TWH 212÷342 S/K

Watercooled liquid Chillers and Heat Pumps with Scroll compressors and shell and tube exchangers

_ktk_icon_versions_cooling_only.png _ktk_icon_versions_cooling_heating.png _ktk_icon_compressor_scroll.png _ktk_icon_shell_and_tube.png _ktk_icon_refrigerant_R410A.png ktk_icon_refrigerant_R452B.png ktk_icon_refrigerant_R454B.png

The TWH 212÷342 S/K series liquid Chillers and Heat Pumps, with R410A refrigerant, are designed for medium and large domestic or industrial systems which require medium-high power, space-saving units and quiet operation. These units are ideal for indoor installation and, equipped with a self contained structure, they reduce the overall dimensions to a minimum while at the same time making installation and maintenance operations easier.
The units are characterized by multi-compressor design on double cooling circuit, to reach high energy performances, reduction of current at start-up, elimination of inertial tanks and excellent silent functioning. The use of components built in large series makes them highly reliable and the management of a high number of compressors allows increased life span with reduction of machine stopping risks and easier maintenance operations. A wide range of accessories, factory fitted or supplied separately, complete the outstanding versatility and functionality of the series.
Units are compliant to ErP 2021 European Regulations for comfort cooling application.
On request, units can be supplied with R452B or R454B refrigerant.


  • TWH - Cooling only
  • TWH/WP - Reversible Heat Pump
  • TWH/SSL - Super silenced cooling only
  • TWH/WP/SSL - Super silenced reversible Heat Pump

Power range

  • 225-375 kW
  • 64.0-107 Ton


  • Structure with supporting frame, made of galvanised sheet metal with additional protection provided by polyester powder coating.
  • Scroll compressors with oil sight glass, internal overheat protection and crankcase heater.
  • Shell and tube type condenser with two independent circuits on the refrigerant side and one on the water side.
  • 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 valve on liquid line in 302÷36012 models.
  • Electronic expansion valve.
  • Electronic high and low pressure gauges.
  • R410A refrigerant. On request R452B or R454B refrigerant.
  • Electrical board includes: main switch with door safety interlock, fuses, thermal protection relays for compressors, interface relay and terminals for external connections.
  • Microprocessor control and regulation system.

Factory fitted accessories

  • IM Automatic circuit breakers
  • SL Unit silencement
  • RFM Cooling circuit shut-off valve on discharge line
  • BT Low water temperature kit
  • HR Desuperheater
  • HRT Total heat recovery
  • FE Antifreeze heater for evaporator
  • SS Soft start
  • 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

Loose accessories

  • MN High and low pressure gauges
  • CR Remote control panel
  • PV2 2-Way electronic pressostatic valve
  • PV3 3-Way electronic pressostatic valve
  • AG Rubber shock absorbers
  • AM Spring shock absorbers
  • FL Flow switch
CoolingCooling capacity (1)kW225248271302343375
Absorbed power (1)kW535764727988
EER (1)4,254,354,234,194,344,26
Cooling (EN14511)Cooling capacity (1)kW225248271302343375
Absorbed power (1)kW535764727988
EER (1)4,254,354,234,194,344,26
SEER (2)5,315,525,525,675,585,81
Energy Efficiency (2)%204213213219215224
HeatingHeating capacity (3)kW291317345386434474
Absorbed power (3)kW67748191102113
COP (3)4,344,284,264,244,254,19
Heating (EN14511)Heating capacity (3)kW293319346387436476
Absorbed power (3)kW69778393105116
COP (3)4,254,144,174,164,154,10
SCOP (4)4,935,205,134,975,265,04
Energy Efficiency (4)%189200197191202194
Refrigerant circuits222222
Capacity steps666688
EvaporatorWater flowl/s10,7511,8512,9514,4316,3917,92
Pressure dropskPa383824273125
Water connectionsDN125125150150150150
CondenserWater flowl/s13,2814,5716,0117,8720,1622,12
Pressure dropskPa312831363536
Water connectionsDN656565656565
Electrical characteristicsPower supplyV/Ph/Hz400/3/50400/3/50400/3/50400/3/50400/3/50400/3/50
Max. running currentA136151163176201218
Max. starting currentA261284331344334385
Sound pressureSTD version (5)dB(A)686970717172
With SL accessory (5)dB(A)646567676768
SSL version (5)dB(A)606163636364
WeightsTransport weightkg137013991544155418192024
Operating weightkg147015001680169019502230




  • 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 Heated water from 40 to 45 °C, water temperature at the evaporator from 15 to 10 °C.
  • 4 Seasonal energy efficiency of heating at low temperature with average climatic conditions. According to EU Regulation n. 813/2013.
  • 5 Sound pressure level measured in free field conditions at 1 m from the unit. According to ISO 3744.
  • N.B. (1) Weights of SSL and WP versions are specified on technical brochure.