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EWWDC12EJYNN
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Daikin EWWDC12EJYNN [8/23] Features

• Applied Systems • Chillers

• Chillers • R-134A • EWWD-EJYNN/A

3 Features

Technical 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, 2, 3 compressors the chillers will have (1),

(2), (3) independent refrigerant circuits, and the respective 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 one direct expansion evaporator with refrigerant inside the tubes and

water outside (shell side) with carbon steel tube sheets, with straight copper tubes that are spirally wound internally

for higher efficiencies, expanded on the tube plates. The external shell will be covered with a closed cell insulation

material. Each evaporator will have 1, 2 or 3 refrigerant circuits one for each compressor. Each evaporator is

manufactured in accordance to PED approval.

Condensers - Condensers will be shell and cleanable, through-tube type. The unit will have one condensers per

circuit. Each condenser shall have a carbon steel and seamless, integrally finned high efficiency copper tubes, roll

expanded into heavy carbon steel tube sheets. Water heads shall be removable and include vent and drain plugs.

Condensers will come complete with liquid shut-off valve, spring loaded relief valve.

Electronic expansion valve - Each refrigerant circuit will be equipped with all the necessary components in order to

ensure the workings and service (dehydration filter, liquid sight glass, shut-off valve, load connection, pressure switch

etc.) and an electronic expansion valve that allows a simple control system that quickly interacts at load variations.

This valve combines two functions: liquid solenoid and electronic expansion valve. It is managed directly by a

microprocessor.

Control panel - Field power connection, control interlock terminals, and unit control system should be centrally

located in an electric panel (IP 54). 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 (for each refrigerant circuit); anti-freeze thermostat; compressor lead-lag switch (on 2 compressor units

only); cut-out switch for each compressor; operating hour meter (for each compressor).

All of the information regarding the unit will be reported on a display and with the internal built-in calendar 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 8,3% (three compressors), to 12,5% (two compressors), 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, electronic expansion

valve and relief valve.

Daikin EWWDC12EJYNN [8/23] Features

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