ENERTEL...... DL ..... R134a ..... 6,7 ÷ 15,5 kW

MAIN FEATURES
Telecommunication packaged air conditioners.
Proportional automatic free-cooling system. Three working mode.
22 models, 3 versions available for a wide selection opportunity.
Average step of 1,5kW.
Scroll compressor.
R407c refrigerant charge, over version.
R134a refrigerant charge, Under version and DL version.
Supply centrifugal fans directly coupled to the electric motors.
Upflow air delivery (Over version), Downflow air delivery (Under version), Displacement air delivery (DL version).
Double power supply (Network + 48vDC UPS)
Suitable for indoor installation.
 

DOUBLE POWER SUPPLY
(Network + 48vDC UPC)

WORKING LIMITS
Room humidity from 20 up to 75% rH Room temperature from 16 up to 35°C Ambient temperature from -30 up to 45°C
 

MAIN BENEFITS
The proprietary software foresees unit working with the lowest noise emission during the night.
Working continuity even during black-out periods.
Automatic restart of the unit.
Availability of electric heater.
Full frontal inspection.
Easily of maintenance.

PROPORTIONAL FREE-COOLING SYSTEM.
The cooling system is totally proportional and allows three working modes:
total free-cooling: only fresh air is used to cool the ambient;
partial free-cooling: the fresh air is used for a pre-cooling and the compressor or the chilled water are used to balance the load;
mechanical cooling: the compressor or the chilled water are used to cool the ambient
 
MAIN COMPONENTS

FRAMEWORK
Galvanized steel sheet base externally painted with epoxy powders.
Housing consisting of aluminium profile frame, jointed with reinforced PVC corners and galvanized steel sheet panels externally coated with PVC film.
Panels internally insulated by noise absorption material fixed by special PVC gasket, granting also the panels air tightness. The panels are fixed by stainless steel screws contained in a small cage not projecting from the housing.
Total front access for routine maintenance.

ON / OFF COMPRESSOR
Scroll compressor.
Electric motor with direct on line starting.
Rubber supports.

FILTER SECTION
Washable air filters with G3 efficiency, with cells in synthetic fibre and metallic frame (EN 779-2002).

EVAPORATING SECTION
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.
Condensate tray in peraluman with PVC flexible discharge pipe.

SUPPLY FANS SECTION
Power supply 48vDC from UPS ENERTEL o (over)
Double suction centrifugal fans with forward curved vanes directly coupled to external rotor electric motor. FoR ALL SERiES
Brushless type electric motor with continuous variation of the rotation speed. The motor rotation control is obtained by signal coming from the microprocessor control.
Temperature sensor on room air intake
Temperature sensor on room air delivery.
Grille on room air suction.
System for air flow loss alarm
Air delivery:
ENERTEL DL: Displacement air delivery

REFRIGERANT CIRCUIT
Thermostatic expansion valve.
Sight glass.
Filter dryer on liquid line.
Pressure transducer with indication, control and protection functions, on high pressure.
Low pressure safety switch.
Refrigerant circuit with copper tubing with anticondensate insulation of the suction line.
ENERTEL DL (Displacement)
R134a refrigerant charge and lubricant oil.
 

CONDENSING COIL
Heat exchanger 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.
Grille on air suction/discharge.

CONDENSER FANS SECTION
Double suction centrifugal fans with forward curved vanes directly coupled to external rotor electric motor.
External rotor AC type electric motor with stepless variable speed for
condensing pressure control.

DIRECT FREE-COOLING SECTION
Power supply 48vDC from UPS
Deviating damper on ambient air.
Proportional servomotor directly driven by microprocessor control.
Grille on ambient air suction.
Temperature sensor on ambient air.

ELECTRICAL PANEL
in accordance with EN60204-1 norms, suitable for outdoor installation, complete with:
Double power supply, from network and from UPS 48VDC Units size S1:
230/1/50 power supply for compressor, condenser fan and eventual electric
heater. Units size S2, S3:
400/3/50+N power supply for compressor, condenser fan and eventual electric heater.
For all units:
48 vDC power supply from UPS for supply fans, free-cooling damper servomotor, auxiliary circuit and microprocessor control.
Magnetothermic switch for 230/1/50 or 400/3/50+N power supply line (from
network)
Magnetothermic switch for 48VDC power supply line (from UPS)
Contactor on compressor.
Phases monitoring relay (only S2, S3 units)
Auxiliary circuit 48VDC (from UPS).
Terminals for General Alarm 1
Terminals for General Alarm 2

CONTROL SYSTEM
Power supply 48vDC from UPS
Microprocessor system with graphic display for control and monitor of operating and alarms status. The system includes:
Real time clock.
Main components hour-meter.
Menu with protection password.
LAN connection.
LN function to obtain a low noise unit running. The system works proportionally to the load on the fan rotation speed either of the condenser fan or the supply fan. The system allows a low noise unit running during night time anyway according to the programmed sets.
Automatic restart of the unit in case of power failure