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EWAD270TZ-PR
Технические данные Страница: 73

Daikin EWAD270TZ-PR [73/75] Condenser fans

Daikin EWAD710TZ-SS [73/75] Condenser fans

TECHNICAL SPECIFICATIONS

Evaporator

(Single circuit unit)

The units shall be equipped with a direct expansion plate to plate type evaporator.

• The evaporator will be made of of stainless steel brazed plates and shall be linked with an electrical heater to prevent freezing down

to -28°C ambient temperature, controlled by a thermostat and shall be insulated with flexible, closed cell

polyurethane insulation material (20-mm thick).

• The evaporator will have 1 refrigerant circuit for each compressor.

• The water connections shall be VICTAULIC type connections as standard to ensure quick mechanical disconnection between the unit

and the hydronic network.

• The evaporator will be manufactured in accordance to PED approval.

• Flow switch will be standard factory mounted.

• Water filter will be standard.

(Dual Circuit units)

The units shall be equipped with a direct expansion shell&tube evaporator with copper tubes rolled into steel tubesheets. The

evaporator shall be single-pass on both the refrigerant and water sides for pure counter-flow heat exchange and low refrigerant

pressure drops.

• The external shell shall be linked with an electrical heater to prevent freezing down to -28°C ambient temperature, controlled by a

thermostat and shall be insulated with flexible, closed cell polyurethane insulation material (20-mm thick).

• The evaporator will have 2 circuits, one for each compressor and shall be single refrigerant pass.

• The water connections shall be VICTAULIC type connections as standard to ensure quick mechanical disconnection between the unit

and the hydronic network.

• The evaporator will be manufactured in accordance to PED approval.

Condenser coil The unit shall be equipped with condenser coils constructed with internally finned seamless copper tubes and

arranged in a staggered row pattern and mechanically expanded into lanced and rippled aluminum fins with full fin collars for higher

efficiencies. The space between the fins is given by a collar that will increase the surface area in connection with the tubes, protecting

them from ambient corrosion.

• The condenser coils will have an integral subcooler circuit that provides sufficient subcooling to effectively eliminate the possibility of

liquid flashing and increase the unit's efficiency with 5% to 7% without increasing in energy consumption.

• The condenser coils shall be leak-tested and submitted to a pressure test with dry air.

Condenser fans The condenser fans used in conjunction with the condenser coils, shall be propeller type with glass reinforced

resin blades for higher efficiencies and lower sound. Each fan shall be protected by a fan guard.

• The air discharge shall be vertical and each fan must be coupled to the electrical motor, supplied as standard to IP54 and capable to

work to ambient temperatures of - 20°C to + 65°C.

• The condenser fans shall have as a standard a thermally protection by internal thermal motor protection and protected by circuit

breaker installed inside the electrical panel as a standard.

Refrigerant circuit The unit shall have one or two independent refrigerant circuits and one variable electrical frequency driver

per compressor (Inverter).

• The circuit shall include as standard: electronic expansion device piloted by unit’s microprocessor control, compressor suction and

discharge shut-off valves, liquid line shut-off valve, sight glass with moisture indicator, replaceable filter drier, charging valves, high

pressure switch, high and low pressure transducers, oil pressure transducer and insulated suction line.

Condensation control The units will be provided with an automatic control for condensing pressure which ensures the working

at low external temperatures down to - …………… °C, to maintain condensing pressure.

• The compressor automatically unloads when abnormal high condensing pressure is detected. This to prevent the shutdown of the

refrigerant circuit (shutdown of the unit) due to a high-pressure fault.

Reduced Sound unit configurations (on request) The unit compressor shall be connected with unit’s metal base

frame by rubber antivibration supports to prevent the transmission of vibrations to all metal unit structure, in order to limit the unit

noise emissions.

The chiller shall be provided with an acoustical compressor enclosure. This enclosure shall be realized with a light, corrosion resisting

aluminum structure and metal panels. The compressor sound-proof enclosure shall be internally fitted with flexible, multi-layer, high

density materials.

Hydronic kit options (on request) The hydronic module shall be integrated in the chiller chassis without increasing its

dimensions and includes the following elements: centrifugal pump with motor protected by a circuit breaker installed in control panel,

water filling system with pressure gauge, safety valve, drain valve.

• The hydronic module shall be assembled and wired to the control panel.

• The water piping shall be protected against corrosion and freezing and insulated to prevent condensation.

• A choice of two pump types shall be available:

- in-line single pump

- in-line twin pumps.

Page 73 of 75

Daikin EWAD270TZ-PR [73/75] Condenser fans

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