GLIDER EVO FREE CLA...... R134a ..... 288 ÷ 1445 kW

MAIN FEATURES
Air cooled liquid chiller with free-cooling system.
21 models available, for a wide selection opportunity.
Average step of 50 kW
EER up to 2,73
ESEER up to 3,25
Twin-Screw compressors.
R134a Refrigerant charge.
Double refrigerant circuit.
Shell and tube evaporator.
AC Axial fans.
Double air circuit.
Electronic expansion valve.
Suitable for outdoor installation.
 
INDIRECT FREE COOLING SYSTEM
Complete cooling of the chilled water of the existing cooling system with the outside air. The energy saving will be higher the longer the outside temperature remains below the required temperature for cooling.

WORKING LIMITS IN COOLING MODE
Chilled water outlet temperature: -10÷15°C Ambient temperature: -20÷45°C

WORKING LIMITS IN FREE-COOLING MODE
Minimum chilled water outlet temperature: -15°C Minimum ambient temperature: -20°C
 

MAIN BENEFITS
Indirect free cooling system.
Availability of Glycol Free system.
Low footprint.
Availability of kit for the reduction and the extreme reduction of the noise.
Availability of pumping groups.
Availability of partial heat recovery system.
Availability of EC axial fans for a higher efficiency.
Complete set of components dedicated to the safety of the unity.
 

 
MAIN COMPONENTS
FRAMEWORK
Base, self supporting frame and paneling in steel plate with protective surfaces treatment in compliance with UNI ISO 9227/ASTMB117 and ISO 7253, and painted with epoxy powders.
Colour: RAL 9002

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 safety relief valve (overpressure inner valve).
Replaceable cartridge type oil filter.
Valves for oil filling and discharge.
Oil 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 from model 290 V2 F06 to model 470 V2 F08 included.
2-pole 3-phase electric motor with Star / Delta starting from model 520 V2 F08 to model 1220 V2 F16 included.
Stepless capacity control, 50÷100% for each compressor.
Crankcase heater.
Terminal box with IP54 enclosure class.
Rubber supports.

EVAPORATOR
Single pass type 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.
Hydraulic connections with grooved end arranged for flexible joint (the flexible joint and the adapter pipe are optional accessories).

CONDENSING AND FREE-COOLING COIL
Heat exchangers contained in single coil with high efficiency aluminium fins, specifically developed to provide high heat transfer and lower pressure drops. The combination of two factors, special tubes and fins, allow to optimally combine the following aspects:
Maximum capacity relative to the size of the exchanger.
Minimum charge of refrigerant.
Reduction of the air flow required for the heat exchange.
Frame in galvanized steel.
Motorized valves for free-cooling water circuit control.
Temperature sensor on ambient air.

FANS SECTION
Axial fans with sickle-shaped blades, fan guard and optimized for low noise levels.
External rotor AC type electric motor.
Stepless variable speed with phase-cut electronic controller for condensing pressure control.
Stepless variable speed with phase-cut electronic controller for free-cooling
control.
IP54 enclosure class.
 

REFRIGERANT CIRCUIT
Component 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.
Energy reserve module for the electronic expansion valve to allow the closure of the valve in the event of lack of power supply.
Sight glass.
Filter dryer on liquid line.
Service valves on liquid line.
Service valves on compressor gas discharge.
Double safety valve (only one in function) on high and low pressure side. The system include two safety valves with manual changeover system.
Pressure transducers with indication, control and protection functions, on low and high refrigerant pressure and oil pressure.
High pressure safety switch with manual reset.
Pressure gauge on high and low pressure.
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 outdoor installation, complete with:
Main switch with door lock safety.
Fuses for each compressor.
Magnetothermic switches for fans.
Fuses for water pumps (if scheduled).
Contactors for each load.
Compressor Part-Winding starting system from model 290 V2 F06 to model 470 V2 F08 included.
Compressor Star / Delta starting system from model 520 V2 F08 to model 1220 V2 F16 included.
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.
Nonvolatile “Flash” memory for data storage.
Menu with protection password.
LAN connection.
Additional module “1” for ambient air temperature inlet.
Driver for the additional module “1”.

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).