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EWWDC11BJYNN
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Daikin EWWDC11BJYNN [8/21] Specifications

Daikin EWWD550BJYNN [8/21] Specifications

• Chillers • R-134A • EWWD-BJYNN

• Hydronic Systems • Chillers

3 Specifications

To supply and install, where specified in the project n ..... unit(s) water cooled chiller with cooling capacity of ..... kW, to cool ..... l/sec. of water from .....

°C to ....., condenser entering water temperature ….°C, condenser leaving water temperature ….°C. The unit should work with electricity at ..... V, 3ph,

50Hz. The electrical power absorbed should not exceed ..... kW. The units COP will be at least ..... at the working conditions of the project. Part load

COP will be at least ..... at the working conditions of the project. For the units with 1 or 2 compressors the chillers will have only one refrigerant circuit,

and the electronic microprocessor will allow the starting of the compressors. Each chiller will be factory assembled on a robust baseframe. The unit will

be tested at full load in the factory at the nominal working conditions and water temperatures. Before shipment a full test will be held to avoid any losses,

and the units will be filled with oil and refrigerant.

REFRIGERANT

Only R-134a will be accepted.

NOISE LEVEL AND VIBRATIONS

Sound pressure level at 1 meter distance in free field shall not exceed ………dBA

Vibration level should not exceed 2 mm/s.

Units will have the following components:

COMPRESSORS

The compressor should be single screw type with one main screw rotor that meshes with two diametrically opposed gaterotors. The two exactly opposed

gaterotors create two exactly opposed compression cycles which results in balanced forces acting on the compressor. The gaterotors should be

constructed of a carbon impregnated engineered composite material. The gaterotor supports will be constructed of cast iron. The semi-hermetic

compressor should be gas-cooled.

Oil injection shall be used for this compressor in order to get high COP at high condensing pressure. The unit should be provided with an oil separator

and it will be the high efficiency, augmented gas impingement type to maximise oil extraction.

EVAPORATOR

The units will be supplied with shell-and-tube flooded type evaporator (refrigerant flow in the shell and water flow in tubes). Replaceable tubes will be

fabricated from integral finned copper and mechanically bonded to steel tube sheet. Refrigerant side will be PED designed, constructed, inspected and

stamped. Water side working pressure should be designed for 10,5 bar. Vessels will include spring loaded pressure relief valves. Shell and non-

connection water heads will be insulated with 3/4 ” thick closed cell insulation.

CONDENSER

Condenser will be shell-and-tube type operating with refrigerant in shell and water in tubes. Replaceable water tubes should be fabricated from integral

finned copper and mechanically bonded to steel tube sheets. Condenser will be designed to conform PED. Water side working pressure should be

designed for 10.5 bar.

SERVO CONTROLLED MODULATING LIQUID LEVEL REGULATORS

The refrigerant circuit will be equipped with a modulating servo-controlled main expansion valve type controlled by a pilot float valve type to perfectly

modulate refrigerant flow to the evaporator, proportionally to the required capacity. This will ensure a stable regulation and economic operation, because

pressure and temperature variations will be strongly reduced.

MODULATING CONDENSER WATER FLOW VALVE

It is factory mounted on condenser outlet water connection, in order to allow fast and safe unit starting. It is not supplied for condensers with water side

pressures higher than 10 bar.

CONTROL PANEL

Field power connection, control interlock terminals, and unit control system should be centrally located in an electric panel (IP43). Power and starting

controls should be separate from safety and operating controls in different compartments of the same panel. Starting will be star/delta type. Power and

starting controls should include fuses and contactors for each compressor winding. Operating and safety controls should include energy saving control;

emergency stop switch; overload protection for compressor motor; high and low pressure cut-out switch; compressor lead-lag switch (on 2 compressor

units only); cut-out switch for each compressor.

All of the information regarding the unit will be reported on a display and with the internal built-in calender and clock that will switch the unit ON/OFF

during day time all year long.

REGULATION OF COOLING CAPACITY

Each unit will have a microprocessor for the control and operation of the unit that should have a infinitely variable capacity control down to 12,5% (two

compressors) or to 25% (one compressor) of the cooling capacity.

REFRIGERANT PIPING

Refrigerant circuit should include a factory insulated suction line, manual liquid line shut-off valve with charging connection, refrigerant filter drier with

replaceable core, sensor indicator, servo controlled liquid regulator and relief valve.

Daikin EWWDC11BJYNN [8/21] Specifications

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