t-NEXT DF DX
T_tNEXTDFDX_0719_EN
10
MEHITS S.p.A.
DATA BOOK
COOLING SECTION
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DIRECT EXPANSION 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.
•
Frame in galvanized steel or peraluman.
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Condensate tray in peraluman with PVC flexible discharge pipe.
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Temperature sensor on air intake with control and regulation functions.
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Temperature sensor on air delivery with function of temperature display.
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Under floor water alarm through sensor to be placed on the floor.
COOLING SECTION
–
CHILLED WATER COIL
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Chilled water 4 rows cooling coil with copper tubes, aluminium fins and galvanized steel
frame.
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2-way motorized valve with 0÷10 VDC control actuator and emergency manual control.
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Temperature probe on water inlet.
•
Hydraulic pipes in copper with anticondensate insulation
REFRIGERANT CIRCUIT
The air conditioner is supplied with a minimum R410A refrigerant charge.
Components for each refrigerant circuit:
•
Electronic expansion valve. The valve allows high performance and system efficiency thanks
to a timely and accurate response to changes in temperature and pressure.
•
Sight glass.
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Filter dryer on liquid line.
•
Pressure transducers with indication, control and protection functions, on low and high
refrigerant pressure.
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High pressure safety switch with manual reset.
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Liquid receiver.
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Pressure relief valve on liquid receiver for models 041 P1, 045 P1, 075 P2, 082 P2,
092 P2, 102 P2, 117 P4, 146 P4.
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Refrigerant circuit with copper tubing with anticondensate insulation of the suction line.
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Lubricant oil charge.
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Valves on gas delivery and liquid return for coupling to remote air-cooled condenser.
•
0÷10V proportional signal to manage the condensing control system of the remote air-cooled
condenser.
•
Condensing control by continuous variation of remote condenser fan rotation speed for
operations with ambient temperature down to -20°C.
ELECTRICAL PANEL
In accordance with EN60204-1 norms, suitable for indoor installation, complete with:
•
Main switch with door lock safety on frontal panel.
•
Magnetothermic switches for each compressor.
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Magnetothermic switches for supply fans.
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Contactors for each load. The supply fans equipped with EC electric motor don’t require
contactors.
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Transformer for auxiliary circuit and microprocessor supply.
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Numbered wirings.
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Terminals:
OUTLETS
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Voltage free deviating contact for General Alarm 1-2
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Voltage free contact for supply fans status.
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Voltage free contact for smoke / fire sensor (the sensors are accessory)
INLETS
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External enabling.
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Power supply 400/3+N/50.
CONTROL SYSTEM
Microprocessor control system with graphic display for control and monitor of operating and alarms
status. The system includes:
•
Built-in clock for alarms date and time displaying and storing;
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Built-in memory for the storing of the intervened events (up to 200 events recorded);
•
Predisposition for additional connectivity board housing (MODBUS, LON,
BACNET MS/TP RS485, BACNET OVER IP). The electronic cards are optional accessories.
•
Main components hour-meter;
•
Non-
volatile “Flash” memory for data storage in case of power supply faulty;
•
Menu with protection password;
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Demand Limit function;
•
LAN connection (max 10 units).
