Daikin EWAD380T-XSB2 [6/81] Control section main features
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Daikin EWAD380T-XSB2 [6/81] Control section main features

Daikin EWADC17T-XRB3 [6/81] Control section main features
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GENERAL CHARACTERISTICS
Electronic expansion valve The unit is equipped with the most advanced electronic expansion
valve 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 possesses 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.
Refrigerant circuit Each unit has 2 independent refrigerant circuits and each one includes:
• Compressor with integrated oil separator
• Refrigerant
• Evaporator
• Air Cooled Condenser
• Electronic expansion valve
• Discharge line shut off valve
• Liquid line shut off valve
• Sight glass with moisture indicator
• Filter drier
• Charging valves
• High pressure switch
• High pressure transducers
• Low pressure transducers
• Oil pressure transducer
• Suction temperature sensor
Electrical control panel Power and control are located in the main panel that is manufactured to ensure
protection against all weather conditions. The electrical panel is IP54 and (when opening the doors)
internally protected against possible accidental contact with live parts. The main panel is fitted with a
main switch interlocked door that shuts off power supply when opening.
Power Section The power section includes compressors and fans protection devices, fans starters and
control circuit power supply.
MicroTech III controller MicroTech III 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 and air, programmable values, set-points. A
sophisticated software with predictive logic, selects the most energy efficient combination of
compressors, EEXV and condenser fans to keep stable operating conditions to maximize chiller energy
efficiency and reliability. MicroTech III is able to protect critical components based on external signals
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.
Control section - main features
Main control features are (for more information refer to Unit Control Manual):
• Optimized management of compressors stepless capacity control through inverter drive.
• Display of evaporator entering/leaving water temperatures.

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