JWA/WP 051÷172 S/K/P/A

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

_ktk_icon_versions_cooling_heating.png _ktk_icon_compressor_scroll.png _ktk_icon_axial_fan.png _ktk_icon_plate.png _ktk_aqualogik_technology.png _icon_A_CLASS_2018_KTK_heating.png _ktk_icon_refrigerant_R410A.png ktk_icon_refrigerant_R452B.png ktk_icon_refrigerant_R454B.png

The reversible Heat Pumps of the JWA/WP 051÷172 S/K/P/A series, with R410A refrigerant, are designed for medium-sized service sector or industrial ambients and feature A CLASS energy efficiency.
They are used, combined with terminal units, for the heating or air conditioning of the rooms and are supplied with Modbus RTU protocol through RS485 serial interface.
Equipped with axial fans, Scroll compressors and plate 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.
The units 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.


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

Power range

  • 48.0-161 kW
  • 14.0-46.0 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.
  • Evaporator AISI 316 stainless steel braze welded plates type 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. On the units it is always installed an antifreeze heater.
  • 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.
  • Functioning in heating mode with outside air temperature down to -15 °C.
  • 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
  • DS Desuperheater
  • RT Total heat recovery
  • TX Coil with pre-coated fins
  • SI Inertial tank
  • PS Single circulating pump
  • PD Double circulating pump
  • FA Antifreeze heater for tank
  • FN Antifreeze heater for pipes
  • FO Antifreeze heater for tank and pipes
  • FG Antifreeze heater for single pump and pipes
  • FM Antifreeze heater for double pump and pipes
  • FUM Antifreeze heater for tank, single pump and pipes
  • FDM Antifreeze heater for 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
  • AG Rubber shock absorbers
  • AM Spring shock absorbers
HeatingHeating capacity (1)kW55,763,671,481,694,2109124142163197
Absorbed power (1)kW16,919,521,824,428,233,337,243,249,959,0
COP (1)3,303,263,283,343,343,273,333,293,273,34
Heating (EN14511)Heating capacity (1)kW55,963,871,681,894,4109124142163197
Absorbed power (1)kW17,119,822,124,828,633,737,744,050,759,9
COP (1)3,263,223,233,303,303,243,293,243,223,29
SCOP (2)3,433,393,383,503,523,423,443,413,403,39
Energy Efficiency (2)%134132132137138134135133133132
Energy Class (3)A+A+A+A+------
CoolingCooling capacity (4)kW48,254,962,571,982,394,5108125139161
Absorbed power (4)kW15,818,720,723,728,532,035,641,848,056,7
EER (4)3,052,943,023,032,892,953,032,992,902,84
Cooling (EN14511)Cooling capacity (4)kW48,154,862,471,882,194,4108125139161
Absorbed power (4)kW16,018,920,923,928,832,336,042,348,657,4
EER (4)3,012,902,983,002,862,933,002,952,852,80
Refrigerant circuits1111111122
Capacity steps2222233344
EvaporatorWater flowl/s2,302,622,983,433,924,505,155,966,637,67
Pressure dropskPa28303128282329393837
Water connections"G1 ½"1 ½"1 ½"2 ½"2 ½"2 ½"2 ½"2 ½"2 ½"2 ½"
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 currentA35414854657281102109132
Max. starting currentA130140144169209169197246225276
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 currentA39455157687786106114136
Max. starting currentA133143148173212173201250229280
Unit with tank and pumpPump available static pressurekPa155150140135150195185165160150
Tank water volumel400400400400400400400400600600
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/s2,302,622,983,433,924,505,155,966,637,67
Pump available static pressurekPa155145140135125165150135130120
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 versionsPa70601001001009560656065
SSL versionsPa70606560609560606060
ST versionsPa70601001001009560656065
SSL/ST versionsPa70606560609560606060
Sound pressureSTD and ST versions (5)dB(A)62626565656768686970
With SL accessory (5)dB(A)60606363636566666768
SSL and SSL/ST versions (5)dB(A)58586161606063636466
WeightsTransport weight (6)kg6356446937608079261076112612351414
Operating weight (6)kg6406507007708209401090114012501430
Weights (ST versions)Transport weightkg6506597087758229461096114612551434
Operating weightkg6556657157858309601110116012701450




  • 1 Heated water from 40 to 45 °C, ambient air temperature 7 °C d.b./6 °C w.b.
  • 2 Seasonal energy efficiency of heating at low temperature with average climatic conditions. According to EU Regulation n. 813/2013.
  • 3 Seasonal energy efficiency class of heating at low temperature with average climatic conditions. According to EU Regulation n. 811/2013.
  • 4 Chilled water from 12 to 7 °C, ambient air temperature 35 °C.
  • 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 versions are specified on technical brochure.