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General
The new chillers units have been designed to operate with HFC 410A refrigerant. Both compressors and heat exchangers (plate heat exchanger and coils) have been optimized for this refrigerant.
They consist of two independent refrigerant circuits, a tandem high effi ciency and low vibration level Scroll compressors on each circuit, a True Dual two-circuit plate heat exchanger and a ventilating unit comprising V-shape coils and quiet fans; each of them is located in an externally mounted nozzle profi le housing generating low sound level.
The EWFV units are available in 8 sizes, from size 140.4 to 310.4, with a nominal capacity range from 137 to 308 kW. The EWFVB units are available in 8 sizes, from size 140.4 to 300.4, with a nominal capacity range from 134 to 301 kW in cooling mode and from 150 to 336 kW in heating mode.

Reference standards
The following applies to all the sizes and versions of EWFV/EWFVB units :
- Machine Directive EEC 98/37 (EN 292/1, EN 292/2)
- Low Voltage Directive EEC 73/23 (EN 60204-1, EN 150.439-1)
- Electromagnetic Compatibility Directive EEC 89/336 as modified by Directive EEC 92/31 (EN 50081-1, EN 50082-2)
- Pressure Equipment Directive 97/23/CE

Cabinet and structure
The unit cabinet and structure are made of heavy gauge galvanized steel coated with polyester powder based painting (RAL 9001). All parts of the structure are fastened totally with non-corrosive screws and bolts.

Compressors
Each unit is equipped with four compressors arranged in two tandems to suit the two refrigerant circuits. The compressors are of hermetic scroll type and fi tted with an electronic control system ensuring protection against high temperature and excessive load. All compressors have direct-on-line starting and are mounted on rubber vibration isolators in order to minimize noise and vibration transmission.

Evaporator
Evaporator is of a Dual Circuit brazed stainless steel plate type heat exchanger. It is insulated with a 19 mm thick closed cell polyethylene foam material and is fi tted with a fi lm type electric heater on the external surface to prevent the unit from freezing at a low temperature (down to -18 °C) when the unit is off.
Water connections are of a Victaulic type : 21/2 on sizes 140.4 to 200.4 and 3 on sizes 250.4 to 300.4/310.4.

Condenser coils
The condenser coils are made of seamless copper tubes, arranged in staggered rows, mechanically expanded into corrugated aluminum fins.

Condenser fans
For each size, all versions keep the same number of fans.
Large diameter, direct drive axial type fans with asynchronous three-phase motors are used in all acoustic versions (IC, SI & SS) of EWFV/EWFVB SD units.
Special inverter fans with electronic brushless type motors are used in EWFV/EWFVB AEE, APV and ATA units.
On high pressure fans of APV units, the external static pressure (≤ 120 Pa) can be adjusted on site to match the customer demand directly from the electronic control panel of the unit.
Fans are equipped with externally mounted nozzle profi le housing which generates low sound levels.

Fan speed control
The speed of fans is controlled in order to operate at a low ambient temperature.
On units with standard axial fans, the fan speed control, supplied as standard, is of a temperature actuated step type (for IC and SI versions) and of a pressure actuated stepless type with an electronic controller (for SS version).
The pressure actuated stepless type fan speed controller can be supplied as optional on IC and SI versions. It allows the units to operate in cooling mode at ambient temperature down to -18 °C.
On AEE and APV units with electronic axial fans, the pressure actuated stepless type fan speed control is supplied as standard, because these electronic fans are already equipped with an integrated fan speed control (fan speed range : 50 to 1200 rpm; ambient temperature limit : -18 °C (in cooling mode only)).

Refrigerant circuits
All the units are composed of two independent and separate refrigerant circuits.
Each refrigerant circuit is equipped with liquid line and discharge
line shut-off valves, fi lter-drier with solid core, sight glass and electronic expansion valve (VEE).
The heat pump units are provided with 4-way reversing valves, suction accumulators and liquid receivers on the liquid lines.
The functional diagram of each circuit is shown in the section Refrigerant flow diagram.

Electrical board
Metal case, externally arranged at one end of the unit. Case for the board with IP54 protection rating, complete with grille for natural air ventilation of the box.

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