MAXIMO PF...... R410A ..... 21,4 ÷ 289,0 kW

MAIN FEATURES
Air cooled liquid chiller with free-cooling system.
29 models available, for a wide selection opportunity.
Average step of 12,5kW.
EER up to 2,82.
ESEER up to 3,47.
Scroll compressors.
R410A Refrigerant charge.
Single or double refrigerant circuit.
Plate type heat exchangers.
EC Plug fan.
Single air circuit.
Electronic expansion valve.
Suitable for outdoor installation.

MAIN BENEFITS
Units equipped with two scroll compressors for refrigerant circuit to reach a high efficiency.
Units with single and double refrigerant circuits.
Indirect free cooling system.
High ESEER.
EC Plug fan for a high efficiency.
Availability of kit for the reduction of the noise.
Availability of pumping groups.
Availability of partial heat recovery system.
Easily of maintenance.
Components dedicated to the safety of the unity.
Eurovent Certification.
 
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.

INDOOR INSTALLATION
The machines are designed for indoor installation and ducting for air suction and discharge. For outdoor installation the use of the
dedicated optional kit is mandatory. The machine must be installed under a
cover or anyway protected against atmospherics agent.

WORKING LIMITS IN COOLING MODE
Chilled water outlet temperature: 4÷15°C Ambient temperature: -10÷45°C

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

 
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
Orbiting spiral (SCROLL) hermetic compressors with spiral profile optimized for R410A refrigerant.
ON / OFF capacity control (0 / 100% each compressor).
2-pole 3-phase electric motor with direct on line starting.
Phase sequence electronic relay.
Crankcase heater.
Electric motor thermal protection via internal winding temperature sensors.
Rubber supports.

EVAPORATOR
Copper brazed plate type with cover plates, plates and connections in AISI 316 stainless steel:
With single refrigerant circuit for S version machines.
With double refrigerant circuit for D version machines.
Anticondensate insulation made of polyurethane.
Temperature sensors on water inlet and outlet.
Differential water pressure switch for water flow control.
Antifreeze heater.

CONDENSING COIL
Heat exchanger coil with internally corrugated copper tubes and 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.
Sub-cooling circuit to allow a significant increase in cooling capacity.
Frame in galvanized steel.

FREE-COOLING COIL
Heat exchanger coil with copper tubes and 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.
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
Centrifugal fans with backward curved blades, single suction and without scroll housings (Plug-fan).
Brushless type synchronous EC motor with integrated electronic commutated system and continuous variation of the rotation speed. The motor rotation control is obtained with the EC system (Electronic
Commutation) that manage the motor according to the 0÷10V proportional signal coming from the microprocessor control.
Maintenance-free bearings
IP54 enclosure class.
 

REFRIGERANT CIRCUIT
Components for each refrigerant circuit:
Thermostatic expansion valve up to model 85 P2 C3 D included.
Electronic expansion valve from model 107 P2 C3 D included.
The valve allows high performance and system efficiency thanks to a
timely and accurate response to changes in temperature and pressure. The electronic expansion valve exclude the installation of the electromagnetic valve on liquid line.
Sight glass.
Electromagnetic valve on liquid line. The electromagnetic valve is not installed when the electronic expansion valve is present.
Filter dryer on liquid line.
Service valves on liquid line and gas discharge.
Safety valve on low pressure side.
Pressure transducers with indication, control and protection functions, on low and high refrigerant 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.
R410A refrigerant charge.

ELECTRICAL PANEL
In accordance with EN60204-1 norms complete with:
Main switch with door lock safety.
Magnetothermic switch or fuses for each compressor.
Magnetothermic switches for fans or water pumps (if scheduled).
Contactors for each load.
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.

HYDRAULIC CONNECTIONS OF HEAT EXCHANGERS
The heat exchangers’ threaded hydraulic connections are available up to a diameter of 3 “ included, and correspond to ISO 228/1 – G M.
The pipes’ threaded hydraulic connections are available up to a diameter of 3 “ included, and correspond to ISO 7/1 – R.
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).