Daikin EWWDC12EJYNN [9/23] Features

General characteristics

screw rotor load in both the radial and axial directions. Inherent to the basic single-screw compressor design is the

virtually load-free operation, that gives main bearing design life of 3-4 times greater than twin-screws, and

eliminates expensive and complicated thrust balancing schemes. The two exactly opposed gaterotors create two

exactly opposed compression cycles. Compression is made at the lower and upper parts of the screw rotor at the

same time, thus cancelling the radial loads. Also, both ends of the screw rotor are subjected to suction pressure

only, which cancels the axial loads and eliminates the huge thrust loads inherent in twin-screw compressors.

Oil injection is used for these compressors in order to get high COP at high condensing pressure. EWWD-EJ units

are provided with an high efficiency oil separator to maximise oil extraction.

Compressors have a infinitely variable capacity control down to 25% of its total capacity. This control is made by

The copper tubes are roll expanded into carbon steel tube plates.

Condensers

Condensers are shell and cleanable, through-tube type. The unit has indenpendent condensers, one per circuit.

Each condenser has a carbon steel and seamless, integrally finned high efficiency copper tubes, roll expanded

into heavy carbon steel tube sheets. Water heads are removable and include vent and drain plugs. Condensers

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

Note: The units are furnished with 1 pass

condensers as standard (water entering a side and water leaving

the opposide side of the heat exchanger).

Electronic expansion valve

The EWWD-EJ water cooled chiller is equipped with the most advanced electronic expansion valve to achieve

precise control of refrigerant mass flow. As today’s system requires improved energy efficiency, tighter

temperature control, wider range of operating conditions and incorporate new features like remote monitoring and

diagnostics, the application of electronic expansion valves becomes mandatory. EWWD-EJ’s electronic expansion

valve proposes features that makes it unique: short opening and closing time, high resolution, positive shut-off

function to eliminate use of additional solenoid valve, highly linear flow capacity, continous modulation of mass

flow without stress in the refrigerant circuit and corrosion resistance stainless steel body.

Power section includes - The power section includes contactors, all compressors fuses, and control circuit

transformer. Additional space is provided for an easy installation of the various optional accessories provided to

enhance the EWWD-EJ units capabilities.