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EWAD465TZ-SS
Технические данные Страница: 4

Daikin EWAD465TZ-SS [4/75] Compressor

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.

Compressor New technology semi-hermetic, single-screw

type with gate-rotor made with the latest high-strength fiber

reinforced star material.

Each compressor has one inverter managed by the unit

microprocessor for infinitely modulating the capacity.

Main features:

• Inverter integrated to the compressor body, resulting in

compact design and no need of additional components in the

electrical panel.

• Refrigerant cooled Inverter.

• Variable Volume Ratio (VVR) for a complete compressor

efficiency optimization.

• Larger compressor discharge and suction ports to minimize

refrigerant pressure drops.

• Electric motors optimized for highest efficiencies at all

operating conditions.

• Integrated high efficiency oil separator maximizes the oil

separation

Refrigerant The compressors have been designed to operate with R-134a, ecological refrigerant with zero ODP (Ozone Depletion

Potential) and very low GWP (Global Warming Potential), resulting in low TEWI (Total Equivalent Warming Impact).

Evaporator

SINGLE CIRUIT MODELS (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 exchanger is equipped with an electric heater for protection against

freezing down to –28°C and evaporator water connections are provided with victaulic kit (as standard). The evaporator has 1 circuit

(one compressor) and is manufactured in accordance to 97/23/EC directive (PED). Flow switch on evaporator standard factory

mounted. Water filter is standard.

DUAL CIRUIT MODELS (Shell&Tube)

The unit is equipped with a direct expansion shell&tube evaporator with refrigerant evaporating inside the tubes and water flowing

outside. The tubes are enhanced for maximum heat transfer and rolled into steel tube sheet and sealed.

The evaporators are single-pass on both the refrigerant and water sides for pure counter-flow heat exchange and low refrigerant

pressure drops. Both characteristics contribute to the heat exchanger effectiveness and total unit’s outstanding efficiency. The water

side is designed for 10 bar of maximum operating pressure and is provided with vents and drain.

The external shell is covered with a 10mm closed cell insulation material and the evaporator water connections are provided with

victaulic kit (as standard). Each evaporator has 2 circuits, one for each compressor and is manufactured in accordance to 97/23/EC

directive (PED).

Condenser The condenser is manufactured with internally enhanced seamless copper tubes arranged in a staggered row pattern

and mechanically expanded into lanced and rippled aluminum condenser fins with full fin collars. An integral sub-cooler circuit provides

sub-cooling to effectively eliminate liquid flashing and increase cooling capacity without increasing the power input.

Condenser fans

SILVER: The ON/OFF condenser fans are propeller type with high efficiency design blades to maximize performances. The material of

the blades is glass reinforced resin and each fan is protected by a guard. Fan motors are protected by circuit breakers installed inside

the electrical panel as a standard. The motors are IP54 and are suitable for use with inverters (optionals).

GOLD: The Inverter Driven (AC inverter type) condenser fans are propeller type with high efficiency design blades to maximize

performances. The material of the blades is glass reinforced resin and each fan is protected by a guard. Fan motors are protected by

circuit breakers installed inside the electrical panel as a standard. The motors are IP54.

PLATINUM: The condenser fans are “brushless” (EC) type and are made with synchronous motors excited by permanent magnets and

with phase currents controlled by a PWM inverter integrated in the fan motor housing, that allows operation at different speeds. With

this technology the fans reach high efficiencies with an extremely low noise level across a very wide speed range. The motors are IP54.

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 (winter time) without any refrigerant flow

problems and with a perfect chilled water leaving temperature control.

Page 4 of 75

Daikin EWAD465TZ-SS [4/75] Compressor

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