TWA 212÷682 S/K/P/AF

A CLASS energy efficiency aircooled liquid Chillers and Heat Pumps with axial fans, Scroll compressors and plate exchanger

_ktk_icon_versions_cooling_only.png _ktk_icon_versions_cooling_heating.png _ktk_icon_compressor_scroll.png _ktk_icon_axial_fan.png _ktk_icon_plate.png _icon_A_CLASS_2018_KTK_cooling.png _icon_A_CLASS_2018_KTK_heating.png _ktk_icon_refrigerant_R410A.png ktk_icon_refrigerant_R452B.png ktk_icon_refrigerant_R454B.png

The TWA 212÷682 S/K/P/AF liquid Chillers and Heat Pumps are characterized by A CLASS energy efficiency.
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.
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.
The units are compliant to the ErP Regulation.
On request, units can be supplied with R452B or R454B refrigerant.


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

Power range

  • 197-692 kW
  • 56.0-197 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.
  • Axial fans directly coupled to an electric motor with external rotor.
  • Condenser made of copper tubes and aluminium finned coils.
  • Evaporator AISI 316 stainless steel braze welded plates type with two independent circuits on the refrigerant side and one on the water side, complete with water differential pressure switch. On the Heat Pump units it is always installed an antifreeze heater.
  • Cooling circuit shut-off valve on liquid line in 302÷682 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 or magnetothermic switches, thermal protection relays for compressors and thermocontacts for fans.
  • Functioning in heating mode with outside air temperature down to -15 °C.
  • Microprocessor control and regulation system.

Factory fitted accessories

  • IM Automatic circuit breakers
  • SL Unit silencement
  • RFM Cooling circuit shut-off valve on discharge line
  • CT Condensing control down to 0 °C
  • 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
  • DS Desuperheater
  • RT Total heat recovery
  • TX Coil with pre-coated fins
  • EW External water connections
  • PS Single circulating pump
  • PSI Inverter single circulating pump
  • PD Double circulating pump
  • PDI Inverter double circulating pump
  • FN Antifreeze heater for pipes
  • FG Antifreeze heater for single pump and pipes
  • FM Antifreeze heater for double pump and pipes
  • 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
  • RP Coils protection metallic guards
  • FP Coils protection metallic guards with filter
  • AG Rubber shock absorbers
  • AM Spring shock absorbers
CoolingCooling capacity (1)kW197220245271300329361396435485538609692
Absorbed power (1)kW6269768395105111124137154169192220
EER (1)3,183,193,223,273,163,133,253,193,183,153,183,173,15
Cooling (EN14511)Cooling capacity (1)kW196219244270299328360394433484536607690
Absorbed power (1)kW6370778496105112126139155171194222
EER (1)3,113,133,173,213,113,123,213,133,123,123,133,133,11
SEER (2)4,184,194,234,244,204,204,214,484,564,594,574,564,60
Energy Efficiency (2)%164165166167165165165176179181180179181
HeatingHeating capacity (3)kW214239266295325359391431473526586663754
Absorbed power (3)kW6573818899109119129143162176202231
COP (3)3,293,273,283,353,283,293,293,343,313,253,333,283,26
Heating (EN14511)Heating capacity (3)kW215240267296327360393433475528588665756
Absorbed power (3)kW67758390102112122133147165181206236
COP (3)3,213,203,223,293,213,213,223,263,233,203,253,233,20
SCOP (4)3,353,423,353,343,373,343,353,363,323,363,313,333,43
Energy Efficiency (4)%131134131131132131131131130131129130134
Refrigerant circuits2222222222222
Capacity steps66668888810101010
EvaporatorWater flowl/s9,4110,5111,7112,9514,3315,7217,2518,9220,7823,1725,7029,1033,06
Pressure dropskPa45494442503946494933413432
Water connectionsDN808080808080808080150150150150
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 currentA152166187199224241258274324358391446500
Max. starting currentA276299354367357409426407492525558623678
Unit with pumpPump available static pressurekPa155135205185180185170155125185170160145
Water connectionsDN100100100100100100100100100100100150150
Sound pressureSTD version (5)dB(A)72737474747474767675767777
With SL accessory (5)dB(A)69707171717172737372737474
SSL version (5)dB(A)6666676867686869696970------
WeightsTransport weightkg1854217122892317243726802690286930043512364244204458
Operating weightkg1870219023102340246027102720290030403560369044804520




  • 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. 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.