Daikin EWAD730T-XLB2 [79/81] Technical specifications

Daikin EWAD800T-SLB2 [79/81] Technical specifications
TECHNICAL SPECIFICATIONS
71/73
squirrel -cage induction type and cooled by suction gas.
The compressor shall be provided with a built in, high efficiency, mesh type oil separator and oil filter.
Refrigerant system differential pressure shall provide oil injection on all moving compressor parts to
correctly lubricate them. Electrical oil pump lubricating system is not acceptable.
The compressor’s oil cooling must be realized, when necessary, by refrigerant liquid injection. External
dedicated heat exchanger and additional piping to carry the oil from the compressor to heat exchanger
and viceversa will be not accepted.
The compressor shall be direct electrical driven, without gear transmission between the screw and the
electrical motor.
The compressor casing shall be provided with ports to realize economized refrigerant cycles.
The unit shall be provided with two thermal protection realized by a thermistor for high temperature
protection: one temperature sensor to protect electrical motor and another sensor to protect unit and
lubricating oil from high discharge gas temperature.
The compressor shall be equipped with an electric oil-crankcase heater.
Compressor shall be fully field serviceable. Compressor that must be removed and returned to the
factory for service shall be unacceptable. Cooling capacity control system The chiller will have a
microprocessor for the control of the compressor capacity through inverter in order to continuously
modulate the compressor’s rotational speed.
The unit capacity control shall be infinitely modulating between 100% and the minimum.
The system shall control the unit based on the leaving evaporator water temperature that shall be
controlled by PID (Proportional Integral Derivative) logic.
Evaporator
The units shall be equipped with a direct expansion shell & tube evaporator with copper tubes rolled into
steel tube sheets. 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.
Flow switch on evaporator available as option (shipped loose).
Water filter needs to be provided on the plant.
Condenser coil The condenser is made entirely of aluminum with flat tubes containing small channels.
Full - depth louvered aluminum fins are inserted between the tubes maximizing the heat
exchange. The Microchannel technology ensures the highest performance with the minimum surface for
the exchanger. The quantity of refrigerant is also reduced compared to Cu/Al condenser. Special
treatments ensure resistance to the corrosion by atmospheric agents extending the life time (available on
request).
Condenser fans The condenser fans used in conjunction with the condenser coils, shall be propeller
type with aluminum -magnesium alloy 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.

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