TWH 252-T÷2122-T VV/Y/A

A CLASS energy efficiency watercooled liquid Chillers with (Inverter) Screw compressors and shell and tube exchangers

_ktk_icon_versions_cooling_only.png _ktk_icon_compressor_Screw_inverter.png _ktk_icon_compressor_screw.png _ktk_icon_shell_and_tube.png _ktk_icon_gsm.png _icon_A_CLASS_2018_KTK_cooling.png _ktk_icon_refrigerant_R134a.png ktk_icon_refrigerant_R513A.png

The liquid Chillers of the TWH 252-T÷2122-T VV/Y/A series, with A CLASS energy efficiency and R134a refrigerant, are designed to satisfy the needs of the service sector or industrial systems requiring high power.
Equipped with latest generation Screw compressors, shell and tube exchangers and connections for condensation with cooling tower water or well water or with a Dry-Cooler, these units have a series of accessories which are factory fitted or supplied separately. Designed and produced to optimize the layout of each component so as to make any necessary maintenance operations more convenient, these units have an essential and compact structure intended for indoor installation. Furthermore, accessories as the Inverter control on one Screw compressor or both is also available for getting the highest efficiency at part load and a significant reduction of starting current.
The units are compliant to the 2021 ErP Regulation.
On request, units can be supplied with R513A refrigerant.


  • TWH - Cooling only
  • TWH/SSL - Super silenced cooling only

Power range

  • 250-2143 kW
  • 71.0-609 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.
  • Shell and tube type condenser, with easily removable cast iron heads to enable access for maintenance operations. Each cooling circuit is supplied with an independent condenser. Water connections for cooling tower and Dry-Cooler operation; on request for well water.
  • 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.
  • Microprocessor control and regulation system.

Factory fitted accessories

  • IM Automatic circuit breakers
  • BT Low water temperature kit
  • HR Desuperheater
  • HRT Total heat recovery
  • FE Antifreeze heater for evaporator
  • II Inverter on one compressor and soft start for other compressors
  • ID Inverter on all compressors
  • SS Soft start
  • DP Device for heat pump operation
  • HTW Device for high temperature hot water production.
  • 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
  • PV3 3-Way electronic pressostatic valve
  • AG Rubber shock absorbers
  • AM Spring shock absorbers
  • FL Flow switch
CoolingCooling capacity (1)kW2503073594274995726757839011040118313421497166219022143
Absorbed power (1)kW46,258,165,478,185,0101121137157182205235255293355374
EER (1)5,415,285,495,475,875,665,585,725,745,715,775,715,875,675,365,73
Cooling (EN14511)Cooling capacity (1)kW2503073594274995716747829011039118213411496166119012142
Absorbed power (1)kW47,660,067,780,788,4104125142163188212243265301366387
EER (1)5,255,125,305,295,645,495,395,515,535,535,585,525,655,525,195,53
SEER (2)6,356,556,716,686,876,876,986,876,997,077,237,217,297,227,127,12
Energy Efficiency (2)%246254260259267267271267272275281280284281277277
Refrigerant circuits2222222222222222
Capacity stepsSteplessSteplessSteplessSteplessSteplessSteplessSteplessSteplessSteplessSteplessSteplessSteplessSteplessSteplessSteplessStepless
EvaporatorWater flowl/s11,9414,6717,1520,4023,8427,3332,2537,4143,0549,6956,5264,1271,5279,4190,87102
Pressure dropskPa43374039343838524344425259405049
Water connectionsDN125150150150200200200200200250250250250250250300
CondenserWater flowl/s14,1517,4420,2824,1327,9032,1538,0343,9650,5558,3866,3275,3583,7193,41108120
Pressure dropskPa19273235373734403941374035324241
Water connectionsDN808080808080100100100100125125125125125125
Electrical characteristicsPower supplyV/Ph/Hz400/3/50400/3/50400/3/50400/3/50400/3/50400/3/50400/3/50400/3/50400/3/50400/3/50400/3/50400/3/50400/3/50400/3/50400/3/50400/3/50
Max. running currentA18418221024027830639244452859067277073080412961464
Max. starting currentA20021824528234738347155956465378489391299215831667
Sound pressureSTD version (3)dB(A)75757575767676767777777879798182
SSL version (3)dB(A)71717171727272727373737475757778
WeightsTransport weightkg19832254242326252943303937154079486252596070631578438263971310308
Operating weightkg214024602620286032603350411046105520604068207110879092501070011470




  • 1 Chilled water from 12 to 7 °C, water temperature at the condenser from 30 to 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) Weights of SSL version are specified on technical brochure.