Daikin EWAT290B-SRA1 [60/62] Technical specifications
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Daikin EWAT290B-SRA1 [60/62] Technical specifications

Daikin EWAT370B-XRA2 [60/62] Technical specifications
60/62
INSTALLATIONS NOTES
TECHNICAL SPECIFICATIONS
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
thecorrosion 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 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.
Refrigerant circuit The unit shall have one or two independent refrigerant.
•
The circuit shall include as standard: electronic expansion device dived by unit’s microprocessor control,
liquid line shut-off valve, sight glass with moisture indicator, 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 unit 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.
The compressor shall be connected to unit’s metal base frame by rubber anti vibration 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 (according to the version). This enclosure shall be
realized with a light, corrosion resisting aluminum structure and metal panels. The compressor sound-proof
enclosure (available as option) 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.
The unit should be able to operate in Primary only system with two-ways valve on terminals with
Variable Primary Flow control strategy (available as option on request).
Master/Slave
The unit shell be able to operate in Master / Slave mode in order to be connected with another similar unit (up
to 4). The master unit shall manage the slave units connected in series on the hydraulic plant with the aim of
optimize the running hours of each compressor and to balance running hours and the load
between the units.
Electrical control panel
Power and control shall be located in the main panel that will be manufactured to ensure protection against
all weather conditions.
•
The electrical panel shall be IP54 and (when opening the doors) internally protected against possible
accidental contact with live parts.
•
The main panel shall be fitted with a main switch interlocked door that shuts off power supply when opening.
•
The power section will include compressors and fans starter devices.
Controller
The controller will be installed as standard and it will be used to modify unit set-points and check control
parameters.
•
A built-in display will shows chiller operating status plus temperatures and pressures of water, refrigerant
and air, programmable values, set-points.
•
A sophisticated software with predictive logic, will select the most energy efficient combination of
compressors, EEXV and condenser fans to keep stable operating conditions to maximize chiller energy
efficiency and reliability.
•
The controller will be able to protect critical components based on external signals received from the unit
itself (such as motor temperatures, refrigerant gas and oil pressures, correct phase sequence, pressure
switches and evaporator flow switch). The input coming from the high pressure switch cuts all digital output
from the controller in less than 50ms, this will be an additional safety for the equipment.
•
Fast program cycle (200ms) for a precise monitoring of the system.
•
Floating point calculations supported for increased accuracy in P/T conversions.

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