evaporator/tank
  • FQ Antifreeze heater on evaporator/tank and pipes
  • FZ Antifreeze heater for evaporator, single pump and pipes
  • FH Antifreeze heater for evaporator, double pump and pipes
  • FU Antifreeze heater for evaporator/tank, single pump and pipes
  • FD Antifreeze heater for evaporator/tank, double pump and pipes
  • II Inverter on one compressor and soft start for other compressors
  • ID Inverter on all compressors
  • SS Soft start
  • WM Web Monitoring - Wireless remote monitoring (GPRS/EDGE/3G/TCP-IP)
  • IS Modbus RTU protocol, RS485 serial interface
  • 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
  • FP Coils protection metallic guards with filter
  • AG Rubber shock absorbers
  • AM Spring shock absorbers
  • FL Flow switch
Cooling STD versionsCooling capacity (1)kW2633133594134645746968399591136126413981533
Absorbed power (1)kW8296114131146179219256305352380440480
EER (1)3,213,263,153,153,183,213,183,283,143,233,333,183,19
Cooling STD versions (EN14511)Cooling capacity (1)kW2623123584124635736948379561132126313971532
Absorbed power (1)kW8397115132147180221258308356383444485
EER (1)3,163,223,113,123,153,183,143,243,103,183,303,153,16
SEER (2)4,134,254,224,144,184,194,114,254,304,234,244,174,22
Energy Efficiency (2)%162167166163164165161167169166167164166
SEER with EC or ECH accessory (2)4,634,764,734,734,744,774,654,864,854,694,744,714,73
Energy Efficiency with EC or ECH accessory (2)%182187186186187188183191191185187185186
Cooling MC versionsCooling capacity (1)kW2633133594134645746968399591136126413981533
Absorbed power (1)kW8094112128143175215251299345372431470
EER (1)3,293,333,213,233,243,283,243,343,213,293,403,243,26
Cooling MC versions (EN14511)Cooling capacity (1)kW2623123584124635736948379561132126313971532
Absorbed power (1)kW8195113129144176217253302349375435475
EER (1)3,233,283,173,193,223,263,203,313,173,243,373,213,23
SEER (2)4,144,264,234,154,194,194,124,254,314,254,244,174,23
Energy Efficiency (2)%163167166163165165162167169167167164166
SEER with EC or ECH accessory (2)4,644,774,744,744,754,784,664,874,864,704,754,724,74
Energy Efficiency with EC or ECH accessory (2)%183188187187187188183192191185187186187
Heating STD versionsHeating capacity (3)kW2723243724284805947218699931176---------
Absorbed power (3)kW8195113130144177217253302348---------
COP (3)3,363,413,293,293,333,363,323,433,293,38---------
Heating STD versions (EN14511)Heating capacity (3)kW2733253734304825967238729961180---------
Absorbed power (3)kW8397116133147181222259309356---------
COP (3)3,293,343,233,233,273,293,263,363,223,31---------
SCOP (4)3,203,323,343,333,323,343,323,363,323,36---------
Energy Efficiency (4)%125130131130130131130131130131---------
Refrigerant circuits2222222222222
Capacity stepsSteplessSteplessSteplessSteplessSteplessSteplessSteplessSteplessSteplessSteplessSteplessSteplessStepless
EvaporatorWater flowl/s12,5714,9517,1519,7322,1727,4233,2540,0945,8254,2860,3966,7973,24
Pressure dropskPa30264944342842343948384659
Water connectionsDN125125150150150150150200200200250250250
Electrical characteristicsPower supplyV/Ph/Hz400/3/50400/3/50400/3/50400/3/50400/3/50400/3/50400/3/50400/3/50400/3/50400/3/50400/3/50400/3/50400/3/50
Max. running currentA2012372613013373934855806647209228761002
Max. starting currentA263281337361405504596785827855126712611379
Unit with tank and pumpPump available static pressurekPa13015015514017516016514512016014095180
Tank water volumel20002000200020002000200030003000---------------
Water connectionsDN100100100125125150150150200200200200200
Sound pressureSTD versions (5)dB(A)76767676777677777778797980
STD versions with SL accessory (5)dB(A)73737373747374747475767677
SSL versions (5)dB(A)66666665666667686869---------
MC versions (5)dB(A)75757575767576767677787879
MC versions with SL accessory (5)dB(A)72727272737273737374757576
MC/SSL versions (5)dB(A)65656564656566676768---------
WeightsTransport weight (6)kg356236093708420747825202649674307484877396401038010800
Operating weight (6)kg3690374038504390507055406790807081709230101601089011270




  • 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 Heated water from 40 to 45 °C, ambient air temperature 7 °C d.b./6 °C w.b.
  • 4 Seasonal energy efficiency of heating at low temperature with average climatic conditions. According to EU Regulation n. 811/2013.
  • 5 Sound pressure level measured in free field conditions at 1 m from the unit. According to ISO 3744.
  • 6 Unit without tank and pump.
  • N.B. (1) Weights of SSL and WP versions are specified on technical brochure.
  • N.B. (2) Data of MC versions are specified on technical brochure.