JWA 051÷172 S/K

Aircooled liquid Chillers and Heat Pumps with axial fans, Scroll compressors and shell and tube 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_shell_and_tube.png _ktk_aqualogik_technology.png _ktk_icon_refrigerant_R410A.png ktk_icon_refrigerant_R452B.png ktk_icon_refrigerant_R454B.png

The liquid Chillers and Heat Pumps of the JWA 051÷172 S/K series, with R410A refrigerant, are designed for medium-sized service sector or industrial ambients.
They are used, combined with Fan Coil units, for the air conditioning of the rooms or to remove the heat developed during industrial processes. They can be supplied with Modbus RTU protocol through RS485 serial interface.
Equipped with axial fans, Scroll compressors and shell and tube exchanger, even in the super silent version, these units can be completed by a hydraulic circuit with tank, with pump, with tank and pump or with AQUALOGIK technology.
The AQUALOGIK smart control system optimises the water set point and modulates the power supply voltage of the pump and the fans, thus making the use of the inertial tank superfluous. This obtains high energy efficiency, quiet operation and optimised dimensions and costs.
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 for indoor ducted installation.
Units are compliant to the ErP 2021 Regulation for process cooling application; for comfort cooling application they are compliant if provided with EC or ECH accessory (EC Inverter fans).
On request, units can be supplied with R452B or R454B refrigerant.


  • JWA - Cooling only
  • JWA/WP - Reversible Heat Pump
  • JWA/SSL - Super silenced cooling only
  • JWA/WP/SSL - Super silenced reversible Heat Pump
  • JWA/ST - Cooling only with AQUALOGIK technology
  • JWA/WP/ST - Reversible Heat Pump with AQUALOGIK technology
  • JWA/SSL/ST - Super silenced cooling only with AQUALOGIK technology
  • JWA/WP/SSL/ST - Super silenced reversible Heat Pump with AQUALOGIK technology

Power range

  • 49.0-179 kW
  • 14.0-51.0 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 coil.
  • Shell and tube type evaporator with one circuit on the refrigerant side and one on the water side in 051÷131 models; with two independent circuits on the refrigerant side and one on the water side in 152÷172 models, complete with water differential pressure switch.
  • R410A refrigerant. On request R452B or R454B refrigerant.
  • Electrical board includes: main switch with door safety interlock, fuses, thermal protection relays for compressors and thermocontacts for fans.
  • On ST versions water circuit includes INVERTER circulating pump, safety valve and expansion vessel.
  • On ST versions Condensing Control is included: electronic proportional device that ensures efficient and continuous functioning of the unit with outside air temperature down to –20 °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, an high/low pressure transducer on cooling circuit and an electrical heater on electrical board.
  • Microprocessor control and regulation system (with AQUALOGIK technology on ST versions).

Factory fitted accessories

  • IM Automatic circuit breakers
  • SL Unit silencement
  • RFM Cooling circuit shut-off valve on discharge line
  • RFL Cooling circuit shut-off valve on liquid 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
  • HR Desuperheater
  • HRT/S Total heat recovery in series
  • HRT/P Total heat recovery in parallel
  • TX Coil with pre-coated fins
  • EW External water connections
  • SP Inertial tank
  • PU Single circulating pump
  • PD Double circulating pump
  • SPU Inertial tank and single circulating pump
  • SPD Inertial tank and double circulating pump
  • FE Antifreeze heater for evaporator
  • FN Antifreeze heater for pipes
  • 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
  • SS Soft start
  • IS Modbus RTU protocol, RS485 serial interface

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
CoolingCooling capacity (1)kW49,055,062,473,384,395,2109129149179
Absorbed power (1)kW16,618,821,525,328,631,637,543,750,758,8
EER (1)2,952,932,902,902,953,012,912,952,943,04
Cooling (EN14511)Cooling capacity (1)kW48,854,762,072,883,994,7108128148178
Absorbed power (1)kW16,819,121,925,829,032,138,144,351,459,5
EER (1)2,902,862,832,822,892,952,832,892,882,99
SEER (2)3,953,973,913,923,983,983,863,984,014,02
Energy Efficiency (2)%155156153154156156151156157158
Cooling with EC/ECH (EN14511)SEER with EC or ECH accessory (2)4,144,144,134,104,164,134,104,204,214,27
Energy Efficiency with EC or ECH accessory (2)%163163162161163162161165165168
HeatingHeating capacity (3)kW55,761,970,280,791,4105119137156188
Absorbed power (3)kW17,819,622,825,729,133,438,144,251,161,0
COP (3)3,133,163,083,143,143,143,123,103,053,08
Heating (EN14511)Heating capacity (3)kW56,062,270,781,391,9106120138157189
Absorbed power (3)kW18,020,023,526,629,834,239,145,152,362,3
COP (3)3,113,113,013,063,083,103,073,063,003,03
SCOP (4)3,283,233,213,243,293,293,213,293,253,25
Energy Efficiency (4)%128126125127129129125129127127
Energy Class (5)A+A+A+A+------
Refrigerant circuits1111111122
Capacity steps2222233344
EvaporatorWater flowl/s2,312,602,953,463,984,505,156,097,048,45
Pressure dropskPa22295055403945364338
Water connections"G1 ½"1 ½"2"2"2 ½"2 ½"2 ½"3"3"3"
Electrical characteristicsPower supplyV/Ph/Hz400/3/50400/3/50400/3/50400/3/50400/3/50400/3/50400/3/50400/3/50400/3/50400/3/50
Max. running currentA3541485465698198105132
Max. starting currentA130140144169209166197242221276
Electrical characteristics (ST versions)Power supplyV/Ph/Hz400/3/50400/3/50400/3/50400/3/50400/3/50400/3/50400/3/50400/3/50400/3/50400/3/50
Max. running currentA39455157687386102110136
Max. starting currentA133143148173212170201246226280
Unit with tank and pumpPump available static pressurekPa160150125110140180170170150140
Tank water volumel470470470470470470470470660660
Water connections"G2 ½"2 ½"2 ½"2 ½"2 ½"2 ½"2 ½"2 ½"2 ½"2 ½"
Unit ST versionsWater flowl/s2,312,602,953,463,984,505,156,097,048,45
Pump available static pressurekPa160150120105110145135140120110
Water connections"G2 ½"2 ½"2 ½"2 ½"2 ½"2 ½"2 ½"2 ½"2 ½"2 ½"
ECH fan available static pressureSTD versionsPa90801001001008095756060
SSL versionsPa858575757050706060---
ST versionsPa90801001001008095756060
SSL/ST versionsPa909080808550705550---
Sound pressureSTD and ST versions (6)dB(A)61616464656667676767
With SL accessory (6)dB(A)59596262636465656565
SSL and SSL/ST versions (6)dB(A)575760606162636363---
WeightsTransport weight (7)kg641661701719844931971111211921428
Operating weight (7)kg6606807207408709601000115012301470
Weights (ST versions)Transport weightkg655675715735860950990113012101450
Operating weightkg6606907307508759701010115012301470




  • 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 Seasonal energy efficiency class of heating at low temperature with average climatic conditions. According to EU Regulation n. 811/2013.
  • 6 Sound pressure level measured in free field conditions at 1 m from the unit. According to ISO 3744.
  • 7 Unit without tank and pump.
  • N.B. (1) Weights of SSL and WP versions are specified on technical brochure.