FRIGO SCREW HR......R134a.....394 ÷ 1755 kW

MAIN FEATURES
Water cooled liquid chiller.
14 models available, for a wide selection opportunity.
Average step of 80kW.
EER up to 5,06.
Twin-screw compressors.
Double refrigerant circuit.
R134a Refrigerant charge.
Electronic expansion valve.
Shell and tube heat exchangers.
Total heat recovery system.
Suitable for indoor installation.

MAIN BENEFITS
High EER.
Availability of kit for the reduction of the noise.
Easily of maintenance.
Eurovent Certification.
 
INDOOR INSTALLATION
The machines are designed for indoor installation.

ELECTRONIC EXPANSION VALVE
The electronic expansion valves are synonymous of an higher energy efficiency and stability of the system.

TOTAL HEAT RECOVERY SYSTEM
The condensers of the units are equipped with a double hydraulic circuit the first circuit for the condensation of the refrigerant gas and the second for the total recovery of the condensing heat.

WORKING LIMITS IN COOLING MODE
Evaporator chilled water outlet temperature: -11÷15,5°C Condenser outlet water temperature: 21÷49°C
 

 
COMPONENTS
FRAMEWORK
Base and self supporting frame in steel plate with protective surfaces treatment in compliance with UNI ISO 9227/ASTMB117 and ISO 7253, and painted with epoxy powders.
Colour: RAL 9005

COMPRESSORS
Twin screw semi-hermetic compressors with highly efficient screw profile and high peripheral speed, optimized for R134a refrigerant.
Integrated discharge check valve.
Flanged-on oil separator.
Integrated overpressure valve.
Replaceable cartridge type oil filter.
Oil flow switch.
Valves for oil filling and discharge.
Sight glass
Electronic protection device that includes:
Electric motor thermal protection via internal winding temperature sensors.
Phase sequence electronic relay
Sensor on refrigerant discharge for temperature monitoring,
2-pole 3-phase electric motor with Part-Winding starting for models 410 V2
/ 460 V2 / 510 V2 / 540 V2 / 610 V2
2-pole 3-phase electric motor with Star / Delta starting for all other machines.
Stepless capacity control, 50÷100% for each compressor.
Crankcase heater.
Terminal box with IP54 enclosure class.
Rubber supports.

EVAPORATOR
Shell and tube evaporator optimized for R134a refrigerant.
Tubes with a helical rifled internal surface.
Intermediate baffles positioned to ensure optimum speed of the fluid and low pressure drops.
Single circuit on water side and independent circuits, one for each compressor, on refrigerant side.
Shell, header, tube sheets, made of carbon steel, tubes in Cu.
Anticondensate insulation made of polyurethane.
Temperature sensors on water inlet and outlet.
Threaded hydraulic connections or with grooved end arranged for flexible joint (the flexible joint and the adapter pipe are optional accessories).

CONDENSER
One condenser for each refrigerant circuit:
Shell and tube condenser optimized for R134a refrigerant.
Shell, header, tube sheets made of carbon steel, tubes in Cu.
Threaded hydraulic connections or with grooved end arranged for flexible joint (the flexible joint and the adapter pipe are optional accessories).

TOTAL HEAT RECOVERY HEAT EXCHANGER
One heat exchanger for each refrigerant circuit:
Shell and tube condenser optimized for R134a refrigerant.
Shell, header, tube sheets made of carbon steel, tubes in Cu.
Threaded hydraulic connections or with grooved end arranged for flexible joint (the flexible joint and the adapter pipe are optional accessories).
 

•REFRIGERANT CIRCUIT
Components for each refrigerant circuit:
Electronic expansion valve that allows high performance and system efficiency thanks to a timely and accurate response to changes in temperature and pressure.
Sight glass.
Filter dryer on liquid line.
Service valves on liquid line.
Service valves on gas discharge.
Safety valve on low pressure side.
Safety valve on high pressure side.
Pressure transducers with indication, control and protection functions, on low and high refrigerant pressure and oil pressure.
High pressure safety switch with manual reset.
Refrigerant circuit with copper tubing with anticondensate insulation of the suction line.
Plastic capillary hoses for pressure sensors connection.
R134a refrigerant charge.

ELECTRICAL PANEL
In accordance with EN60204-1 norms, suitable for indoor installation, complete with:
Main switch with door lock safety.
Fuses for each compressors.
Contactors for each compressors (2 contactors for Part-Winding start system – 3 contactors for Star / Delta start system).
Compressor Part-Winding start system for model 410 V2 / 460 V2 / 510 V2
/ 540 V2 / 610 V2
Compressor Star / Delta start system for all other machines.
Transformer for auxiliary circuit and microprocessor supply.
Panel with machine controls.
Power supply: 400/3/50.

CONTROL SYSTEM
MP.COM microprocessor system with graphic display for control and monitor of operating and alarms status. The system includes:
Voltage free contact for remote general alarm.
Main components hour-meter.
Integrated “Data logger” function for the recording of events and alarms.
Nonvolatile “Flash” memory for data storage.
Menu with protection password.

HYDRAULIC CONNECTIONS OF HEAT EXCHANGERS
Heat exchangers threaded hydraulic connections ISO 228/1 – G M, available up to a diameter of 3” included.
Pipes threaded hydraulic connections ISO 7/1 – R, available up to a diameter of 3” included.
The hydraulic connections with flange (FL) are not supplied with counter flange.
The hydraulic connections with grooved end are not supplied with flexible joint (optional accessory).