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EWWQ480L-SS
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Daikin EWWQ480L-SS [4/41] General characteristics

GENERAL CHARACTERISTICS

Cabinet and structure The cabinet is made of galvanized steel sheet and painted to provide a high resistance to corrosion.

Colour Ivory White (Munsell code 5Y7.5/1) (±RAL7044).The base frame has an eye-hook to lift the unit with ropes for an easy

installation. The weight is uniformly distributed along the profiles of the base and this facilitates the arrangement of the unit.

Refrigerant Units have been optimized to operate with R-410A, refrigerant with zero ODP (Ozone Depletion Potential) and GWP

(Global Warming Potential) 1890. R-410A has been the logical choice for our multiple scroll chiller because today it is one of the most

promising refrigerants in terms of efficiency, stability and environmental impact. R-410A offers a small swept volume, a good heat

exchange capacity and leads to reduced component sizes of items such as heat exchangers and tubing.

Compressor The compressor is hermetic orbiting scroll compressor complete with motor over-temperature and over-current

devices. An oil heater, which starts automatically, keeps the oil from being diluted by the refrigerant when the compressor stops. The

compressors are connected in Tandem on a single refrigerating circuit and are fitted on rubber antivibration mounts and complete with

oil charge.

Evaporator (Plate Heat Exchanger) The unit is equipped with a direct expansion plate to plate type evaporator. This heat

exchanger is made of stainless steel brazed plates and is covered with a 20mm closed cell insulation material. The evaporator is

manufactured in accordance to PED approval. Flow switch and victaulic kit are provided mounted as option.

Condenser (Plate Heat Exchanger) The unit is equipped with a direct expansion plate to plate type condenser. This heat

exchanger is made of stainless steel brazed plates and is covered with a 20mm closed cell insulation material (mounted as option). The

condenser is manufactured in accordance to PED approval. Flow switch and victaulic kit are provided mounted as option.

Electronic expansion valve The unit is equipped with the most advanced electronic expansion valves 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 features like remote monitoring and diagnostics, the application of electronic expansion valves

becomes mandatory.

Electronic expansion valves possess unique features: short opening and closing time, high resolution, positive shut-off function to

eliminate use of additional solenoid valve, continuous modulation of mass flow without stress in the refrigerant circuit and corrosion

resistance stainless steel body.

Electronic expansion valves are typically working with lower ΔP between high and low pressure side, than a thermostatic expansion

valve. The electronic expansion valve allows the system to work with low condenser pressure without any refrigerant flow problems and

with a perfect chilled water leaving temperature control.

Refrigerant circuit Each unit has 1 or 2 refrigerant circuit, according to the capacity, that includes:

• Compressors

• Refrigerant

• Evaporator

• Condenser

• Electronic expansion valve

• Liquid line shut off valve

• Filter drier

• Sight glass with moisture indicator

• High pressure switch

• High pressure transducers

• Low pressure transducers

• Suction temperature sensor

Electrical control panel Power and control are located in the main panel. The electrical panel is IP54 and (when opening the

doors) internally protected with plexiglass panel against possible accidental contact with electrical components (IP20). The main panel

is fitted with a main switch interlocked door.

Power Section

The power section includes compressors protection devices, compressors starters and control circuit power supply.

Unit controller

Unit controller is installed as standard; it can be used to modify unit set-points and check control parameters. A built-

in display shows chiller operating status plus temperatures and pressures of water, refrigerant, programmable values,

set-points. A sophisticated software with predictive logic, selects the most energy efficient combination of

compressors and EEXV to keep stable operating conditions to maximise chiller energy efficiency and reliability.

The unit controller is able to protect critical components based on external signs from its system (such as motor

temperatures, refrigerant gas and oil pressures, correct phase sequence, pressure switches and evaporator). The

input coming from the high pressure switch cuts all digital output from the controller in less than 50ms, this is an

additional security for the equipment.

Fast program cycle (200ms) for a precise monitoring of the system. Floating point calculations supported for

increased accuracy in Pressure / Temperature conversions.

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Daikin EWWQ480L-SS [4/41] General characteristics

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